H3C S7500E Series Ethernet Switches Operation Manual

Operation Manual – IPv4 Routing
H3C S7500E Series Ethernet Switches Chapter 3 OSPF Configuration
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requesting the missing LSAs. The packets contain the digests of the missing LSAs. The
following figure shows the LSR packet format.
Figure 3-12 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.
V. 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 3-13 LSU packet format