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Command Reference for AT-IX5-28GPX High Availability, High Power Video Surveillance PoE Switch
C613-50057-01 REV A
AlliedWare Plus™ Operating System - Version 5.4.5-0.x
VRRP C
OMMANDS
PREEMPT
-
MODE
preempt-mode
Overview
Use this command to configure preempt mode. If preempt-mode is set to
true
,
then the highest priority backup will always be the master when the default master
is unavailable.
If preempt-mode is set to
false
, then a higher priority backup will not preempt a
lower priority backup who is acting as master.
Syntax
preempt-mode {true|false}
Default
The default is
true
.
Mode
Router Configuration
Usage
When the master router fails, the backup routers come online in priority
order—highest to lowest. Preempt mode means that a higher priority back up
router will take over the master role from a lower priority back up. Preempt mode
on
true
allows a higher priority backup router to relieve a lower priority backup
router.
By default, a preemptive scheme is enabled whereby a higher priority backup
virtual router that becomes available take over for the backup virtual router that
was elected to become the master virtual router.
This preemptive scheme can be disabled using the
preempt-mode false
command. If preemption is disabled, the backup virtual router that is currently
elected as the master virtual router does not transition to backup virtual router
again whenever the alternate backup router with a higher priority becomes
available.
See the
VRRP Feature Overview and Configuration Guide
for more information
about:
•
VRRPv3 IPv4 configuration details
•
VRRPv3 IPv6 configuration details
•
preempt mode
Examples
The example below shows you how to configure preempt-mode as true for VRRP
VR ID 5 on vlan2:
awplus#
configure terminal
awplus(config)#
router vrrp 5 vlan2
awplus(config-router)#
preempt-mode true
Parameter
Description
true
Preemption is enabled.
false
Preemption is disabled.
