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.
Table 85. Recommended VRRP Advertise Intervals on the S4820T
Recommended Advertise
Interval
Groups/Interface
Total VRRP Groups S4820T S4820T
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
VRRP Configuration
By default, VRRP is not configured.
Configuration Task List
The following list specifies the configuration tasks for VRRP.
• Creating a Virtual Router (mandatory)
• Configuring the VRRP Version for an IPv4 Group (optional)
• Assign Virtual IP Addresses mandatory)
• Setting VRRP Group (Virtual Router) Priority (optional)
• Configuring VRRP Authentication (optional)
• Disabling Preempt (optional)
• Changing the Advertisement Interval (optional)
• Track an Interface or Object
• Setting VRRP Initialization Delay
For a complete listing of all commands related to VRRP, refer to Dell Networking OS Command Line
Reference Guide.
1118
Virtual Router Redundancy Protocol (VRRP)
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