Enable IS-IS and Configure 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. |
![]() Note |
Users can configure the no max-metric command only with levels 1 or 2, that is, no max-metric level {1|2} in order to view the result in the output of the show configuration command. Else, the maximum metric configuration is not displayed in the output. This behavior is observed before committing the configuration to the router. |
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
- configure
- router isis instance-id
- net network-entity-title
- is-type { level-1 | level-1-2 | level-2-only }
- commit
- show isis [ instance instance-id ] protocol
DETAILED STEPS
Step 1 |
configure |
Step 2 |
router isis instance-id Example:
Enables IS-IS routing for the specified routing instance, and places the router in router configuration mode.
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Step 3 |
net network-entity-title Example:
Configures network entity titles (NETs) for the routing instance.
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Step 4 |
is-type { level-1 | level-1-2 | level-2-only } Example:
(Optional) Configures the system type (area or backbone router).
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Step 5 |
commit |
Step 6 |
show isis [ instance instance-id ] protocol Example:
(Optional) Displays summary information about the IS-IS instance. |