Yes I have seen that document and it appears to be a policy based configuration. I am looking to use an IPsec tunnel to connect an SRX210 to an MX104. I want to use a route based VPN that allows me to run a routing protocol across it. The configuration on the link uses policy to direct traffic across the tunnel rather than binding an interface that will become one end of a point to point link. On an SRX this would be the st0 interface.