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

Forum Discussion

David__Pasch's avatar
David__Pasch
Icon for Altostratus rankAltostratus
Nov 13, 2017

Disabling VIP based on pool member availability.

Hey guys! I got one that seemed easy on the surface, but I haven't been able to come up with a graceful solution. I have a very typical set up. 2 HTTPS VIPs, and a WIP. Customer wants to mark the VI...
application delivery
BIG-IP DNS
LTM
Patrik_Jonsson's avatar
Patrik_Jonsson
Icon for MVP rankMVP
Nov 13, 2017

Could this work?

https://devcentral.f5.com/wiki/iRules.nodes_up.ashx

iRule example from the wiki:

when DNS_REQUEST {
  if { [nodes_up 10.10.10.10 80] < 4 } {
    pool pool-example-com-backup
  }
}

I also had an idea about using an iRule and IP aliases, but I think that would be more complex than this.

/Patrik