HP 3600 v2 series Configuration Manual page 149

Priority: DIS priority.
•
• LAN ID: Includes the system ID and a one-byte pseudonode ID.
Figure 56 shows the hello packet format on the point-to-point networks.
Figure 56 P2P IIH format
Instead of the priority and LAN ID fields in the LAN IIH, the P2P IIH has a Local Circuit ID field.
LSP packet format
The Link State PDU (LSP) carries link state information. LSP involves two types: Level- 1 LSP and Level-2 LSP.
The Level-2 LSPs are sent by the Level-2 routers, and the Level- 1 LSPs are sent by the Level- 1 routers. The
Level- 1 -2 router can send both types of LSPs.
The two types of LSPs have the same format.
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