Deployment Guide

Figure 176. 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.
In conjunction with Virtual Link Trunking (VLT), you can configure optimized forwarding with virtual router redundancy protocol
(VRRP).
NOTE:
In a VLT environment, VRRP configuration acts as active-active and if route is not present in any of the VRRP
nodes, the packet to the destination is dropped on that VRRP node.
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.
Z-Series supports a total of 255 VRRP groups on a 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.
1060 Virtual Router Redundancy Protocol (VRRP)