952 | Virtual Router Redundancy Protocol (VRRP)
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The recommendations in Table 49-1 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 on page 953 (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)
• VRRP initialization delay
For a complete listing of all commands related to VRRP, refer to
FTOS Command Line Interface.
Between 450 and 600 3 seconds 4 seconds 3 - 4 seconds 3 - 4
seconds
512 255 36 36 36
Between 600 and 800 4 seconds 5 seconds 4 seconds 4 seconds 512 255 48 48 48
Between 800 and 1000 5 seconds 5 seconds 5 seconds 5 seconds 512 255 84 84 84
Between 1000 and 1200 7 seconds 7 seconds 7 seconds 7 seconds 512 255 100 100 100
Between 1200 and 1500 8 seconds 8 seconds 8 seconds 8 seconds 512 255 120 120 120
Note: The 1500 VRRP groups are supported in FTOS Release 6.3.1.0 and later.
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.
Table 49-1. Recommended VRRP Advertise Intervals
Total VRRP Groups
Recommended Advertise Interval Groups/Interface
E-Series C-Series S-Series Z-Series
E-Series
ExaScale
E-Series
TeraScale C-Series S-Series Z-Series
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