H3C S7500E Series Ethernet Switches Operation Manual

Operation Manual – IPv4 Routing
H3C S7500E Series Ethernet Switches Chapter 3 OSPF Configuration
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Figure 3-17 Network LSA format
Major fields:
z Link State ID: The interface address of the DR
z Network Mask: The mask of the network (a broadcast or NBMA network)
z Attached Router: The IDs of the routers, which are adjacent to the DR, including
the DR itself
3) Summary LSA
Network summary LSAs (Type-3 LSAs) and ASBR summary LSAs (Type-4 LSAs) are
originated by ABRs. Other than the difference in the Link State ID field, the format of
type 3 and 4 summary-LSAs is identical.
Figure 3-18 Summary LSA format
Major fields:
z Link State ID: For a Type-3 LSA, it is an IP address outside the area; for a type 4
LSA, it is the router ID of an ASBR outside the area.
z Network Mask: The network mask for the type 3 LSA; set to 0.0.0.0 for the Type-4
LSA
z metric: The metric to the destination