H3C Technologies H3C S7500E Series Switches - Manual (Page 158)

5-13
Figure 5-13 CLV format
Table 5-2 shows that different PDUs contain different CLVs.
Table 5-2 CLV name and the corresponding PDU type
CLV Code Name PDU Type
1 Area Addresses IIH, LSP
2 IS Neighbors (LSP) LSP
4 Partition Designated Level2 IS L2 LSP
6 IS Neighbors (MAC Address) LAN IIH
7 IS Neighbors (SNPA Address) LAN IIH
8 Padding IIH
9 LSP Entries SNP
10 Authentication Information IIH, LSP, SNP
128 IP Internal Reachability Information LSP
129 Protocols Supported IIH, LSP
130 IP External Reachability Information L2 LSP
131 Inter-Domain Routing Protocol Information L2 LSP
132 IP Interface Address IIH, LSP
Code 1 to 10 of CLV are defined in ISO 10589 (code 3 and 5 are not shown in the table), and others
are defined in RFC 1195.
Supported IS-IS Features
Multiple instances and processes
IS-IS supports multiple instances and processes. Multiple processes allow a IS-IS process to work in
concert with a group of interfaces. This means that a router can run multiple IS-IS processes, and each
process corresponds to a unique group of interfaces.
For routers supporting VPN, each IS-IS process is associated with a VPN instance. Thus, the VPN
instance is also associated with interfaces corresponding to the process.