(Introduction: the 50 key points of router knowledge that network engineers should master are not only the knowledge of network engineers, but also the knowledge that network administrators must master. The excerpts are as follows: 1. When to use multi routing protocol? When two different routing protocols want to exchange routing information, multi routing protocol is used. Of course, route reallocation can also exchange route information. There is no need to use multi routing protocol in the following cases: upgrade from the old version of interiorgatewayprotocol (IGP) to the new version of IGP. You want to use another routing protocol, but you must keep the original protocol. You want to terminate the internal route to avoid interference with other routers that do not have strict filtering and supervision functions. You are in an environment composed of routers from multiple manufacturers. 2. What is distance vector routing protocol? Distance vector routing protocol is designed for small network environment. In large-scale network environment, such protocols will generate large traffic and occupy too much bandwidth when learning and maintaining routing. If the routing table update sent by the adjacent site is not received within 90 seconds, it will consider the adjacent site unreachable. Every 30 seconds, the distance vector routing protocol will send the entire routing table to the adjacent sites, so that the routing table of the adjacent sites can be updated. In this way, it can collect a list of networks from other sites (directly connected or otherwise connected) for routing. Distance vector routing protocol uses hops as a measure to calculate the number of routers to reach the destination. For example, rip uses Bellman Ford algorithm to determine the shortest path, that is, the line that can reach the destination as long as it passes through the minimum number of hops. The maximum number of hops allowed is usually set at 15. Terminals that must pass through more than 15 routers are considered unreachable. There are several distance vector routing protocols: iprip, ipxrip, appletalkrtmp and IGRP. Network engineers should master 50 key points of router knowledge doc)
收藏
