Reference Guide

1044 | Virtual Router Redundancy Protocol (VRRP)
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The recommendations in Table 60-1, "Recommended VRRP Advertise Intervals," in Virtual Router
Redundancy Protocol (VRRP) 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 version 3
VRRP version 3 defines VRRP for IPv6. The vrrp-ipv6-group command is used to create IPv6 VRRP
groups, and is similar to the
vrrp-group command, which creates an IPv4 VRRP group and moves you from
INTERFACE mode to a group-specific VRRP command sub-mode.
In the VRRP mode, all VRRP commands are supported for IPv4 and IPv6, except for
authentication-type
which is not supported for IPv6. Also, the following EXEC commands are different for IPv4 and IPv6:
• clear:
• IPv4: clear counters vrrp
• IPv6: clear counters vrrp ipv6
• debug:
• IPv4: debug vrrp
• IPv6: debug vrrp ipv6
• show:
• IPv4: show vrrp
• IPv6: show vrrp ipv6
VRRP Configuration
By default, VRRP is not configured.
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 or Object (optional)
For a complete listing of all commands related to VRRP, refer to
FTOS Command Line Interface.
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.