graceful-restart (IPv4)

Function

The graceful-restart command enables PIM GR.

The undo graceful-restart command disables PIM GR.

By default, PIM GR is not enabled.

Format

graceful-restart

undo graceful-restart

Parameters

None

Views

PIM view of public network instance or PIM view of VPN instance

Default Level

2: Configuration level

Usage Guidelines

Usage Scenario

If a stack is used on the PIM-SM network, after an active/standby switchover occurs in the stack system, multicast data transmission is interrupted because the new master device does not have PIM forwarding entries.

PIM GR enables the system to back up join and prune information in PIM routing entries to the new master device when an active/standby switchover is performed in the system. This ensures normal multicast data forwarding during restoration of the multicast distribution tree. For details about stack configuration, see Stack Configuration in the S2720, S5700, and S6700 V200R019C10 Configuration Guide - Device Management.

Prerequisites

IP multicast routing has been enabled using the multicast routing-enable command.

Precautions

At least one switch interface must have PIM-SM enabled for the graceful-restart command to take effect.

Example

# Enable PIM GR in the PIM view of public network instance.

<HUAWEI> system-view
[HUAWEI] multicast routing-enable
[HUAWEI] pim
[HUAWEI-pim] graceful-restart