Contents

Basic IP forwarding commands· 1

display fib· 1

inner-interface learn arp-nd· 3

ip last-hop backup enable· 3

ip last-hop hold· 4

Load sharing commands· 6

ip load-sharing local-first enable· 6

ip load-sharing mode· 6

 

Basic IP forwarding commands

display fib

Use display fib to display FIB entries.

Syntax

display fib [ vpn-instance vpn-instance-name ] [ ip-address [ mask | mask-length ] ]

Views

Any view

Predefined user roles

network-admin

network-operator

context-admin

context-operator

Parameters

vpn-instance vpn-instance-name: Specifies an MPLS L3VPN instance by its name, a case-sensitive string of 1 to 31 characters. To display the FIB entries for the public network, do not specify any VPN instance.

ip-address: Displays the FIB entry that matches the specified destination IP address.

mask: Specifies the mask for the IP address.

mask-length: Specifies the mask length for the IP address. The value range is 0 to 32.

Usage guidelines

If you specify an IP address without a mask or mask length, this command displays the longest matching FIB entry.

If you specify an IP address and a mask or mask length, this command displays the exactly matching FIB entry.

Examples

# Display all FIB entries of the public network.

<Sysname> display fib

 

Destination count: 5 FIB entry count: 5

 

Flag:

  U:Useable   G:Gateway   H:Host   B:Blackhole   D:Dynamic   S:Static

  R:Relay     F:FRR

 

Destination/Mask   Nexthop         Flag     OutInterface/Token       Label

0.0.0.0/32         127.0.0.1       UH       InLoop0                  Null

192.168.100.0/24   192.168.100.96  U        GE1/0/0                  Null

127.0.0.0/8        127.0.0.1       U        InLoop0                  Null

127.0.0.0/32       127.0.0.1       UH       InLoop0                  Null

127.0.0.1/32       127.0.0.1       UH       InLoop0                  Null

# Display the FIB entries for VPN vpn1.

<Sysname> display fib vpn-instance vpn1

Destination count: 6 FIB entry count: 6

 

Flag:

  U:Useable   G:Gateway   H:Host   B:Blackhole   D:Dynamic   S:Static

  R:Relay     F:FRR

 

Destination/Mask   Nexthop         Flag     OutInterface/Token      Label

0.0.0.0/32         127.0.0.1       UH       InLoop0                  Null

20.20.20.0/24      20.20.20.25     U        GE1/0/0                Null

20.20.20.0/32      20.20.20.25     UBH      GE1/0/0                Null

20.20.20.25/32     127.0.0.1       UH       InLoop0                  Null

20.20.20.25/32     20.20.20.25     H        GE1/0/0                Null

20.20.20.255/32    20.20.20.25     UBH      GE1/0/0                Null

# Display the FIB entries matching the destination IP address 10.2.1.1.

<Sysname> display fib 10.2.1.1

 

Destination count: 1 FIB entry count: 1

 

Flag:

  U:Useable   G:Gateway   H:Host   B:Blackhole   D:Dynamic   S:Static

  R:Relay     F:FRR

 

Destination/Mask   Nexthop         Flag     OutInterface/Token       Label

10.2.1.1/32        127.0.0.1       UH       InLoop0                  Null

Table 1 Command output

Field	Description
Destination count	Total number of destination addresses.
FIB entry count	Total number of FIB entries.
Destination/Mask	Destination address and the mask length.
Nexthop	Next hop address.
Flag	Flags of routes: ·     U—Usable route. ·     G—Gateway route. ·     H—Host route. ·     B—Blackhole route. ·     D—Dynamic route. ·     S—Static route. ·     R—Relay route. ·     F—Fast reroute.
OutInterface/Token	Output interface/LSP index number.
Label	Inner label.

 

inner-interface learn arp-nd

Use inner-interface learn arp-nd to enable ARP and ND entry learning on inner interfaces

Use undo inner-interface learn arp-nd to disable ARP and ND entry learning on inner interfaces.

Syntax

inner-interface learn arp-nd vlan vlan-id

undo inner-interface learn arp-nd

Default

ARP and ND entry learning is disabled on inner interfaces.

Views

System view

Predefined user roles

network-admin

context-admin

Parameters

vlan vlan-id: Specifies a VLAN by its ID in the range of 2 to 4094. The specified VLAN must be a VLAN terminated on an inner subinterface and cannot be the default VLAN ID of the peer inner interface.

Usage guidelines

You must enable this feature if NetStream statistics are sent out by inner interfaces. Otherwise, inner interfaces cannot learn ARP or ND entries and fail to transmit NetStream statistics.

This command is supported only on the default context.

Examples

# Enable inner interfaces to learn ARP and ND entries in VLAN 200.

<Sysname> system-view

[Sysname] inner-interface learn arp-nd vlan 200

ip last-hop backup enable

Use ip last-hop backup enable to enable last hop backup.

Use undo ip last-hop backup enable to disable last hop backup.

Syntax

ip last-hop backup enable

undo ip last-hop backup enable

Default

Last hop backup is disabled.

Views

System view

Predefined user roles

network-admin

context-admin

context-operator

Usage guidelines

This command enables the IRF master device to perform the following operations when receiving the first IP packet of a forward flow on an interface enabled with last hop holding:

1.     Saves the last hop information of the packet.

2.     Synchronizes the last hop information to subordinate devices in the IRF fabric.

The last hop information can be used for guiding the backward flow when the flow arrives at the master device or is forwarded through a subordinate device.

This command takes effect only when the session synchronization is enabled by using the session synchronization enable command. For more information about the session synchronization enable command, see Security Command Reference.

This command is applicable only to IRF fabrics. Z-shaped traffic might be formed if packets are transparently sent from a subordinate device to the master device.

Examples

# Enable last hop backup.

<Sysname> system-view

[Sysname] ip last-hop backup enable

Related commands

ip last-hop hold

session synchronization enable (Security Command Reference)

ip last-hop hold

Use ip last-hop hold to enable last hop holding.

Use undo ip last-hop hold to disable last hop holding.

Syntax

ip last-hop hold

undo ip last-hop hold

Default

Last hop holding is disabled.

Views

Layer 3 Ethernet interface view

Layer 3 Ethernet subinterface view

Predefined user roles

network-admin

context-admin

Usage guidelines

Last hop holding implements symmetric routing. It tracks the last hop MAC address for the first incoming IP packet of a connection, and it sends the return packets to the hop that transmits the request.

Last hop holding is based on fast forwarding entries. If the MAC address of a last hop changes, this feature can function correctly only after the fast forwarding entry is updated for the MAC address.

Examples

# Enable the last hop holding feature.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/1

[Sysname-GigabitEthernet1/0/1] ip last-hop hold

 

Load sharing commands

ip load-sharing local-first enable

Use ip load-sharing local-first enable to enable local-first load sharing.

Use undo ip load-sharing local-first enable to disable local-first load sharing.

Syntax

ip load-sharing local-first enable

undo ip load-sharing local-first enable

Default

Local-first load sharing is disabled.

Views

System view

Predefined user roles

network-admin

context-admin

Usage guidelines

Local-first load sharing takes effect only on an IRF fabric.

Examples

# Enable local-first load sharing.

<Sysname> system-view

[Sysname] ip load-sharing local-first enable

ip load-sharing mode

Use ip load-sharing mode to configure the load sharing mode.

Use undo ip load-sharing mode to restore the default.

Syntax

ip load-sharing mode { per-flow [ dest-ip | dest-port | ip-pro | src-ip | src-port ] * | per-packet } { global | slot slot-number }

undo ip load-sharing mode { global | slot slot-number }

The following compatibility matrix shows the support of hardware platforms for this command:

 

Hardware	Command compatibility
F1000-A-G3, F1000-C-G3, F1000-E-G3, F1000-S-G3	Yes
F100-A-G3, F100-C-G3	Yes
F100-E-G3, F100-M-G3, F100-S-G3	No
F1000-E-VG	Yes
F1000-S-VG	No
F1000-A-G2, F1000-C-G2,  F1000-E-G2, F1000-S-G2	Yes
F100-A-G2, F100-C-G2	Yes
F100-E-G2, F100-M-G2, F100-S-G2	No
F1000-C-EI, F100-A-EI, F100-A-SI, F100-E-EI	Yes
F100-C-EI	No
F100-A80-WiNet,	Yes
F100-C80-WiNet, F100-C60-WiNet, F100-C50-WiNet, F100-S80-WiNet	No
F1000-C8180, F1000-C8170, F1000-C8160	Yes
F1000-C8150, F1000-C8130, F1000-C8120, F1000-C8110	No
F100-C-A6, F100-C-A5, F100-C-A3	No
F100-C-A6-WL, F100-C-A5-W,  F100-C-A3-W	No
F1000-C-HI, F100-A-HI	Yes
F100-C-HI, F100-S-HI	No
F1000-990-AI, F1000-980-AI, F1000-970-AI, F1000-960-AI, F1000-950-AI, F1000-930-AI, F1000-920-AI	Yes
LSPM6FWD8, LSQM2FWDSC8	No

‌

Default

The device performs per-flow load sharing.

Views

System view

Predefined user roles

network-admin

context-admin

Parameters

per-flow: Implements per-flow load sharing.

dest-ip: Identifies flows by destination IP address.

dest-port: Identifies flows by destination port.

ip-pro: Identifies flows by protocol number.

src-ip: Identifies flows by source IP address.

src-port: Identifies flows by source port.

global: Configures the load sharing mode globally.

per-packet: Implements per-packet load sharing.

slot slot-number: Specifies an IRF member device by its member ID. If you do not specify a member device, this command configures the load sharing mode for all member devices.

Usage guidelines

The per-packet load sharing mode does not take effect in fast forwarding.

Examples

# Configure per-flow load sharing for slot 1.

<Sysname> system-view

[Sysname] ip load-sharing mode per-flow slot 1