Best Way to Do Active/Standby on f5

There may be couple of different ways you could do this.

 

1. Use Priority level within the pool members with minimum active member set to a desired number. This will essentially bring up the lower priority member in case the number of available higher priority members fall below minimum active member value (must be set to other than 0)

 

 

2. If this is HTTP service, then you can use Fallback Host feature in the HTTP Profile setting. This issues HTTP redirect to whatever destination you choose if all members are down.