• Configuring an Interface to Accept Packets Destined for the Virtual IP Address on
page 658
• Configuring a Logical Interface to Be Tracked on page 659
• Tracing VRRP Operations on page 664
• Configuring the Silent Period on page 663
• Example: Configuring VRRP on page 665
Configuring the Silent Period
The silent period starts when the interface state is changed from down to up. During this
period, the Master Down Event is ignored. Configure the silent period interval to avoid
alarms caused by the delay or interruption of the incoming VRRP advertisement packets
during the interface startup phase.
To configure the silent period interval that the Master Down Event timer ignores, include
the startup-silent-period statement at the [edit protocols vrrp] hierarchy level:
[edit protocols vrrp]
startup-silent-period seconds;
NOTE: During the silent startup period, the show vrrp detail command output
shows a value of 0 for Master priority and your IP address for Master router.
These values indicate that the selection of the master router is not completed
yet, and these values can be ignored.
When you have configured startup-silent-period, the Master Down Event is ignored until
the startup-silent-period expires.
For example, configure a VRRP group, vrrp-group1, with an advertise interval of 1 second,
startup silent period of 10 seconds, and an interface interface1 with a priority less than
255.
When interface1 transitions from down to up:
•
The vrrp-group1 group moves to the backup state, and starts the Master Down Event
timer (3 seconds; three times the value of the advertise interval, which is 1 second in
this case).
•
If no VRRP PDU is received during the 3-second period, the startup-silent-period (10
seconds in this case) is checked, and if the startup silent period has not expired, the
Master Down Event timer is restarted. This is repeated until the startup-silent-period
expires. In this example, the Master Down Event timer runs four times (12 seconds) by
the time the 10-second startup silent period expires.
•
If no VRRP PDU is received by the end of the fourth 3-second cycle, vrrp-group1 takes
over mastership.
663Copyright © 2017, Juniper Networks, Inc.
Chapter 21: Configuring Virtual Router Redundancy Protocol (VRRP)
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