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
Specify the area address and system ID for an IS-IS routing process. The last byte must be 00.
For more information about configuring a NET, refer to IS-IS Addressing.
3 Enter the interface configuration mode.
CONFIGURATION mode
interface interface
Intermediate System to Intermediate System 559
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