Deployment Guide

Figure 126. Basic VRRP Conguration
VRRP Benets
With VRRP congured 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
Dell Networking OS supports a total of 2000 VRRP groups on a switch and 255 VRRP groups per interface
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 congured on the interface. You can ping all the virtual IP addresses congured on the Master VRRP router from anywhere
in the local subnet.
Default VRRP settings may aect the maximum number of groups that you can congure and work eciently, as a result of hardware
throttling VRRP advertisement packets reaching the CP on the switch. To avoid throttling VRRP advertisement packets, Dell Networking
recommends increasing the VRRP advertisement interval to a value higher than the default value of 1 second.
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.
The recommendations in the following table vary, depending on several factors; for example, address resolution protocol (ARP) broadcasts,
IP broadcasts, or spanning tree protocol (STP) before changing the advertisement interval. When the number of packets processed by the
Virtual Router Redundancy Protocol (VRRP)
905