Protocols and standards – H3C Technologies H3C S5560 Series Switches User Manual

Page 154

Advertising
background image

138

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 12

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 1195.

Table 12 CLV codes and PDU types

CLV Code

Name

PDU Type

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

132

IP Interface Address

IIH, LSP

Protocols and standards

ISO 10589 ISO IS-IS Routing Protocol

ISO 9542 ES-IS Routing Protocol

ISO 8348/Ad2 Network Services Access Points

RFC 1195, Use of OSI IS-IS for Routing in TCP/IP and Dual Environments

RFC 2763, Dynamic Hostname Exchange Mechanism for IS-IS

Advertising
This manual is related to the following products: