Modifying The Preemption Hold-Time Value; Configuring Asymmetric Hold Time For Vrrp Routers - Juniper ACX1000 Configuration Manual

Modifying the Preemption Hold-Time Value

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Configuring Asymmetric Hold Time for VRRP Routers

Copyright © 2017, Juniper Networks, Inc.
The hold time is the maximum number of seconds that can elapse before a higher-priority
backup router preempts the master router. You might want to configure a hold time so
that all Junos OS components converge before preemption.
By default, the hold-time value is 0 seconds. A value of 0 means that preemption can
occur immediately after the backup router comes online.
NOTE: The hold time is counted from the time the backup router comes
online. The hold time is only valid when the VRRP router is just coming online.
To modify the preemption hold-time value, include the
hold-time seconds;
The hold time can be from 0 through 3600 seconds.
You can include this statement at the following hierarchy level:
[edit interfaces interface-name unit logical-unit-number family inet address address
vrrp-group group-id preempt]
Understanding VRRP on ACX Series Routers on page 651
Configuring Basic VRRP Support on page 653
Configuring the Advertisement Interval for the VRRP Master Router on page 655
Configuring a Backup Router to Preempt the Master Router on page 656
Configuring Asymmetric Hold Time for VRRP Routers on page 657
Configuring an Interface to Accept Packets Destined for the Virtual IP Address on
page 658
Example: Configuring VRRP on page 665
Configuring VRRP for IPv6 on page 667
The asymmetric-hold-time
you to configure a VRRP master router to switch over to the backup router
immediately—that is, without waiting for the priority hold time to expire—when a tracked
interface or route goes down or when the bandwidth of a tracked interface decreases.
Such events can cause an immediate reduction in the priority based on the configured
priority cost for the event, and trigger a mastership election.
However, when the tracked route or interface comes up again, or when the bandwidth
for a tracked interface increases, the backup (original master) router waits for the hold
Chapter 21: Configuring Virtual Router Redundancy Protocol (VRRP)
statement at the [edit protocols vrrp]
hold-time statement:
hierarchy level enables
657