System information

Configuring IS-IS
10-3
• The first portion of the NET address is the area number, which is a variable
number from 1 through 13 bytes. The first byte of the area number (01) is the
authority and format indicator (AFI). The next bytes are the assigned domain
(area) identifier, which can be from 0 through 12 bytes. In the example above, the
area identifier is 0001.
• The next six bytes form the system identifier (SYSID). The SYSID can be any six
bytes that are unique throughout the entire domain. The system identifier
commonly is either the Media Access Control (MAC) address or the IP address
expressed in binary-coded decimal (BCD).
• The last byte (00) is the n-selector.
3. Use the interface command in Global Configuration mode to select the interface
on which you plan to configure IS-IS.
MOT(config)#interface <type> <slot> / <interface>
where:
type is the BSR interface type.
slot is the module number.
interface is the interface number on which IS-IS is configured.
4. Use the ip router isis command in Interface Configuration mode to enable IS-IS
routing on the interface, as shown below:
MOT(config-if)#ip router isis
- or -
Use the ip router isis passive command in Interface Configuration mode to
allow the IS-IS interface to receive IS-IS network information, but not
send IS-IS network information, as shown below:
MOT(config-if)#ip router isis passive