An LTM Specialist defines a receive string in the HTTP monitor and then assigns it to the HTTP pool. The monitor has an interval of 5 seconds and a timeout of 16 seconds.
If the receive string is NOT seen in the the HTTP payload after 20 seconds, how does the LTM device mark the monitor status?
The LTM device will mark the monitor status as offline. With an interval of 5 seconds and a timeout of 16 seconds, the monitor will attempt to check the HTTP pool four times (at 0 seconds, 5 seconds, 10 seconds, and 15 seconds). If the receive string is not seen in the HTTP payload within this timeout period, the health check is considered to have failed, and the service will be marked as offline.
I think must be C Because after 20s LTM will wait for 1s total after 21s to mark the node down
A - Correct. BIG-IP system can mark a pool member Available if the health check succeeds or Offline if the health check fails. When you have the 5 second interval with a 16 second timeout this gives the service four tries to respond: 0 sec, 5 sec, 10 sec, 15 seconds. If no response is received or the receive string doesn’t match, then at 16 seconds the service is marked down. https://my.f5.com/manage/s/article/K16008 https://my.f5.com/manage/s/article/K350