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:
RB—Root bridge of a TRILL distribution tree.
RB+VLAN—Root bridge and VLAN of a TRILL distribution tree.
RB+VLAN+MAC—Root bridge and VLAN of a TRILL distribution tree and a MAC address.
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