Configuring the Device Level

Configuring a device level specifies an area for a routing device.

Configure the device level according to network planning requirements:

When the level of a device is Level-1, the device establishes neighbor relationships with only Level-1 and Level-1-2 routers in the same area and maintains only Level-1 LSDBs.
When the level of a device is Level-2, the 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.
When the level of a device is Level-1-2, the device can establish neighbor relationships with Level-1 and Level-2 routers and maintain Level-1 and Level-2 LSDBs.

Access the system view.
system-view
Access the IS-IS process view.
isis [ process-id ]
Set the level of a router.
is-level { level-1 | level-1-2 | level-2 }

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