flush-policy difference

Use flush-policy difference to enable incremental flush for TRILL multicast routing entries.

Use undo flush-policy difference to restore the default.

Syntax

flush-policy difference

undo flush-policy difference

Default

Incremental flush is disabled for TRILL multicast routing entries.

Views

TRILL view

Predefined user roles

network-admin

mdc-admin

Usage guidelines

TRILL multicast routing entries are classified into three levels according to the following key combinations:

An entry that is identified by fewer keys is at a higher level.

The incremental flush feature enables the device to compare the outgoing port list and local receiving flag of an entry with its next higher level entry. If the two entries have the same outgoing port list and local receiving flag, the higher level entry is issued to the TRILL FIB. For example, if entry RB 2 and entry RB 2+VLAN 10 have the same outgoing port list and local receiving flag, entry RB 2 is issued.

This feature reduces the number of flushed entries in the scenarios where an entry and its next higher level entry have the same outgoing port list and local receiving flag. Enabling this feature in other scenarios causes the system to issue a large number of entries at the same time and degrades performance.

Examples

# Enable incremental flush for TRILL multicast routing entries.

<Sysname> system-view
[Sysname] trill
[Sysname-trill] flush-policy difference