timer hello (VPN instance PIM view/PIM view of a public network instance)

Function

The timer hello command globally sets an interval at which PIM interfaces send Hello messages.

The undo timer hello command restores the default value of the interval.

By default, PIM interfaces send Hello messages at an interval of 30 seconds.

Format

timer hello interval

undo timer hello

Parameters

Parameter	Description	Value
interval	Specifies the interval at which PIM interfaces send Hello messages.	The value is an integer ranging from 1 to 18000, in seconds.

Parameter

Description

Value

interval

Specifies the interval at which PIM interfaces send Hello messages.

The value is an integer ranging from 1 to 18000, in seconds.

Views

VPN instance PIM view, PIM view of a public network instance

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
pim	write

Usage Guidelines

Usage Scenario

A Router on a PIM-SM network needs to send Hello messages periodically to maintain PIM neighbor relationships. To set the interval at which PIM interfaces send Hello messages, run the timer hello command. To have a Router rapidly sense PIM neighbor changes, set a Hello packet sending interval smaller than the configured neighbor timeout period.

Prerequisites

The multicast routing function has been enabled using the multicast routing-enable command in the public network instance view or VPN instance view.

Configuration Impact

If the timer hello command is run more than once, the latest configuration overrides the previous one.

The timer hello command can be run in the PIM view of a VPN instance to change the interval for sending Hello messages on all interfaces of the VPN instance.

Example

# In the public network instance, specify 40 seconds as the interval at which PIM interfaces send Hello messages.

<HUAWEI> system-view
[~HUAWEI] multicast routing-enable
[*HUAWEI] pim
[*HUAWEI-pim] timer hello 40