Configuration guidelines
Deleting a tunnel interface also removes the functions configured on this tunnel interface.
The source address and destination address of a tunnel uniquely identify a path. They must be configured at both ends of the tunnel and the source address at one end must be the destination address at the other end and vice versa.
The source address or interface and the destination address that are specified for the tunnel interface must be a public address or interface.
Tunnel interfaces using the same encapsulation protocol must have different source addresses and destination addresses.
If you configure a source interface for a tunnel interface, the tunnel interface takes the primary IP address of the source interface as its source address.
When configuring a route through the tunnel, you are not allowed to set up a static route whose destination address is in the subnet of the tunnel interface. Instead, you can do one of the following:
Configure a static route, using the address of the network segment the original packet is destined for as its destination address and the address of the peer tunnel interface as its next hop.
Enable a dynamic routing protocol on both the tunnel interface and the router interface connecting the private network, so that the dynamic routing protocol can establish a routing entry that allows the tunnel to forward packets through the tunnel.