H3C Technologies H3C S10500 Series Switches - Manual (Page 83)

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Figure 30 LSAck packet format
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LSA header format
All LSAs have the same header.
Figure 31 LSA header format
Major fields of the LSA header are as follows:
• 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.
Formats of LSAs
1. Router LSA