Tell you do not know about the standard technology of the router - the router-IT industry
Because of the current continuous progress of information society, people have increasing demand for data communication. Since the TCP / IP protocol family seven mid launch, has become Network The de facto standard communication protocol layer based on TCP / IP, the Internet has become the largest and most important network. Router As the core of IP network devices have been widely used ever.
Router IP network as the core equipment, the technology has become the key technology of information industry, the equipment itself in the data communications play an increasingly important role. At the same time as powerful router equipment, and technical complexity, the manufacturers of the router to achieve too much selectivity. Router as the core of the public network equipment, it is necessary to raise the minimum equipment standards requirements. Therefore, to standardize on the router device has its importance and necessity. On the standard router device has been released as follows: YD/T1156-2001 "router test specification - high-end router"; YD/T1098-2001 "router test specification - low-end routers."
Router definitions Router is working in the third layer of OSI reference model?? Network layer packet forwarding device. Routers forward packets to achieve the interconnection. Although the router can support multiple protocols (eg TCP / IP, IPX / SPX, AppleTalk and other agreements), but the vast majority of routers in our running TCP / IP protocol. Routers usually connect two or more IP subnets or point to point agreement by the identity of the logical port, at least one physical port. Routers receive packets according to the network layer address and the router to maintain routing tables within the decision output and the next hop address, and rewrite the data link layer header forwarding packets. Routers routing tables to reflect the dynamic maintenance of the current network topology, and other routers with the network to exchange routing and link information to maintain routing table.
Router Categories Current classification of different routers, various classifications have some relevance, but not entirely consistent. From the structural points, routers can be divided into modular structure and non-modular structure, usually in the high-end routers for the modular structure, low-end router for non-modular structure.
Location from the network division of the router can be divided into core routers and access routers. Core routers in the network center, high-end routers typically require fast packet switching capabilities and high-speed network interface, usually modular structure; access routers in the network edge, typically used in low-end routers, the port and required relatively low strong access control.
From the functional division of the router can be divided into general-purpose routers and dedicated routers. General, generic router to router. Dedicated routers usually achieve a particular function on the router interface, such as specialized hardware optimization, such as access routers for access dial-up users, PSTN interface and enhanced signaling capacity; VPN router processing capacity and enhanced hardware encryption tunnel; broadband access into the router, broadband interface number and types of stress.
Points from the performance, wire-speed routers, and routers can be divided into non-wire-speed routers. Wire-speed routers are usually high-end routers, can forward packets media rate; in the low-end routers, wire-speed non-routers, but the number of new broadband access router also has wire-speed forwarding capability.
In the development of standards, the router can be divided from the ability to distinguish between: the high-end routers and low-end routers and other types of backplane switching capacity of more than 20Gbit / s, packet switching capacity of more than 20Mbit / s router called high-end router; packet switching capacity of less than 1Mbit / s low-end router as a router. The largest market share of Cisco's case, high-end 12000 series routers, 7500 series routers for the low-end routers, the following. Obvious gap in the division: packet switching capacity of 1Mbit / s over 20Mbit / s router does not refer to the following standards. In accordance with the standard series, should be mid-range router specification. However, because there is no special mid-range routers, can refer to low-end routers or high-end router, so no separate separate standards.
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