Introduction to OSPF 287
Figure 86 LSAck packet format
LSA header format
All LSAs have the same header, as shown in the following figure.
Figure 87 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.
...
Version 5
Router ID
Area ID
Checksum AuType
Packet length
Authentication
Authentication
LSA header
0 7 15 31
LSA header
LS age
Linke state ID
Advertising Router
Options LS type
LS sequence number
LS checksum Length
0715 31
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