Due to heavy traffic load, the monitoring ports MON0/MON1 flap between bypass/inline state consistently. To resolve the flapping issue, change the heartbeat interval and heartbeat hold time from default settings of 100 ms and 300 ms respectively to a higher setting.
Heartbeat interval - The frequency of heartbeat packets sent out of monitoring ports MON0 and MON1.
Heartbeat hold time - Time for the Active Fail Open kit to go to bypass mode if no heartbeat packets are received within the defined time.
This means that if no heartbeat packets are received within 300 ms, the Active Fail Open kit goes into bypass mode. To prevent false positives being triggered, we send 3 heartbeats within the hold time.
Note
The thumb rule is that the heartbeat hold time has to be 3 times greater than the heartbeat interval.
Perform the following steps to troubleshoot the issue:
Login to the web interface, and go to the Bypass tab.
By default, the heartbeat interval is 100 ms. Set the heartbeat hold time to 500 ms.
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Continue to increase the heartbeat hold time 100 ms at a time until the flapping is resolved under heavy traffic load.