Configuring a NET
Context
NET is the special form of the network service access point (NSAP). After the IS-IS view is displayed, IS-IS can start only when a NET is configured for an IS-IS process.
Generally, you only need to configure one NET for an IS-IS process. When an area needs to be redefined, for example, the area needs to be merged with other areas or divided into sub-areas, configure multiple NETs to ensure route correctness. A maximum of three area addresses can be configured for an IS-IS process. Therefore, a maximum of three NETs can be configured for an IS-IS process. When configuring multiple NETs, ensure that their system IDs are the same.
Procedure
- Run system-view
The system view is displayed.
- Run isis [ process-id ]
The IS-IS process view is displayed.
- Run network-entity net
A NET is configured.
Configuring loopback interface addresses based on NETs is recommended to ensure that a NET is unique on the network. If NETs are not unique, route flapping will easily occur.
An area ID uniquely identifies an area in the same IS-IS domain. All routers in the same Level-1 area must share the same area ID, while routers in the same Level-2 area can have different area IDs.