Contents

Basic IP forwarding commands· 1

display fib· 1

display fib usage· 2

ip forwarding-table save· 3

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 a VPN 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.

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.

 

display fib usage

Use display fib usage to display the FIB table usage.

Syntax

display fib usage

Views

Any view

Predefined user roles

network-admin

network-operator

Usage guidelines

You can view the FIB table usage in the most recent hour.

Examples

# Display the FIB table usage.

<Sysname> display fib usage

FIB table upper limit： 65000

  Time          FIB count   Usage

  Current       52000       80%

  1 min ago     51351       79%

  2 min ago     50711       78%

  3 min ago     47748       77%

  …

  59 min ago    13656       21%

  60 min ago    13007       20%

Table 2 Command output

Field	Description
FIB table upper limit	Maximum number of entries supported by the FIB table.
Time	Time when the FIB table usage was recorded.
FIB count	Number of FIB entries.
Usage	FIB table usage, which is the ratio of the real-time FIB entry count to the FIB table upper limit.

 

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 per-flow algorithm algorithm-number [ shift shift-number ]{ 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

per-flow: Implements per-flow load sharing.

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.

global: Applies the command globally.

slot slot-number: Specifies an IRF member device by its member ID. If you do not specify a member device, the command applies to all member devices.

Usage guidelines

If traffic is not load shared equally, you can use the shift shift-number option to improve the load sharing.

Examples

# Configure the global per-flow load sharing, set the algorithm to 0, and specify the shift value to 1.

<Sysname> system-view

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