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(Optional) Setting GARP Timers
Context
When many dynamic VLANs need to
be registered or the network radius is large, using default values
of timers may cause VLAN flapping and high CPU usage. In this case,
increase values of the timers. The following values are recommended
depending on the number of VLANs.
Table 8-6 Relationship between GARP timer values and number of dynamic
VLANs that need to be registered
Timer |
Number of Dynamic VLANs to Be Registered (N) |
|||
|---|---|---|---|---|
N <= 500 |
500 < N <= 1000 |
1000 < N <= 1500 |
N > 1500 |
|
GARP Hold timer |
100 centiseconds (1 second) |
200 centiseconds (2 seconds) |
800 centiseconds (8 seconds) |
1000 centiseconds (10 seconds) |
GARP Join timer |
600 centiseconds (6 seconds) |
1200 centiseconds (12 seconds) |
4000 centiseconds (40 seconds) |
6000 centiseconds (1 minute) |
GARP Leave timer |
3000 centiseconds (30 seconds) |
6000 centiseconds (1 minute) |
20000 centiseconds (3 minutes and 20 seconds) |
30000 centiseconds (5 minutes) |
GARP LeaveAll timer |
12000 centiseconds (2 minutes) |
24000 centiseconds (4 minutes) |
30000 centiseconds (5 minutes) |
32765 centiseconds (5 minutes and 27.65 seconds) |