Operation Manual – IPv4 Routing
H3C S3610&S5510 Series Ethernet Switches
Chapter 4 IS-IS Configuration
4-11
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
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.
