2. Associate router-LSAs and record the prefix information about routers in the current
area, all Loopback interfaces, point-to-point links, point-to-multipoint links, virtual links
and stub networks.
Other main changes of LSA association:
LSA flooding scope change
In the OSPFv2, the LSA flooding includes flooding inside areas and flooding inside the AS.In
the OSPFv3, local link flooding scopes occur. Type 8 Link-LSAs is the type that can flood
only inside a local link flooding scope.
Handling an unknown LSA type
This is an improvement made by the OSPFv3 based on the OSPFv2.
In the OSPFv2, when establishing an adjacency relation, you need to synchronize
databases. If there is an irrecognizable LSA type in the database description packet, then
you are unable to normally establish the adjacency relation. If there is an irrecognizable LSA
type in a link-state updating packet, then the type of LSAs will be discarded.
In the OSPFv3, it is allowed to receive an unknown LSA type. By using the information
recorded in the LSA header, we can determine how to handle received unrecognizable LSA
type.
34.1.2 Interface Configuration
In the OSPFv3, the change based on interface configuration is as follows:
1. If an interface need participate in the running of OSPFv3, it must have been directly
started under the interface configuration mode. In the OSPFv2, the interface is
indirectly started via a network command under the OSPF route configuration mode.
2. If a configuration interface participates in the running of OSPFv3, then all addresses on
the interface must participate in the running of the IPv6.In the OSPFv2, all addresses
must be started via a network command.
3. In the environment where the OSPFv3 runs, when multiple OSPF entities can run on a
same link, different devices connected by this link can select to participate in the
running of an OSPF entity. The OSPFv2 does not support the function.
34.1.3 Router ID Configuration
Each device running the OSPFv3 process must be identified with a router ID in the IPv4
address format.
Unlike the OSPFv2, the OSPFv3 process will automatically acquire an IPv4 address as the
router ID. After the device starts the OSPFv3 process, a user must use the router-id
command to configure the router ID for the OSPFv3 process. Otherwise, the OSPFv3
process will not be able to start.
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