isis timer lsp-retransmit

Function

The isis timer lsp-retransmit command sets the interval for retransmitting LSPs over a P2P link.

The undo isis timer lsp-retransmit command restores the default value.

By default, the interval for retransmitting LSPs over a P2P link is 5 seconds.

Format

isis timer lsp-retransmit retransmit-interval

undo isis timer lsp-retransmit

Parameters

Parameter	Description	Value
retransmit-interval	Specifies the interval for retransmitting LSPs.	The value is an integer that ranges from 1 to 300.

Views

Interface view

Default Level

2: Configuration level

Usage Guidelines

Usage Scenario

On a point-to-point network, devices at both ends of a link synchronize LSDBs with each other by flooding LSPs. The device at one end of the link sends an LSP. If the device at the other end receives this LSP, it replies with a PSNP. If the device that has sent an LSP does not receive a PSNP from the other end in a period of time, the device will retransmit the LSP.

The isis timer lsp-retransmit command is used to set an interval for retransmitting LSPs. Only the devices on a point-to-point network send PSNPs. Therefore, the isis timer lsp-retransmit command will take effect only when it is run on point-to-point interfaces.

Precautions

After the isis timer lsp-retransmit command is run on a device, the device will wait retransmit-interval after having sent an LSP. If the device receives a PSNP from the other end, the device will not retransmit the LSP. Otherwise, the device will retransmit the LSP.

If the value of retransmit-interval is set too small, an LSP will be retransmitted even though it is not necessary, causing high CPU, memory, and network bandwidth usage.

If a broadcast interface is emulated as a P2P interface through the isis circuit-type command or restored a P2P interface to the broadcast interface through the undo isis circuit-type command, the interval for retransmitting LSP packets on a P2P link is restored to the default value.

Example

# Set the interval for retransmitting LSPs on VLANIF100 to 10 seconds.

<HUAWEI> system-view

[HUAWEI] isis

[HUAWEI-isis-1] network-entity 01.0000.0000.0001.00

[HUAWEI-isis-1] quit

[HUAWEI] interface vlanif 100

[HUAWEI-Vlanif100] isis enable 1

[HUAWEI-Vlanif100] isis circuit-type p2p

[HUAWEI-Vlanif100] isis timer lsp-retransmit 10

# Set the interval for retransmitting LSPs on GE0/0/1 to 10 seconds.

<HUAWEI> system-view
[HUAWEI] isis
[HUAWEI-isis-1] network-entity 01.0000.0000.0001.00
[HUAWEI-isis-1] quit
[HUAWEI] interface gigabitethernet 0/0/1
[HUAWEI-GigabitEthernet0/0/1] undo portswitch
[HUAWEI-GigabitEthernet0/0/1] isis enable 1
[HUAWEI-GigabitEthernet0/0/1] isis circuit-type p2p
[HUAWEI-GigabitEthernet0/0/1] isis timer lsp-retransmit 10