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

Forum Discussion

Bill_Mayo's avatar
Bill_Mayo
Icon for Nimbostratus rankNimbostratus
Mar 08, 2017

Best Practice for GTM/LTM Monitors

I am having some trouble understanding the interaction of the health monitors on a GTM vs the associated LTM and the best way to be sure that a node/service is up without sending it unnecessary traff...
application delivery
BIG-IP DNS
LTM
Vijay_E's avatar
Vijay_E
Icon for Cirrus rankCirrus
Mar 09, 2017

Let the LTM monitor the pool members. GTM will obtain the status of the pool members, assuming proper synchronization.

 

In my opinion, there isn't a real need for GTM to send monitors to LTM's pool members. I have utilized GTM monitors only when there are non-F5 devices like servers or non-F5 load balancer.

 

  • michaelvoight's avatar
    michaelvoight
    Icon for Nimbostratus rankNimbostratus
    May 03, 2023

    Correct, for this to happen the GTM must have bigip monitor configured for the Servers (which are LTMs). Then the use the LTM VIPs as the vservers on the GTM. The LTM will report the status of the VIPs to the GTM (to determine which vservers are up)  The vserver makes up the GTM pool.  WideIP passes out address based on the pool member addresses, which are actually the LTM VIP addresses