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Dell PowerEdge FN I/O Module Configuration Guide 9.10(0.0)

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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 configured on the interface. You can ping all the virtual IP addresses configured on the Master VRRP router from anywhere in the local subnet.

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 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 CP processor increases or decreases based on the dynamics of the network, the advertisement intervals in may increase or decrease accordingly.

Table 1. Recommended VRRP Advertise Intervals
Recommended Advertise Interval   Groups/Interface
Less than 250 1 second 255
Between 250 and 450 2–3 seconds 255
Between 450 and 600 3–4 seconds 255

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