pim hello-option dr-priority (Mtunnel view)

Function

The pim hello-option dr-priority command configures a designated router (DR) election priority for a PIM interface.

The undo pim hello-option dr-priority command restores the default priority.

By default, the DR election priority of a PIM interface is 1.

Format

pim hello-option dr-priority priority

undo pim hello-option dr-priority

Parameters

Parameter	Description	Value
priority	Specifies a DR election priority. A larger value indicates a higher priority.	The value is an integer ranging from 0 to 4294967295.

Parameter

Description

Value

priority

Specifies a DR election priority. A larger value indicates a higher priority.

The value is an integer ranging from 0 to 4294967295.

Views

MTI interface view, Mtunnel view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
pim	write

Usage Guidelines

Usage Scenario

On a PIM-SM shared network segment, a DR is dynamically elected among candidate Router interfaces. DR election is based on priorities and IP addresses of interfaces on Routers. In a DR election process, Routers exchange Hello messages carrying DR election priorities.

If all Routers support Hello messages that carry DR election priorities, the interface with the highest DR election priority wins. If all interfaces have the same DR election priority, the interface with the largest IP address wins.
If one or more Routers do not support Hello messages that carry DR priorities, the interface with the largest IP address wins.

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 pim hello-option dr-priority command is run more than once, the latest configuration overrides the previous one.

Example

# Set the DR election priority to 3 for Mtunnel 10.

<HUAWEI> system-view
[~HUAWEI] ip vpn-instance mytest
[*HUAWEI-vpn-instance-mytest] ipv4-family
[*HUAWEI-vpn-instance-mytest-af-ipv4] route-distinguisher 100:1
[*HUAWEI-vpn-instance-mytest-af-ipv4] multicast routing-enable
[*HUAWEI-vpn-instance-mytest-af-ipv4] multicast-domain share-group 224.1.1.1 binding mtunnel 10
[*HUAWEI-vpn-instance-mytest-af-ipv4] commit
[~HUAWEI-vpn-instance-mytest-af-ipv4] quit
[~HUAWEI-vpn-instance-mytest] quit
[~HUAWEI] interface Mtunnel 10
[~HUAWEI-MTunnel10] pim hello-option dr-priority 3