The preference command sets the preference for an OSPFv3 route.
The undo preference command restores the default setting.
By default, the preference of the OSPFv3 route is 10. When ASE is specified, the default value is 150.
| Parameter | Description | Value |
|---|---|---|
| ase | Sets the preference for an AS external route or an NSSA route. | - |
| preference | Specifies the preference for OSPFv3 routes. | It is an integer ranging from 1 to 255. |
| route-policy route-policy-name | Specifies the name of a routing policy and sets the preference for specified routes. | The name is a string of 1 to 40 case-sensitive characters, with spaces not supported. When double quotation marks are used around the string, spaces are allowed in the string. |
Usage Scenario
The smaller the preference value, the higher the preference.
Multiple dynamic routing protocols may be run on a switch at the same time. Consequently, there is a problem of sharing and selecting routing information among routing protocols. Therefore, the system sets a default reference for each routing protocol. If different routing protocols find multiple routes to the same destination, the route discovered by the routing protocol with a higher preference is selected to forward IP packets.
Precautions
Creating a route-policy before it is referenced is recommended. If a nonexistent route-policy is referenced using the command, the configured priority applies to all OSPFv3 routes.