Reference Guide

764 | Virtual Router Redundancy Protocol (VRRP)
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The recommendations in Table 44-1 may vary depending on various factors like ARP broadcasts, IP
broadcasts, or STP before changing the advertisement interval. When the number of packets processed by
RP2/CP/FP processor increases or decreases based on the dynamics of the network, the advertisement
intervals in may increase or decrease accordingly.
VRRP Configuration
By default, VRRP is not configured.
Configuration Task List for VRRP
The following list specifies the configuration tasks for VRRP:
• Create a Virtual Router (mandatory)
• Assign Virtual IP addresses (mandatory)
• Set VRRP Group (Virtual Router) Priority (optional)
• Configure VRRP Authentication (optional)
• Disable Preempt (optional)
• Change the Advertisement interval (optional)
• Track an Interface (optional)
For a complete listing of all commands related to VRRP, refer to
FTOS Command Line Interface.
Create a Virtual Router
To enable VRRP, you must create a Virtual Router. In FTOS, a VRRP Group is identified by the Virtual
Router Identifier (VRID).
To enable a Virtual Router, use the following command in the INTERFACE mode. To delete a VRRP
group, use the
no vrrp-group vrid command in the INTERFACE mode.
CAUTION: Increasing the advertisement interval increases the VRRP Master dead interval, resulting in an
increased failover time for Master/Backup election. Take extra caution when increasing the advertisement
interval, as the increased dead interval may cause packets to be dropped during that switch-over time.
Task Command Syntax Command Mode
Create a virtual router for that interface
with a VRID.
vrrp-group vrid
VRID Range: 1-255
INTERFACE
Note: The interface must already have a Primary IP Address defined, and
be enabled.