3Com S7906E Command Reference Manual page 996

Description
Use the preference command to specify a preference for OSPFv3 routes.
Use the undo preference command to restore the default.
By default, the preference for OSPFv3 internal routes is 10, and that for OSPFv3 external routes is 150.
The smaller the value is, the higher the preference is.
A router may run multiple routing protocols. Each protocol has a preference. When several routing
protocols find multiple routes to the same destination, the route found by the protocol with the highest
preference is selected.
Examples
# Set a preference of 150 for OSPFv3 routes.
<Sysname> system-view
[Sysname] OSPFv3
[Sysname-OSPFv3-1] preference 150
router-id
Syntax
router-id router-id
undo router-id
View
OSPFv3 view
Default Level
2: System level
Parameters
router-id: 32-bit router ID, in IPv4 address format.
Description
Use the router-id command to configure the OSPFv3 router ID.
Use the undo router-id command to remove a configured router ID.
Router ID is the unique identifier of a device running an OSPFv3 process in the autonomous system.
The OSPFv3 process cannot run without a Router ID.
Make sure that different processes have different Router IDs.
Related commands: ospfv3.
By configuring different router IDs for different processes, you can run multiple OSPFv3 processes on a
router.
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