H3C Technologies H3C SecPath F1000-E - Manual (Page 310)

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Figure 16 Network LSA format
Major fields:
• Link State ID: The interface address of the DR
• Network mask: The mask of the network (a broadcast or NBMA network)
• 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 17 Summary LSA format
Major fields:
• 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.
• Network mask: The network mask for the type 3 LSA; set to 0.0.0.0 for the Type-4 LSA
• Metric: The metric to the destination
NOTE:
A Type-3 LSA can be used to advertise a default route, having the Link State ID and Network Mask set to
0.0.0.0.