H3C S5800 Series Configuration Manual page 163

Figure 5-6 PDU common header format
Intradomain routing protocol discriminator
Length indicator
Version/Protocol ID extension
ID length
R R R
Version
Reserved
Maximum area address
Intradomain Routing Protocol Discriminator: Set to 0x83.
Length Indicator: Length of the PDU header in bytes, including both common and specific
headers.
Version/Protocol ID Extension: Set to 1(0x01).
ID Length: Length of the NSAP address and NET ID.
R(Reserved): Set to 0.
PDU Type: For details, see
Version: Set to 1(0x01).
Maximum Area Address: Maximum number of area addresses supported.
Table 5-1 PDU type
Type
15
16
17
18
20
24
25
26
27
Hello
Hello packets are used by routers to establish and maintain neighbor relationships. A hello packet is
also called an IS-to-IS hello PDU (IIH). For broadcast networks, the Level-1 routers use the Level-1
PDU type
Table 5-1.
Level-1 LAN IS-IS hello PDU
Level-2 LAN IS-IS hello PDU
Point-to-Point IS-IS hello PDU
Level-1 Link State PDU
Level-2 Link State PDU
Level-1 Complete Sequence Numbers PDU
Level-2 Complete Sequence Numbers PDU
Level-1 Partial Sequence Numbers PDU
Level-2 Partial Sequence Numbers PDU
No. of Octets
1
1
1
1
1
1
1
1
PDU Type
5-8
Acronym
L1 LAN IIH
L2 LAN IIH
P2P IIH
L1 LSP
L2 LSP
L1 CSNP
L2 CSNP
L1 PSNP
L2 PSNP