Configuring area address attributes

About this task

The area-id command specifies the area address portion of the NET which is used to define the IS-IS area to which the router belongs. At least one area-id command should be configured on each router participating in IS-IS. A maximum of three area-id commands can be configured per router.

The area address identifies a point of connection to the network, such as a router interface, and is called a Network Service Access Point (NSAP). The routers in an area manage routing tables about destinations within the area. The Network Entity Title (NET) value is used to identify the IS-IS area to which the router belongs.

NSAP addresses are divided into three parts. Only the Area ID portion is configurable.

Procedure

Set the area ID.

A variable length field between 1 and 13 bytes long. This includes the Authority and Format Identifier (AFI) as the most significant byte and the area ID.
Set the system ID.

A six-byte system identification. This value is not configurable. The system ID is derived from the system or router ID.
Set the selector ID.

A one-byte selector identification that must contain zeros when configuring a NET. This value is not configurable. The selector ID is always 00.

Example The following example displays ISO addresses in IS-IS address format:
MAC address 00:a5:c7:6b:c4:9049.0011.00a5.c76b.c490.00 IP address: 218.112.14.5 49.0011.2181.1201.4005.00