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DES-7200 Configuration Guide Chapter 5 OSPF
Configuration
5-3
Link-LSAs (Type 8)
In the OSPFv3, the newly added LSA type is generated by each device for each
connected link and describes the local link address of the device in the current
link and all set IPv6 address prefix information.
Intra-Area-Prefix-LSAs (Type 9)
In the OSPFv3, the newly added LSA type provides additional address
information for Router-LSAs or Network-LSAs. Therefore, it has two effects:
1） Associate network-LSAs and record the prefix information of a transit
network.
2） Associate router-LSAs and record the prefix information on all
Loopback interfaces, point-to-point links, point-to-multipoint links,
virtual links and stub networks of the router in the current area.
Other main change of LSA association:
LSA flooding scope
In the OSPFv2, the LSA flooding occurs inside areas and ASs. In the OSPFv3,
flooding occurs in local link. Type 8 Link-LSAs is the type that can flood only
inside a locla link.
Handling an unknown LSA type
This is an improvement made by the OSPFv3 based on the OSPFv2.
In the OSPFv2, database synchronization is necessary in the initial establishment
of adjacency relationship. If there is an unrecognizable LSA type in the database
description message, this relationship cannot be established properly. If there is
an unrecognizable LSA type in a link-state updating message, 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 the
received unrecognizable LSA type.
5.1.2 Interface Configuration
In the OSPFv3, the change based on interface configuration is as follows:
In order for an interface to run OSPFv3, enable the OSPFv3 directly in the
interface configuration mode. For OSPFv2, however, run the network
command in the OSPF route configuration mode.
If an interface runs OSPFv3, all the addresses on the interface will run IPv6.
In the OSPFv2,however, all the addresses are enabled via a network
command.