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set_device_name ?
Under Pool memebers you can enable the Priority group activation.and give the number of servers you want to recive the traffic. In your case you can provide with the number 3, Basically what happens is if the servers in pool members goes down less then 3 then the back up server comes in to picture.
And Their is a way to setup your BIG IP to generate a msg if your server fails on the probe( can be done through irule also). Hope this helps.
-Kevin.
Graham,
Expired Timestamp violation will indeed happen in this case. TS cookie set in response contains the encrypted timestamp which is compared by ASM with the current time on the next request. If TS cookie is "too old" (more than 600 seconds/10 minutes) Expired Timestamp violation will be generated - this prevents replay attacks (hackers using stolen HTTP requests of a user and then trying to replay them).
The expiration period can be controlled by cookie_expiration_time_out parameter in the ASM Advanced config.
Information about ASM cookies can be found here:
https://support.f5.com/csp/article/K6850
The config you are describing is problematic from ASM point of view, there should really be an irule redirecting requests to abcdef.com to xyz.abcdef.com
Hope this helps,
Sam
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