Basic knowledge of Vector Routing Protocol

Vector routing protocols are still commonly used. So I have studied the basic knowledge of vector routing protocols. Here I will share with you, hoping to help you. When two different routing protocols need to exchange routing information, they need to use multiple routing protocols. Of course, route redistribution can also exchange route information.

In the following cases, you do not need to use the multi-route Protocol: upgrade from the old version of the Internal Gateway Protocol Interior Gateway Protocol, I G P) to the new version of IGP. To use another routing protocol, you must retain the original one. You want to terminate the internal route to avoid interference from other routers that do not strictly filter the monitoring function. You are in an environment composed of routers from multiple manufacturers. What is distance vector routing protocol? The distance vector routing protocol is designed for small network environments. In a large network environment, such protocols will generate large traffic when learning routes and maintaining routes, occupying excessive bandwidth.

If the route selection table update is not received from the adjacent site within 90 seconds, the adjacent site is considered inaccessible. Every 30 seconds, the distance vector routing protocol sends the entire route selection table to the adjacent site to update the route selection table of the adjacent site.

In this way, it can be directly connected from other sites or other methods) to collect a list of networks for route selection. Distance Vector Routing uses the number of hops as the metric value to calculate the number of routers that need to pass to the destination. The algorithm determines the shortest path, that is, the line that can reach the destination as long as it passes through the smallest hop count. The maximum number of hops allowed is usually set to 1 5. terminals that must pass through more than 5 vrouters are considered inaccessible. Distance Vector routing protocols include ip rip, ipx rip, Apple Talk rt mp, and IGRP.

What is the link status routing protocol?

The connection status routing protocol is more suitable for large networks. However, due to its complexity, the router needs more CPU resources. It can detect broken links or new routers in a shorter period of time, so that the convergence time of the Protocol is shorter than that of the Distance Vector routing protocol. Generally, if a neighboring station's he l lo packet is not received within 10 seconds, it is deemed that the neighboring station is no longer reachable. A connection status router sends an update message to its neighbor to notify it of all the links it knows. It determines that the measurement value of the optimal path is a numerical cost, which is generally determined by the bandwidth of the link. Links with the minimum cost are considered optimal.

In the Shortest Path priority algorithm, the maximum possible cost is almost unlimited. If the network does not change, as long as the router periodically refreshes the route selection table that has not been updated, the duration of the cycle can be from 3 0 minutes to 2 hours ). There are several connection status routing protocols: ip ospf, ipx nlsp, and IS-IS. Can a router use the distance vector routing protocol and the link status routing protocol? Yes. Each interface can be configured to use different routing protocols. However, they must be able to exchange routing information by allocating routes.

What is an access table?

The access table is a series of rules that the manager adds to control data packets input and output in the vro. It is not generated by the router itself. The Access Table allows or disables data packets from entering or outputting to the destination. The table items for accessing the table are executed sequentially. When the data packet arrives, the system first checks whether it is restricted by the first table item. If not, it is executed sequentially; if it matches the first table item, you do not have to perform the following table item check whether it is allowed or disabled. Each Protocol of each interface can have only one access table. What types of access tables are supported? The number of an access table can be determined.