Router IDs sometimes must be changed, for example, if the network administrator has established a new router ID identification scheme. However, after an OSPFv3 router establishes a router ID, that router ID cannot be changed until the router is reloaded or the OSPF process is cleared.
In Figure 1, notice that the current router ID is 10.1.1.1. The OSPFv3 router ID should be 1.1.1.1.
In Figure 2, the router ID 1.1.1.1 is being assigned to R1.
Note: Clearing the OSPF process is the preferred method to reset the router ID.
In Figure 3, the OSPF routing process is cleared using the clear ipv6 ospf process privileged EXEC mode command. Doing this forces OSPF on R1 to renegotiate neighbor adjacencies using the new router ID.
The show ipv6 protocols command verifies that the router ID has changed.
Use the Syntax Checker in Figure 4 to modify the router ID for R1.