Protocols And Standards - HP 6125XLG Layer 3 - Ip Routing Configuration Manual

A CSNP describes the summary of all LSPs for LSDB synchronization between neighboring routers. On
broadcast networks, CSNPs are sent by the DIS periodically (every 10 seconds by default). On
point-to-point networks, CSNPs are sent only during the first adjacency establishment.
A PSNP only contains the sequence numbers of one or multiple latest received LSPs. It can acknowledge
multiple LSPs at one time. When LSDBs are not synchronized, a PSNP is used to request missing LSPs from
a neighbor.
CLV
The variable fields of PDU comprise multiple Code-Length-Value (CLV) triplets.
Figure 38 CLV format
Table 6 shows that different PDUs contain different CLVs. Codes 1 through 10 are defined in ISO 10589
(code 3 and 5 are not shown in the table), and others are defined in RFC 1 195.
Table 6 CLV codes and PDU types
CLV Code
1
2
4
6
7
8
9
10
128
129
130
131
132

Protocols and standards

ISO 10589 ISO IS-IS Routing Protocol
•
ISO 9542 ES-IS Routing Protocol
•
ISO 8348/Ad2 Network Services Access Points
•
RFC 1 195, Use of OSI IS-IS for Routing in TCP/IP and Dual Environments
•
• RFC 2763, Dynamic Hostname Exchange Mechanism for IS-IS
Name
Area Addresses
IS Neighbors (LSP)
Partition Designated Level 2 IS
IS Neighbors (MAC Address)
IS Neighbors (SNPA Address)
Padding
LSP Entries
Authentication Information
IP Internal Reachability Information
Protocols Supported
IP External Reachability Information
Inter-Domain Routing Protocol Information
IP Interface Address
132
PDU Type
IIH, LSP
LSP
L2 LSP
LAN IIH
LAN IIH
IIH
SNP
IIH, LSP, SNP
LSP
IIH, LSP
L2 LSP
L2 LSP
IIH, LSP