Dell Force10 S4810P Configuration Manual page 1100

Though FTOS on E-Series supports unlimited VRRP groups, default VRRP settings may affect the
maximum number of groups that can be configured and work efficiently, as a result of hardware throttling
VRRP advertisement packets reaching the RP2 processor on the E-Series, the CP on the C-Series, S4810,
S55, and S60, or the FP on the S25/S50. To avoid throttling VRRP advertisement packets, Dell Force10
recommends you to increase the VRRP advertisement interval to a value higher than the default value of 1
second. The recommendations are as follows:
Table 55-1. Recommended VRRP Advertise Intervals
Total VRRP Groups
Less than 250
Between 250 and 450
Between 450 and 600
Between 600 and 800
Between 800 and 1000
Between 1000 and 1200
Between 1200 and 1500
Table 55-2. Recommended VRRP Advertise Intervals on the S4810, S55, S60
Total VRRP Groups
Less than 250
Between 250 and 450
Between 450 and 600
Between 600 and 800
Between 800 and 1000
Between 1000 and 1200
Between 1200 and 1500
The recommendations in
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 in 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 extra caution when increasing the advertisement
interval, as the increased dead interval may cause packets to be dropped during that switch-over time.
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| Virtual Router Redundancy Protocol (VRRP)
Recommended Advertise Interval
E-Series C-Series
1 second 1 second
2 seconds 2 - 3 seconds
3 seconds 4 seconds
4 seconds 5 seconds
5 seconds 5 seconds
7 seconds 7 seconds
8 seconds 8 seconds
Recommended Advertise Interval
S4810 S55
1 second
2 - 3 seconds
3 - 4 seconds
4 seconds
5 seconds
7 seconds
8 seconds
Table 55-1 may vary depending on various factors like ARP broadcasts, IP
Groups/Interface
S-Series E-Series
(S25, S50) ExaScale
1 second 512
2 - 3 seconds 512
3 - 4 seconds 512
4 seconds 512
5 seconds 512
7 seconds 512
8 seconds 512
S60
1 second 1 second
2 - 3 seconds 2 - 3 seconds
3 - 4 seconds 3 - 4 seconds
4 seconds 4 seconds
5 seconds 5 seconds
7 seconds 7 seconds
8 seconds 8 seconds
E-Series S-Series
TeraScale C-Series (S25, S50)
255 12
255 24
255 36
255 48
255 84
255 100
255 120
Groups/Interface
S4810 S55
512 100
512 100
512 100
512 100
512 100
512 100
512 100
12
24
36
48
84
100
120
S60
100
100
100
100
100
100
100