Contents

Basic IP forwarding commands· 1

display fib· 1

forwarding vxlan-packet inner-protocol 3

ip forwarding-table save· 4

Load sharing commands· 5

ip load-sharing local-first enable· 5

ip load-sharing mode· 5

 

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

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:Usable   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     M-GE0/0/0                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:Usable   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        M-GE0/0/0                Null

20.20.20.0/32      20.20.20.25     UBH      M-GE0/0/0                Null

20.20.20.25/32     127.0.0.1       UH       InLoop0                  Null

20.20.20.25/32     20.20.20.25     H        M-GE0/0/0                Null

20.20.20.255/32    20.20.20.25     UBH      M-GE0/0/0                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:Usable   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.

 

forwarding vxlan-packet inner-protocol

Use forwarding vxlan-packet inner-protocol to enable hardware forwarding for specific packets received from VXLAN tunnels.

Use undo forwarding vxlan-packet inner-protocol to restore the default.

Syntax

forwarding vxlan-packet inner-protocol { ipv4 | ipv6 } *

undo forwarding vxlan-packet inner-protocol [ ipv4 | ipv6 ]

Default

Packets received from VXLAN tunnels are delivered to the CPU for processing.

Views

System view

Predefined user roles

network-admin

Parameters

ipv4: Specifies IPv4 packets.Only ARP packets are supported.

ipv6: Specifies IPv6 packets.Only MLD packets are supported.

Usage guidelines

By default, the device forwards ARP and MLD packets received from VXLAN tunnels to the CPU for processing when acting as a VTEP in a distributed EVPN gateway network. If a large number of such packets are received, packet loss might occur because of software rate limit, which might cause service exceptions on downlink devices.

To resolve this issue, you can enable the device to forward ARP and MLD packets received from VXLAN tunnels in hardware without delivering them to the CPU.

Traffic forwarding issues might occur if you use this command together with either of the following commands:

·     flooding disable all all-direction

·     flooding disable broadcast all-direction

To make sure the device can forward traffic correctly, perform the following steps before you enable this feature:

1.     Check the configuration for the flooding disable all all-direction and flooding disable broadcast all-direction commands.

2.     If either command exists, do the following:

a.     Execute the undo flooding disable command to enable flooding on the device.

b.     Execute the flooding disable all command to disable the device from flooding any types of traffic received from ACs to VXLAN tunnel interfaces of the VSI.

c.     Configure port isolation for the ACs to confine their flooding traffic.

To ensure access to slient devices, such as dumb terminals, you must also execute the undo mac-address static source-check enable command to disable the static source check feature. If you cannot identify whether silient devices exist, disable static source check as a best practice.

Examples

# Enable hardware forwarding for IPv4 packets received from VXLAN tunnels.

<Sysname> system-view

[Sysname] forwarding vxlan-packet inner-protocol ipv4

ip forwarding-table save

Use ip forwarding-table save to save the IP forwarding entries to a file.

Syntax

ip forwarding-table save filename filename

Views

Any view

Predefined user roles

network-admin

Parameters

filename filename: Specifies the name of a file, a string of 1 to 255 characters. For information about the filename argument, see file system management in Fundamentals Configuration Guide.

Usage guidelines

The command automatically creates the file if you specify a nonexistent file. If the file already exists, this command overwrites the file content.

To automatically save the IP forwarding entries periodically, configure a schedule for the device to automatically run the ip forwarding-table save command. For information about scheduling a task, see Fundamentals Configuration Guide.

Examples

# Save the IP forwarding entries to the fib.txt file.

<Sysname> ip forwarding-table save filename fib.txt

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 enabled.

Views

System view

Predefined user roles

network-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 specify a shift value for the load sharing algorithm result.

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

Syntax

ip load-sharing mode per-flow algorithm algorithm-number [ shift shift-number ] { global | slot slot-number }

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

Default

The shift value is 0 for the load sharing algorithm result.

Views

System view

Predefined user roles

network-admin

Parameters

algorithm algorithm-number: Specifies an algorithm for per-flow load sharing. The value range for the algorithm-number argument is 0 to 8.

shift shift-number: Specifies the shift value for the hash algorithm result. The value range is 0 to 15, and the default value is 0.

algorithm-switch: Specifies algorithm 1 for per-flow load sharing.

per-flow: Implements per-flow load sharing.

global: Configures the load sharing mode globally.

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

If traffic is not shared equally, you can use the shift shift-number option to adjust the algorithm result.

Examples

# Configure the device to use algorithm 0 for global per-flow load sharing and set the shift value to 1 for the algorithm result.

<Sysname> system-view

[Sysname] ip load-sharing mode per-flow algorithm 0 shift 1 global