Configuring an OSPF Interface to Automatically Adjust the Link Cost
Configuring an OSPF interface to automatically adjust the link cost based on link quality facilitates route selection control and improves network reliability.
Context
A bit error refers to the deviation between a bit that is sent and the bit that is received. The bit error rate (BER) refers to the number of bit errors divided by the total number of bits transferred during a studied time interval. During data transmission, a high BER will degrade or even interrupt services in extreme cases.
To prevent this problem, configure OSPF interfaces to automatically adjust link costs based on link quality so that unreliable links are not used by the optimal routes.
Procedure
- Run system-view
The system view is displayed.
- Run interface interface-type interface-number
The interface view is displayed.
- Run ospf enable [ process-id ] area area-id
OSPF is enabled on the interface.
- Run ospf link-quality low incr-cost { cost | max-reachable }
The OSPF interface is configured to automatically adjust the link cost based on link quality.
The cost parameter specifies the link cost adjustment value. After this parameter is specified:
- If the link quality changes to low, the link cost equals the original link cost plus the adjustment value. The maximum link cost allowed is 65535.
- If the link quality recovers from low, the original link cost applies.
- Run commit
The configuration is committed.