Table of Contents

Chapter 1 IPv6 IS-IS Configuration. 1-1

1.1 Introduction to IPv6 IS-IS. 1-1

1.2 Configuring IPv6 IS-IS Basic Functions. 1-2

1.2.1 Configuration Prerequisites. 1-2

1.2.2 Configuration Procedure. 1-2

1.3 Configuring IPv6 IS-IS Routing Information Control 1-3

1.3.1 Configuration Prerequisites. 1-3

1.3.2 Configuration Procedure. 1-3

1.4 Displaying and Maintaining IPv6 IS-IS Configuration. 1-4

1.5 IPv6 IS-IS Configuration Example. 1-5

 

Chapter 1  IPv6 IS-IS Configuration

 

 

When configuring IPv6 IS-IS, go to these sections for information you are interested in:

l           Introduction to IPv6 IS-IS

l           Configuring IPv6 IS-IS Basic Functions

l           Configuring IPv6 IS-IS Routing Information Control

l           Displaying and Maintaining IPv6 IS-IS

l           IPv6 IS-IS Configuration Example

1.1  Introduction to IPv6 IS-IS

The IS-IS routing protocol (Intermediate System-to-Intermediate System intra-domain routing information exchange protocol) supports multiple network protocols, including IPv6. IS-IS with IPv6 support is called IPv6 IS-IS dynamic routing protocol. The International Engineer Task Force (IETF) defines two Type-Length-Values (TLVs) and a new Network Layer Protocol Identifier (NLPID) to enable IPv6 support for IS-IS.

TLV is a variable field in the Link State PDU or Link State Packet (LSP). The two TLVs are:

l           IPv6 Reachability: Defines the prefix, metric of routing information to indicate the network reachability, with a type value of 236 (0xEC).

l           IPv6 Interface Address: Similar with the “IP Interface Address” TLV of IPv4, it transforms the 32-bit IPv4 address to the 128-bit IPv6 address.

NLPID is an 8-bit field with a value of 142 (0x8E), which indicates the network layer protocol packet. If the IS-IS router supports IPv6, the advertised routing information must be marked with the NLPID.

For information about IS-IS, refer to IS-IS Configuration in IP Routing Volume.

1.2  Configuring IPv6 IS-IS Basic Functions

 

 

1.2.1  Configuration Prerequisites

Before the configuration, accomplish the following tasks first:

l           Enable IPv6 globally

l           Configure IP addresses for interfaces, and make sure all neighboring nodes are reachable.

l           Enable IS-IS

1.2.2  Configuration Procedure

Follow these steps to configure the basic functions of IPv6 IS-IS:

To do…	Use command to…	Remarks
Enter system view	system-view	––
Enable an IS-IS process and enter IS-IS view	isis [ process-id ] [ vpn-instance vpn-instance-name ]	Required Not enabled by default
Configure the network entity title for the IS-IS process	network-entity net	Required Not configured by default
Enable IPv6 for the IS-IS process	ipv6 enable	Required Disabled by default
Return to system view	quit	––
Enter interface view	interface interface-type interface-number	––
Enable IPv6 for an IS-IS process on the interface	isis ipv6 enable [ process-id ]	Required Disabled by default

 

1.3  Configuring IPv6 IS-IS Routing Information Control

1.3.1  Configuration Prerequisites

You need to complete the IPv6 IS-IS basic function configuration before configuring this task.

1.3.2  Configuration Procedure

Follow these steps to configure IPv6 IS-IS routing information control:

To do…	Use command to…	Remarks
Enter system view	system-view	––
Enter IS-IS view	isis [ process-id ] [ vpn-instance vpn-instance-name ]	––
Define the priority for IPv6 IS-IS routes	ipv6 preference { route-policy route-policy-name | preference } *	Optional 15 by default
Configure an IPv6 IS-IS summary route	ipv6 summary ipv6-prefix prefix-length [ avoid-feedback | generate_null0_route | [ level-1 | level-1-2 | level-2 ] | tag tag ] *	Optional Not configured by default
Generate an IPv6 IS-IS default route	ipv6 default-route-advertise [ [ level-1 | level-2 | level-1-2 ] | route-policy route-policy-name ]*	Optional No IPv6 default route is defined by default.
Configure IPv6 IS-IS to filter incoming routes	ipv6 filter-policy { acl6-number | ipv6-prefix ipv6-prefix-name | route-policy route-policy-name } import	Optional No filtering policy is defined by default
Configure IPv6 IS-IS to redistribute routes from another routing protocol	ipv6 import-route protocol [ process-id ] [ allow-ibgp ] [ cost cost-value | [ level-1 | level-2 | level-1-2 ] | route-policy route-policy-name | tag tag-value ] *	Optional Not configured by default
Configure a filter policy to filter outgoing redistributed routes	ipv6 filter-policy { acl6-number | ipv6-prefix ipv6-prefix-name | route-policy route-policy-name } export [ protocol process-id ]	Optional Not configured by default
Enable route leaking	ipv6 import-route isisv6 level-2 into level-1 [ filter-policy { acl6-number | ipv6-prefix ipv6-prefix-name | route-policy route-policy-name } | tag tag ]*	Optional Not enabled by default
Specify the maximum number of equal-cost load balanced routes	ipv6 maximum load-balancing number	Optional

 

 

1.4  Displaying and Maintaining IPv6 IS-IS Configuration

To do…	Use the command…	Remarks
Display brief IPv6 IS-IS information	display isis brief	Available in any view
Display the status of the debug switches	display isis interface [ verbose ] [ process-id | vpn-instance vpn-instance-name ]	Available in any view
Display IS-IS enabled interface information	display isis interface [ verbose ] [ process-id | vpn-instance vpn-instance-name ]	Available in any view
Display IS-IS license information	display isis license	Available in any view
Display LSDB information	display isis lsdb [ [ l1 | l2 | level-1 | level-2 ] | [ [ lsp-id lsp-id | lsp-name lspname | local ] | verbose ] * ] * [ process-id | vpn-instance vpn-instance-name ]	Available in any view
Display IS-IS mesh group information	display isis mesh-group [ process-id | vpn-instance vpn-instance-name ]	Available in any view
Display the mapping table between the host name and system ID	display isis name-table [ process-id | vpn-instance vpn-instance-name ]	Available in any view
Display IS-IS neighbor information	display isis peer [ verbose ] [ process-id | vpn-instance vpn-instance-name]	Available in any view
Display IPv6 IS-IS routing information	display isis route ipv6 [ [ level-1 | level-2 ] | verbose ] * [ process-id ]	Available in any view
Display SPF log information	display isis spf-log [ process-id | vpn-instance vpn-instance-name ]	Available in any view
Display the statistics of the IS-IS process	display isis statistics [ level-1 | level-2 | level-1-2 ] [ process-id | [ vpn-instance vpn-instance-name ]	Available in any view
Clear all IS-IS data structure information	reset isis all [ process-id | vpn-instance vpn-instance-name ]	Available in user view
Clear the IS-IS data information of a neighbor	reset isis peer system-id [ process-id | vpn vpn-instance-name ]	Available in user view

 

1.5  IPv6 IS-IS Configuration Example

I. Network requirements

As shown in Figure 1-1, Switch A, Switch B, Switch C and Switch D reside in the same autonomous system, and all are enabled with IPv6. Run IPv6 IS-IS to interconnect them.

Switch A and Switch B are Level-1 switches, Switch D is a Level-2 switch, and Switch C is a Level-1-2 switch. Switch A, Switch B, and Switch C are in area 10, while Switch D is in area 20.

II. Network diagram

Figure 1-1 Network diagram for IPv6 IS-IS basic configuration

III. Configuration procedure

1)         Configure IPv6 addresses for interfaces (omitted)

2)         Configure IPv6 IS-IS

# Configure Switch A.

<SwitchA> system-view

[SwitchA] isis 1

[SwitchA-isis-1] is-level level-1

[SwitchA-isis-1] network-entity 10.0000.0000.0001.00

[SwitchA-isis-1] ipv6 enable

[SwitchA-isis-1] quit

[SwitchA] interface vlan-interface 100

[SwitchA-Vlan-interface100] isis ipv6 enable 1

[SwitchA-Vlan-interface100] quit

# Configure Switch B.

<SwitchB> system-view

[SwitchB] isis 1

[SwitchB-isis-1] is-level level-1

[SwitchB-isis-1] network-entity 10.0000.0000.0002.00

[SwitchB-isis-1] ipv6 enable

[SwitchB-isis-1] quit

[SwitchB] interface vlan-interface 200

[SwitchB-Vlan-interface200] isis ipv6 enable 1

[SwitchB-Vlan-interface200] quit

# Configure Switch C.

<SwitchC> system-view

[SwitchC] isis 1

[SwitchC-isis-1] network-entity 10.0000.0000.0003.00

[SwitchC-isis-1] ipv6 enable

[SwitchC-isis-1] quit

[SwitchC] interface vlan-interface 100

[SwitchC-Vlan-interface100] isis ipv6 enable 1

[SwitchC-Vlan-interface100] quit

[SwitchC] interface vlan-interface 200

[SwitchC-Vlan-interface200] isis ipv6 enable 1

[SwitchC-Vlan-interface200] quit

[SwitchC] interface vlan-interface 300

[SwitchC-Vlan-interface300] isis ipv6 enable 1

[SwitchC-Vlan-interface300] quit

# Configure Switch D.

<SwitchD> system-view

[SwitchD] isis 1

[SwitchD-isis-1] is-level level-2

[SwitchD-isis-1] network-entity 20.0000.0000.0004.00

[SwitchD-isis-1] ipv6 enable

[SwitchD-isis-1] quit

[SwitchD] interface vlan-interface 300

[SwitchD-Vlan-interface300] isis ipv6 enable 1

[SwitchD-Vlan-interface300] quit

[SwitchD] interface vlan-interface 301

[SwitchD-Vlan-interface301] isis ipv6 enable 1

[SwitchD-Vlan-interface301] quit