07-23-2013 08:09 PM
Whats the maximum latency allowed for HA peering links (e.g HA1 control and HA2 keep-alive) between devices setup in active/passive HA pair?
i.e based on the latency can determine the approximate distance that HA pairs can be physically separated.. 1Km .. 100Km? etc. whilst connected via dark fibre.
07-23-2013 08:49 PM
The answer is, there are no hard and fast numbers. In A/P, you can adjust the HA timers to deal with delay between the two sites (to a certain extent). Less than 20ms should be a good rule of thumb. Latency on all HA links should be the about the same and should be less than the return time of traffic to avoid having the return packet dropped on the peer unit because the session does not exist yet. You can always contact your SE for these kinds of design questions. I hope this helps.
-chadd.
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