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bapho1337_25353's avatar
bapho1337_25353
Icon for Nimbostratus rankNimbostratus
Mar 09, 2016

LTM Policy - LB does still use a policy rule with an forward to pool action when all pool members are down

Dear all,   I've a strange behavior with my LTM running on 11.5.1HF5.   The following polices are currently configured :   Strategy : First Match Requires : HTTP Controls : Forwarding   ...
application delivery
BIG-IP
LTM
Kai_Wilke's avatar
Kai_Wilke
Icon for MVP rankMVP
Mar 09, 2016

Hi Christopher,

 

the LTM policy based pool selection will not care about the availability of the pool. It would just select the pool as specified by you policy and also won't skip any rules.

 

But your requirement can be solved by using the Priority Group & Priority Group Activation features.

 

https://support.f5.com/kb/en-us/products/big-ip_ltm/manuals/product/ltm-concepts-11-1-0/ltm_pools.html1216212

 

Simply add each of your nodes to each of your pools and then increase the priority of the "default" node. In this case the request will be only send to the default node. And if this node is marked down, then the remaining pool will be used as fallback.

 

Note: In a best-match/first-match strategy you don't need to exclude the already processed URI (see your Rule 4). Just let the rule order or best-match engine do their work...

 

Cheers, Kai