timer purge-zero-lsp route-calculate-delay

Function

The timer purge-zero-lsp route-calculate-delay command configures a period for the device to delay route calculation when the device receives a purge LSP.

The undo timer purge-zero-lsp route-calculate-delay command restores the default configuration.

By default, if the device receives a purge LSP, it delays route calculation for 10s.

Format

timer purge-zero-lsp route-calculate-delay delay-interval

undo timer purge-zero-lsp route-calculate-delay

Parameters

Parameter	Description	Value
delay-interval	Specifies a period for the device to delay route calculation when the device receives a purge LSP.	The value is an integer ranging from 0 to 65535, in seconds.

Parameter

Description

Value

delay-interval

Specifies a period for the device to delay route calculation when the device receives a purge LSP.

The value is an integer ranging from 0 to 65535, in seconds.

Views

IS-IS view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
isis	write

Usage Guidelines

Usage Scenario

On an IS-IS network, if a local LSP changes, the device sends a purge LSP to advertise the change. If purge LSPs are received or sent frequently and routes are recalculated immediately, a lot of system resources will be consumed. To prevent this problem, run the timer purge-zero-lsp route-calculate-delay command to configure a period for the device to delay route calculation when the device receives a purge LSP.

After the command is run, the device triggers suppression by delaying route calculation after it receives a purge LSP with fragment number 0. After the delay-interval elapses, IS-IS exits from suppression. During the suppression period, IS-IS exits from suppression if the device receives a non-purge LSP with fragment number 0.

Prerequisites

An IS-IS process has been created and the IS-IS view has been displayed using the isis command.

Example

# Configure the device to delay route calculation for 5s when the device receives a purge LSP.

<HUAWEI> system-view
[~HUAWEI] isis
[*HUAWEI-isis-1] timer purge-zero-lsp route-calculate-delay 5