iRule for load balancing to different virtual server depending on the URI path

Hi Guys,

I have three Virtual Server to be configured on our LTM's which are running on the version 15.1.7. One virtual server is facing to client (let say VS-A) and contains two virtual server (let say VS-B and VS-C) that should be load balance.

VS-B and VS-C need to load balance on the VS-A but the incoming traffic should be clasify use the uri /path.

The conditions like this:

if the uri contains /aa, /bb, /cc will be forward and load balance to VS-B and VS-VS-C.

I tried to make irules like this:

when HTTP_REQUEST {
if { [HTTP::uri] contains "/aa,/bb,/cc" } {
virtual VS_B
} else {
virtual VS_C
}
}

But the results is traffic from the client always going to the VS-B, so the load balancing doesn't have running.

I don't know it can be configured with the iRules or not, since I am not an expert in writing the iRules can anyone suggest me with the iRules that helps working the VIP as mentioned above.

Appreciate any kind your insight.

Thanks