Before You Begin
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.
commit
6.
show isis [ instance instance-id ] protocol
DETAILED STEPS
PurposeCommand or Action
configure
Step 1
Enables IS-IS routing for the specified routing instance, and places
the router in router configuration mode.
router isis instance-id
Example:
RP/0/RSP0/CPU0:router(config)# router isis
isp
Step 2
•
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.
Configures network entity titles (NETs) for the routing instance.
net network-entity-title
Step 3
Example:
RP/0/RSP0/CPU0:router(config-isis)# net
47.0004.004d.0001.0001.0c11.1110.00
•
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.
(Optional) Configures the system type (area or backbone router).is-type { level-1 | level-1-2 | level-2-only }
Step 4
Example:
RP/0/RSP0/CPU0:router(config-isis)# is-type
level-2-only
•
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.
Cisco ASR 9000 Series Aggregation Services Router Routing Configuration Guide, Release 5.1.x
286 OL-30423-03
Implementing IS-IS
Enabling IS-IS and Configuring Level 1 or Level 2 Routing
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