isis timer hello

Use isis timer hello to set the interval for sending hello packets.

Use undo isis timer hello to remove the configuration.

Syntax

isis timer hello seconds [ level-1 | level-2 ]

undo isis timer hello [ level-1 | level-2 ]

Default

The hello interval is 10 seconds.

Views

Interface view

Predefined user roles

network-admin

Parameters

seconds: Specifies the interval for sending hello packets, in the range of 3 to 255 seconds.

level-1: Specifies the interval for sending Level-1 hello packets.

level-2: Specifies the interval for sending Level-2 hello packets.

Usage guidelines

If a neighbor does not receive any hello packets from the router within the advertised hold time, it considers the router down and recalculates the routes. The hold time is the hello multiplier multiplied by the hello interval.

Level-1 and Level-2 hello packets are sent independently on a broadcast network, so you need to specify an interval for each level. On a P2P link, Level-1 and Level-2 packets are both sent in P2P hello packets, and you need not specify an interval for each level.

You can configure the level-1 and level-2 keywords only on broadcast interfaces. Before you configure the level-1 or level-2 keyword, enable IS-IS on the interface.

The shorter the interval, the more system resources will be occupied.

If no level is specified, the hello interval applies to both Level-1 and Level-2.

Examples

# Configure Level-2 hello packets to be sent every 20 seconds over VLAN-interface 10.

<Sysname> system-view
[Sysname] interface vlan-interface 10
[Sysname-Vlan-interface10] isis timer hello 20 level-2

Related commands

isis timer holding-multiplier