Tunnel Source and Destination Reachability

A tunnel has a source and destination tunnel interface associated with it. The source interface can be a VLAN or loopback interface on the router, but is usually a loopback interface. The tunnel source interface must be in an up state and the destination IP address must be reachable for the tunnel to be operational. Reachability can be achieved by creating a static route on the local router to the tunnel destination address or by means of a supported routing protocol such as RIP or OSPF, or on the S-Series BGP.

This example shows how to create a static route to the tunnel destination address of 99.99.99.1 using VLAN 50:

System(su-config)->ip route 99.99.99.1/32 vlan 50

With the static route configured, ping the destination address using the ping command to assure reachability.