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

Forum Discussion

Kranthi's avatar
Kranthi
Icon for Nimbostratus rankNimbostratus
Jan 07, 2020

VIP Failover and Failback Process with back end servers

Hi Team,   We got a typical requirement from client as below.   F5 Load Balancer VIP with 4 backend servers total, two servers with priority group 10 and 2 servers with priority group 5   the s...
application delivery
big-ip
LTM
Mitheor's avatar
Mitheor
Icon for Cirrus rankCirrus
Jan 08, 2020

Hi Kranthi,

 

i don´t think there is a way to achieve this via GUI.

 

One thing you could try is use "manual resume" for the priority group and a iRule to enable it again when needed.

 

So, in the end, it would work like this:

 

Priority group 10 --> "A"

Priority group 5 --> "B"

 

A is UP and B is standby.

A fails (and gets disabled).

B takes control of the traffic.

When B fails a iRules enables A again.

 

Does it makes sense?

 

Hope it helps.

 

Br

Kranthi's avatar
Kranthi
Icon for Nimbostratus rankNimbostratus
Jan 08, 2020

HI Mitheor,

 

Thanks for your update. but how we can perform auto disable and what will be the irule in such cases.

  • Mitheor's avatar
    Mitheor
    Icon for Cirrus rankCirrus
    Jan 08, 2020

    Hi,

     

    regarding manual resume:

     

    https://support.f5.com/csp/article/K83316932

     

    However, i´ve taking a look and it seems it´s not possible to change a node status via iRule.

     

    You could probably achieve this via iCall but it´s not an easy task i´m afraid.

     

    If a have more time these days i´ll try to think about it.

     

    Sorry mate.

     

    Br