334 CHAPTER 29: IS-IS CONFIGURATION
Figure 106 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 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 107.
Intradomain routing protocol discriminator
Reserved
Version
R
ID length
Version/Protocol ID extension
Length indicator
Maximum area address
R R PDU type
No. of Octets
1
1
1
1
1
1
1
1
Reserved/Circuit type
Source ID
Holding time
PDU length
Local Circuit ID
Variable length fields
1
ID length
2
2
1
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