Specifications

Implementing IS-IS on Cisco IOS XR Software
How to Implement IS-IS on Cisco IOS XR Software
RC-180
Cisco IOS XR Routing Configuration Guide
• Setting the Priority for Adding Prefixes to the RIB, page RC-213 (optional)
• Configuring IP Fast Reroute Loop-free Alternate, page RC-215 (optional)
Note To save configuration changes, you must commit changes when the system prompts you.
Enabling IS-IS and Configuring Level 1 or Level 2 Routing
This task explains how to enable IS-IS and configure the routing level for an area.
Note Configuring the routing level in Step 4 is optional, but is highly recommended to establish the proper
level of adjacencies.
Prerequisites
Although you can configure IS-IS before you configure an IP address, no IS-IS routing occurs until at
least one IP address is configured.
SUMMARY STEPS
1. configure
2. router isis instance-id
3. net network-entity-title
4. is-type {level-1 | level-1-2 | level-2-only}
5. end
or
commit
6. show isis [instance instance-id] protocol
DETAILED STEPS
Command or Action Purpose
Step 1
configure
Example:
RP/0/RP0/CPU0:router# configure
Enters global configuration mode.
Step 2
router isis instance-id
Example:
RP/0/RP0/CPU0:router(config)# router isis isp
Enables IS-IS routing for the specified routing instance, and
places the router in router configuration mode.
• By default, all IS-IS instances are automatically
Level 1 and Level 2. You can change the level of
routing to be performed by a particular routing instance
by using the is-type router configuration command.