interface

Places CNA into interface configuration mode (config-if) for the specified interface.

interface { ethernet <num>/<port> | tunnel <id> }
 
no interface { ethernet <num>/<port> | tunnel <id> }
 

• num--slot number in which module is inserted in a 5000 series device, or subsystem of module in a 3000 series device or generic installation of CNA
• port--port number of interface being configured
• id--integer identifying the GRE tunnel

Must be in configuration mode (config), which requires privileged-level access.

Available for use multiple times in the configuration.

The interface command is used to configure the address of a Ethernet or GRE tunnel interface.

The CNA architecture allows multiple modules to be configured on a single interface.

While in interface configuration mode, you can use any of the following commands to define the interface:

• description
• duplex
• ip access-group
• ip address
• ip mtu
• ip route
• module
• speed
• tunnel

Use the no form of the command to remove the interface definition from the configuration (use the shutdown command to temporarily disable the interface without removing commands from the configuration).

Ethernet interfaces are identified by slot or subsystem number--the physical interface between card and chassis--and ethernet port number.

Slot numbers correspond to the numbered slots in the chassis into which the removable modules are physically inserted.

GRE tunnels provide a direct connection between a USTAT’s Ethernet interface and an interface on a router, thereby avoiding intervening routing issues.

Tunnel IDs must be unique; no two tunnels can have the same id value. (In older versions of CNA, tunnels defined on a series 5000 removable module could reuse an ID number of a tunnel configured on a different module; but this method of creating tunnels is no longer possible and cannot be used in any longer. Tunnel IDs must not clash between tunnels created on a USTAT and tunnels created at the interface level.)

After you have created a tunnel with the interface command, you can associate it with a USTAT by specifying the tunnel ID as the interface argument of the ip route command within the USTAT module’s configuration block.

Each tunnel must have a unique source/destination address pair. Use the tunnel command with the appropriate keyword to define these addresses.

You must define a destination address. If you don’t specify a source address, the Ethernet of the tunnel’s USTAT module will be assumed.

If multiple USTATs are configured on a single Ethernet interface, you should specify a unique private-space address as the tunnel source when you define the GRE tunnels. Otherwise, the tunnels would all assume the same Ethernet address as their respective source addresses, which is not allowed.