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Cisco ACE Health Probes

Probe Interval: 5

Pass Detect (Seconds): 60

Fail Detect: 3

Please can someone explain the above settings that are configured for a health probe?  am I correct in thinking the probe is sent every 5 seconds, and must fail 3 times in order to failover?  Does the "Pass Detect" indicate that the server must be back online for 60 seconds before being placed back into the server farm?

Also if we have a primary server and a back up server (used if primary fails), if the primary fails and the backup server becomes active, will the primary server become available again when it comes back online, or will all connections continue to go to the backup?  Is there anyway to make the old primary the new backup when it comes back online?

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Cisco ACE Health Probes


You are right about Probe interval and fail detect, but Pass detect has two parameters:-interval and count, where interval defines the amount of time to wait for sending the probe back to failed server where as count paramater will control the minimum succefullt probe return from server for making it active again.

Regarding the backup server, once the prmary server comes online again all new connection will be redirected to it, while all existing connection will continue on existing one. I guess "inservice standby" will be the command of your interest in gracefully removing the primary and bringing the backup active.