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cisco ccna cloud worth it.As in 0SPFv2, the process ID uniquely identifies the OSPF process that the routing device is running (it is only locally meaningful and is not shared with other 0SPFv3 routing devices). The router ID is a 32-bit number, usually expressed using dotted decimal format. The area number is also a 32-bit number and can be expressed in decimal ( 12), or in dotted decimal format ( 0.0.0.12). Here is a simple example.ipv6 router 1 router-id 0.0.0.12 area 0When creating a router ID, I usually use the first byte to indicate which area the router belongs to. For ABR, set the first byte to 0 and use the second byte (and possibly the third byte) to indicate the area the router belongs to. The last byte is used to indicate the number of the router in the area. For example, if there is a backbone router (with all interfaces belonging to zone 0), its router ID might be 0.0.0.1; if there is an ABR connected to zone 1, its router ID might be 0XPXP 0.5. This allows me to quickly identify the router and the role it plays. In OSPFv3, you must manually specify the router ID, while in OSPFv2 this is optional. But even in OSPFv2, I sometimes use this method to specify the router ID.OSPFv3 Interface ConfigurationAfter configuring the global parameters of 0SPFv3, the interface must be added to the process. In 0SPFv2, the command network is used in the routing process to accomplish this task, but OSPFv3, similar to RIPng, requires you to perform this configuration on the interface.IOS(config)# interface type [slot_#/]port_# IOS(config-if)# ipv6 ospf process_ID area area_numberSimple OSPFv3 Configuration ExampleThe following configuration example adds two interfaces to area 0.IOS(config)# ipv6 unicast-routing IOS(config)# ipv6 router ospfv3 1 IOS(config-router)# router-id 0.0.0.1 IOS(config-router)# area 0 IOS(config- router)# exit IOS(config)# interface gl/0/1 IOS(config-if)# ipv6 ospf 1 area 0 IOS(config-if)# exit IOS(config)# interface gl/0/2 IOS(config-if)# ipv6 ospf 1 area 0 IOS(config-if)# exitAs you can see, the configuration is very simple. Don't forget that Cisco device interfaces can participate in OSPFv3 even without a global IPv6 address - as long as they have a link-local address, which is obtained automatically. Of course, the prerequisite is that IPv6 is globally enabled, and the interface is enabled.