Longest Match Routing
With other network vendors I can override a local interface by using a longer bit match for the prefix/mask.
Say I have 172.16.0.0/24 and 172.16.1.0/24 at site 1 but I want to reach 172.16.0.10/32 at site 2 from 172.16.1.0/24 over the VPN tunnel. I can create the specific host route and create a /32 phase 2 SA.
The problem I am seeing is that the /32 does not override a locally configured interface with a shorter mask length. Even if I disable site 1s 172.16.0.0/24 interface, nothing will route over the tunnel. If I change the address on the site 1 interface to something not in that range then it works.
At the very least I would expect that disabling the site 1 interface would allow me to route over the VPN to site 2.
This is on 6.2.7