H3C S7500E Series Ethernet Switches Operation Manual

Operation Manual – IPv4 Routing
H3C S7500E Series Ethernet Switches Chapter 4 IS-IS Configuration
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Figure 4-8 P2P IIH format
Instead of the priority and LAN ID fields in the LAN IIH, the P2P IIH has a Local Circuit
ID field.
IV. LSP packet format
The Link State PDUs (LSP) carries link state information. There are two types: Level-1
LSP and Level-2 LSP. The Level-2 LSP is sent by the Level-2 router, and the Level-1
LSP is sent by the Level-1 router. The level-1-2 router can sent both types of the LSPs.
Two types of LSPs have the same format, as shown in
Figure 4-9.