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Configuring the Device Level
Context
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 Level-1 neighbor relationships with Level-1 and Level-1-2 routers in the same area. It can also establish Level-2 neighbor relationships with Level-2 and Level-1-2 routers in different areas. A Level-1-2 router maintains two LSDBs: a Level-1 LSDB and a Level-2 LSDB. The Level-1 LSDB saves for intra-area routing and the Level-2 LSDB saves for inter-area routing.
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.