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NOTE:
When using the IS-IS routing protocol to exchange IPv6 routing information and to determine
destination reachability, you can route IPv6 along with IPv4 while using a single intra-domain routing
protocol. The configuration commands allow you to enable and disable IPv6 routing and to configure or
remove IPv6 prefixes on links.
Except where identified, the commands described in this chapter apply to both IPv4 and IPv6 versions of IS-
IS.
Configuration Tasks for IS-IS
The following describes the configuration tasks for IS-IS.
•
Enabling IS-IS
•
Configure Multi-Topology IS-IS (MT IS-IS)
•
Configuring IS-IS Graceful Restart
•
Changing LSP Attributes
•
Configuring the IS-IS Metric Style
•
Configuring IS-IS Cost
•
Changing the IS-Type
•
Controlling Routing Updates
•
Configuring Authentication Passwords
•
Setting the Overload Bit
•
Debuging IS-IS
Enabling IS-IS
By default, IS-IS is not enabled.
The system supports one instance of IS-IS. To enable IS-IS globally, create an IS-IS routing process and assign
a NET address. To exchange protocol information with neighbors, enable IS-IS on an interface, instead of on
a network as with other routing protocols.
In IS-IS, neighbors form adjacencies only when they are same IS type. For example, a Level 1 router never
forms an adjacency with a Level 2 router. A Level 1-2 router forms Level 1 adjacencies with a neighboring
Level 1 router and forms Level 2 adjacencies with a neighboring Level 2 router.
NOTE:
Even though you enable IS-IS globally, enable the IS-IS process on an interface for the IS-IS
process to exchange protocol information and form adjacencies.
To configure IS-IS globally, use the following commands.
1
Create an IS-IS routing process.
CONFIGURATION mode
router isis [tag]
tag: (optional) identifies the name of the IS-IS process.
2
Configure an IS-IS network entity title (NET) for a routing process.
ROUTER ISIS mode
net network-entity-title
Intermediate System to Intermediate System
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Troubleshooting
