active standby members within a pool???

for irule, i think you may create 2 pools; one (e.g. pool1) contains server1, server3 and server5 without health monitor but the other one (e.g. pool2) has.

 

 

then assign pool1 to virtual server. in LB_SELECTED, check whether selected pool member is marked down in pool2. if so, use node or pool command to direct traffic to its backup server.

 

 

LB::server wiki

 

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

 

 

LB::status wiki

 

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

 

 

node wiki

 

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

 

 

pool wiki

 

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