timer lsp-max-age (IS-IS view)

Function

The timer lsp-max-age command configures the maximum Keepalive time of an LSP generated by the current IS-IS process.

The undo timer lsp-max-age command restores the default value.

By default, the maximum Keepalive time of an LSP is 1200 seconds.

Format

timer lsp-max-age max-age-value

undo timer lsp-max-age

Parameters

Parameter	Description	Value
max-age-value	Specifies the maximum Keepalive time of an LSP.	The value ranges from 2 to 65535 seconds.

Parameter

Description

Value

max-age-value

Specifies the maximum Keepalive time of an LSP.

The value ranges from 2 to 65535 seconds.

Views

IS-IS view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
isis	write

Usage Guidelines

Usage Scenario

When generating the system LSP, a device fills in the maximum Keepalive time for this LSP. When other devices receive this LSP, the Keepalive time of the LSP is reduced continuously. If a device does not receive the update LSP, the Keepalive time of the LSP is reduced to 0, the LSP is kept for 60 seconds. If a new LSP is not received in 60 seconds, the device deletes the LSP.

The timer lsp-max-age command can adjust the maximum Keepalive time of an LSP to ensure the validity of old LSPs before the refreshed LSPs are received.

Prerequisites

Before running the timer lsp-max-age command, run the isis command to create an IS-IS process.

Configuration Impact

If the maximum Keepalive time of an LSP is configured too short, the LSP may be lost.

Precautions

The maximum Keepalive time of an LSP must be longer than the LSP refresh interval configured by timer lsp-refresh. Otherwise, the LSP cannot be updated before being deleted.

Example

# Set the maximum Keepalive time of the LSP that is generated by the current IS-IS process to 25 minutes, that is, 1500 seconds.

<HUAWEI> system-view
[~HUAWEI] isis
[*HUAWEI-isis-1] timer lsp-max-age 1500