Configuring a Device Level

Context

Configure a device level according to network planning requirements:

A Level-1 device can establish neighbor relationships with only Level-1 and Level-1-2 routers in the same area and maintains only Level-1 LSDBs.
A Level-2 device can establish neighbor relationship with Level-2 routers in the same area or different areas and with Level-1-2 routers in different areas and maintain only Level-2 LSDB.
A Level-1-2 device can establish neighbor relationships with Level-1 and Level-2 routers and maintain Level-1 and Level-2 LSDBs.

If the levels of IS-IS devices are changed during network operation, the IS-IS process will be restarted, and IS-IS neighbor relationships will be disconnected. Setting the levels of devices when configuring IS-IS is recommended.

Procedure

Run system-view
The system view is displayed.
Run isis [ process-id ]
The IS-IS process view is displayed.
Run is-level { level-1 | level-1-2 | level-2 }
A level is configured for the switch.

By default, the level of the switch is Level-1-2.