Basic knowledge about Dynamic Routing Protocols

The use of routing protocols plays an incomparable important role in network operation. We know that it is divided into many small types. Today, we will introduce the dynamic routing protocol. Dynamic Routing Protocol is the main method used by routers in network layer forwarding groups. The network is a very complex system, and many technologies exist together, at the same time, each technology follows a protocol. Dynamic Routing Protocol plays an important role in network communication. The interconnection network uses routing to send data from one network to another ｡

In computer networks, the network ing between Online mobile groups and data transmission is completed dynamically using algorithms and protocols. These algorithms and protocols are what we call the Dynamic Routing Protocol (Dynamic Routing Protocol ), dynamic Routing Protocol is the main method used by routers to forward packets at the network layer. Another way to forward packets between networks is Static Routing Protocol. The Administrator manually adds routes to the routing table, several dynamic routing protocols are discussed here ｡

Computer networks is a complex system with many technologies, in addition, each technology plays an irreplaceable role like other technologies. Many international organizations and companies have independently set network standards, and they are not fully compatible with each other. Many enterprises have also launched a variety of products, network services and network protocols using unconventional network technologies. computer networks are becoming more and more complex, the reason for the complexity is that there are multiple network technologies and various network protocols used to connect two or more networks, which leads to multiple possible connection methods between networks. For example, CISCO routers have self-developed dynamic routing protocols IGRP and VPN. When PACKET forwarding is performed on the three layers of the WAN, the destination router must be a CISCO router and use the IGRP or OSPF dynamic routing protocol. Otherwise, the router cannot communicate with the destination host, because IGRP and OSPF are CISCO proprietary routing protocols ｡

Routing Protocols: a protocol used to establish and maintain a route table and forward data packets based on the Optimal Path to the Data Packet Destination. For example, r12001, IGRP, OSPF and so on. Routed protocols: the selected routing protocol is used by the final node to encapsulate the data and network layer address allocation information in the data packet, the purpose is that it can relay through the interconnection network. Both AppleTalk, IP, and IPX have selected dynamic routing protocols. Note: When a protocol does not support network layer addresses, then it is not a routing protocol ｡

The router uses the routing protocol (routing protocols ), in order to establish and maintain the route table and forward data packets according to the optimal path to the Data Packet Destination, the router can understand the status of the network that is not directly connected and communicate with other routers, to understand the network they are concerned about. This communication continues, so that the information in the route selection table can be updated at any time when the interconnect network changes ｡

The vector router regularly sends their entire routing table (routing table) to neighboring routers) the routing information table is created based on the information received from the neighboring router. No matter what type of routing algorithm is used, all routers on the interconnect network need time to update the changes in their route selection table. This process is called convergence) link Status routing protocol is used to map the topology of the interconnect network. It is a routing protocol that is more complex than distance vector, at present, the most popular dynamic routing protocol is a link state protocol: OSPF. The popularity of OSPF is more popular because of the emergence of Multi-Protocol Label Switching (MPLS ｡

The link status Router does not broadcast all information contained in their route tables. The link status Router Protocol only sends information about the changed routes. The link status router sends a call message to their neighbors., this is called the link state notice (LSA). Then, the neighbor copies the LSA to their routing selection table and transmits the information to the remaining part of the network. This process is called flooding) the link status dynamic routing protocol uses a method called cost (cost) instead of hop. The cost is automatically assigned or manually assigned ?? It is impossible to select a loop. There are 2nd advantages. aggregation in the Link State interconnection network is very fast. These advantages release the resources of the router, because the processing capability and bandwidth consumption for poor routing information are very small ｡