Need to create and i-rule which directs traffic coming from these 3 IP address to btsxv-old-pool and the rest of the traffic goes to btsxv-new-pool.

**Create data group: my_ip_db --or whatever name you want and add your IP's: 209.177.18.1 209.177.18.2 209.177.18.3

iRule:

when HTTP_REQUEST {
    if { [class match [IP::client_addr] equals my_ip_dg] } {
        pool btsxv-old-pool}
else {pool btsxv-new-pool}
    }
}