Mar 27, 2026 - For details about updated CVE-2025-53521 (BIG-IP APM vulnerability), refer to K000156741.

Forum Discussion

Ayush_Gupta_332's avatar
Ayush_Gupta_332
Icon for Nimbostratus rankNimbostratus
Mar 05, 2018

'**Probe Interval** and '**Probe Timeout**

Hi Guys,   Could you please explain what does 'Probe Interval and 'Probe Timeout means in a Health Monitor? How is it different from Interval and Timeout? Appreciate your help. :)  
application delivery
BIG-IP DNS
Yann_Desmarest_'s avatar
Yann_Desmarest_
Icon for Nacreous rankNacreous
Mar 05, 2018

Hi,

 

There is a rule where Probe Timeout should be 3xProbe Interval + 1

 

Probe Interval is the Interval between two health check

 

Probe Timeout is the time if no response received the member or node will be marked down

 

Hope it helps

 

Yann

 

  • Ayush_Gupta_332's avatar
    Ayush_Gupta_332
    Icon for Nimbostratus rankNimbostratus
    Mar 05, 2018

    Lets say a health monitor is configured as below:

     

    Interval : 10 seconds Timeout : 31 seconds Probe Interval: 1 second Probe Timeout: 5 seconds

     

    Could you explain how these 4 things are related or how each parameter plays its role to determine the health of the end server? Considering both scenarios where the end server passes the health check and fails.

     

    Thanks again.