Configuring OSPF Stub Areas
Applicable Environment
Partitioning an AS into different areas reduces the number of LSAs. To further reduce the number of entries in routing tables and the number of LSAs to be transmitted in a non-backbone area, configure the non-backbone area on the border of the AS as a stub area.
Configuring a stub area is optional.
Note the following points when configuring a stub area:
- The backbone area (Area 0) cannot be configured as a stub area.
- If an area is to be configured as a stub area, all the switches in this area must be configured with stub attributes using the stub command.
- An ASBR cannot exist in a stub area to import AS external routes.
- Virtual links cannot exist in stub areas.
