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Anonymous users2024-02-061. RIP protocol - routing information protocol, which belongs to the earliest dynamic routing protocol advantages: cost saving, low resource consumption, simple configuration, low hardware requirements, low CPU occupation and memory, so it is still used in small networks. Cons:
The computing route is slow, the link changes and the convergence is slow, the routing table that can be saved is relatively small, and it can only support the network of 15 devices at most, which is only suitable for small networks 2, OSPF protocol - open shortest path priority protocol, the main protocol used by the enterprise network Advantages: the technology is mature, the problems encountered can basically be found in the data, the convergence is fast, due to Cisco's push, there are many people who will use itDisadvantages: convergence speed, security is worse than ISIS3, ISIS Protocol - Intermediate System to Intermediate System Protocol, Transport Network Advantages of the protocol mainly used by the operator's network:
The algorithm is similar to OSPF, with fast convergence and high security: the exception processing data is not as rich as OSPF 4, BGP protocol-border gateway protocol, the transmission of routes used for the core network does not matter the advantages and disadvantages, because it does not overlap with others, a simple application, such as BGP can be used for the mutual transmission of routes between Netcom and Telecom, if other IGPs (OSPF or ISIS) are used, the routes cannot be calculated due to the number of routes, or the route calculation is very slow, which can support the calculation and delivery of million-level routes, which has high requirements for equipment and large resource occupation.
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Anonymous users2024-02-05RIP distance vector protocol OSPF and ISIS link state protocol BGP barely count a distance vector protocol Cisco's private IGRP and EIGRP are not to be mentioned.
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Anonymous users2024-02-04Dynamic routing protocols have been used in networks since the early eighties of the last century. The first version of the RIP protocol was introduced in 1982, but some of the basic algorithms were applied to ARPANET as early as 1969. With the continuous development of network technology, the dust of the network has become more and more complex, and new routing protocols are constantly emerging.
Recognize Dynamic Routing Protocols:
What is a dynamic routing protocol: A routing protocol is a protocol used to exchange routing information between routers. With the routing protocol, routers can dynamically share information about remote networks, and the routing protocol can determine the best path to each network and then add the path to the routing table.
The main benefit of the dynamic routing protocol is that whenever the network topology changes, the routers will exchange routing information with each other, not only automatically knowing the newly added network, but also finding an alternate path if the current network connection fails.
Network discovery and routing table maintenance:
The purpose of the dynamic routing protocol is to exchange routing information and add the best path it selects to the routing table. The purpose of the routing protocol is as follows:
Discover remote networks.
Maintain up-to-date routing information.
Select the best path to the destination network.
Find the best new path when the current path is unavailable.
What are the parts of the routing protocol:
Data structure - Some routing protocols use routing tables and or databases to complete the routing process. This information is kept in memory.
Algorithm - An algorithm refers to a certain number of steps used to complete a task. Routing protocols use algorithms to route information and determine the best path.
Routing Protocol Messages - Routing protocols use a variety of messages to locate nearby routers, exchange routing information, and perform other tasks to obtain and maintain accurate network information.
The dynamic routing protocol works as follows:
The operation process of a dynamic routing protocol is determined by the type of routing protocol and the protocol itself).
The router sends and receives routing messages through its interface.
Routers share routing messages and routing information with other routers that use the same routing protocol.
Routers learn about remote networks by exchanging routing information.
If a router detects a change in the network topology, the routing protocol can inform other routers of the change.
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Anonymous users2024-02-03Common dynamic routing protocols for posture tremor include RIP, OSPF, IS-IS, IGRP, EIGRP, and BGP. RIP, OSPF, IS-IS, IGRP, EIGRP are internal gateway protocols (IGPs), which are suitable for the operation of a single ISP's unified routing protocol. BGP is a routing protocol between autonomous systems, an external gateway protocol, mostly used on the Internet, to exchange routing information between different operators, and sometimes used in the internal network of some large enterprises.
The following describes the characteristics of various routing protocols.
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Anonymous users2024-02-02RIP distance vector protocol OSPF and ISIS link state protocol BGP barely count a distance vector protocol Cisco's private IGRP and EIGRP are not to be mentioned.
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Anonymous users2024-02-01Advantages of Static Routes:
l Consumes less CPU processing time.
l It is convenient for administrators to understand routes.
l Easy to configure.
Disadvantages of Static Routes:
l Time-consuming configuration and maintenance.
l Configuration is error-prone, especially for large networks.
● The administrator is required to maintain the changed routing information.
l Cannot be scaled with the growth of the network; Maintenance will become more and more cumbersome.
l You need to have a complete understanding of the situation of the entire network in order to operate.
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Anonymous users2024-01-31Dynamic routing protocols are categorized as follows:
1. The dynamic routing protocol is divided into internal gateway protocol (IGP) connection state; The link-state routing protocol, also known as the shortest path first protocol, is based on the Shortest Path First (SPF) algorithm of Edsger Dijkstra. It is much more complex than the distance vector routing protocol, but the basic functions and configuration are simple, and even the algorithm is easy to understand. The information about the link state of the router is called the link state and includes:
The IP address and subnet mask of the interface, the type of network (such as an Ethernet link or a serial point-to-point link), the cost of the link, and all neighboring routers on the link.
distance vector; The origin of the name of the distance vector is that the route is advertised in the form of a vector (distance, direction), where the distance is determined by the metric. In layman's terms, this is the distance in a certain direction.
Hybrid hybrid
2. And External Gateway Protocol (EGP) The External Gateway Protocol is a now-obsolete Internet routing protocol that was originally proposed in 1982 by BBN Technologies. It was first described in RFC827 and formalized in RFC904 in 1984. EGP is a simple (network) reachability protocol that, unlike modern distance-vector protocols and path-vector protocols, is limited to networks that are suitable for tree topologies.
Typical BGP
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Anonymous users2024-01-30Dynamic routing protocols are divided into Interior Gateway Protocol (IGP) and External Gateway Protocol (EGP).
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Anonymous users2024-01-291. Dynamic routing protocols are divided into internal gateway protocols (IGPs).
Link state
distance vector;
Hybrid hybrid
2 and External Gateway Protocol (EGP).
Typical BGP
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Anonymous users2024-01-281. RIP protocol-routing information protocol is the earliest dynamic routing protocol with advantages: cost-saving, low resource consumption, simple configuration, low hardware requirements, low CPU and memory occupation, so it is still used in small networks. Cons:
The computing route is slow, the convergence is slow due to link changes, and the routing table that can be saved is relatively small, and can only support a network of 15 devices at most, which is only suitable for small networks.
2. OSPF protocol - open shortest path priority protocol, the main use of enterprise network Advantages: mature technology, problems can basically be found in the data, fast convergence, due to Cisco's strong push, will use more people Disadvantages: convergence speed, security is worse than ISIS.
3. ISIS protocol - intermediate system to intermediate system protocol, transport network The main protocol used by the operator network is advantageous: the algorithm is similar to OSPF, the convergence is fast, and the security is highDisadvantages: the exception processing data is not as rich as OSPF.
4. BGP protocol-border gateway protocol, the transmission of routes used for the core network does not matter the advantages and disadvantages, because it does not overlap with others, a simple application, such as BGP can be used for the mutual transmission of routes between Netcom and Telecom, if you use other IGPs (OSPF or ISIS), it will be impossible to calculate the route due to the number of routes, or the route calculation is very slow, the big finger can support the calculation and delivery of millions of routes, and the equipment requirements are higher. It occupies a large amount of resources.
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