ive a doubt: currently we have various VIPs without default pool configure but with a policy applied that is doing some routing based on called host and specified URI. I need to understand if we put default pool on that VIP and the policy is not matched, the LTM will forward request to the default pool configured?
it depends on the policy. Very often there is a default rule that would catch all traffic that did not match any of the conditions and that would reset the traffic. If there is no such rule, the pool attached to the VS would be used.