Administrator Guide

Figure 137. 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
The MXL 10/40GbE Switch 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 youcan congure and work eciently, as a result of hardware
throttling VRRP advertisement packets reaching the CP on the MXL 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
870
Virtual Router Redundancy Protocol (VRRP)