H3C Technologies H3C S12500 Series Switches - Manual (Page 155)

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• Priority—DIS priority.
• LAN ID—Includes the system ID and a 1-byte pseudonode ID.
Figure 59 shows the hello packet format on the point-to-point networks.
Figure 59 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
The Link State PDUs (LSP) carry 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, as shown in
Figure 60 .