The most important type of router protocol

For routers this important network product, has the study about it is always endless headless. So what is the rationale behind this router? Is what we usually call a class routing protocol. Let's summarize what router protocols are available here, before we get to the premise of using this protocol. When does the

1 use the multi-router protocol? When two different routing protocols want to exchange routing information, a multiple router protocol is used. Of course, routing reallocation can also exchange routing information? The following situations do not need to use the multiple routing protocol: from the old version of the Internal Gateway Protocol ( INTERIORGATEWAYPROTOCOL,IGP) upgrade to a new version of IGP?

Do you want to use another router protocol but you have to keep the original protocol? Do you want to terminate the internal routing to avoid interference from other routers that do not have strict filtering capabilities? You are in an environment made up of routers of multiple factories?

2 What is the distance vector router protocol? is the distance vector router protocol designed for small network environments? In a large network environment, such protocols in the learning route and maintain the route will generate large traffic, excessive bandwidth consumption? If you do not receive a routing table update sent by an adjacent site within 90 seconds, Does it think neighboring sites are unreachable? Every 30 seconds, the distance vector router protocol is going to send an entire routing table to neighboring sites to update the routing table of adjacent sites. In this way, it can collect a list of networks from other sites (directly connected or otherwise connected) for routing? The distance vector router protocol uses the hop count as a measure to calculate the number of routers to go through at the destination.

For example, RIP uses the Bellman-ford algorithm to determine the shortest path, that is, a line that reaches its destination as long as the smallest number of hops is reached. The maximum allowable number of hops is usually set at 15? are terminals that must pass over 15 routers considered unreachable? Distance Vector Router protocol has the following several: IPRIP? Ipxrip? Appletalkrtmp and IGRP?

3 What is a link state router protocol? The link state router protocol is better suited for large networks, but because of its complexity, routers require more CPU resources. It can find a broken link or a newly connected router in less time. So that the convergence time of the protocol is shorter than the distance vector router protocol? Normally, in 10 seconds without receiving a Hello message from the adjacent station, does it assume that the adjacent station is unreachable? A link state router sends an update message to its neighboring station informing it of all links it knows? It determines the optimal path of the measure is a numerical cost, The value of this price is generally determined by the bandwidth of the link. is the link with the lowest cost considered optimal? In the shortest Path first algorithm, the maximum possible cost value can be almostTo be infinite?

If there are no changes to the network, routers can periodically refresh the routing table without updates (the length of the cycle can be from 30 minutes to 2 hours). Link state router protocols are as follows: IPOSPF? IPXNLSP and Is-is? Can a router use both the distance vector router protocol and the link state router protocol? Can you? Each interface can be configured to use a different router protocol, but they must be able to exchange routing information by reallocating the route?

4 什么是访问表?访问表是管理者加入的一系列控制数据包在路由器中输入?输出的规则?它不是由路由器自己产生的?访问表能够允许或禁止数据包进入或输出到目的地?访问表的表项是顺序执行的,即数据包到来时, First of all, whether it is bound by the first table, if not, in order to execute downward, if it matches the first table entry, whether it is allowed or prohibited, do not have to perform the following table entry check?

5 When do I use routing reassignment? Route reallocation is typically configured on routers that are responsible for learning routes from one autonomous system and then broadcasting to another autonomous system? If you are using IGRP or EIGRP, routing reallocation is usually performed automatically?

6 What is the management distance? Management distance refers to the routing reliability of a router protocol. Each router protocol assigns a trust level from highest to lowest reliability, which is called the management distance? For two different router protocols to a destination routing information, Which protocol does the router first decide to trust based on the management distance?