Reference Guide
1046 | Virtual Router Redundancy Protocol (VRRP)
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The recommendations in Table 54-1 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)
Between 1000 and 1200 7 seconds 7 seconds 7 seconds 512 255 100 100
Between 1200 and 1500 8 seconds 8 seconds 8 seconds 512 255 120 120
Table 54-2. Recommended VRRP Advertise Intervals on the S4810, S4820T, S55, S60
Total VRRP Groups
Recommended Advertise Interval Groups/Interface
S4810/S4820T S55 S60 S4810/S4820T S55 S60
Less than 250 1 second 1 second 1 second 512 100 100
Between 250 and 450 2 - 3 seconds 2 - 3 seconds 2 - 3 seconds 512 100 100
Between 450 and 600 3 - 4 seconds 3 - 4 seconds 3 - 4 seconds 512 100 100
Between 600 and 800 4 seconds 4 seconds 4 seconds 512 100 100
Between 800 and 1000 5 seconds 5 seconds 5 seconds 512 100 100
Between 1000 and 1200 7 seconds 7 seconds 7 seconds 512 100 100
Between 1200 and 1500 8 seconds 8 seconds 8 seconds 512 100 100
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 54-1. Recommended VRRP Advertise Intervals
Total VRRP Groups
Recommended Advertise Interval Groups/Interface
E-Series C-Series
S-Series
(S25, S50)
E-Series
ExaScale
E-Series
TeraScale C-Series
S-Series
(S25, S50)