Dell Configuration Guide for the S4048–ON System 9.14.2.4

PDF

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.

The S-Series supports varying number of maximum VRRP groups per interface. The supports a total of 2000 VRRP groups on a switch and 512 VRRP groups per interface.

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.

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.

Table 1. Recommended VRRP Advertise IntervalsRecommended VRRP Advertise Intervals
Total VRRP Groups	Recommended Advertise Interval	Groups/Interface
Less than 250	1 second	12
Between 250 and 450	2–3 seconds	24
Between 450 and 600	3–4 seconds	36
Between 600 and 800	4 seconds	48
Between 800 and 1000	5 seconds	84
Between 1000 and 1200	7 seconds	100
Between 1200 and 1500	8 seconds	120