Administrator Guide

Figure 158. Basic VRRP Configuration
VRRP Benefits
With VRRP configured on a network, end-station connectivity to the network is not subject to a single point-of-failure. End-station
connections to the network are redundant and are not dependent on internal gateway protocol (IGP) protocols to converge or update
routing tables.
VRRP Implementation
Within a single VRRP group, up to 12 virtual IP addresses are supported.
Virtual IP addresses can belong to the primary or secondary IP address’ subnet configured on the interface. You can ping all the virtual IP
addresses configured on the Master VRRP router from anywhere in the local subnet.
Up to 255 VRRP groups are supported on the switch. The total number of VRRP groups per system should be less than 512.
The following recommendations shown may vary depending on various factors like address resolution protocol (ARP) broadcasts, IP
broadcasts, or spanning tree protocol (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 may increase or
decrease accordingly.
CAUTION:
Increasing the advertisement interval increases the VRRP Master dead interval, resulting in an increased
failover time for Master/Backup election. Take caution when increasing the advertisement interval, as the increased
dead interval may cause packets to be dropped during that switch-over time.
Table 140. Recommended VRRP Advertise Intervals on the Switch
Recommended Advertise Interval Groups/Interface
Total VRRP Groups
Less than 250 1 second 12
Virtual Router Redundancy Protocol (VRRP) 1007