Transport VR Definition

The transport VR definition includes:

Transport virtual router name—Name of the transport virtual router. If not explicitly configured, the operational VR is assumed.
Tunnel source endpoint—IP address or FQDN used as the tunnel source endpoint on this end of the tunnel. In the case of signaled tunnels, the router monitors and transmits on port 500 of this address for IKE negotiations. The tunnel source endpoint must be a configured IP address or FQDN on the transport VR, or the router indicates an error. See Transport VR Definitions with an FQDN for information about using an FQDN rather than an IP address.
Tunnel destination endpoint—IP address or FQDN associated with the termination or initiation point of the secure IP tunnel. This address must be routable within the context of the transport VR. Each secure IP tunnel can have a different remote IP address.