HP 6125XLG R2306-HP 6125XLG Blade Switch Layer 3 - IP Routing Configuration Gu - Page 125

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 35 CLV format Table 5 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 5 CLV codes and PDU types CLV Code 1 2 4 6 7 8 9 10 128 129 130 131 132 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 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 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 114