137
Figure 60 L1/L2 PSNP format
CLV
The variable fields of PDU comprise multiple Code-Length-Value (CLV) triplets.
Figure 61 CLV format
Table 5 shows that different PDUs contain different CLVs. 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.
Table 5 CLV name and the corresponding PDU type
CLV Code Name PDU T
e
1 Area Addresses IIH, LSP
2 IS Neighbors (LSP) LSP
4 Partition Designated Level 2 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
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
PDU length
Source ID
Variable length fields
2
ID length+1
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