Industrial 4g routers use CSNP to ensure the integrity of the li

In broadcast networks, industrial routers use CSNP to ensure the integrity of the link state database, and only DIS will send CSNP messages for industrial full Netcom routers, and the interval between DIS sending CSNP messages is 10s. The CSNP packet describes the summary information of all industrial-grade 3G router LSPs in the link state database of the DIS. When other industrial routers receive the CSNP sent by the DIS, they compare the LSP summary information in the CSNP with the LSP in the local link state database. The purpose of the comparison is to determine whether the information in the local link state database Already synchronized and complete. If an industrial 4g router finds a missing LSP entry in the local database, it will use PSNP to request the missing LSP entry from the DIS. This PSNP message contains the summary information of the requested LSP entry. When the DIS receives PSNP packets from other routers in the entire network, it will send a complete LSP packet. This LSP is the LSP entry missing from other industrial wireless routers. In a broadcast network, the DIS sends periodic link state database signals to the network using periodic CSNP messages, while other industrial 4g routers use PSNP messages to request missing LSP entries.

In an IS-IS point-to-point type network, the operation of link state database synchronization is slightly different from that in a broadcast network, and the industrial-grade full Netcom routers send CSNP and PSNP messages and their functions have some differences.