HP VPN Firewall Appliances Appendix Protocol Reference

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Figure 21 L1/L2 PSNP format
CLV
The variable fields of PDU comprise multiple Code-Length-Value (CLV) triplets.
Figure 22 CLV format
Table 5 shows that different PDUs contain different CLVs. Code 1 through 10 of 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 codes and PDU types
CLV Code Name PDU T
yp
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
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