Introduction to Routing Protocol

The routing protocol can be divided into Static Routing and dynamic routing. Static Routing: it is a fixed route information manually set by the Administrator in the router. Static Routing cannot reflect network changes. It is generally used in a network with a small scale and a fixed topology, the advantage is that the configuration is simple and efficient. Among all routes, the static route has the highest priority. When a dynamic route conflicts with a static route, the static route prevails. Dynamic Routing: Communication Between routers in the network transmits route information, and uses the received route information to update the route table. It can adapt to changes in the network structure in real time. It is mainly used for large-scale networks with complex topology structures. Static Routing and dynamic routing configuration, We will write a detailed description later, this article mainly discusses some theoretical content. Dynamic Routing Protocol Introduction: Dynamic Routing depends on the routing protocol to collect and disseminate information. The routing protocol is used to learn and maintain route tables. It obtains route update packets from other participants on the network. The dynamic routing protocol can be divided into the following two categories based on the operating region: 1. IGP (Internal Gateway Protocol): Used to exchange routing information within the autonomous system. RIP, IGRP, OSPF, all belong to IGP. Www.2cto.com 2, EGP (external Gateway Protocol): Used to exchange routing information between different Autonomous Systems. BGP (Border Gateway Protocol) belongs to EGP. The concept of distance management: Multiple Dynamic Routing Protocols and Static Routing can be used at the same time. If multiple routing protocols reach the same network, learn routing information, we need to use the Management Distance to evaluate the reliability of each route information. The Management Distance can distinguish the advantages and disadvantages of route information learned from different routing protocols on the same network. If multiple routes exist in the same network and different protocols are run, the management distance is compared. The smaller the management distance, the higher the priority, it is regarded as the best path (route) into the routing table. Default Management Distance of various routing protocols: (Note: The values in the brackets indicate the default Management Distance) direct connection interface (0), Static Routing (1), and VPN (90). It is a hybrid protocol, is a Cisco proprietary protocol. Also known as "enhanced internal gateway protocol" IGRP (100); this protocol has eliminated OSPF (110), RIP (120), and unknown/untrusted (255) routing Protocol Introduction: In autonomous systems, most IGP routing protocols can be divided into the following types based on different calculation methods: 1. Distance Vector: distance vector algorithm, determine the direction (vector) and distance of any node in the network, including RIP and IGRP. 2. Link Status: algorithm of link status. Calculate the correct topology of the network (or part of the Network) generated by the router, including OSPF and IS-IS. (Protocol No.: 89) 3. hybrid algorithms: the hybrid algorithms integrate some aspects of distance vectors and link state algorithms, including. (Protocol No.: 88) www.2cto.com is often used by routers to calculate the measurement value parameters: (according to different algorithms, the involved parameters are also different) 1. Number of hops (RIP ); 2. Timing point; 3. overhead; 4. bandwidth; 5. latency; 6. Load; 7. reliability; 8. MTU (maximum transmission unit) from Sanyou Network Technology Studio