Acronyms: RIP (Route Information Protocol), OSPF (Open Shortest Path First), ISIS (Intermediate System-to-Intermediate System intra-domain routing information exchange protocol), BGP (Border Gateway Protocol)

Chapter 1 Routing Overview

1.1 Overview

1.1.1 Static Routing and Routing Protocols

I. Static routing

Static routing features zero overhead, simple configuration, and is applicable to simple and stable networks. But it requires human intervention when the network topology changes.

II. RIP

RIP is easy to configure and is insensitive to CPU and memory, so it is applicable to small and medium sized networks. However, it converges slowly and cannot eliminate route loops completely. In addition, periodic RIP updating multicasts or broadcasts consume many network resources.

III. OSPF

OSPF is complicated to configure and requires high-performance CPU and memory. It is applicable to medium and large sized networks. OSPF converges fast and can eliminate route loops completely. It supports area partition and provides hierarchical route management.

IV. IS-IS

IS-IS is complicated to configure and requires high-performance CPU and memory. It is applicable to medium and large networks. ISIS converges fast and can eliminate route loops completely. It supports area partition and provides hierarchical route management.

V. BGP

BGP runs between ASs. Although complicated to configure, BGP features high reliability, stability, and scalability, has flexible and powerful routing policies and eliminates route loops completely.

1.1.2 Routing Protocols Supported by the H3C Low-End Ethernet Switches

The S7500 series switches support RIP, OSPF, IS-IS and BGP.

1.2 Configuration Guide

& Note:

l This configuration guide takes S7500 series Ethernet switches as an example.

l For configuration precautions, see corresponding operation manuals and command manuals.

1.2.1 Configuration Task List

Table 1-1 Configuration task List

Task	Details
Static route configuration	1.2.2
RIP configuration	1.2.3
OSPF configuration	1.2.4
ISIS Configuration	1.2.5
BGP configuration	1.2.6
Route Policy Configuration	1.2.7

1.2.2 Static Route Configuration

Table 1-2 Configure a static route

Operation	Command	Remarks
Enter system view	system-view	—
Configure a static route	ip route-static ip-address { mask \| mask-length } { interface-type interface-number \| next-hop } [ preference preference-value ] [ reject \| blackhole ]	Required By default, the system can obtain the route to the subnet directly connected to the router.

Operation

Command

Remarks

Enter system view

system-view

—

Configure a static route

ip route-static ip-address { mask | mask-length } { interface-type interface-number | next-hop } [ preference preference-value ] [ reject | blackhole ]

Required

By default, the system can obtain the route to the subnet directly connected to the router.

1.2.3 RIP Configuration

Table 1-3 RIP configuration task list

Configuration task		Remarks
Configuring basic RIP functions	Enabling RIP on an Interface	Required
	Setting the RIP operating status on an interface	Optional
	Specifying the RIP version on an interface	Optional
Configuring RIP route control	Setting the additional routing metrics of an interface	Optional
	Configuring RIP route summarization	Optional
	Disabling the router from receiving host routes	Optional
	Configuring RIP to filter incoming/outgoing routes	Optional
	Setting RIP preference	Optional
	Enabling load sharing among RIP interfaces	Optional
	Configuring RIP to redistribute routes from another protocol	Optional
Adjusting and optimizing a RIP network	Configuring RIP timers	Optional
	Configuring split horizon	Optional
	Configuring RIP-1 packet zero field check	Optional
	Setting RIP-2 packet authentication mode	Optional
	Configuring RIP to unicast RIP packets	Optional

I. Enabling RIP on an Interface

Table 1-4 Enable RIP on an interface

Operation	Command	Remarks
Enter system view	system-view	—
Enable RIP and enter RIP view	rip	Required
Enable RIP on the specified interface	network network-address	Required Disabled by default.

II. Setting the RIP operating status on an interface

Table 1-5 Set the RIP operating status on an interface

Operation	Command	Remarks
Enter system view	system-view	—
Enter interface view	interface interface-type interface-number	—
Enable the interface to receive RIP update packets	rip input	Optional By default, all interfaces are allowed to send and receive RIP update packets.
Enable the interface to send RIP update packets	rip output
Enable the interface to receive and send RIP update packets	rip work

III. Specifying the RIP version on an interface

Table 1-6 Specify the RIP version on an interface

Operation	Command	Remarks
Enter system view	system-view	—
Enter interface view	interface interface-type interface-number	—
Specify the version of the RIP running on the interface	rip version { 1 \| 2 [ broadcast \| multicast ] }	Optional By default, the version of the RIP running on an interface is RIP-1.

IV. Setting the additional routing metrics of an interface

Additional metric is the metric added to the original metrics of RIP routes on an interface. It does not directly change the metric value of a RIP route in the routing table of a router, but will be added to incoming or outgoing RIP routes on the interface.

Table 1-7 Set additional routing metric

Operation	Command	Remarks
Enter system view	system-view	—
Enter interface view	interface interface-type interface-number	—
Set the additional routing metric to be added for incoming RIP routes on this interface	rip metricin value	Optional By default, the additional routing metric added for incoming routes on an interface is 0.
Set the additional routing metric to be added for outgoing RIP routes on this interface	rip metricout value	Optional By default, the additional routing metric added for outgoing routes on an interface is 1.

V. Configuring RIP route summarization

Table 1-8 Configure RIP route summarization

Operation	Command	Remarks
Enter system view	system-view	—
Enter RIP view	rip	—
Enable RIP-2 automatic route summarization	summary	Required By default, RIP-2 automatic route summarization is enabled.

VI. Disabling the router from receiving host routes

Table 1-9 Disable the router from receiving host routes

Operation	Command	Remarks
Enter system view	system-view	—
Enter RIP view	rip	—
Disable the router from receiving host routes	undo host-route	Required By default, the router receives host routes.

VII. Configuring RIP to filter incoming/outgoing routes

Table 1-10 Configure RIP to filter incoming/outgoing routes

Operation	Command	Remarks
Enter system view	system-view	—
Enter RIP view	rip	—
Configure RIP to filter incoming routes	filter-policy { acl-number \| ip-prefix ip-prefix-name [ gateway ip-prefix-name ] \| gateway ip-prefix-name } import [ interface interface-type interface-number ]	Required By default, RIP does not filter any incoming route. The gateway keyword is used to filter the incoming routes advertised from a specified address.
Configure RIP to filter incoming routes	filter-policy gateway ip-prefix-name import
Configure RIP to filter outgoing routes	filter-policy { acl-number \| ip-prefix ip-prefix-name } export [ protocol [ process-id ] \| interface interface-type interface-number ]	Required By default, RIP does not filter any outgoing route.
Configure RIP to filter outgoing routes	filter-policy route-policy route-policy-name export

VIII. Setting RIP preference

Table 1-11 Set RIP preference

Operation	Command	Remarks
Enter system view	system-view	—
Enter RIP view	rip	—
Set the RIP preference	preference value	Required The default RIP preference is 100.

IX. Enabling load sharing among RIP interfaces

Table 1-12 Enable load sharing among RIP interfaces

Operation	Command	Remarks
Enter system view	system-view	—
Enter RIP view	rip	—
Enable load sharing among RIP interfaces	traffic-share-across-interface	Required By default, load sharing among RIP interfaces is disabled

X. Configuring RIP to redistribute routes from another protocol

Table 1-13 Configure RIP to import routes from another protocol

Operation	Command	Remarks
Enter system view	system-view	—
Enter RIP view	rip	—
Configure a default cost for an incoming route	default cost value	Optional 1 by default.
Configure RIP to redistribute routes from another protocol	import-route protocol [ process-id \| allow-ibgp ] [ cost value \| route-policy route-policy-name ]*	Required By default, RIP does redistribute any route from other protocols.

XI. Configuring RIP timers

Table 1-14 Configure RIP timers

Operation	Command	Remarks
Enter system view	system-view	—
Enter RIP view	rip	—
Set the RIP timers	timers { update update-timer \| timeout timeout-timer } *	Required By default, the Update timer is set 30 seconds and the Timeout timer to 180 seconds.

XII. Configuring split horizon

Table 1-15 Configure split horizon

Operation	Command	Remarks
Enter system view	system-view	—
Enter interface view	interface interface-type interface-number	—
Enable split horizon	rip split-horizon	Required Enabled by default.

XIII. Configuring RIP-1 packet zero field check

Table 1-16 Configure RIP-1 packet zero field check

Operation	Command	Remarks
Enter system view	system-view	—
Enter RIP view	rip	—
Enable the check of the “must be zero” field in RIP-1 packets	checkzero	Required Enabled by default.

XIV. Setting RIP-2 packet authentication mode

Table 1-17 Set RIP-2 packet authentication mode

Operation	Command	Remarks
Enter system view	system-view	—
Enter interface view	interface interface-type interface-number	—
Set RIP-2 packet authentication mode	rip authentication-mode { simple password \| md5 { rfc2453 key-string \| rfc2082 key-string key-id } }	Required If you specify to use MD5 authentication, you must specify one of the following MD5 authentication types: l rfc2453 (this type supports the packet format defined in RFC 2453) l rfc2082 (this type supports the packet format defined in RFC 2082)

XV. Configuring RIP to unicast RIP packets

Table 1-18 Configure RIP to unicast RIP packets

Operation	Command	Remarks
Enter system view	system-view	—
Enter RIP view	rip	—
Configure RIP to unicast RIP packets	peer ip-address	Required When RIP runs on the link that does not support broadcast or multicast, you must configure RIP to unicast RIP packets.

1.2.4 OSPF Configuration

Table 1-19 OSPF configuration task list

Configuration task		Remarks
Basic OSPF configuration		Required
Configuring OSPF Area Attributes		Optional
OSPF Network Types	Configuring the Network Type of an OSPF Interface	Optional
	Configuring an NBMA/P2MP Neighbor	Optional
	Configuring the DR Priority on an OSPF Interface	Optional
OSPF route control	Configuring OSPF Route Summarization	Optional
	Configuring OSPF to Filter Received Routes	Optional
	Configuring the OSPF Cost on an Interface	Optional
	Configuring OSPF Route Priority	Optional
	Configuring OSPF to Redistribute Routes	Optional
OSPF network adjustment and optimization	Configuring OSPF Timers	Optional
	Configure the LSA transmission delay	Optional
	Configuring the SPF Calculation Interval	Optional
	Disabling OSPF Packet Transmission on an Interface	Optional
	Configuring OSPF Authentication	Optional
	Configuring the MTU Field in DD Packets	Optional
	Configuring OSPF Network Management	Optional

I. Basic OSPF configuration

Table 1-20 Basic OSPF configuration

Operation	Command	Remarks
Enter system view	system-view	—
Disable multicast MAC addressing	undo protocol multicast-mac enable	Optional
Configure the router ID	router id router-id	Optional If multiple OSPF processes run on a router, you are recommended to use the router-id keyword in the ospf command to specify different router IDs for different processes.
Enable OSPF and enter OSPF view	ospf [ process-id [ router-id router-id ] ]	Required Enter OSPF view.
Enter OSPF area view	area area-id	—
Configure the network segments in the area	network ip-address wildcard-mask	Required By default, an interface does not belong to any area.

II. Configuring OSPF Area Attributes

Table 1-21 Configure OSPF area attributes

Operation	Command	Remarks
Enter system view	system-view	—
Enter OSPF view	ospf [ process-id [ router-id router-id ] ]	—
Enter OSPF area view	area area-id	—
Configure the current area to be a stub area	stub [ no-summary ]	Optional By default, no area is configured as a stub area.
Configure the current area to be an NSSA area	nssa [ default-route-advertise \| no-import-route \| no-summary ] *	Optional By default, no area is configured as an NSSA area.
Configure the cost of the default route transmitted by OSPF to a stub or NSSA area	default-cost cost	Optional This can be configured on an ABR only. By default, the cost of the default route to a stub or NSSA area is 1.
Create and configure a virtual link	vlink-peer router-id [ hello seconds \| retransmit seconds \| trans-delay seconds \| dead seconds \| simple password \| md5 keyid key ] *	Optional For a virtual link to take effect, you need to use this command at both ends of the virtual link and ensure consistent configurations of the hello, dead, and other parameters at both ends.

III. Configuring the Network Type of an OSPF Interface

Table 1-22 Configure the network type of an OSPF interface

Operation	Command	Remarks
Enter system view	system-view	—
Enter interface view	interface interface-type interface-number	—
Configure the network type of the OSPF interface	ospf network-type { broadcast \| nbma \| p2mp [ unicast ] \| p2p }	Optional By default, the network type of an interface depends on the physical interface.

IV. Configuring an NBMA/P2MP Neighbor

Table 1-23 Configure NBMA/P2MP neighbor

Operation	Command	Remarks
Enter system view	system-view	—
Enter OSPF view	ospf [ process-id [ router-id router-id ] ]	Required
Configure an NBMA/P2MP neighbor	peer ip-address [ dr-priority dr-priority ]	Required By default, the priority for the neighbor of an NBMA interface is 1.

V. Configuring the DR Priority on an OSPF Interface

Table 1-24 Configure the DR priority on an OSPF interface

Operation	Command	Remarks
Enter system view	system-view	—
Enter interface view	interface interface-type interface-number	—
Configure the DR priority on the OSPF interface	ospf dr-priority priority	Optional The default DR priority is 1.

VI. Configuring OSPF Route Summarization

Table 1-25 Configure ABR route summarization

Operation	Command	Remarks
Enter system view	system-view	—
Enter OSPF view	ospf [ process-id [ router-id router-id ] ]	—
Enter area view	area area-id	—
Enable ABR route summarization	abr-summary ip-address mask [ advertise \| not-advertise ]	Required This command takes effect only when it is configured on an ABR. By default, this function is disabled on an ABR.

Table 1-26 Configure ASBR route summarization

Operation	Command	Remarks
Enter system view	system-view	—
Enter OSPF view	ospf [ process-id [ router-id router-id ] ]	—
Enable ASBR route summarization	asbr-summary ip-address mask [ not-advertise \| tag value ]	Required This command takes effect only when it is configured on an ASBR. By default, summarization of imported routes is disabled.

VII. Configuring OSPF to Filter Received Routes

Table 1-27 Configure OSPF to filter received routes

Operation	Command	Remarks
Enter system view	system-view	—
Enter OSPF view	ospf [ process-id [ router-id router-id ] ]	—
Configure to filter the received routes	filter-policy { acl-number \| ip-prefix ip-prefix-name \| gateway ip-prefix-name } import	Required By default, OSPF does not filter received routing information.

VIII. Configuring the OSPF Cost on an Interface

Table 1-28 Configure the OSPF cost on an interface

Operation	Command	Remarks
Enter system view	system-view	—
Enter interface view	interface interface-type interface-number	—
Configure the OSPF cost on the interface	ospf cost value	Optional By default, the interface calculates the OSPF cost according to the current baud rate on it. For a VLAN interface on the switch, a fixed value of 10 is used.

IX. Configuring OSPF Route Priority

Table 1-29 Configure OSPF route priority

Operation	Command	Remarks
Enter system view	system-view	—
Enter OSPF view	ospf [ process-id [ router-id router-id ] ]	—
Configure OSPF route priority	preference [ ase ] value	Optional By default, the OSPF route priority is 10 and the priority of OSPF ASE is 150.

X. Configuring OSPF to Redistribute Routes

Table 1-30 Configure OSPF to redistribute routes

Operation	Command	Remarks
Enter system view	system-view	—
Enter OSPF view	ospf [ process-id [ router-id router-id ] ]	—
Configure OSPF to redistribute routes from another protocol	import-route protocol [ process-id \| allow-ibgp ] [ cost value \| type value \| tag value \| route-policy route-policy-name ]*	Required By default, OSPF does not import the routing information of other protocols.
Configure OSPF to filter outgoing routes	filter-policy { acl-number \| ip-prefix ip-prefix-name } export [ protocol ]	Optional By default, OSPF does not filter advertised routes.
Enable OSPF to import the default route	default-route-advertise [ always \| cost value \| type type-value \| route-policy route-policy-name ]*	Optional By default, OSPF does not import the default route.
Configure the default parameters for redistributed routes, including cost, interval, limit, .tag, and type	default { cost value \| interval seconds \| limit routes \| tag tag \| type type } *	Optional These parameters respectively default to: l Cost: 1 l Interval: 1 (second) l Limit: 1000 l Tag: 1 l Type: 2

XI. Configuring OSPF Timers

Table 1-31 Configure OSPF timers

Operation	Command	Remarks
Enter system view	system-view	—
Enter interface view	interface interface-type interface-number	—
Configure the hello interval on the interface	ospf timer hello seconds	Optional By default, p2p and broadcast interfaces send Hello packets every 10 seconds; while p2mp and NBMA interfaces send Hello packets every 30 seconds.
Configure the poll interval on the NBMA interface	ospf timer poll seconds	Optional By default, poll packets are sent every 40 seconds.
Configure the dead time of the neighboring router on the interface	ospf timer dead seconds	Optional By default, the dead time for the OSPF neighboring router on a p2p or broadcast interface is 40 seconds and that for the OSPF neighboring router on a p2mp or NBMA interface is 120 seconds.
Configure the interval for retransmitting an LSA on an interface	ospf timer retransmit interval	Optional By default, this interval is five seconds.

XII. Configure the LSA transmission delay

Table 1-32 Configure the LSA transmission delay

Operation	Command	Remarks
Enter system view	system-view	—
Enter interface view	interface interface-type interface-number	—
Configure the LSA transmission delay	ospf trans-delay seconds	Optional By default, the LSA transmission delay is one second.

XIII. Configuring the SPF Calculation Interval

Table 1-33 Configure the SPF calculation interval

Operation	Command	Remarks
Enter system view	system-view	—
Enter OSPF view	ospf [ process-id [ router-id router-id ] ]	—
Configure the SPF calculation interval	spf-schedule-interval interval	Optional By default, the SPF calculation interval is five seconds.

XIV. Disabling OSPF Packet Transmission on an Interface

Table 1-34 Disable OSPF packet transmission on an interface

Operation	Command	Remarks
Enter system view	system-view	—
Enter OSPF view	ospf [ process-id [ router-id router-id ] ]	—
Disable OSPF packet transmission on a specified interface	silent-interface silent-interface-type silent-interface-number	Optional By default, all the interfaces are allowed to transmit OSPF packets.

XV. Configuring OSPF Authentication

Table 1-35 Configure OSPF authentication

Operation	Command	Remarks
Enter system view	system-view	—
Enter OSPF view	ospf [ process-id [ router-id router-id ] ]	—
Enter OSPF area view	area area-id	—
Configure the authentication mode of the OSPF area	authentication-mode { simple \| md5 }	Required By default, no authentication mode is configured for an area.
Return to OSPF view	quit	—
Return to system view	quit	—
Enter interface view	interface interface-type interface-number	—
Configure the authentication mode of the OSPF interface	ospf authentication-mode { simple password \| md5 key-id key }	Optional By default, OSPF packets are not authenticated on an interface.

XVI. Configuring the MTU Field in DD Packets

Table 1-36 Configure to fill the MTU field when an interface transmits DD packets

Operation	Command	Remarks
Enter system view	system-view	—
Enter interface view	interface interface-type interface-number	Required
Enable the interface to fill in the MTU field when transmitting DD packets	ospf mtu-enable	Optional By default, the MTU value is 0 when an interface transmits DD packets. That is, the actual MTU value of the interface is not filled in.

XVII. Configuring OSPF Network Management

Table 1-37 Configure OSPF network management (NM)

Operation	Command	Remarks
Enter system view	system-view	—
Configure OSPF MIB binding	ospf mib-binding process-id	Optional By default, OSPF MIB is bound to the first enabled OSPF process.
Enable OSPF Trap sending	snmp-agent trap enable ospf [ process-id ] [ ifauthfail \| ifcfgerror \| ifrxbadpkt \| ifstatechange \| iftxretransmit \| lsdbapproachoverflow \| lsdboverflow \| maxagelsa \| nbrstatechange \| originatelsa \| vifauthfail \| vifcfgerror \| virifrxbadpkt \| virifstatechange \| viriftxretransmit \| virnbrstatechange ]*	Optional You can configure OSPF to send diversified SNMP TRAP messages and specify a certain OSPF process to send SNMP TRAP messages by process ID.

1.2.5 ISIS Configuration

Table 1-38 IS-IS configuration task list

Configuration task		Remarks
IS-IS configuration	Enabling IS-IS	Required
	Configuring a Network Entity Title	Required
	Enabling IS-IS on an Interface	Required
	Configuring a DIS Priority for an Interface	Optional
	Configuring the IS Level	Optional
	Configuring an IS-IS Circuit Level for an Interface	Optional
	Configuring IS-IS Route Redistribution	Optional
	Configuring IS-IS Route Filtering	Optional
	Configuring IS-IS Route Leaking	Optional
	Configuring IS-IS Route Summarization	Optional
	Enabling Default Route Advertisement	Optional
	Configuring a Preference for IS-IS	Optional
	Specifying an IS-IS Cost Style	Optional
	Specifying a Cost for an Interface	Optional
	Configuring IS-IS Timers	Optional
	Configuring IS-IS Authentication	Optional
	Adding an Interface into a Mesh Group	Optional
	Setting the Overload Bit	Optional
	Configuring IS-IS to Discard Checksum Error LSPs	Optional
	Enabling Logging of Neighbor State Changes	Optional
	Configuring the LSP Refresh Interval	Optional
	Configuring the LSP Age	Optional
	Configure SPF Parameters	Optional
	Disabling an Interface from Sending ISIS Packets	Optional

I. Enabling IS-IS

Table 1-39 Enable IS-IS

Operation	Command	Remarks
Enter system view	system-view	—
Enable IS-IS	isis [ tag ]	Required Disabled by default

Operation

Command

Remarks

Enter system view

system-view

—

Enable IS-IS

isis [ tag ]

Required

Disabled by default

II. Configuring a Network Entity Title

Table 1-40 Configure a network entity title

Operation	Command	Remarks
Enter system view	system-view	—
Enter IS-IS view	isis [ tag ]	—
Specify a network entity title	network-entity net	Required

III. Enabling IS-IS on an Interface

Table 1-41 Enable IS-IS on an interface

Operation	Command	Remarks
Enter system view	system-view	—
Enter interface view	interface interface-type interface-number	—
Enable IS-IS on the interface	isis enable [ tag ]	Required

IV. Configuring a DIS Priority for an Interface

Table 1-42 Configure a DIS priority for an interface

Operation	Command	Remarks
Enter system view	system-view	—
Enter interface view	interface interface-type interface-number	—
Configure a DIS priority for an interface	isis dis-priority value [ level-1 \| level-2 ]	Required 64 by default.

V. Configuring the IS Level

Table 1-43 Configure the IS Level

Operation	Command	Remarks
Enter system view	system-view	—
Enter IS-IS view	isis [ tag ]	—
Configure the IS Level	is-level { level-1 \| level-1-2 \| level-2 }	Required level-1-2 by default.

VI. Configuring an IS-IS Circuit Level for an Interface

Table 1-44 Configure an IS-IS circuit level for an interface

Operation	Command	Remarks
Enter system view	system-view	—
Enter interface view	interface interface-type interface-number	—
Configure an IS-IS circuit level for the interface	isis circuit-level [ level-1 \| level-1-2 \| level-2 ]	Required level-1-2 by default.

VII. Configuring IS-IS Route Redistribution

Table 1-45 Configure IS-IS route redistribution

Operation	Command	Remarks
Enter system view	system-view	—
Enter IS-IS view	isis [ tag ]	—
Configuring IS-IS route redistribution from another routing protocol	import-route protocol [ allow-ibgp ] [ cost value \| type { external \| internal } \| [ level-1 \| level-1-2 \| level-2 ] \| route-policy route-policy-name ]*	Required No redistribution is configured by default.

VIII. Configuring IS-IS Route Filtering

Table 1-46 Configure incoming route filtering

Operation	Command	Remarks
Enter system view	system-view	—
Enter IS-IS view	isis [ tag ]	—
Configure incoming route filtering	filter-policy acl-number import	Required Not configured by default.

Table 1-47 Configure the filtering of routes redistributed from another routing protocol

Operation	Command	Remarks
Enter system view	system-view	—
Enter IS-IS view	isis [ tag ]	—
Configure the filtering of routes redistributed from another routing protocol	filter-policy acl-number export [ protocol ]	Required Not configured by default.

IX. Configuring IS-IS Route Leaking

Table 1-48 Configuring IS-IS route leaking

Operation	Command	Remarks
Enter system view	system-view	—
Enter IS-IS view	isis [ tag ]	—
Enable IS-IS route leaking from level-2 to level-1	import-route isis level-2 into level-1 [ acl acl-number ]	Required Disabled by default.

X. Configuring IS-IS Route Summarization

Table 1-49 Configure IS-IS route summarization

Operation	Command	Remarks
Enter system view	system-view	—
Enter IS-IS view	isis [ tag ]	—
Configure a summary IS-IS route	summary ip-address ip-mask [ level-1 \| level-1-2 \| level-2 ]	Required Not configured by default.

XI. Enabling Default Route Advertisement

Table 1-50 Enable default route advertisement

Operation	Command	Remarks
Enter system view	system-view	—
Enter IS-IS view	isis [ tag ]	—
Enable default route advertisement	default-route-advertise [ route-policy route-policy-name ]	Required Only the same level routers can accept the default route.

XII. Configuring a Preference for IS-IS

Table 1-51 Configure a preference for IS-IS

Operation	Command	Remarks
Enter system view	system-view	—
Enter IS-IS view	isis [ tag ]	—
Configure a preference for IS-IS	preference [ value \| clns \| ip ]	Required 15 by default.

XIII. Specifying an IS-IS Cost Style

Table 1-52 Specify an IS-IS cost style

Operation	Command	Remarks
Enter system view	System-view	—
Enter IS-IS view	isis [ tag ]	—
Specify an IS-IS cost style	cost-style { narrow \| wide \| wide-compatible \| { compatible \| narrow-compatible } [ relax-spf-limit ] }	Required narrow by default.

XIV. Specifying a Cost for an Interface

Table 1-53 Specify a cost for an interface

Operation	Command	Remarks
Enter system view	system-view	—
Enter interface view	interface interface-type interface-number	—
Specify a cost for the interface	isis cost value [ level-1 \| level-2 ]	Required 10 by default.

XV. Configuring IS-IS Timers

Table 1-54 Configure the hello interval for an interface

Operation	Command	Remarks
Enter system view	system-view	—
Enter interface view	interface interface-type interface-number	—
Specify a hello interval in seconds on the interface	isis timer hello seconds [ level-1 \| level-2 ]	Required 10 seconds by default.

Table 1-55 Specify the interval for sending CSNPs for an interface

Operation	Command	Remarks
Enter system view	system-view	—
Enter interface view	interface interface-type interface-number	—
Specify the interval in seconds for sending CSNPs	isis timer csnp seconds [ level-1 \| level-2 ]	Required 10 seconds by default.

Table 1-56 Specify the interval for sending LSPs for an interface

Operation	Command	Remarks
Enter system view	system-view	—
Enter interface view	interface interface-type interface-number	—
Specify the interval for sending LSPs	isis timer lsp time	Required 33 milliseconds by default.

Table 1-57 Specify the interval for retransmitting an LSP for an interface

Operation	Command	Remarks
Enter system view	system-view	—
Enter interface view	interface interface-type interface-number	—
Specify the interval for retransmitting an LSP on a P2P link	isis timer retransmit seconds	Required 5 seconds by default.

Table 1-58 Specify a hello multiplexer for an interface

Operation	Command	Remarks
Enter system view	system-view	—
Enter interface view	interface interface-type interface-number	—
Specify a hello multiplexer for the interface	isis timer holding-multiplier value [ level-1 \| level-2 ]	Required 3 by default.

XVI. Configuring IS-IS Authentication

Table 1-59 Configure IS-IS interface authentication

Operation	Command	Remarks
Enter system view	system-view	—
Enter interface view	interface interface-type interface-number	—
Configure the IS-IS authentication mode and password on the interface	isis authentication-mode { simple \| md5 } password [ { level-1 \| level-2 } [ ip \| osi ] ]	Required Not configured by default.

Table 1-60 Configure IS-IS area and routing domain authentication

Operation	Command	Remarks
Enter system view	system-view	—
Enter IS-IS view	isis [ tag ]	—
Configure the area authentication mode and password	area-authentication-mode { simple \| md5 } password [ ip \| osi ]	Optional Not configured by default.
Configure the routing domain authentication mode and password	domain-authentication-mode { simple \| md5 } password [ ip \| osi ]	Optional Not configured by default.

Table 1-61 Allow MD5 to be compatible with other vendors

Operation	Command	Remarks
Enter system view	system-view	—
Enter IS-IS view	isis [ tag ]	—
Allow MD5 to be compatible with other vendors	md5-compatible	Required
Configure IS-IS to use the default MD5 algorithm	undo md5-compatible	Optional By default, the private MD5 algorithm is used.

XVII. Adding an Interface into a Mesh Group

Table 1-62 Add an interface into a mesh group

Operation	Command	Remarks
Enter system view	system-view	—
Enter interface view	interface interface-type interface-number	—
Add an interface into a mesh group	isis mesh-group { mesh-group-number \| mesh-blocked }	Required Not configured by default.

XVIII. Setting the Overload Bit

Table 1-63 Set the overload bit

Operation	Command	Remarks
Enter system view	system-view	—
Enter IS-IS view	isis [ tag ]	—
Set the overload bit	set-overload	Required Not set by default.

XIX. Configuring IS-IS to Discard Checksum Error LSPs

Table 1-64 Configure IS-IS to discard checksum error LSPs

Operation	Command	Remarks
Enter system view	system-view	—
Enter IS-IS view	isis [ tag ]	—
Configure IS-IS to discard checksum error LSPs	ignore-lsp-checksum-error	Required By default, ISIS ignores checksum error LSPs.

XX. Enabling Logging of Neighbor State Changes

Table 1-65 Enable logging of neighbor state changes

Operation	Command	Remarks
Enter system view	system-view	—
Enter IS-IS view	isis [ tag ]	—
Enable logging of neighbor state changes	log-peer-change	Required Disabled by default.

XXI. Configuring the LSP Refresh Interval

Table 1-66 Configure the LSP refresh interval

Operation	Command	Remarks
Enter system view	system-view	—
Enter IS-IS view	isis [ tag ]	—
Configure the LSP refresh interval	timer lsp-refresh seconds	Required 900 seconds by default.

XXII. Configuring the LSP Age

Table 1-67 Configure the LSP age

Operation	Command	Remarks
Enter system view	system-view	—
Enter IS-IS view	isis [ tag ]	—
Configure the LSP age	timer lsp-max-age seconds	Required 1200 seconds by default.

XXIII. Configure SPF Parameters

Table 1-68 Specify the SPF calculation interval

Operation	Command	Remarks
Enter system view	system-view	—
Enter IS-IS view	isis [ tag ]	—
Specify the SPF calculation interval	timer spf seconds [ level-1 \| level-2 ]	Required 10 seconds by default.

Table 1-69 Specify the interval of an SPF slice

Operation	Command	Remarks
Enter system view	system-view	—
Enter IS-IS view	isis [ tag ]	—
Specify the interval of an SPF slice	spf-slice-size seconds	Required By default, an SPF calculation is not sliced.

Table 1-70 Configure SPF to release CPU

Operation	Command	Remarks
Enter system view	system-view	—
Enter IS-IS view	isis [ tag ]	—
Configure SPF to release the CPU after processing the specified number of routes	spf-delay-interval number	Required By default, SPF releases the CPU each time it finishes processing 5000 routes.

XXIV. Disabling an Interface from Sending ISIS Packets

Table 1-71 Disable an interface from sending ISIS packets

Operation	Command	Remarks
Enter system view	system-view	—
Enter IS-IS view	isis [ tag ]	—
Disable an interface from sending ISIS packets	silent-interface interface-type interface-number	Required Enabled by default.

1.2.6 BGP Configuration

Table 1-72 BGP configuration task list

Configuration task		Remarks
Configuring Basic BGP Functions		Required
Configuring the way to advertise/receive routing information	Importing Routes	Optional
	Configuring BGP Route Aggregation	Optional
	Enabling Default Route Advertising	Optional
	Configuring route reception filtering policies	Optional
	Configuring route advertisement filtering policies	Optional
	Disabling BGP-IGP Route Synchronization	Optional
	Configuring BGP Load Balancing	Optional
	Configuring BGP Route Dampening	Optional
Configuring BGP Route Attributes		Optional
Adjusting and Optimizing a BGP Network		Optional
Configure a large-scale BGP network	Configuring BGP Peer Group	Required
	Configuring BGP Community	Required
	Configuring BGP RR	Optional
	Configuring BGP Confederation	Optional

I. Configuring Basic BGP Functions

Table 1-73 Configure basic BGP functions

Operation	Command	Description
Enter system view	system-view	—
Enable BGP and enter BGP view	bgp as-number	Required By default, BGP is disabled.
Specify the AS number for the BGP peers	peer group-name as-number as-number	By default, a peer is not assigned an AS number.
Assign a description string for a BGP peer/a BGP peer group	peer { group-name \| ip-address } description description-text	Optional By default, a peer/a peer group is not assigned a description string.
Activate a specified BGP peer	peer { group-name \| ip-address } enable	Optional By default, a BGP peer is active.
Specify the source interface for route update packets	peer { group-name \| ip-address } connect-interface interface-type interface-number	Optional By default, the source interface of the optimal route update packets is used as the source interface.
Allow routers that belong to non-directly connected networks to establish EBGP connections.	peer group-name ebgp-max-hop [ hop-count ]	Optional By default, routers that belong to two non-directly connected networks cannot establish EBGP connections. You can configure the maximum hops of EBGP connection by specifying the hop-count argument.

II. Importing Routes

Table 1-74 Import routes

Operation	Command	Description
Enter system view	system-view	—
Enable BGP, and enter BGP view	bgp as-number	—
Import the default route to the BGP routing table	default-route imported	Optional By default, BGP does not import default routes to BGP routing table.
Import and advertise routing information generated by other protocols.	import-route protocol [ process-id ] [ med med-value \| route-policy route-policy-name ]*	Required By default, BGP does not import nor advertise the routing information generated by other protocols.
Advertise network segment routes to BGP routing table	network network-address [ mask ] [route-policy route-policy-name ]	Optional By default, BGP does not advertise any network segment routes.

III. Configuring BGP Route Aggregation

Table 1-75 Configure BGP route aggregation

Operation		Command	Description
Enter system view		system-view	—
Enable BGP, and enter BGP view		bgp as-number	Required By default, BGP is disabled.
Configure BGP route aggregation	Enable automatic route aggregation	summary	Required By default, routes are not aggregated.
Configure BGP route aggregation	Enable manual route aggregation	aggregate ip-address mask [ as-set \| attribute-policy route-policy-name \| detail-suppressed \| origin-policy route-policy-name \| suppress-policy route-policy-name ]*	Required By default, routes are not aggregated.

IV. Enabling Default Route Advertising

Table 1-76 Enable default rout advertising

Operation	Command	Description
Enter system view	system-view	—
Enter BGP view	bgp as-number	—
Enable default route advertising	peer group-name default-route-advertise	Required By default, a BGP router does not send default routes to a specified peer/peer group.

V. Configuring route reception filtering policies

Table 1-77 Configure route reception filtering policies

Operation		Command	Description
Enter system view		system-view	—
Enter BGP view		bgp as-number	—
Configure the global route reception filtering policy		filter-policy { acl-number \| gateway ip-prefix-name \| ip-prefix ip-prefix-name [ gateway ip-prefix-name ] } import	Required By default, the incoming routing information is not filtered.
Reference a routing policy to filter routes from a peer/peer group		peer { group-name \| ip-address } route-policy policy-name import	Required By default, no route filtering policy is specified for a peer/peer group.
Filter the routing information from a peer/peer group	Reference an ACL to filter BGP routes from a peer/peer group	peer { group-name \| ip-address } filter-policy acl-number import	Required By default, no ACL-based BGP route filtering policy, AS path ACL-based BGP route filtering policy, or IP prefix list-based BGP route filtering policy is configured for a peer/peer group.
	Reference an AS path ACL to filter routes from a peer/peer group	peer { group-name \| ip-address } as-path-acl acl-number import
	Reference an IP prefix list to filter routes from a peer/peer group	peer { group-name \| ip-address } ip-prefix ip-prefix-name import

VI. Configuring route advertisement filtering policies

Table 1-78 Configure route advertisement filtering policies

Operation		Command	Description
Enter system view		system-view	—
Enter BGP view		bgp as-number	—
Configure the global route advertisement filtering policy		filter-policy { acl-number \| ip-prefix ip-prefix-name } export [ protocol [ process-id ] ]	Required By default, advertised routes are not filtered.
Reference a routing policy to filter the routes to a peer group		peer group-name route-policy route-policy-name export	Required By default, no route advertising policy is specified for the routes advertised to a peer group.
Filter the routing information to a peer group	Reference an ACL to filter BGP routes to a peer group	peer group-name filter-policy acl-number export	Required Not configured by default
	Reference an AS path ACL to filter BGP routes to a peer group	peer group-name as-path-acl acl-number export
	Reference an IP prefix list to filter BGP routes to a peer group	peer group-name ip-prefix ip-prefix-name export

VII. Disabling BGP-IGP Route Synchronization

Table 1-79 Disable BGP-IGP route synchronization

Operation	Command	Description
Enter system view	system-view	—
Enter BGP view	bgp as-number	—
Disable BGP-IGP route synchronization	undo synchronization	Required By default, BGP routes and IGP routes are not synchronized.

VIII. Configuring BGP Load Balancing

Table 1-80 Configure BGP load balancing

Operation	Command	Description
Enter system view	system-view	—
Enter BGP view	bgp as-number	—
Configure the maximum number of equal cost BGP routes for load balancing	balance num	Required By default, no load balancing is configured.

IX. Configuring BGP Route Dampening

Table 1-81 Configure BGP route dampening

Operation	Command	Description
Enter system view	system-view	—
Enter BGP view	bgp as-number	—
Configure BGP route dampening-related parameters	dampening [ half-life-reachable half-life-unreachable reuse suppress ceiling ] [ route-policy route-policy-name ]	Required By default, route dampening is disabled. Other default route dampening-related parameters are as follows. l half-life-reachable: 15 (in minutes) l half-life-unreachable: 15 (in minutes) l reuse: 750 l suppress: 2000 l ceiling: 16,000

X. Configuring BGP Route Attributes

Table 1-82 Configure BGP route attributes

Operation			Command	Description
Enter system view			system-view	—
Enter BGP view			bgp as-number	—
Configure the management preference of the exterior, interior and local routes			preference ebgp-value ibgp-value local-value	Optional By default, the management preference of the exterior, interior and local routes is 256, 256, and 130.
Set the default local preference			default local-preference value	Optional By default, the local preference defaults to 100.
Configure the MED attribute	Configure the default local MED value		default med med-value	Optional By default, the med-value argument is 0.
Configure the MED attribute	Permit to compare the MED values of the routes coming from the neighbor routers in different ASs.		compare-different-as-med	Optional By default, the compare of MED values of the routes coming from the neighbor routers in different ASs is disabled.
Configure the local address as the next hop address when a BGP router advertises a route.			peer group-name next-hop-local	Required In some network, to ensure an IBGP neighbor locates the correct next hop, you can configure the next hop address of a route to be the local address for a BGP router to advertise route information to IBGP peer groups.
Configure the AS_Path attribute		Configure the number of local AS number occurrences allowed	peer { group-name \| ip-address } allow-as-loop [ number ]	Optional By default, the number of local AS number occurrences allowed is 1.
		Assign an AS number for a peer group	peer group-name as-number as-number	Optional By default, the local AS number is not assigned to a peer group.
		Configure that the BGP update packets only carry the pubic AS number in the AS_Path attribute when a peer sends BGP update packets to BGP peers.	peer group-name public-as-only	Optional By default, a BGP update packet carries the private AS number.

XI. Adjusting and Optimizing a BGP Network

Table 1-83 Adjust and optimize a BGP network

Operation		Command	Description
Enter system view		system-view	—
Enter BGP view		bgp as-number	—
Configure BGP timer	Configure the Keepalive time and Holdtime of BGP.	timer keepalive keepalive-interval hold holdtime-interval	Optional By default, the keepalive time is 60 seconds, and holdtime is 180 seconds. The priority of the timer configured by the timer command is lower than that of the timer configured by the peer time command.
Configure BGP timer	Configure the Keepalive time and holdtime of a specified peer/peer group.	peer { group-name \| ip-address } timer keepalive keepalive-interval hold holdtime-interval
Configure the interval at which a peer group sends the same route update packet		peer group-name route-update-interval seconds	Optional By default, the interval at which a peer group sends the same route update packet to IBGP peers is 15 seconds, and to EBGP peers is 30 seconds.
Perform soft refreshment of BGP connection manually		return	—
		refresh bgp { all \| ip-address \| group group-name } [ multicast ] { import \| export }	Optional
		system-view	Enter BGP view again
		bgp as-number	Enter BGP view again
Configure BGP to perform MD5 authentication when establishing TCP connection		peer { group-name \| ip-address } password { cipher \| simple } password	Optional By default, BGP dose not perform MD5 authentication when establishing TCP connection.

XII. Configuring BGP Peer Group

Table 1-84 Configure BGP peer group

Operation		Command	Description
Enter system view		system-view	—
Enter BGP view		bgp as-number	—
Create an IBGP peer group	Create an IBGP peer group	group group-name [ internal ]	Optional If the command is executed without the internal or external keyword, an IBGP peer group will be created. You can add multiple peers to the group, and the system will automatically create a peer in BGP view, and configure its AS number as the local AS number.
Create an IBGP peer group	Add a peer to a peer group	peer ip-address group group-name [ as-number as-number ]
Create an EBGP peer group	Create an EBGP peer group	group group-name external	Optional You can add multiple peers to the group. The system automatically creates the peer in BGP view and specifies its AS number as the one of the peer group.
	Configure the AS number of a peer group	peer group-name as-number as-number
	Add a peer to a peer group	peer ip-address group group-name [ as-number as-number ]
Create a hybrid EBGP peer group	Create an EBGP peer group	group group-name external	Optional You can add multiple peers to the peer group.
Create a hybrid EBGP peer group	Add a peer to a peer group	peer ip-address group group-name [ as-number as-number ]	Optional You can add multiple peers to the peer group.
Finish the session with the specified peer/peer group		peer { group-name \| ip-address } shutdown	Optional

XIII. Configuring BGP Community

Table 1-85 Configure BGP community

Operation	Command	Description
Enter system view	system-view	—
Enter BGP view	bgp as-number	—
Configure the peers to advertise community attribute to each other	peer group-name advertise-community	Required By default, no community attribute or extended community attribute is advertised to any peer group.
Specify routing policy for the routes exported to the peer group	peer group-name route-policy route-policy-name export	Required By default, no routing policy is specified for the routes exported to the peer group.

XIV. Configuring BGP RR

Table 1-86 Configure BGP RR

Operation	Command	Description
Enter system view	system-view	—
Enter BGP view	bgp as-number	—
Configure the local router as the RR and configure the peer group as the client of the RR	peer group-name reflect-client	Required By default, no RR or its client is configured.
Enable route reflection between clients	reflect between-clients	Optional By default, route reflection is enabled between clients.
Configure cluster ID of an RR	reflector cluster-id cluster-id	Optional By default, an RR uses its own router ID as the cluster ID.

XV. Configuring BGP Confederation

Table 1-87 Configure BGP confederation

Operation		Command	Description
Enter system view		system-view	—
Enter BGP view		bgp as-number	—
Basic BGP confederation configuration	Configure confederation ID	confederation id as-number	Required By default, no confederation ID is configured and no sub-AS is configured for a confederation.
Basic BGP confederation configuration	Specify the sub-ASs included in a confederation	confederation peer-as as-number-list
Configure the compatibility of a confederation		confederation { nonstandard \| standard1965 \| standard3065 }	Optional By default, the confederation configured is consistent with the RFC 1965.

1.2.7 Route Policy Configuration

Table 1-88 Route policy configuration task list

Configuration task		Remarks
Configuring an IP Prefix List		Optional
Configuring an AS Path List		Optional
Configuring Community Lists		Optional
Define a routing policy	Defining a Routing Policy	Required
	Define if-match Clauses	Optional
	Define apply Clauses	Optional

I. Configuring an IP Prefix List

Table 1-89 Configure an IPv4 IP-prefix list

Operation

Command

Remarks

Enter system view

system-view

—

Configure an IPv4 IP-prefix list

ip ip-prefix ip-prefix-name [ index index-number ] { permit | deny } network len [ greater-equal greater-equal | less-equal less-equal ]

Required

By default, no IP-prefix list is specified.

II. Configuring an AS Path List

Table 1-90 AS path list configuration

Operation

Command

Description

Enter system view

system-view

—

Configure AS path list

ip as-path-acl acl-number { permit | deny } as-regular-expression

Optional

By default, no AS path list is defined

III. Configuring Community Lists

Table 1-91 Community list configuration

Operation	Command	Description
Enter system view	system-view	—
Configure basic community list	ip community-list basic-comm-list-number { permit \| deny } [ aa:nn &<1-12> \| internet \| no-export-subconfed \| no-advertise \| no-export ]*	Optional By default, no BGP community list is defined
Configure advanced community list	ip community-list adv-comm-list-number { permit \| deny } comm-regular-expression	Optional By default, no BGP community list is defined

IV. Defining a Routing Policy

Table 1-92 Define a routing policy

Operation

Command

Remarks

Enter system view

system-view

—

Define a routing policy and enter the routing policy view

route-policy route-policy-name { permit | deny } node node-number

Required

By default, no routing policy is defined.

V. Define if-match Clauses

Table 1-93 Define if-match clauses

Operation	Command	Description
Enter system view	system-view	—
Enter the route-policy view	route-policy route-policy-name { permit \| deny } node node-number	Required
Define a rule to match AS path of BGP routing information	if-match as-path as-path-number	Optional
Define a rule to match community attributes of BGP routing information	if-match community { basic-community-number [ whole-match ] \| adv-community-number }	Optional
Define a rule to match the IP address of routing information	if-match { acl acl-number \| ip-prefix ip-prefix-name }	Optional By default, no matching is performed on the address of routing information.
Define a rule to match the routing cost of routing information	if-match cost value	Optional By default, no matching is performed on the routing cost of routing information.
Define a rule to match the next-hop interface of routing information	if-match interface interface-type interface-number	Optional By default, no matching is performed on the next-hop interface of routing information.
Define a rule to match the next-hop address of routing information	if-match ip next-hop { acl acl-number \| ip-prefix ip-prefix-name }	Optional By default, no matching is performed on the next-hop address of routing information.
Define a rule to match the tag field of OSPF routing information	if-match tag value	Optional By default, no matching is performed on the tag field of OSPF routing information.

VI. Define apply Clauses

Table 1-94 Define apply clauses

Operation	Command	Description
Enter system view	system-view	—
Enter the route-policy view	route-policy route-policy-name { permit \| deny } node node-number	Required
Add the specified AS number list in BGP routing information	apply as-path as-number-list	Optional
Configure community attributes for BGP routing information	apply community { none \| [ aa:nn ] &<1-13> [ no-export-subconfed \| no-export \| no-advertise ]* [ additive ] }	Optional
Set next hop IP address for routing information	apply ip next-hop ip-address	Optional
Import routing information into the specified IS-IS level	apply isis [ level-1 \| level-2 \| level-1-2 ]	Optional
Set the local preference of BGP routing information	apply local-preference local-preference	Optional
Define an action to set the cost of routing information	apply cost value	Optional By default, no action is defined to set the routing cost of routing information.
Set route cost type for routing information	apply cost-type [ internal \| external ]	Optional
Set route source of BGP routing information	apply origin { igp \| egp as-number \| incomplete }	Optional
Define an action to set the tag field of routing information	apply tag value	Optional By default, no action is defined to set the tag field of OSPF routing information.

Chapter 2 Configuration Examples

& Note:

The following configuration examples use the S7500 series switches.

2.1 Configuration Examples

2.1.1 Static Routing Configuration Example

I. Network requirements

1) Requirement analysis:

A small company requires any two nodes in its network communicate with each other. The network should be simple and stable. The customer hopes to make the best use of the existing devices that do not support dynamic routing protocols.

Based on the customer requirements and networking environment, configure static routes to realize network interconnection.

2) Network diagram

Figure 2-1 shows the network diagram.

Figure 2-1 Network diagram for static route configuration

II. Configuration procedure

Configure the switches:

# Configure static routes on Switch A.

<SwitchA> system-view

[SwitchA] ip route-static 1.1.3.0 255.255.255.0 1.1.2.2

[SwitchA] ip route-static 1.1.4.0 255.255.255.0 1.1.2.2

[SwitchA] ip route-static 1.1.5.0 255.255.255.0 1.1.2.2

# Configure static routes on Switch B.

<SwitchB> system-view

[SwitchB] ip route-static 1.1.2.0 255.255.255.0 1.1.3.1

[SwitchB] ip route-static 1.1.5.0 255.255.255.0 1.1.3.1

[SwitchB] ip route-static 1.1.1.0 255.255.255.0 1.1.3.1

# Configure static routes on Switch C.

<SwitchC> system-view

[SwitchC] ip route-static 1.1.1.0 255.255.255.0 1.1.2.1

[SwitchC] ip route-static 1.1.4.0 255.255.255.0 1.1.3.2

Configure the hosts:

# Configure the default gateway as 1.1.5.1 on host A (omitted).

# Configure the default gateway as 1.1.4.1 on host B (omitted).

# Configure the default gateway as 1.1.1.1 on host C (omitted).

Now any two hosts or switches can communicate with each other.

2.1.2 RIP Configuration Examples

I. Network requirements

1) Requirement analysis:

A small company requires any two nodes in its network can communicate with each other. The devices can dynamically adjust to network topology changes.

Based on the customer requirements and networking environment, use RIP to realize network interconnection.

2) Network diagram

Figure 2-2 shows the network diagram.

Device	Interface	IP Address	Device	Interface	IP Address
Switch A	Vlan-int1	110.11.2.1/24	Switch B	Vlan-int1	110.11.2.2/24
	Vlan-int2	155.10.1.1/24		Vlan-int3	196.38.165.1/24
Switch C	Vlan-int1	110.11.2.3/24
	Vlan-int4	117.102.0.1/16

Figure 2-2 Network diagram for RIP configuration

II. Configuration procedure

& Note:

Only RIP-related configurations are described below. Before performing the following configurations, make sure that the data link layer works normally and the IP addresses of the VLAN interfaces have been configured.

1) Configure Switch A.

# Configure RIP.

<SwitchA> system-view

[SwitchA] rip

[SwitchA-rip] network 110.11.2.0

[SwitchA-rip] network 155.10.1.0

2) Configure Switch B.

# Configure RIP.

<SwitchB> system-view

[SwitchB] rip

[SwitchB-rip] network 196.38.165.0

[SwitchB-rip] network 110.11.2.0

3) Configure Switch C.

# Configure RIP.

<SwitchC> system-view

[SwitchC] rip

[SwitchC-rip] network 117.102.0.0

[SwitchC-rip] network 110.11.2.0

2.1.3 DR Configuration Example

I. Network requirements

1) Requirement analysis

Use OSPF to realize interconnection between devices in a broadcast network. Devices with higher performance should become the DR and BDR to improve network performance. Devices with lower performance are forbidden to take part in DB/BDR election.

Based on the customer requirements and networking environment, assign proper priorities to interfaces.

2) Network diagram

Figure 2-3 shows the network diagram.

Device	Interface	IP address	Router ID	Interface priority
Switch A	Vlan-int1	196.1.1.1/24	1.1.1.1	100
Switch B	Vlan-int1	196.1.1.2/24	2.2.2.2	0
Switch C	Vlan-int1	196.1.1.3/24	3.3.3.3	2
Switch D	Vlan-int1	196.1.1.4/24	4.4.4.4	1

Figure 2-3 Network diagram for OSPF DR selection

II. Configuration procedure

# Configure Switch A.

<SwitchA> system-view

[SwitchA] interface Vlan-interface 1

[SwitchA-Vlan-interface1] ip address 196.1.1.1 255.255.255.0

[SwitchA-Vlan-interface1] ospf dr-priority 100

[SwitchA-Vlan-interface1] quit

[SwitchA] router id 1.1.1.1

[SwitchA] ospf

[SwitchA-ospf-1] area 0

[SwitchA-ospf-1-area-0.0.0.0] network 196.1.1.0 0.0.0.255

# Configure Switch B.

<SwitchB> system-view

[SwitchB] interface Vlan-interface 1

[SwitchB-Vlan-interface1] ip address 196.1.1.2 255.255.255.0

[SwitchB-Vlan-interface1] ospf dr-priority 0

[SwitchB-Vlan-interface1] quit

[SwitchB] router id 2.2.2.2

[SwitchB] ospf

[SwitchB-ospf-1] area 0

[SwitchB-ospf-1-area-0.0.0.0] network 196.1.1.0 0.0.0.255

# Configure Switch C.

<SwitchC> system-view

[SwitchC] interface Vlan-interface 1

[SwitchC-Vlan-interface1] ip address 196.1.1.3 255.255.255.0

[SwitchC-Vlan-interface1] ospf dr-priority 2

[SwitchC-Vlan-interface1] quit

[SwitchC] router id 3.3.3.3

[SwitchC] ospf

[SwitchC-ospf-1] area 0

[SwitchC-ospf-1-area-0.0.0.0] network 196.1.1.0 0.0.0.255

# Configure Switch D.

<SwitchD> system-view

[SwitchD] interface Vlan-interface 1

[SwitchD-Vlan-interface1] ip address 196.1.1.4 255.255.255.0

[SwitchD-Vlan-interface1] quit

[SwitchD] router id 4.4.4.4

[SwitchD] ospf

[SwitchD-ospf-1] area 0

[SwitchD-ospf-1-area-0.0.0.0] network 196.1.1.0 0.0.0.255

Use the display ospf peer command to display OSPF neighbors on Switch A. Note that Switch A has three neighbors.

The state of each neighbor is full. This means that Switch A has formed adjacencies with all neighbors. (Switch A and Switch C can act as the DR and BDR only when they establish adjacencies with all the switches in the network.) Switch A acts as the DR, while Switch C acts as the BDR. Any other neighbor is DRother (neither DR nor BDR).

# Change the priority of Switch B to 200.

<SwitchB> system-view

[SwitchB] interface Vlan-interface 1

[SwitchB-Vlan-interface1] ospf dr-priority 200

Use the display ospf peer command to display OSPF neighbors on Switch A. Note that the priority of Switch B is 200 now, but it is not the DR.

The DR will be reelected only after the current DR fails to work. Shut down Switch A and use the display ospf peer command to display neighbors on Switch D. Note that Switch C that used to be the BDR becomes the DR and Switch B becomes the BDR.

If you shut down and then restart all the switches, Switch B with priority 200 will be elected as the DR and Switch A with priority 100 will be elected as the BDR, because such operation triggers a new round of DR/BDR election.

2.1.4 OSPF Virtual Link Configuration Examples

I. Network requirements

1) Requirement analysis

Devices in the network run OSPF to realize interconnection. The network is split into three areas: one backbone area and two non-backbone areas (Area 1 and Area 2). Area 2 has no direct connection to the backbone, and it has to reach the backbone through Area 1. The customer hopes that Area 2 can interconnect with other two areas.

Based on the customer requirements and networking environment, use a virtual link to connect Area 2 to the backbone area.

2) Network diagram

Figure 2-4 shows the network diagram.

Device	Interface	IP address	Router ID
Switch A	Vlan-int1	196.1.1.2/24	1.1.1.1
	Vlan-int2	197.1.1.2/24	—
Switch B	Vlan-int1	152.1.1.1/24	2.2.2.2
	Vlan-int2	197.1.1.1/24	—

Figure 2-4 Network diagram for virtual link configuration

II. Configuration procedure

1) Configure OSPF basic functions

# Configure Switch A.

<SwitchA> system-view

[SwitchA] interface vlan-interface 1

[SwitchA-Vlan-interface1] ip address 196.1.1.2 255.255.255.0

[SwitchA-Vlan-interface1] quit

[SwitchA] interface vlan-interface 2

[SwitchA-Vlan-interface2] ip address 197.1.1.2 255.255.255.0

[SwitchA-Vlan-interface2] quit

[SwitchA] router id 1.1.1.1

[SwitchA] ospf

[SwitchA-ospf-1] area 0

[SwitchA-ospf-1-area-0.0.0.0] network 196.1.1.0 0.0.0.255

[SwitchA-ospf-1-area-0.0.0.0] quit

[SwitchA-ospf-1] area 1

[SwitchA-ospf-1-area-0.0.0.1] network 197.1.1.0 0.0.0.255

[SwitchA-ospf-1-area-0.0.0.1] quit

[SwitchA-ospf-1] quit

# Configure Switch B.

<SwitchB> system-view

[SwitchB] interface Vlan-interface 1

[SwitchB-Vlan-interface1] ip address 152.1.1.1 255.255.255.0

[SwitchB-Vlan-interface1] quit

[SwitchB] interface Vlan-interface 2

[SwitchB-Vlan-interface2] ip address 197.1.1.1 255.255.255.0

[SwitchB-Vlan-interface2] quit

[SwitchB] router id 2.2.2.2

[SwitchB] ospf

[SwitchB-ospf-1] area 1

[SwitchB-ospf-1-area-0.0.0.1] network 197.1.1.0 0.0.0.255

[SwitchB-ospf-1-area-0.0.0.1] quit

[SwitchB-ospf-1] area 2

[SwitchB-ospf-1-area-0.0.0.2] network 152.1.1.0 0.0.0.255

[SwitchB-ospf-1-area-0.0.0.2] quit

# Display the OSPF routing table on Switch A

[SwitchA] display ospf routing

OSPF Process 1 with Router ID 1.1.1.1

Routing Tables

Routing for Network

Destination Cost Type NextHop AdvRouter Area

196.1.1.0/24 10 Stub 196.1.1.2 1.1.1.1 0.0.0.0

197.1.1.0/24 10 Net 197.1.1.1 2.2.2.2 0.0.0.1

Total Nets: 2

Intra Area: 2 Inter Area: 0 ASE: 0 NSSA: 0

& Note:

Since Area2 has no direct connection to Area0, the routing table of RouterA has no route to Area2.

2) Configure a virtual link

# Configure Switch A.

[SwitchA] ospf

[SwitchA-ospf-1] area 1

[SwitchA-ospf-1-area-0.0.0.1] vlink-peer 2.2.2.2

[SwitchA-ospf-1-area-0.0.0.1] quit

[SwitchA-ospf-1] quit

# Configure Switch B.

[SwitchB-ospf-1] area 1

[SwitchB-ospf-1-area-0.0.0.1] vlink-peer 1.1.1.1

[SwitchB-ospf-1-area-0.0.0.1] quit

# Display the OSPF routing table on Switch A.

[SwitchA]display ospf routing

OSPF Process 1 with Router ID 1.1.1.1

Routing Tables

Routing for Network

Destination Cost Type NextHop AdvRouter Area

196.1.1.0/24 10 Stub 196.1.1.2 1.1.1.1 0.0.0.0

197.1.1.0/24 10 Net 197.1.1.1 2.2.2.2 0.0.0.1

152.1.1.0/24 20 SNet 197.1.1.1 2.2.2.2 0.0.0.0

Total Nets: 3

Intra Area: 2 Inter Area: 1 ASE: 0 NSSA: 0

Switch A has learned the route 152.1.1.0/24 to Area2.

2.1.5 Basic IS-IS Configuration Example

I. Network requirements

1) Requirement analysis

A small company requires that any two nodes on its network can communicate with each other. The network devices can adapt to topology changes and complete fast route convergence accordingly.

According to the requirements and actual network environment, use IS-IS to enable communication between devices.

2) Network diagram

Figure 2-5 Basic IS-IS configuration network diagram

II. Configuration procedure

# Configure Switch A.

<SwitchA> system-view

[SwitchA] isis

[SwitchA-isis] network-entity 86.0001.0000.0000.0005.00

[SwitchA] interface vlan-interface 100

[SwitchA-Vlan-interface100] ip address 100.10.0.1 255.255.255.0

[SwitchA-Vlan-interface100] isis enable

[SwitchA] interface vlan-interface 101

[SwitchA-Vlan-interface101] ip address 100.0.0.1 255.255.255.0

[SwitchA-Vlan-interface101] isis enable

[SwitchA] interface vlan-interface 102

[SwitchA-Vlan-interface102] ip address 100.20.0.1 255.255.255.0

[SwitchA-Vlan-interface102] isis enable

# Configure Switch B.

[SwitchB] isis

[SwitchB-isis] network-entity 86.0001.0000.0000.0006.00

[SwitchB] interface vlan-interface 101

[SwitchB-Vlan-interface101] ip address 200.10.0.1 255.255.255.0

[SwitchB-Vlan-interface101] isis enable

[SwitchB] interface vlan-interface 102

[SwitchB-Vlan-interface102] ip address 200.0.0.1 255.255.255.0

[SwitchB-Vlan-interface102] isis enable

[SwitchB] interface vlan-interface 100

[SwitchB-Vlan-interface100] ip address 100.10.0.2 255.255.255.0

[SwitchB-Vlan-interface100] isis enable

# Configure Switch C.

[SwitchC] isis

[SwitchC-isis] network-entity 86.0001.0000.0000.0007.00

[SwitchC] interface vlan-interface 101

[SwitchC-Vlan-interface101] ip address 200.10.0.2 255.255.255.0

[SwitchC-Vlan-interface101] isis enable

[SwitchC] interface vlan-interface 100

[SwitchC-Vlan-interface100] ip address 200.20.0.1 255.255.255.0

[SwitchC-Vlan-interface100] isis enable

# Configure Switch D.

[SwitchD] isis

[SwitchD-isis] network-entity 86.0001.0000.0000.0008.00

[SwitchD] interface vlan-interface 102

[SwitchD-Vlan-interface102] ip address 100.20.0.2 255.255.255.0

[SwitchD-Vlan-interface102] isis enable

[SwitchD] interface vlan-interface 100

[SwitchD-Vlan-interface100] ip address 100.30.0.1 255.255.255.0

[SwitchD-Vlan-interface100] isis enable

2.1.6 BGP Confederation Configuration Example

I. Network requirements

1) Requirement analysis

BGP runs in a large AS of a company. As the number of IBGP peers increases rapidly in the AS, more network resources for BGP communication are occupied. The customer hopes to reduce IBGP peers and decrease the CPU and network resources consumption of BGP without affecting device performance.

Based on user requirements, configure a BGP confederation to achieve the goal.

2) Network diagram

Figure 2-6 shows the network diagram.

Device	Interface	IP address	AS
Switch A	Vlan-int 10	172.68.10.1/24	100
	Vlan-int 50	10.1.1.1/24
Switch B	Vlan-int 10	172.68.10.2/24
Switch C	Vlan-int 10	172.68.10.3/24
	Vlan-int 20	172.68.1.1/24
	Vlan-int 30	156.10.1.1/24
Switch D	Vlan-int 20	172.68.1.2/24
Switch E	Vlan-int 30	156.10.1.2/24	200
	Vlan-int 40	8.1.1.1/24	200

Figure 2-6 Network diagram for BGP AS confederation configuration

3) Configuration plan

l Split AS 100 into three sub-ASs: AS 1001, AS 1002, and AS 1003.

l Run EBGP between AS 1001, AS1002, and AS 1003.

l AS 1001, AS1002, and AS 1003 are fully meshed within themselves by running IBGP.

l Run EBGP between AS 100 and AS 200.

II. Configuration procedure

# Configure Switch A.

<SwitchA> system-view

[SwitchA] bgp 1001

[SwitchA-bgp] network 10.1.1.0 255.255.255.0

[SwitchA-bgp] confederation id 100

[SwitchA-bgp] confederation peer-as 1002 1003

[SwitchA-bgp] group confed1002 external

[SwitchA-bgp] peer 172.68.10.2 group confed1002 as-number 1002

[SwitchA-bgp] group confed1003 external

[SwitchA-bgp] peer 172.68.10.3 group confed1003 as-number 1003

[SwitchA-bgp] quit

# Configure Switch B.

<SwitchB> system-view

[SwitchB] bgp 1002

[SwitchB-bgp] confederation id 100

[SwitchB-bgp] confederation peer-as 1001 1003

[SwitchB-bgp] group confed1001 external

[SwitchB-bgp] peer 172.68.10.1 group confed1001 as-number 1001

[SwitchB-bgp] group confed1003 external

[SwitchB-bgp] peer 172.68.10.3 group confed1003 as-number 1003

# Configure Switch C.

<SwitchC> system-view

[SwitchC] bgp 1003

[SwitchC-bgp] confederation id 100

[SwitchC-bgp] confederation peer-as 1001 1002

[SwitchC-bgp] group confed1001 external

[SwitchC-bgp] peer 172.68.10.1 group confed1001 as-number 1001

[SwitchC-bgp] group confed1002 external

[SwitchC-bgp] peer 172.68.10.2 group confed1002 as-number 1002

[SwitchC-bgp] group ebgp200 external

[SwitchC-bgp] peer 156.10.1.2 group ebgp200 as-number 200

[SwitchC-bgp] group ibgp1003 internal

[SwitchC-bgp] peer 172.68.1.2 group ibgp1003

# Configure Switch D.

<SwitchD> system-view

[SwitchD] bgp 1003

[SwitchD-bgp] confederation id 100

[SwitchD-bgp] group ibgp1003 internal

[SwitchD-bgp] peer 172.68.1.1 group ibgp1003

# Configure Switch E.

<SwitchE> system-view

[SwitchE] bgp 200

[SwitchE-bgp] network 8.1.1.0 255.255.255.0

[SwitchE-bgp] group ebgp100 external

[SwitchE-bgp] peer 156.10.1.1 group ebgp100 as-number 100

[SwitchE-bgp] quit

# Display the BGP routing table on Switch E.

[SwitchE] display bgp routing

Flags: # - valid ^ - active I - internal

D - damped H - history S - aggregate suppressed

Dest/Mask Next-Hop Med Local-pref Origin Path

--------------------------------------------------------------------------

#^ 8.1.1.0/24 0.0.0.0 0 100 IGP

#^ 10.1.1.0/24 156.10.1.1 0 100 IGP 100

Routes total: 2

# Display the BGP routing table on Switch A.

[SwitchA] display bgp routing

Flags: # - valid ^ - active I - internal

D - damped H - history S - aggregate suppressed

Dest/Mask Next-Hop Med Local-pref Origin Path

--------------------------------------------------------------------------

I 8.1.1.0/24 156.10.1.2 0 100 IGP (1003) 200

#^ 10.1.1.0/24 0.0.0.0 0 100 IGP

Routes total: 2

The above display shows that sub-AS routing information is advertised only within the confederation. A device in an AS outside of the confederation, such as Switch E, cannot learn the sub-AS routing information within the confederation because it treats the confederation as a single AS.

2.1.7 BGP Route Reflector Configuration Example

I. Network requirements

1) Requirement analysis

BGP runs in a large AS of a company. As the number of IBGP peers increases rapidly in the AS, more network resources for BGP communication are occupied. The customer hopes to reduce IBGP peers and decrease CPU and network resources consumption of BGP without affecting device performance. In addition, IBGP peers are partially interconnected in the AS.

Based on the requirements and networking environment, configure a BGP route reflector to achieve the goal.

2) Network diagram

Figure 2-7 shows the network diagram.

Device	Interface	IP address	AS
Switch A	Vlan-int 100	1.1.1.1/8	100
	Vlan-int 2	192.1.1.1/24	100
Switch B	Vlan-int 2	192.1.1.2/24	200
	Vlan-int 3	193.1.1.2/24
Switch C	Vlan-int 3	193.1.1.1/24
	Vlan-int 4	194.1.1.1/24
Switch D	Vlan-int 4	194.1.1.2/24

Figure 2-7 Network diagram for BGP route reflector configuration

3) Configuration plan

l Run EBGP between the peers in AS 100 and AS 200. Advertise network 1.0.0.0/8.

l Run IBGP between the peers in AS 200. Configure a star topology for the AS. Specify the central device as a route reflector and other devices as clients.

II. Configuration procedure

1) Configure switch A.

<SwitchA> system-view

[SwitchA] interface Vlan-interface 2

[SwitchA-Vlan-interface2] ip address 192.1.1.1 255.255.255.0

[SwitchA-Vlan-interface2] interface Vlan-interface 100

[SwitchA-Vlan-interface100] ip address 1.1.1.1 255.0.0.0

[SwitchA-Vlan-interface100] quit

[SwitchA] bgp 100

[SwitchA-bgp] group ex external

[SwitchA-bgp] peer 192.1.1.2 group ex as-number 200

[SwitchA-bgp] network 1.0.0.0 255.0.0.0

2) Configure Switch B.

# Configure the VLAN interface IP addresses.

<SwitchB> system-view

[SwitchB] interface Vlan-interface 2

[SwitchB-Vlan-interface2] ip address 192.1.1.2 255.255.255.0

[SwitchB-Vlan-interface2] quit

[SwitchB] interface Vlan-interface 3

[SwitchB-Vlan-interface3] ip address 193.1.1.2 255.255.255.0

[SwitchB-Vlan-interface3] quit

# Configure BGP peers.

[SwitchB] bgp 200

[SwitchB-bgp] group ex external

[SwitchB-bgp] peer 192.1.1.1 group ex as-number 100

[SwitchB-bgp] group in internal

[SwitchB-bgp] peer 193.1.1.1 group in

3) Configure Switch C.

# Configure the VLAN interface IP addresses.

<SwitchC> system-view

[SwitchC] interface Vlan-interface 3

[SwitchC-Vlan-interface3] ip address 193.1.1.1 255.255.255.0

[SwitchC-Vlan-interface3] quit

[SwitchC] interface vlan-Interface 4

[SwitchC-Vlan-interface4] ip address 194.1.1.1 255.255.255.0

[SwitchC-Vlan-interface4] quit

# Configure BGP peers and configure Switch C as the route reflector.

[SwitchC] bgp 200

[SwitchC-bgp] group rr internal

[SwitchC-bgp] peer rr reflect-client

[SwitchC-bgp] peer 193.1.1.2 group rr

[SwitchC-bgp] peer 194.1.1.2 group rr

4) Configure Switch D.

# Configure the VLAN interface IP address.

<SwitchD> system-view

[SwitchD] interface Vlan-interface 4

[SwitchD-Vlan-interface4] ip address 194.1.1.2 255.255.255.0

[SwitchD-Vlan-interface4] quit

# Configure the BGP peer.

[SwitchD] bgp 200

[SwitchD-bgp] group in internal

[SwitchD-bgp] peer 194.1.1.1 group in

Use the display bgp routing command to display the BGP routing table on Switch B. Note that Switch B has learned network 1.0.0.0.

Use the display bgp routing command to display the BGP routing table on Switch D. Note that Switch D has learned network 1.0.0.0.

2.1.8 BGP Path Selection Configuration Example

I. Network requirements

1) Requirement analysis

A network consists of two ASs, which run BGP to communicate with each other. OSPF runs in one of them.

The requirement is to control the data forwarding path from AS 200 to AS 100.

The following give two plans to meet the requirement

l Use the MED attribute to control the forwarding path for packets from AS 200 to AS 100.

l Use the LOCAL_PREF attribute to control the forwarding path for packets from AS 200 to AS 100

2) Network diagram

Figure 2-8 shows the network diagram.

Device	Interface	IP address	AS
Switch A	Vlan-int 101	1.1.1.1/8	100
	Vlan-int 2	192.1.1.1/24
	Vlan-int 3	193.1.1.1/24
Switch B	Vlan-int 2	192.1.1.2/24	200
	Vlan-int 4	194.1.1.2/24
Switch C	Vlan-int 3	193.1.1.2/24
	Vlan-int 5	195.1.1.2/24
Switch D	Vlan-int 4	194.1.1.1/24
	Vlan-int 5	195.1.1.1/24

Figure 2-8 Network diagram for BGP path selection

3) Configuration plan

l Run EBGP between AS 100 and AS 200. Advertise network 1.0.0.0/8.

l Run OSPF in AS 200 to realize network interconnection.

l Run IBGP between Switch D and Switch B as well as between Switch D and Switch C.

l Apply a routing policy on Switch A to modify the MED attribute of the route to be advertised to AS 200, making the data forwarding path from Switch D to AS 100 as Switch D – Switch C – Switch A.

l Apply a routing policy on Switch C to modify the LOCAL_PREF attribute of the route to be advertised to Switch D, making the data forwarding path from AS 200 to AS 100 as Switch D – Switch C – Switch A.

II. Configuration procedure

1) Configure Switch A.

# Configure the VLAN interface IP addresses.

<SwitchA> system-view

[SwitchA] interface Vlan-interface 2

[SwitchA-Vlan-interface2] ip address 192.1.1.1 255.255.255.0

[SwitchA-Vlan-interface2] quit

[SwitchA] interface Vlan-interface 3

[SwitchA-Vlan-interface3] ip address 193.1.1.1 255.255.255.0

[SwitchA-Vlan-interface3] quit

[SwitchA] interface Vlan-interface 101

[SwitchA-Vlan-interface101] ip address 1.1.1.1 255.0.0.0

[SwitchA-Vlan-interface101] quit

# Enable BGP.

[SwitchA] bgp 100

# Advertise network 1.0.0.0/8.

[SwitchA-bgp] network 1.0.0.0

# Configure BGP peers.

[SwitchA-bgp] group ex192 external

[SwitchA-bgp] peer 192.1.1.2 group ex192 as-number 200

[SwitchA-bgp] group ex193 external

[SwitchA-bgp] peer 193.1.1.2 group ex193 as-number 200

[SwitchA-bgp] quit

# Define ACL 2000 to permit the routes destined for 1.0.0.0/8.

[SwitchA] acl number 2000

[SwitchA-acl-basic-2000] rule permit source 1.0.0.0 0.255.255.255

[SwitchA-acl-basic-2000] rule deny source any

[SwitchA-acl-basic-2000] quit

# Create a routing policy named apply_med_50, and specify node 10 with the permit matching mode for the routing policy. Set the MED value of the route matching ACL 2000 to 50.

[SwitchA] route-policy apply_med_50 permit node 10

[SwitchA-route-policy] if-match acl 2000

[SwitchA-route-policy] apply cost 50

[SwitchA-route-policy] quit

# Create a routing policy named apply_med_100, and specify node 10 with the permit matching mode for the routing policy. Set the MED value of the route matching ACL 2000 to 100.

[SwitchA] route-policy apply_med_100 permit node 10

[SwitchA-route-policy] if-match acl 2000

[SwitchA-route-policy] apply cost 100

[SwitchA-route-policy] quit

# Apply the routing policy apply_med_50 to routing updates to the peer group ex193 (the peer 193.1.1.2) and apply_med_100 to routing updates to the peer group ex192 (the peer 192.1.1.2).

[SwitchA] bgp 100

[SwitchA-bgp] peer ex193 route-policy apply_med_50 export

[SwitchA-bgp] peer ex192 route-policy apply_med_100 export

2) Configure Switch B.

# Configure the VLAN interface IP addresses.

<SwitchB> system-view

[SwitchB] interface vlan 2

[SwitchB-Vlan-interface2] ip address 192.1.1.2 255.255.255.0

[SwitchB-Vlan-interface2] quit

[SwitchB] interface Vlan-interface 4

[SwitchB-Vlan-interface4] ip address 194.1.1.2 255.255.255.0

[SwitchB-Vlan-interface4] quit

# Configure OSPF.

[SwitchB] ospf

[SwitchB-ospf-1] area 0

[SwitchB-ospf-1-area-0.0.0.0] network 194.1.1.0 0.0.0.255

[SwitchB-ospf-1-area-0.0.0.0] network 192.1.1.0 0.0.0.255

[SwitchB-ospf-1-area-0.0.0.0] quit

[SwitchB-ospf-1] quit

# Enable BGP, create a peer group, and add peers to the peer group.

[SwitchB] bgp 200

[SwitchB-bgp] undo synchronization

[SwitchB-bgp] group ex external

[SwitchB-bgp] peer 192.1.1.1 group ex as-number 100

[SwitchB-bgp] group in internal

[SwitchB-bgp] peer 194.1.1.1 group in

[SwitchB-bgp] peer 195.1.1.2 group in

3) Configure Switch C.

# Configure the VLAN interface IP addresses.

<SwitchC> system-view

[SwitchC] interface Vlan-interface 3

[SwitchC-Vlan-interface3] ip address 193.1.1.2 255.255.255.0

[SwitchC-Vlan-interface3] quit

[SwitchC] interface Vlan-interface 5

[SwitchC-Vlan-interface5] ip address 195.1.1.2 255.255.255.0

[SwitchC-Vlan-interface5] quit

# Enable OSPF.

[SwitchC] ospf

[SwitchC-ospf-1] area 0

[SwitchC-ospf-1-area-0.0.0.0] network 193.1.1.0 0.0.0.255

[SwitchC-ospf-1-area-0.0.0.0] network 195.1.1.0 0.0.0.255

[SwitchC-ospf-1-area-0.0.0.0] quit

[SwitchC-ospf-1] quit

# Enable BGP, create a peer group, and add peers to the peer group.

[SwitchC] bgp 200

[SwitchC-bgp] undo synchronization

[SwitchC-bgp] group ex external

[SwitchC-bgp] peer 193.1.1.1 group ex as-number 100

[SwitchC-bgp] group in internal

[SwitchC-bgp] peer 195.1.1.1 group in

[SwitchC-bgp] peer 194.1.1.2 group in

4) Configure Switch D.

# Configure the VLAN interface IP addresses.

<SwitchD> system-view

[SwitchD] interface Vlan-interface 4

[SwitchD-Vlan-interface4] ip address 194.1.1.1 255.255.255.0

[SwitchD-Vlan-interface4] quit

[SwitchD] interface Vlan-interface 5

[SwitchD-Vlan-interface5] ip address 195.1.1.1 255.255.255.0

[SwitchD-Vlan-interface5] quit

# Enable OSPF.

[SwitchD] ospf

[SwitchD-ospf-1] area 0

[SwitchD-ospf-1-area-0.0.0.0] network 194.1.1.0 0.0.0.255

[SwitchD-ospf-1-area-0.0.0.0] network 195.1.1.0 0.0.0.255

[SwitchD-ospf-1-area-0.0.0.0] network 4.0.0.0 0.255.255.255

[SwitchD-ospf-1-area-0.0.0.0] quit

[SwitchD-ospf-1] quit

# Enable BGP, create a peer group, and add peers to the peer group.

[SwitchD] bgp 200

[SwitchD-bgp] undo synchronization

[SwitchD-bgp] group in internal

[SwitchD-bgp] peer 195.1.1.2 group in

[SwitchD-bgp] peer 194.1.1.2 group in

l To validate the configuration, you need to use the reset bgp all command on all the BGP peers.

l Since the MED attribute of route 1.0.0.0 learned by Switch C is smaller than that learned by Switch B, Switch D selects the route 1.0.0.0 from Switch C.

l If you do not configure MED attribute control on Switch A, setting the local preference attribute for route 1.0.0.0 on Switch C is another choice.

# Define ACL 2000 to permit the routes destined for 1.0.0.0/8.

[SwitchC] acl number 2000

[SwitchC-acl-basic-2000] rule permit source 1.0.0.0 0.255.255.255

[SwitchC-acl-basic-2000] rule deny source any

[SwitchC-acl-basic-2000] quit

# Create a routing policy named localpref, and specify node 10 with the permit matching mode for the routing policy. Set the local preference value of the route matching ACL 2000 to 200

[SwitchC] route-policy localpref permit node 10

[SwitchC-route-policy] if-match acl 2000

[SwitchC-route-policy] apply local-preference 200

[SwitchC-route-policy] quit

# Create a routing policy named localpref, and specify node 20 with the permit matching mode for the routing policy. Set the local preference value of the route to 100.

[SwitchC] route-policy localpref permit node 20

[SwitchC-route-policy] apply local-preference 100

[SwitchC-route-policy] quit

# Apply the routing policy localpref to the routing information from the peer 193.1.1.1 (Switch A).

[SwitchC] bgp 200

[SwitchC-bgp] peer 193.1.1.1 route-policy localpref import

Since the local preference (200) of the route learned by Switch C is bigger than that learned by Switch B (100), Switch D prefers the route 1.0.0.0 from Switch C. Note that the local preference is not set for route 1.0.0.0 on Switch B, so the route uses the default value 100.

Chapter 3 Comprehensive Configuration Example

& Note:

l For details about routing protocols, see corresponding operation manuals of products.

l For detailed commands, see corresponding command manuals of products.

l The S3600, S5600 and S7500 series switches are used in the following examples.

3.1 Network Requirements

3.1.1 Requirement Analysis, Network Diagram and Configuration Plan

I. Requirement analysis

An ISP has four ASs: AS 100, AS 200, AS 300, and AS 400. AS 100 is the core layer. It connects AS 200, AS 300, and AS 400 and forwards data between them. AS 200, AS 300, and AS 400 constitutes the distribution layer. They provide access services for users. The specific requirements are as follows:

l Fast convergence is required for AS 200 and AS 400 because their networks are quite large and complicated.

l The network of AS 300 is small and simple. The devices in the network supports only RIP. Their performances are low and the capacities of routing tables are quite limited.

l Access users in AS 200 require a very reliable network.

l Access users in AS 200, AS 300, and AS 400 are accessible to each other.

l S200_10 in AS 200 is connected with Layer 2 devices.

l S300_B in AS 300 is connected with Layer 2 devices.

l The data forwarding path needs to be controlled when users in AS 400 access AS 200 and AS 300.

l An AS 300 access user is interconnected with the ISP through a single link.

II. Network diagram

Figure 3-1 shows the network diagram designed according to the requirements.

Figure 3-1 Network diagram

III. Configuration plan

l Run BGP in AS 100 to interconnect with AS 200, AS 300, and AS 400. Use the MED attribute to control the forwarding path.

l Run OSPF in AS 200. The device in AS 200 connecting to AS 100 runs both OSPF and BGP. Use static routes as backup routes to implement link redundancy and improve network reliability. Apply a routing policy when redistributing BGP routes for filtering.

l Run OSPF in AS 400. The device in AS 400 connecting to AS 100 runs both OSPF and BGP. Apply a routing policy when redistributing BGP routes for filtering.

l Run RIPv2 in AS 300. The device in AS 300 connecting to AS 100 runs both RIPv2 and BGP. Apply a routing policy when redistributing BGP routes for filtering.

l AS 300 users use the combination of static routes, RIP, and routing policy to access the ISP.

l Interaction between IGP and BGP is involved in the configuration. Since the default BGP preference is 256, when backup routes exist in the routing table, you need to modify the BGP preference in order to select the primary route as required.

3.1.2 Devices Used for Networking

Table 3-1 Device model and device name

Model	Device name
7500	S100_1/S100_2
5600	S200/S300/S400
3600	S200_0/S200_10/S300_A/S300_B/ S400_0

& Note:

l Either S7500 series Ethernet switches or S5600 series Ethernet switches can serve as S100_1/S100_2/S400/S200/S300.

l You can use other partially layer 3 capable switches as S300_B.

3.1.3 Routing Protocols and Related Parameters on Devices

Table 3-2 Routing protocols supported by devices

Device name	Routing protocol	Router ID	AS
S100_1	BGP (IBGP&EBGP)	1.1.1.1	100
S100_2	BGP (IBGP&EBGP)	1.2.1.1	100
S200	BGP (EBGP)/OSPF	2.1.1.1	200
S200_0	OSPF	—
S200_10	OSPF/STATIC	—
S300	BGP (EBGP)/RIPv2	3.1.1.1	300
S300_A	RIPv2/STATIC	—
S300_B	RIPv2	—
S400	BGP (EBGP)/OSPF	4.1.1.1	400
S400_0	OSPF	—	400

3.1.4 Software Version

S3600 series Ethernet switches use Release 1510.

S5600 series Ethernet switches use Release 1510.

S7500 series Ethernet switches use Release 3135.

3.2 Configuration Procedure

3.2.1 Configuration Guide

Table 3-3 Configuration guide

Configuration task	Description
Basic Configuration	Create VLANs and configure IP addresses for VLAN interfaces
Basic RIPv2/OSPF/BGP Configuration	Basic RIPv2/OSPF/BGP configuration
RIP, Static Route, and Routing Policy Configuration Example	Using a routing policy, configure RIP to advertise route updates but does not receive route updates and use static routing to access the ISP.
BGP and IGP Interaction Configuration Example	IGP and BGP share routes. Apply a routing policy for BGP redistribution to IGP as required
Route Backup Configuration Example	To improve network reliability, run OSPF on the primary link and run static routing on the backup link to realize interconnection
BGP MED Attribute Configuration Example	Apply a routing policy to change the MED attribute of routes to control the forwarding path

3.2.2 Basic Configuration

Creating VLANs and configuring IP addresses for VLAN interfaces are omitted here, refer to Displaying the Whole Configuration on Devices for related information.

3.2.3 Basic RIPv2/OSPF/BGP Configuration

I. Basic RIPv2 configuration

Figure 3-2 shows the relevant network diagram of AS 300.

Device	Interface	IP address
S300	Vlan-int 14	206.1.4.2/24
S300_A	Vlan-int 14	206.1.4.1/24
	Vlan-int 662	166.1.2.1/24
	Vlan-int 665	166.1.5.2/24
S300_B	Vlan-int 662	166.1.2.2/24
	Vlan-int 623	162.1.3.1/24
	Vlan-int 624	162.1.4.1/24

Figure 3-2 Network diagram for RIPv2 configuration

l Configure S300.

# Run RIP on the interface with the IP address 206.1.4.0.

<S300> system-view

[S300] rip

[S300-rip] network 206.1.4.0

# Disable RIPv2 route summarization.

[S300-rip] undo summary

[S300-rip] quit

# Run RIPv2 on VLAN-interface 14.

[S300] interface vlan-interface 14

[S300-Vlan-interface14] rip version 2

[S300-Vlan-interface14] quit

l Configure S300_A.

# Run RIP on the interfaces on networks 206.1.4.0 and 166.1.0.0.

<S300_A> system-view

[S300_A] rip

[S300_A-rip] network 206.1.4.0

[S300_A-rip] network 166.1.0.0

# Disable RIPv2 route summarization.

[S300_A-rip] undo summary

[S300_A-rip] quit

# Run RIPv2 on VLAN-interface 14 and VLAN-interface 662.

[S300_A] interface vlan-interface 14

[S300_A-Vlan-interface14] rip version 2

[S300_A-Vlan-interface14] quit

[S300_A] interface vlan-interface 662

[S300_A-Vlan-interface662] rip version 2

[S300_A-Vlan-interface662] quit

l Configure S300_B.

# Run RIP on the interfaces connected to networks 162.1.0.0 and 166.1.0.0.

<S300_B> system-view

[S300_B] rip

[S300_B-rip] network 162.1.0.0

[S300_B-rip] network 166.1.0.0

# Disable RIPv2 route summarization.

[S300_B-rip] undo summary

[S300_B-rip] quit

# Run RIPv2 on VLAN-interface 623, VLAN-interface 624, and VLAN-interface 662.

[S300_B] interface vlan-interface 623

[S300_B-Vlan-interface623] rip version 2

[S300_B-Vlan-interface623] quit

[S300_B] interface vlan-interface 624

[S300_B-Vlan-interface624] rip version 2

[S300_B-Vlan-interface624] quit

[S300_B] interface vlan-interface 662

[S300_B-Vlan-interface662] rip version 2

[S300_B-Vlan-interface662] quit

II. Basic OSPF configuration

Figure 3-3 shows the relevant network diagram of AS 200.

Device	Interface	IP address	Area
S200	Vlan-int 12	206.1.2.3/24	0
S200_0	Vlan-int 12	206.1.2.1/24	0
	Vlan-int 661	166.1.1.1/24	10
S200_10	Vlan-int 661	166.1.1.2/24	10
	Vlan-int 621	162.1.1.1/24	10
	Vlan-int 622	162.1.2.1/24	10

Figure 3-3 Network diagram for OSPF configuration

l Configure S200.

# Run OSPF on the interface connected to network 206.1.2.0/24 and specify its area ID as 0.

<S200> system-view

[S200] ospf

[S200-ospf-1] area 0

[S200-ospf-1-area-0.0.0.0] network 206.1.2.0 0.0.0.255

l Configure S200_0.

# Run OSPF on the interface connected to network 206.1.2.0/24 and specify its area ID as 0.

<S200_0> system-view

[S200_0] ospf

[S200_0-ospf-1] area 0

[S200_0-ospf-1-area-0.0.0.0] network 206.1.2.0 0.0.0.255

[S200_0-ospf-1-area-0.0.0.0] quit

# Run OSPF on the interface connected to network 166.1.1.0/24 and specify its area ID as 10.

[S200_0-ospf-1] area 10

[S200_0-ospf-1-area-0.0.0.10] network 166.1.1.0 0.0.0.255

l Configure S200_10.

# Run OSPF on interfaces connected to networks 162.1.1.0/24, 162.1.2.0/24, and 166.1.1.0/24 and specify their area ID as 10.

<S200_10> system-view

[S200_10] ospf

[S200_10-ospf-1] area 10

[S200_10-ospf-1-area-0.0.0.10] network 162.1.1.0 0.0.0.255

[S200_10-ospf-1-area-0.0.0.10] network 162.1.2.0 0.0.0.255

[S200_10-ospf-1-area-0.0.0.10] network 166.1.1.0 0.0.0.255

Figure 3-4 shows the network diagram of AS 400.

Device	Interface	IP address	Area
S400	Vlan-int 16	206.1.6.3/24	0
S400_0	Vlan-int 16	206.1.6.1/24	0
	Vlan-int 663	166.1.3.1/24	0.0.1.44
	Vlan-int 664	166.1.4.1/24	0.0.1.44

Figure 3-4 Network diagram for AS 400 configuration

l Configure S400.

# Run OSPF on the interface connected to network 206.1.6.0/24 and specify its area ID as 0.

<S400> system-view

[S400] ospf

[S400-ospf-1] area 0

[S400-ospf-1-area-0.0.0.0] network 206.1.6.0 0.0.0.255

l Configure S400_0.

# Run OSPF on the interface connected to network 206.1.6.0/24 and specify its area ID as 0.

<S400_0> system-view

[S400_0] ospf

[S400_0-ospf-1] area 0

[S400_0-ospf-1-area-0.0.0.0] network 206.1.6.0 0.0.0.255

[S400_0-ospf-1-area-0.0.0.0] quit

# Run OSPF on interfaces connected to networks 166.1.3.0/24 and 166.1.4.0/24 and specify their area ID as 0.0.1.44.

[S400_0-ospf-1] area 0.0.1.44

[S400_0-ospf-1-area-0.0.1.44] network 166.1.3.0 0.0.0.255

[S400_0-ospf-1-area-0.0.1.44] network 166.1.4.0 0.0.0.255

III. Basic BGP configuration

Figure 3-5 shows the relevant network diagram.

Device	Interface	IP address	Router ID	AS
S100_1	Vlan-int 11	196.1.1.1/24	1.1.1.1	100
	Vlan-int 15	196.1.3.1/24
	Vlan-int 31	196.3.1.1/24
S100_2	Vlan-int 22	196.2.2.1/24	1.2.1.1
	Vlan-int 23	196.2.3.2/24
	Vlan-int 31	196.3.1.2/24
S200	Vlan-int 11	196.1.1.3/24	2.1.1.1	200
	Vlan-int 13	206.1.3.3/24		200
S300	Vlan-int 22	196.2.2.2/24	3.1.1.1	300
	Vlan-int 13	206.1.3.2/24		300
S400	Vlan-int 15	196.1.3.3/24	4.1.1.1	400
	Vlan-int 23	196.2.3.3/24		400

Figure 3-5 Network diagram for BGP configuration

l Configure S100_1.

# Configure the router ID of S100_1 as 1.1.1.1.

<S100_1> system-view

[S100_1] router id 1.1.1.1

# Enable BGP and specify the local AS number as 100.

[S100_1] bgp 100

# Create IBGP peer group 100 and EBGP peer groups 200 and 400.

[S100_1-bgp] group 100 internal

[S100_1-bgp] group 200 external

[S100_1-bgp] group 400 external

# Add peer 196.3.1.2 in AS 100 into peer group 100; Add peer 196.1.1.3 in AS 200 into peer group 200; Add peer 196.1.3.3 in AS 400 into peer group 400.

[S100_1-bgp] peer 196.3.1.2 group 100

[S100_1-bgp] peer 196.1.1.3 group 200 as-number 200

[S100_1-bgp] peer 196.1.3.3 group 400 as-number 400

# Advertise networks 196.1.3.0, 196.3.1.0, and 196.1.1.0.

[S100_1-bgp] network 196.1.3.0

[S100_1-bgp] network 196.3.1.0

[S100_1-bgp] network 196.1.1.0

# Set the preferences of EBGP routes, IBGP routes, and local routes to 200.

[S100_1-bgp] preference 200 200 200

l Configure S100_2.

# Configure the router ID of S200_2 as 1.2.1.1.

<S100_2> system-view

[S100_2] router id 1.2.1.1

# Enable BGP and specify the local AS number as 100.

[S100_2] bgp 100

# Create IBGP peer group 100 and EBGP peer groups 300 and 400.

[S100_2-bgp] group 100 internal

[S100_2-bgp] group 300 external

[S100_2-bgp] group 400 external

# Add peer 196.3.1.1 in AS 100 into peer group 100; Add peer 196.2.2.2 in AS 300 into peer group 300; Add peer 196.2.3.3 in AS 400 into peer group 400.

[S100_2-bgp] peer 196.3.1.1 group 100

[S100_2-bgp] peer 196.2.2.2 group 300 as-number 300

[S100_2-bgp] peer 196.2.3.3 group 400 as-number 400

# Advertise networks 196.2.2.0, 196.2.3.0, and 196.3.1.0.

[S100_2-bgp] network 196.2.2.0

[S100_2-bgp] network 196.2.3.0

[S100_2-bgp] network 196.3.1.0

# Set the preferences of EBGP routes, IBGP routes, and local routes to 200.

[S100_2-bgp] preference 200 200 200

l Configure S200.

# Configure the router ID of S200 as 2.1.1.1.

<S200> system-view

[S200] router id 2.1.1.1

# Enable BGP and specify the local AS number as 200.

[S200] bgp 200

# Create EBGP peer groups 100 and 300.

[S200-bgp] group 100 external

[S200-bgp] group 300 external

# Add peer 196.1.1.1 in AS 100 into peer group 100; Add peer 206.1.3.2 in AS 300 into peer group 300.

[S200-bgp] peer 196.1.1.1 group 100 as-number 100

[S200-bgp] peer 206.1.3.2 group 300 as-number 300

# Advertise networks 192.1.1.0 and 206.1.3.0.

[S200-bgp] network 192.1.1.0

[S200-bgp] network 206.1.3.0

# Set the preferences of EBGP routes, IBGP routes, and local routes to 200.

[S200-bgp] preference 200 200 200

l Configure S300.

# Configure the router ID of S300 as 3.1.1.1.

<S300> system-view

[S300] router id 3.1.1.1

# Enable BGP and specify the local AS number as 300.

[S300] bgp 300

# Create EBGP peer groups 100 and 200.

[S300-bgp] group 100 external

[S300-bgp] group 200 external

# Add peer 196.2.2.1 in AS 100 into peer group 100; Add peer 206.1.3.3 in AS 200 into peer group 200.

[S300-bgp] peer 196.2.2.1 group 100 as-number 100

[S300-bgp] peer 206.1.3.3 group 200 as-number 200

# Advertise networks 206.1.3.0 and 196.2.2.0.

[S300-bgp] network 206.1.3.0

[S300-bgp] network 196.2.2.0

# Set the preferences of EBGP routes, IBGP routes, and local routes to 200.

[S300-bgp] preference 200 200 200

l Configure S400.

# Configure the router ID of S400 as 4.1.1.1.

<S400> system-view

[S400] router id 4.1.1.1

# Enable BGP and specify the local AS number as 400.

[S400] bgp 400

# Create EBGP peer groups 100_1 and 100_2.

[S400-bgp] group 100_1 external

[S400-bgp] group 100_2 external

# Add peer 196.1.3.1 in AS 100 into peer group 100_1; Add peer 196.2.3.2 in AS 100 into peer group 100_2.

[S400-bgp] peer 196.1.3.1 group 100_1 as-number 100

[S400-bgp] peer 196.2.3.2 group 100_2 as-number 100

# Advertise networks 196.1.3.0 and 196.2.3.0.

[S400-bgp] network 196.1.3.0

[S400-bgp] network 196.2.3.0

# Set the preferences of EBGP routes, IBGP routes, and local routes to 200.

[S400-bgp] preference 200 200 200

3.2.4 RIP, Static Route, and Routing Policy Configuration Example

I. Network requirements

As shown in Figure 3-6, RIPv2 runs on S300_A/S300_B. To control the number of routes learned by S300_B through RIP, allow S300_B to advertise routes to S300_A and forbid S300_B to receive routes advertised by S300_A. Packets from S300_B to S300_A are forwarded through the default route.

II. Network diagram

Device	Interface	IP address
S300_A	Vlan-int 662	166.1.2.1/24
S300_B	Vlan-int 662	166.1.2.2/24
	Vlan-int 623	162.1.3.1/24
	Vlan-int 624	162.1.4.1/24

Figure 3-6 Network diagram for RIP, static route, and routing policy configuration

III. Configuration procedure

# Create ACL 2000 and deny all packets.

<S300_B> system-view

[S300_B] acl number 2000

[S300_B-acl-basic-2000] rule deny source any

[S300_B-acl-basic-2000] quit

# Apply ACL 2000 to incoming RIP routes.

[S300_B] rip

[S300_B-rip] filter-policy 2000 import

# Configure a default route and specify the next-hop IP address as 166.1.2.1.

[S300_B] ip route-static 0.0.0.0 0.0.0.0 166.1.2.1 preference 60

3.2.5 BGP and IGP Interaction Configuration Example

I. Network requirements

As shown in Figure 3-7, OSPF and BGP run on S400/S200. RIPv2 and BGP run on S300. To ensure that devices in each AS can learn network topologies of other ASs, configure interaction between IGP and BGP to share routes. When redistributing routes from IGP to BGP, apply a routing policy to redistribute routes with IP prefixes 162.1.1.0/24, 162.1.2.0/24, 162.1.3.0/24, 162.1.4.0/24, 166.1.3.0/24, and 166.1.4.0/24 only.

II. Network diagram

Figure 3-7 Network diagram for BGP and IGP interaction

III. Configuration procedure

l Configure interaction between IGP and BGP on S200.

# Redistribute OSPF routes into BGP.

<S200> system-view

[S200] bgp 200

[S200-bgp] import-route ospf 1

[S200-bgp] quit

# Define a prefix list named ospf_import and permit the routes with IP prefixes 162.1.3.0/24, 162.1.4.0/24, 166.1.3.0/24, or 166.1.4.0/24.

[S200] ip ip-prefix ospf_import index 10 permit 162.1.3.0 24

[S200] ip ip-prefix ospf_import index 20 permit 162.1.4.0 24

[S200] ip ip-prefix ospf_import index 30 permit 166.1.4.0 24

[S200] ip ip-prefix ospf_import index 40 permit 166.1.3.0 24

# Create a routing policy named ospf_import with the match mode as permit. Define an if-match clause to permit routes whose destination addresses match IP prefix list ospf_import.

[S200] route-policy ospf_import permit node 10

[S200-route-policy] if-match ip-prefix ospf_import

[S200-route-policy] quit

# Redistribute BGP routes into OSPF and apply routing policy ospf_import.

[S200] ospf

[S200-ospf-1] import-route bgp route-policy ospf_import

l Configure interaction between IGP and BGP on S300.

# Redistribute RIP routes into BGP.

<S300> system-view

[S300] bgp 300

[S300-bgp] import-route rip

[S300-bgp] quit

# Define a prefix list named rip_import and permit the routes with IP prefixes 162.1.1.0/24, 162.1.2.0/24, 166.1.3.0/24, and 166.1.4.0/24.

[S300] ip ip-prefix rip_import index 10 permit 162.1.1.0 24

[S300] ip ip-prefix rip_import index 20 permit 162.1.2.0 24

[S300] ip ip-prefix rip_import index 30 permit 166.1.3.0 24

[S300] ip ip-prefix rip_import index 40 permit 166.1.4.0 24

# Create a routing policy named rip_import with the matching mode as permit. Define an if-match clause to permit routes whose destination addresses match IP prefix list rip_import.

[S300] route-policy rip_import permit node 10

[S300-route-policy] if-match ip-prefix rip_import

[S300-route-policy] quit

# Redistribute BGP routes into RIP and apply routing policy rip_import.

[S300] rip

[S300-rip] import-route bgp route-policy rip_import

l Configure interaction between IGP and BGP on S400.

# Redistribute OSPF routes into BGP.

<S400> system-view

[S400] bgp 400

[S400-bgp] import-route ospf 1

[S400-bgp] quit

# Define a prefix list named ospf_import and permit the routes with IP prefixes 162.1.1.0/24, 162.1.2.0/24, 162.1.3.0/24, and 162.1.4.0/24.

[S400] ip ip-prefix ospf_import index 10 permit 162.1.1.0 24

[S400] ip ip-prefix ospf_import index 20 permit 162.1.2.0 24

[S400] ip ip-prefix ospf_import index 30 permit 162.1.3.0 24

[S400] ip ip-prefix ospf_import index 40 permit 162.1.4.0 24

# Create a routing policy named ospf_import with the match mode as permit. Define an if-match clause to permit the routes whose destination addresses match IP prefix list ospf_import.

[S400] route-policy ospf_import permit node 10

[S400-route-policy] if-match ip-prefix ospf_import

[S400-route-policy] quit

# Redistribute BGP routes into OSPF and apply the routing policy named ospf_import.

[S400] ospf

[S400-ospf-1] import-route bgp route-policy ospf_import

3.2.6 Route Backup Configuration Example

I. Network requirements

As shown in Figure 3-8, implement route backup on S200_10. Run OSPF between S200_10 and S200_0. The OSPF route is the primary route. Configure a default route between S200_10 and S300_A. This route is the backup route. When the primary route cannot work, the device switches to the backup route automatically. When the primary route becomes feasible, the device switches to the primary route automatically. To achieve the route backup of S200_10, configure a static route to S200_10 on S300_A and redistribute this route into RIPv2.

II. Network diagram

Device	Interface	IP address	AS
S300_A	Vlan-int 665	166.1.5.2/24	300
S200_10	Vlan-int 665	166.1.5.1/24	200
	Vlan-int 621	162.1.1.1/24
	Vlan-int 622	162.1.2.1/24

Figure 3-8 Network diagram for route backup

III. Configuration procedure

# Configure a default route on S200_10 and specify the next-hop IP address as 166.1.5.2. Set the default preference to 200.

<S200_10> system-view

[S200_10] ip route-static 0.0.0.0 0.0.0.0 166.1.5.2 preference 200

# Configure a static route on S300_A and specify the destination IP addresses as 162.1.1.0/24 and 162.1.2.0/24. Specify the next-hop IP address as 166.1.5.1 and the default preference to 200.

<S300_A> system-view

[S300_A] ip route-static 162.1.1.0 255.255.255.0 166.1.5.1 preference 200

[S300_A] ip route-static 162.1.2.0 255.255.255.0 166.1.5.1 preference 200

# Redistribute the static route into RIP.

[S300_A] rip

[S300_A-rip] import-route static

3.2.7 BGP MED Attribute Configuration Example

I. Network requirements

As shown in Figure 3-9, S100_1 forwards packets from S400 to S200_10. S100_2 forwards packets from S400 to S300_B. Modify the MED value to achieve this goal.

II. Network diagram

Device	Interface	IP address	AS
S200_10	Vlan-int 621	162.1.1.1/24	200
	Vlan-int 622	162.1.2.1/24	200
S300_B	Vlan-int 623	162.1.3.1/24	300
	Vlan-int 624	162.1.4.1/24	300
S400_0	Vlan-int 663	166.1.3.1/24	400
	Vlan-int 664	166.1.4.1/24	400

Figure 3-9 Network diagram for MED attribute configuration

III. Configuration procedure

l Configure S100_1.

# Define a prefix list named as200_1 and permit the route with IP prefix 162.1.1.0/24.

<S100_1> system-view

[S100_1] ip ip-prefix as200_1 index 10 permit 162.1.1.0 24

# Define a prefix list named as200_2 and permit the route with IP prefix 162.1.2.0/24.

[S100_1] ip ip-prefix as200_2 index 10 permit 162.1.2.0 24

# Define a prefix list named as300_1 and permit the route with IP prefix 162.1.3.0/24.

[S100_1] ip ip-prefix as300_1 index 10 permit 162.1.3.0 24

# Define a prefix list named as300_2 and permit the route with IP prefix 162.1.4.0/24.

[S100_1] ip ip-prefix as300_2 index 10 permit 162.1.4.0 24

# Define a prefix list named other and permit all the routes.

[S100_1] ip ip-prefix other index 10 permit 0.0.0.0 0 less-equal 32

# Create a routing policy named as200, and specify node 10 with the permit matching mode in the routing policy. Set the MED value of the route matching prefix list as200_1 to 100.

[S100_1] route-policy as200 permit node 10

[S100_1-route-policy] if-match ip-prefix as200_1

[S100_1-route-policy] apply cost 100

[S100_1-route-policy] quit

# Create node 20 with the matching mode as permit in routing policy as200. Set the MED value of the route matching prefix list as200_2 to 100

[S100_1] route-policy as200 permit node 20

[S100_1-route-policy] if-match ip-prefix as200_2

[S100_1-route-policy] apply cost 100

[S100_1-route-policy] quit

# Create node 30 with the permit matching mode in routing policy as200. Set the MED value of the route matching prefix list as300_1 to 200.

[S100_1] route-policy as200 permit node 30

[S100_1-route-policy] if-match ip-prefix as300_1

[S100_1-route-policy] apply cost 200

[S100_1-route-policy] quit

# Create node 40 with the permit matching mode in routing policy as200. Set the MED value of the route matching prefix list as300_2 to 200.

[S100_1] route-policy as200 permit node 40

[S100_1-route-policy] if-match ip-prefix as300_2

[S100_1-route-policy] apply cost 200

[S100_1-route-policy] quit

# Create node 50 with the permit matching mode in routing policy as200. Permit all the routes.

[S100_1] route-policy as200 permit node 50

[S100_1-route-policy] if-match ip-prefix other

[S100_1-route-policy] quit

# Apply the routing policy as200 to the routes outgoing to peer group 400 (the peer 196.1.3.3).

[S100_1] bgp 100

[S100_1-bgp] peer 400 route-policy as200 export

l Configure S100_2.

# Define a prefix list named as200_1 and permit the route with IP prefix 162.1.1.0/24.

<S100_2> system-view

[S100_2] ip ip-prefix as200_1 index 10 permit 162.1.1.0 24

# Define a prefix list named as200_2 and permit the route with IP prefix 162.1.2.0/24.

[S100_2] ip ip-prefix as200_2 index 10 permit 162.1.2.0 24

# Define a prefix list named as300_1 and permit the route with IP prefix 162.1.3.0/24.

[S100_2] ip ip-prefix as300_1 index 10 permit 162.1.3.0 24

# Define a prefix list named as300_2 and permit the route with IP prefix 162.1.4.0/24.

[S100_2] ip ip-prefix as300_2 index 10 permit 162.1.4.0 24

# Define a prefix list named other and permit all the routes.

[S100_2] ip ip-prefix other index 10 permit 0.0.0.0 0 less-equal 32

# Create a routing policy named as300. Configure the node number as 10 and the matching mode as permit. Set the MED value of the route matching prefix list as200_1 to 200.

[S100_2] route-policy as300 permit node 10

[S100_2-route-policy] if-match ip-prefix as200_1

[S100_2-route-policy] apply cost 200

[S100_2-route-policy] quit

# Create node 20 with the permit matching mode in routing policy as300. Set the MED value of the route matching prefix list as200_2 to 200.

[S100_2] route-policy as300 permit node 20

[S100_2-route-policy] if-match ip-prefix as200_2

[S100_2-route-policy] apply cost 200

[S100_2-route-policy] quit

# Create node 30 with the permit matching mode in routing policy as300. Set the MED value of the route matching prefix list as300_1 to 100.

[S100_2] route-policy as300 permit node 30

[S100_2-route-policy] if-match ip-prefix as300_1

[S100_2-route-policy] apply cost 100

[S100_2-route-policy] quit

# Create node 40 with the permit matching mode in routing policy as300. Set the MED value of the route matching prefix list as300_2 to 100.

[S100_2] route-policy as300 permit node 40

[S100_2-route-policy] if-match ip-prefix as300_2

[S100_2-route-policy] apply cost 100

[S100_2-route-policy] quit

# Create node 50 with the permit matching mode in routing policy as300 and permit all routes.

[S100_2] route-policy as300 permit node 50

[S100_2-route-policy] if-match ip-prefix other

[S100_2-route-policy] quit

# Apply routing policy as300 to the routes outgoing to peer group 400 (peer 196.2.3.3).

[S100_2] bgp 100

[S100_2-bgp] peer 400 route-policy as300 export

3.3 Displaying the Whole Configuration on Devices

3.3.1 Displaying the Whole Configuration on Devices

I. S100_1

<S100_1> display current-configuration

sysname S100_1

router id 1.1.1.1

….

vlan 11

vlan 15

vlan 31

interface Vlan-interface11

ip address 196.1.1.1 255.255.255.0

interface Vlan-interface15

ip address 196.1.3.1 255.255.255.0

interface Vlan-interface31

ip address 196.3.1.1 255.255.255.0

…

bgp 100

network 196.1.3.0

network 196.3.1.0

network 196.1.1.0

undo synchronization

group 100 internal

peer 196.3.1.2 group 100

group 200 external

peer 196.1.1.3 group 200 as-number 200

group 400 external

peer 400 route-policy as200 export

peer 196.1.3.3 group 400 as-number 400

preference 200 200 200

route-policy as200 permit node 10

if-match ip-prefix as200_1

apply cost 100

route-policy as200 permit node 20

if-match ip-prefix as200_2

apply cost 100

route-policy as200 permit node 30

if-match ip-prefix as300_1

apply cost 200

route-policy as200 permit node 40

if-match ip-prefix as300_2

apply cost 200

route-policy as200 permit node 50

if-match ip-prefix other

ip ip-prefix as200_1 index 10 permit 162.1.1.0 24

ip ip-prefix as200_2 index 10 permit 162.1.2.0 24

ip ip-prefix as300_1 index 10 permit 162.1.3.0 24

ip ip-prefix as300_2 index 10 permit 162.1.4.0 24

ip ip-prefix other index 10 permit 0.0.0.0 0 less-equal 32

…

II. S100_2

<S100_2> display current-configuration

sysname S100_2

router id 1.2.1.1

……

vlan 22

vlan 23

vlan 31

interface Vlan-interface22

ip address 196.2.2.1 255.255.255.0

interface Vlan-interface23

ip address 196.2.3.2 255.255.255.0

interface Vlan-interface31

ip address 196.3.1.2 255.255.255.0

…

bgp 100

network 196.2.2.0

network 196.2.3.0

network 196.3.1.0

undo synchronization

group 100 internal

peer 196.3.1.1 group 100

group 300 external

peer 196.2.2.2 group 300 as-number 300

group 400 external

peer 400 route-policy as300 export

peer 196.2.3.3 group 400 as-number 400

preference 200 200 200

route-policy as300 permit node 10

if-match ip-prefix as200_1

apply cost 200

route-policy as300 permit node 20

if-match ip-prefix as200_2

apply cost 200

route-policy as300 permit node 30

if-match ip-prefix as300_1

apply cost 100

route-policy as300 permit node 40

if-match ip-prefix as300_2

apply cost 100

route-policy as300 permit node 50

if-match ip-prefix other

ip ip-prefix as200_1 index 10 permit 162.1.1.0 24

ip ip-prefix as200_2 index 10 permit 162.1.2.0 24

ip ip-prefix as300_1 index 10 permit 162.1.3.0 24

ip ip-prefix as300_2 index 10 permit 162.1.4.0 24

ip ip-prefix other index 10 permit 0.0.0.0 0 less-equal 32

…..

III. S200

<S200> display current-configuration

sysname S200

……

router id 2.1.1.1

………..

vlan 11

vlan 12

vlan 13

interface Vlan-interface11

ip address 196.1.1.3 255.255.255.0

interface Vlan-interface12

ip address 206.1.2.3 255.255.255.0

interface Vlan-interface13

ip address 206.1.3.3 255.255.255.0

…….

undo fabric-port Cascade1/2/1 enable

undo fabric-port Cascade1/2/2 enable

interface NULL0

bgp 200

network 192.1.1.0

network 206.1.3.0

import-route ospf 1

undo synchronization

group 100 external

peer 196.1.1.1 group 100 as-number 100

group 300 external

peer 206.1.3.2 group 300 as-number 300

preference 200 200 200

ospf 1

import-route bgp route-policy ospf_import

area 0.0.0.0

network 206.1.2.0 0.0.0.255

route-policy ospf_import permit node 10

if-match ip-prefix ospf_import

ip ip-prefix ospf_import index 10 permit 162.1.3.0 24

ip ip-prefix ospf_import index 20 permit 162.1.4.0 24

ip ip-prefix ospf_import index 30 permit 166.1.4.0 24

ip ip-prefix ospf_import index 40 permit 166.1.3.0 24

……

IV. S200_0

<S200_0> display current-configuration

sysname S200_0

…….

vlan 12

vlan 661

interface Vlan-interface12

ip address 206.1.2.1 255.255.255.0

interface Vlan-interface661

ip address 166.1.1.1 255.255.255.0

…….

ospf 1

area 0.0.0.10

network 166.1.1.0 0.0.0.255

area 0.0.0.0

network 206.1.2.0 0.0.0.255

……….

V. S200_10

<S200_10> display current-configuration

sysname S200_10

…….

vlan 621 to 622

vlan 661

vlan 665

interface Vlan-interface621

ip address 162.1.1.1 255.255.255.0

interface Vlan-interface622

ip address 162.1.2.1 255.255.255.0

interface Vlan-interface661

ip address 166.1.1.2 255.255.255.0

interface Vlan-interface665

ip address 166.1.5.1 255.255.255.0

………

ospf 1

area 0.0.0.10

network 162.1.1.0 0.0.0.255

network 162.1.2.0 0.0.0.255

network 166.1.1.0 0.0.0.255

ip route-static 0.0.0.0 0.0.0.0 166.1.5.2 preference 200

………

VI. S300

<S300> display current-configuration

sysname S300

router id 3.1.1.1

…..

vlan 13

vlan 14

vlan 22

interface Vlan-interface13

ip address 206.1.3.2 255.255.255.0

interface Vlan-interface14

ip address 206.1.4.2 255.255.255.0

rip version 2 multicast

interface Vlan-interface22

ip address 196.2.2.2 255.255.255.0

……

undo fabric-port Cascade1/2/1 enable

undo fabric-port Cascade1/2/2 enable

interface NULL0

bgp 300

network 206.1.3.0

network 196.2.2.0

import-route rip

undo synchronization

group 100 external

peer 196.2.2.1 group 100 as-number 100

group 200 external

peer 206.1.3.3 group 200 as-number 200

preference 200 200 200

rip

undo summary

network 206.1.4.0

import-route bgp route-policy rip_import

route-policy rip_import permit node 10

if-match ip-prefix rip_import

ip ip-prefix rip_import index 10 permit 162.1.1.0 24

ip ip-prefix rip_import index 20 permit 162.1.2.0 24

ip ip-prefix rip_import index 30 permit 166.1.3.0 24

ip ip-prefix rip_import index 40 permit 166.1.4.0 24

………

VII. S300_A

<S300_A> display current-configuration

sysname S300_A

……

vlan 14

vlan 662

vlan 665

interface Vlan-interface14

ip address 206.1.4.1 255.255.255.0

rip version 2 multicast

interface Vlan-interface662

ip address 166.1.2.1 255.255.255.0

rip version 2 multicast

interface Vlan-interface665

ip address 166.1.5.2 255.255.255.0

……

rip

undo summary

network 206.1.4.0

network 166.1.0.0

import-route static

ip route-static 162.1.1.0 255.255.255.0 166.1.5.1 preference 200

ip route-static 162.1.2.0 255.255.255.0 166.1.5.1 preference 200

………

VIII. S300_B

<S300_B> display current-configuration

sysname S300_B

……

acl number 2000

rule 5 deny

……

vlan 623

vlan 624

vlan 662

interface Vlan-interface623

ip address 162.1.3.1 255.255.255.0

rip version 2 multicast

interface Vlan-interface624

ip address 162.1.4.1 255.255.255.0

rip version 2 multicast

interface Vlan-interface662

ip address 166.1.2.2 255.255.255.0

rip version 2 multicast

……

rip

undo summary

network 166.1.0.0

network 162.1.0.0

filter-policy 2000 import

ip route-static 0.0.0.0 0.0.0.0 166.1.2.1 preference 60

……

IX. S400

<S400> display current-configuration

sysname S400

router id 4.1.1.1

……

vlan 15 to 16

vlan 23

interface Vlan-interface15

ip address 196.1.3.3 255.255.255.0

interface Vlan-interface16

ip address 206.1.6.3 255.255.255.0

interface Vlan-interface23

ip address 196.2.3.3 255.255.255.0

……

undo fabric-port Cascade1/2/1 enable

undo fabric-port Cascade1/2/2 enable

interface NULL0

bgp 400

network 196.1.3.0

network 196.2.3.0

import-route ospf 1

undo synchronization

group 100_1 external

peer 196.1.3.1 group 100_1 as-number 100

group 100_2 external

peer 196.2.3.2 group 100_2 as-number 100

preference 200 200 200

ospf 1

import-route bgp route-policy ospf_import

area 0.0.0.0

network 206.1.6.0 0.0.0.255

route-policy ospf_import permit node 10

if-match ip-prefix ospf_import

ip as-path-acl 1 permit ^100 200$

ip as-path-acl 2 permit ^100 300$

ip ip-prefix ospf_import index 10 permit 162.1.1.0 24

ip ip-prefix ospf_import index 20 permit 162.1.2.0 24

ip ip-prefix ospf_import index 30 permit 162.1.3.0 24

ip ip-prefix ospf_import index 40 permit 162.1.4.0 24

…..

X. S400_0

<S400_0> display current-configuration

sysname S400_0

………

vlan 16

vlan 663 to 664

………

interface Vlan-interface16

ip address 206.1.6.1 255.255.255.0

interface Vlan-interface663

ip address 166.1.3.1 255.255.255.0

interface Vlan-interface664

ip address 166.1.4.1 255.255.255.0

………

ospf 1

area 0.0.1.44

network 166.1.3.0 0.0.0.255

network 166.1.4.0 0.0.0.255

area 0.0.0.0

network 206.1.6.0 0.0.0.255

………

3.4 Verifying the Configuration

3.4.1 Verifying the Configuration of Routing Policy and Static Routes

<S300_B> display ip routing-table

Routing Table: public net

Destination/Mask Protocol Pre Cost Nexthop Interface

0.0.0.0/0 STATIC 60 0 166.1.2.1 Vlan-interface662

127.0.0.0/8 DIRECT 0 0 127.0.0.1 InLoopBack0

127.0.0.1/32 DIRECT 0 0 127.0.0.1 InLoopBack0

162.1.3.0/24 DIRECT 0 0 162.1.3.1 Vlan-interface623

162.1.3.1/32 DIRECT 0 0 127.0.0.1 InLoopBack0

162.1.4.0/24 DIRECT 0 0 162.1.4.1 Vlan-interface624

162.1.4.1/32 DIRECT 0 0 127.0.0.1 InLoopBack0

166.1.2.0/24 DIRECT 0 0 166.1.2.2 Vlan-interface662

166.1.2.2/32 DIRECT 0 0 127.0.0.1 InLoopBack0

<S300_B> tracert -a 162.1.3.1 166.1.4.1

traceroute to 166.1.4.1(166.1.4.1) 30 hops max,40 bytes packet

1 166.1.2.1 18 ms 3 ms 3 ms

2 206.1.4.2 9 ms 4 ms 4 ms

3 196.2.2.1 9 ms 9 ms 18 ms

4 196.2.3.3 6 ms 3 ms 4 ms

5 206.1.6.1 14 ms 4 ms 3 ms

3.4.2 Verifying the BGP and IGP Interaction Configuration

<S400_0> display ip routing-table

Routing Table: public net

Destination/Mask Protocol Pre Cost Nexthop Interface

127.0.0.0/8 DIRECT 0 0 127.0.0.1 InLoopBack0

127.0.0.1/32 DIRECT 0 0 127.0.0.1 InLoopBack0

162.1.1.0/24 O_ASE 150 1 206.1.6.3 Vlan-interface16

162.1.2.0/24 O_ASE 150 1 206.1.6.3 Vlan-interface16

162.1.3.0/24 O_ASE 150 1 206.1.6.3 Vlan-interface16

162.1.4.0/24 O_ASE 150 1 206.1.6.3 Vlan-interface16

166.1.3.0/24 DIRECT 0 0 166.1.3.1 Vlan-interface663

166.1.3.1/32 DIRECT 0 0 127.0.0.1 InLoopBack0

166.1.4.0/24 DIRECT 0 0 166.1.4.1 Vlan-interface664

166.1.4.1/32 DIRECT 0 0 127.0.0.1 InLoopBack0

192.168.0.0/24 DIRECT 0 0 192.168.0.30 Vlan-interface1

192.168.0.30/32 DIRECT 0 0 127.0.0.1 InLoopBack0

206.1.6.0/24 DIRECT 0 0 206.1.6.1 Vlan-interface16

206.1.6.1/32 DIRECT 0 0 127.0.0.1 InLoopBack0

<S300_A> display ip routing-table

Routing Table: public net

Destination/Mask Protocol Pre Cost Nexthop Interface

127.0.0.0/8 DIRECT 0 0 127.0.0.1 InLoopBack0

127.0.0.1/32 DIRECT 0 0 127.0.0.1 InLoopBack0

162.1.1.0/24 RIP 100 1 206.1.4.2 Vlan-interface14

162.1.2.0/24 RIP 100 1 206.1.4.2 Vlan-interface14

162.1.3.0/24 RIP 100 1 166.1.2.2 Vlan-interface662

162.1.4.0/24 RIP 100 1 166.1.2.2 Vlan-interface662

166.1.2.0/24 DIRECT 0 0 166.1.2.1 Vlan-interface662

166.1.2.1/32 DIRECT 0 0 127.0.0.1 InLoopBack0

166.1.3.0/24 RIP 100 1 206.1.4.2 Vlan-interface14

166.1.4.0/24 RIP 100 1 206.1.4.2 Vlan-interface14

166.1.5.0/24 DIRECT 0 0 166.1.5.2 Vlan-interface665

166.1.5.2/32 DIRECT 0 0 127.0.0.1 InLoopBack0

206.1.4.0/24 DIRECT 0 0 206.1.4.1 Vlan-interface14

206.1.4.1/32 DIRECT 0 0 127.0.0.1 InLoopBack0

<S200_10> display ip routing-table

Routing Table: public net

Destination/Mask Protocol Pre Cost Nexthop Interface

0.0.0.0/0 STATIC 200 0 166.1.5.2 Vlan-interface665

127.0.0.0/8 DIRECT 0 0 127.0.0.1 InLoopBack0

127.0.0.1/32 DIRECT 0 0 127.0.0.1 InLoopBack0

162.1.1.0/24 DIRECT 0 0 162.1.1.1 Vlan-interface621

162.1.1.1/32 DIRECT 0 0 127.0.0.1 InLoopBack0

162.1.2.0/24 DIRECT 0 0 162.1.2.1 Vlan-interface622

162.1.2.1/32 DIRECT 0 0 127.0.0.1 InLoopBack0

162.1.3.0/24 O_ASE 150 1 166.1.1.1 Vlan-interface661

162.1.4.0/24 O_ASE 150 1 166.1.1.1 Vlan-interface661

166.1.1.0/24 DIRECT 0 0 166.1.1.2 Vlan-interface661

166.1.1.2/32 DIRECT 0 0 127.0.0.1 InLoopBack0

166.1.3.0/24 O_ASE 150 1 166.1.1.1 Vlan-interface661

166.1.4.0/24 O_ASE 150 1 166.1.1.1 Vlan-interface661

166.1.5.0/24 DIRECT 0 0 166.1.5.1 Vlan-interface665

166.1.5.1/32 DIRECT 0 0 127.0.0.1 InLoopBack0

206.1.2.0/24 OSPF 10 20 166.1.1.1 Vlan-interface661

3.4.3 Verifying the Route Backup Configuration

I. Verify the primary route is installed into the routing table

<S200_10> display ip routing-table

Routing Table: public net

Destination/Mask Protocol Pre Cost Nexthop Interface

0.0.0.0/0 STATIC 200 0 166.1.5.2 Vlan-interface665

127.0.0.0/8 DIRECT 0 0 127.0.0.1 InLoopBack0

127.0.0.1/32 DIRECT 0 0 127.0.0.1 InLoopBack0

162.1.1.0/24 DIRECT 0 0 162.1.1.1 Vlan-interface621

162.1.1.1/32 DIRECT 0 0 127.0.0.1 InLoopBack0

162.1.2.0/24 DIRECT 0 0 162.1.2.1 Vlan-interface622

162.1.2.1/32 DIRECT 0 0 127.0.0.1 InLoopBack0

162.1.3.0/24 O_ASE 150 1 166.1.1.1 Vlan-interface661

162.1.4.0/24 O_ASE 150 1 166.1.1.1 Vlan-interface661

166.1.1.0/24 DIRECT 0 0 166.1.1.2 Vlan-interface661

166.1.1.2/32 DIRECT 0 0 127.0.0.1 InLoopBack0

166.1.3.0/24 O_ASE 150 1 166.1.1.1 Vlan-interface661

166.1.4.0/24 O_ASE 150 1 166.1.1.1 Vlan-interface661

166.1.5.0/24 DIRECT 0 0 166.1.5.1 Vlan-interface665

166.1.5.1/32 DIRECT 0 0 127.0.0.1 InLoopBack0

206.1.2.0/24 OSPF 10 20 166.1.1.1 Vlan-interface661

<S200_10> tracert -a 162.1.1.1 166.1.3.1

traceroute to 166.1.3.1(166.1.3.1) 30 hops max,40 bytes packet

1 166.1.1.1 10 ms 3 ms 3 ms

2 206.1.2.3 13 ms 3 ms 5 ms

3 196.1.1.1 9 ms 3 ms 4 ms

4 196.1.3.3 12 ms 3 ms 3 ms

5 206.1.6.1 14 ms 5 ms 3 ms

II. Verify the backup route is installed into the routing table after the primary one fails

<S200_10> display ip routing-table

Routing Table: public net

Destination/Mask Protocol Pre Cost Nexthop Interface

0.0.0.0/0 STATIC 200 0 166.1.5.2 Vlan-interface665

127.0.0.0/8 DIRECT 0 0 127.0.0.1 InLoopBack0

127.0.0.1/32 DIRECT 0 0 127.0.0.1 InLoopBack0

162.1.1.0/24 DIRECT 0 0 162.1.1.1 Vlan-interface621

162.1.1.1/32 DIRECT 0 0 127.0.0.1 InLoopBack0

162.1.2.0/24 DIRECT 0 0 162.1.2.1 Vlan-interface622

162.1.2.1/32 DIRECT 0 0 127.0.0.1 InLoopBack0

166.1.5.0/24 DIRECT 0 0 166.1.5.1 Vlan-interface665

166.1.5.1/32 DIRECT 0 0 127.0.0.1 InLoopBack0

<S200_10> tracert -a 162.1.1.1 166.1.3.1

traceroute to 166.1.3.1(166.1.3.1) 30 hops max,40 bytes packet

1 166.1.5.2 11 ms 3 ms 4 ms

2 206.1.4.2 13 ms 3 ms 4 ms

3 196.2.2.1 13 ms 3 ms 6 ms

4 196.2.3.3 11 ms 3 ms 4 ms

5 206.1.6.1 12 ms 3 ms 4 ms

3.4.4 Verifying the MED Attribute Configuration

I. Trace the packet forwarding path when the default MED is used

<S400_0> tracert -a 166.1.3.1 162.1.1.1

traceroute to 162.1.1.1(162.1.1.1) 30 hops max,40 bytes packet

1 206.1.6.3 11 ms 3 ms 7 ms

2 196.1.3.1 10 ms 3 ms 8 ms

3 196.1.1.3 8 ms 3 ms 3 ms

4 206.1.2.1 13 ms 4 ms 3 ms

5 166.1.1.2 13 ms 4 ms 3 ms

<S400_0> tracert -a 166.1.3.1 162.1.3.1

traceroute to 162.1.3.1(162.1.3.1) 30 hops max,40 bytes packet

1 206.1.6.3 11 ms 3 ms 3 ms

2 196.1.3.1 14 ms 4 ms 5 ms

3 196.3.1.2 10 ms 8 ms 17 ms

4 196.2.2.2 14 ms 3 ms 3 ms

5 206.1.4.1 13 ms 3 ms 3 ms

6 166.1.2.2 13 ms 3 ms 4 ms

II. Trace the packet forwarding path after the MED is modified

# Create AS path ACL 1 and permit the routes whose AS_PATH starts with 100 and ends with 200.

[S400] ip as-path-acl 1 permit ^100 200$

# Display the routes that match AS path ACL 1.

<S400> display bgp routing as-path-acl 1

Flags: # - valid ^ - active I - internal

D - damped H - history S - aggregate suppressed

Dest/Mask Next-Hop Med Local-pref Origin Path ----------------------------------------------------------------------

#^ 162.1.1.0/24 196.1.3.1 100 100 INC 100 200

# 162.1.1.0/24 196.2.3.2 200 100 INC 100 200

#^ 162.1.2.0/24 196.1.3.1 100 100 INC 100 200

# 162.1.2.0/24 196.2.3.2 200 100 INC 100 200

#^ 166.1.1.0/24 196.1.3.1 0 100 INC 100 200

# 166.1.1.0/24 196.2.3.2 0 100 INC 100 200

#^ 206.1.3.0 196.1.3.1 0 100 IGP 100 200

# Create AS path ACL 2 and permit the routes whose AS_PATH starts with 100 and ends with 300.

[S400] ip as-path-acl 2 permit ^100 300$

# Display the routes that match AS path ACL 2.

<S400> display bgp routing as-path-acl 2

Flags: # - valid ^ - active I - internal

D - damped H - history S - aggregate suppressed

Dest/Mask Next-Hop Med Local-pref Origin Path ----------------------------------------------------------------------

#^ 162.1.3.0/24 196.2.3.2 100 100 INC 100 300

# 162.1.3.0/24 196.1.3.1 200 100 INC 100 300

#^ 162.1.4.0/24 196.2.3.2 100 100 INC 100 300

# 162.1.4.0/24 196.1.3.1 200 100 INC 100 300

#^ 166.1.2.0/24 196.1.3.1 0 100 INC 100 300

# 166.1.2.0/24 196.2.3.2 0 100 INC 100 300

#^ 166.1.5.0/24 196.1.3.1 0 100 INC 100 300

# 166.1.5.0/24 196.2.3.2 0 100 INC 100 300

# 206.1.3.0 196.2.3.2 0 100 IGP 100 300

<S400_0> tracert -a 166.1.3.1 162.1.1.1

traceroute to 162.1.1.1(162.1.1.1) 30 hops max,40 bytes packet

1 206.1.6.3 9 ms 4 ms 3 ms

2 196.1.3.1 13 ms 4 ms 3 ms

3 196.1.1.3 14 ms 4 ms 3 ms

4 206.1.2.1 12 ms 3 ms 3 ms

5 166.1.1.2 13 ms 4 ms 3 ms

<S400_0> tracert -a 166.1.3.1 162.1.3.1

traceroute to 162.1.3.1(162.1.3.1) 30 hops max,40 bytes packet

1 206.1.6.3 10 ms 4 ms 3 ms

2 196.2.3.2 13 ms 3 ms 5 ms

3 196.2.2.2 12 ms 5 ms 3 ms

4 206.1.4.1 12 ms 4 ms 3 ms

5 166.1.2.2 14 ms 3 ms 5 ms

3.5 Precautions

In the configuration and verification process, pay attention to the following points:

l Disable the Fabric function before enabling BGP on Fabric-capable devices.

l To achieve the configuration goal, you are recommended to set the BGP preference to 200. For devices with static routes configured, set a preference for the static routes as required.

l On S300_A, the backup route (static route) cannot be switched to the primary RIP route automatically, so you need to delete the backup route manually and then add it again.

l Since the routing policy is applied when BGP routes are redistributed into IGP, some route entries may not be redistributed, so you are recommended to use the tracert –a /ping –a command to verify the configuration in the source address mode.

H3C S7500 Series Ethernet Switches Configuration Examples Release 3135(V1.00)

I. Static routing

II. RIP

III. OSPF

IV. IS-IS

V. BGP

V. Configuring RIP route summarization

IX. Enabling load sharing among RIP interfaces

X. Configuring RIP to redistribute routes from another protocol

VI. Configuring OSPF Route Summarization

1.2.5 ISIS Configuration

IV. Enabling Default Route Advertising

I. Network requirements

II. Configuration procedure

I. Network requirements

II. Configuration procedure

I. Network requirements

II. Configuration procedure

I. Network requirements

II. Configuration procedure

I. Network requirements

II. Configuration procedure

I. Network requirements

II. Configuration procedure

I. Network requirements

II. Configuration procedure

I. Network requirements

II. Configuration procedure

I. Requirement analysis

II. Network diagram

III. Configuration plan

I. Basic RIPv2 configuration

II. Basic OSPF configuration

III. Basic BGP configuration

I. Network requirements

II. Network diagram

III. Configuration procedure

I. Network requirements

II. Network diagram

III. Configuration procedure

I. Network requirements

II. Network diagram

III. Configuration procedure