White Papers

Figure 153. 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
The S5000 supports a total of 255 VRRP groups on a switch.
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.
The recommendations in the following table 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 may increase or decrease accordingly.
Default VRRP settings may affect the maximum number of groups that you can configure and work efficiently as a result
of hardware throttling VRRP advertisement packets reaching the RP2 processor on the S5000. 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. The recommendations are as follows:
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 drop during that switch-over time.
978 Virtual Router Redundancy Protocol (VRRP)