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Lsa header format, Lsa formats – H3C Technologies H3C SR8800 User Manual

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Figure 30 LSAck packet format

LSA header format

All LSAs have the same header.

Figure 31 LSA header format

Major fields:

LS age—Time in seconds elapsed since the LSA was originated. An LSA ages in the LSDB (added
by 1 per second), but does not age during transmission.

LS type—Type of the LSA.

Link State ID—The contents of this field depend on the LSA's type.

LS sequence number—Used by other routers to judge new and old LSAs.

LS checksum—Checksum of the LSA except the LS age field.

Length—Length in bytes of the LSA, including the LSA header.

LSA formats

Router LSA