Cisco NCS 5500 Series

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. commit
6. show isis [ instance instance-id ] protocol
DETAILED STEPS
Step 1 configure
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.
Step 3 net network-entity-title
Example:
RP/0/RP0/CPU0:router(config-isis)# net 47.0004.004d.0001.0001.0c11.1110.00
Configures network entity titles (NETs) for the routing instance.
• Specify a NET for each routing instance if you are configuring multi-instance IS-IS.
• This example configures a router with area ID 47.0004.004d.0001 and system ID 0001.0c11.1110.00.
• To specify more than one area address, specify additional NETs. Although the area address portion of the NET
differs, the systemID portion of the NET must match exactly for all of the configured items.
Step 4 is-type { level-1 | level-1-2 | level-2-only }
Example:
RP/0/RP0/CPU0:router(config-isis)# is-type level-2-only
(Optional) Configures the system type (area or backbone router).
• By default, every IS-IS instance acts as a level-1-2 router.
• The level-1 keyword configures the software to perform Level 1 (intra-area) routing only. Only Level 1 adjacencies
are established. The software learns about destinations inside its area only. Any packets containing destinations
outside the area are sent to the nearest level-1-2 router in the area.
• The level-2-only keyword configures the software to perform Level 2 (backbone) routing only, and the router
establishes only Level 2 adjacencies, either with other Level 2-only routers or with level-1-2 routers.
Routing Configuration Guide for Cisco NCS 5500 Series Routers, IOS XR Release 6.3.x
4
Implementing IS-IS
Enable IS-IS and Configure Level 1 or Level 2 Routing