H3C Technologies H3C SecPath F1000-E - Manual (Page 308)

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Figure 13 LSAck packet format
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LSA header format
All LSAs have the same header, as shown in the following figure.
Figure 14 LSA header format
Major fields:
• LS age: Time in seconds elapsed since the LSA was originated. A LSA ages in the LSDB (added by
1 per second), but does not in 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.
Formats of LSAs
1. Router LSA