Tunnel Interface Commands

The commands in this section describe how to create, delete, and manage tunnel interfaces.Several different types of tunnels provide functionality to facilitate the transition of IPv4 networks to IPv6 networks. These tunnels are divided into two classes: configured and automatic. The distinction is that configured tunnels are explicitly configured with a destination or endpoint of the tunnel. Automatic tunnels, in contrast, infer the endpoint of the tunnel from the destination address of packets routed into the tunnel.

interface tunnel

Use this command to enter the Interface Config mode for a tunnel interface. The <tunnel-id> range is 0 to 7.

• Format: interface tunnel <tunnel-id>
• Mode: Global Config

no interface tunnel

This command removes the tunnel interface and associated configuration parameters for the specified tunnel interface.

• Format: no interface tunnel <tunnel-id>
• Mode: Global Config

show interface tunnel

This command displays the parameters related to tunnel such as tunnel mode, tunnel source address and tunnel destination address.

• Format: show interface tunnel <tunnel-id>
• Mode: Privileged EXEC

If you do not specify a tunnel ID, the command shows the following information for each configured tunnel:

• Tunnel ID: The tunnel identification number.
• Interface: The name of the tunnel interface.
• Tunnel Mode: The tunnel mode.
• Source Address: The source transport address of the tunnel.
• Destination Address: The destination transport address of the tunnel.

If you specify a tunnel ID, the command shows the following information for the tunnel:

• Interface Link Status: Shows whether the link is up or down.
• MTU Size: The maximum transmission unit for packets on the interface.
• IPv6 Address/Length: If you enable IPv6 on the interface and assign an address, the IPv6 address and prefix display.