Comparison and Analysis of several types of protocols based on routing information protocols

The routing information protocol, that is, the RIP Protocol. This protocol is one of the earliest in the routing protocol family. It plays a fundamental role in the development of some subsequent protocols. So let's compare several protocols. The Routing Information Protocol (Routing Information Protocol) is an ancient Routing Information Protocol based on the distance vector algorithm. It selects the optimal path by calculating the minimum hop count to reach the destination ｡

The number of hops of the RIP Protocol is up to 15 hops. When the number is exceeded, the RIP Protocol considers the destination to be inaccessible, the path features cannot be fully described based on the number of hops, the selected path may not be optimal. Therefore, the RIP Protocol is only applicable to small and medium networks. RIP has become the actual standard for exchanging routing information between gateways, routers, and hosts. the IP router supports the RIP Protocol ｡

IGRP (proprietary protocol ):

Interior Gateway Protocol is a distance vector routing information Protocol developed by CISCO. Compared with RIP, IGRP combines the bandwidth, latency, reliability, and load of the network to provide a Hybrid Routing metric, this avoids problems in RIP. IGRP also has the concept of number of hops, but its maximum number of hops is 255, which can be applied to large-scale networks ｡

OSPF:

Open Shortest Path First is a link State Routing Information Protocol. Each OSRP router maintains the same network topology database. From this database, you can construct a shortest path tree to calculate the route table. the convergence speed of OSRP is faster than that of RIP, and 22. When updating route information, in order to manage large-scale networks, OSRP adopts a hierarchical connection structure. The autonomous system is divided into different regions to reduce the time for Route re-calculation ｡
 
BGP:

The Border Gateway Routing Information Protocol (Border Gateway Protocol) is a routing information Protocol between autonomous systems (, its main function is to exchange network accessibility information with other BGP systems. BGP is an external gateway routing information protocol, it can achieve non-loop exchange of routing information between autonomous systems. Based on classless Inter-Domain Routing (CIDR), BGP has been developed to support aggregation and reduction of routing information ｡

Summary

This chapter describes the basic principles of IP routing and some basic knowledge of routing information protocols. information Protocol: IGP and EGP) among them, RIP and IGRP are routing information protocols based on distance vector algorithm, while OSPF is a link status routing information protocol ｡