H3C Technologies H3C S7500E Series Switches - Manual (Page 82)

4-13
Figure 4-12 LSR packet format
Major fields:
z LS type: Type number of the LSA to be requested. Type 1 for example indicates the Router LSA.
z Link State ID: Determined by LSA type.
z Advertising Router: ID of the router that sent the LSA.
LSU packet
LSU (Link State Update) packets are used to send the requested LSAs to peers, and each packet
carries a collection of LSAs. The LSU packet format is shown below.
Figure 4-13 LSU packet format
Version 4
Router ID
Area ID
Checksum AuType
Packet length
Authentication
Authentication
Number of LSAs
LSA
0 7 15 31
LSA
LSAck packet
Link State Acknowledgment (LSAck) packets are used to acknowledge received LSU packets by
carrying LSA headers to describe corresponding LSAs. Multiple LSAs can be acknowledged in a single
LSAck packet. The following figure gives its format.