HP MSR2000 series Configuration Manual page 81

Figure 33 Network LSA format
Major fields of the Network LSA are as follows:
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.
• Summary LSA
Network summary LSAs (Type-3 LSAs) and ASBR summary LSAs (Type-4 LSAs) are originated by
ABRs. Except for the Link state ID field, the formats of Type 3 and 4 summary-LSAs are identical.
Figure 34 Summary LSA format
Major fields of the Summary LSA are as follows:
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. It is 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 if the link state ID and network mask are set to
0.0.0.0.
AS external LSA
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