Configure IS-IS Basic Function

Configuration Condition

Before using the IS-IS protocol, first complete the following tasks:

Configure the link layer protocol to ensure the normal communication at the link layer.
Configure the network layer IP address of the interface to enable the neighboring nodes to be reachable at the network layer.

Multiple IS-IS processes can operate at the same time in the system. Each process is identified by different process names.

Table 9-2 Enable the IS-IS protocol

Step	Command	Description
Enter the global configuration mode	configure terminal	-
Create the IS-IS process and enter the IS-IS configuration mode	router isis [area-tag ]	Mandatory By default, the IS-IS process does not operate in the system. The process name is area-tag.
Configure the network entity title for the IS-IS	net entry-title	Mandatory By default, the network entity title is not configured for the IS-IS.
Return to the global configuration mode	exit	-
Enter the interface configuration mode	interface interface-name	-
Enable the IS-IS protocol on the interface	ip router isis [area-tag ]	Mandatory By default, the IS-IS protocol is not enabled on the interface.

Multiple IS-IS processes can exist in the same VRF, but only one IS-IS process with Level-2 attribute in the VRF.

Table 9-3Configure the IS-IS VRF attribute

Step	Command	Description
Enter the global configuration mode	configure terminal	-
Enter the IS-IS configuration mode	router isis [ area-tag ]	-
Enter the VRF attribute for the IS-IS	vrf vrf-name	Optional By default, the IS-IS process locates at the global VRF.