H3C S7500E Series Ethernet Switches Operation Manual

Operation Manual – IPv4 Routing
H3C S7500E Series Ethernet Switches Chapter 4 IS-IS Configuration
4-9
z R(Reserved): Set to 0.
z PDU Type: For detail information, refer to Table 4-1.
z Version: Set to 1(0x01).
z Maximum Area Address: Maximum number of area addresses supported.
Table 4-1 PDU type
Type PDU Type Acronym
15 Level-1 LAN IS-IS hello PDU L1 LAN IIH
16 Level-2 LAN IS-IS hello PDU L2 LAN IIH
17 Point-to-Point IS-IS hello PDU P2P IIH
18 Level-1 Link State PDU L1 LSP
20 Level-2 Link State PDU L2 LSP
24 Level-1 Complete Sequence Numbers PDU L1 CSNP
25 Level-2 Complete Sequence Numbers PDU L2 CSNP
26 Level-1 Partial Sequence Numbers PDU L1 PSNP
27 Level-2 Partial Sequence Numbers PDU L2 PSNP
III. Hello
The hello packet is used by routers to establish and maintain the neighbor relationship.
It is also called IS-to-IS hello PDU (IIH). For broadcast network, the Level-1 router uses
the Level-1 LAN IIH; and the Level-2 router uses the Level-2 LAN IIH. The P2P IIH is
used on point-to-point network.
Figure 4-7 illustrates the hello packet format in broadcast networks, where the blue
fields are the common header.