Contents

Basic IP forwarding commands· 1

display fib· 1

ip forwarding apply vpn-peer-id enable· 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

1.1.1.0/24         192.168.126.1   USGF     MGE1/0/0/0               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

 

0.0.0.0/32         127.0.0.1       UH       InLoop0                  Null

20.20.20.0/24      20.20.20.25     U        MGE1/0/0/0               Null

20.20.20.0/32      20.20.20.25     UBH      MGE1/0/0/0               Null

20.20.20.25/32     127.0.0.1       UH       InLoop0                  Null

20.20.20.25/32     20.20.20.25     H        MGE1/0/0/0               Null

20.20.20.255/32    20.20.20.25     UBH      MGE1/0/0/0               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.

 

ip forwarding apply vpn-peer-id enable

Use ip forwarding apply vpn-peer-id enable to enable the VPN peer-based processing.

Use undo ip forwarding apply vpn-peer-id enable to disable the VPN peer-based processing.

Syntax

ip forwarding apply vpn-peer-id enable

undo ip forwarding apply vpn-peer-id enable

Default

The VPN peer-based processing is disabled.

Views

System view

Predefined user roles

network-admin

context-admin

context-operator

Usage guidelines

This feature enables the device to use the VPN peer ID of the routing information in the FIB table to process packets.

This command must be used together with the apply vpn-peer-id command. For more information about the command, see Layer 3—IP Routing Command Reference.

Examples

# Enable the VPN peer-based processing.

<Sysname> system-view

[Sysname] ip forwarding apply vpn-peer-id enable

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 1/2/5/1

[Sysname-GigabitEthernet1/2/5/1] 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

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 } { chassis chassis-number slot slot-number | global }

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

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.

chassis chassis-number slot slot-number: Specifies a card on an IRF member device. The chassis-number argument represents the member ID of the IRF member device. The slot-number argument represents the slot number of the card. If you do not specify a card, this command configures the load sharing mode for all cards.

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 chassis 1 slot 1