Five Key Aspects to Categorize Routers

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Router Classification: Products can be categorized into various types based on different criteria. Here are the common router classifications:

Router Classification 1: High-end, Mid-range, and Low-end Routers by Performance Tier

Routers with a throughput greater than 40Gbps are typically classified as high-end routers. Those with throughput between 25Gbps and 40Gbps are considered mid-range routers, while those below 25Gbps are regarded as low-end routers. This is, of course, a macro-level classification standard, and divisions may not be entirely consistent across manufacturers. In practice, router tiers are determined by a composite index, not just throughput. Taking Cisco, which holds the largest market share, as an example: the 12000 series is a high-end router, while the 7500 series and below are considered mid-range to low-end routers.

Router Classification 2: Modular Routers and Non-Modular Routers by Structure

Modular structures allow for flexible router configuration to meet the growing business needs of an enterprise, whereas non-modular routers only offer fixed ports. Typically, mid-range to high-end routers feature a modular structure, while low-end routers are non-modular.

Router Classification 3: Core Routers, Enterprise Routers, and Access Routers by Function

Core routers are key devices for achieving enterprise-level network interconnection. They handle very large data throughput and are critically important. The fundamental performance requirements for core routers are high speed and high reliability. To achieve high reliability, network systems commonly employ traditional redundancy techniques such as hot backup, dual power supplies, and dual data paths, making router reliability generally a non-issue.

Enterprise routers connect many terminal systems. They have many connection points, but the systems are relatively simple and data traffic is lower. The requirement for these routers is to achieve as many endpoint interconnections as possible in the most cost-effective way, while also supporting different qualities of service. Access routers are primarily used to connect home users or small business customer groups within an ISP.

Router Classification 4: Edge Routers and Intermediate Node Routers by Network Position

Clearly, edge routers are located at the network periphery and are used to connect different network routers. Intermediate node routers, on the other hand, sit in the middle of the network and are typically used to connect different networks, acting as a bridge for data forwarding. Due to their differing network environments, their primary performance characteristics have corresponding emphases. For instance, intermediate node routers must face a wide variety of networks.

How do we identify the various nodes within these networks? It relies on the MAC address memory function of these intermediate node routers. For this reason, when selecting an intermediate node router, greater attention should be paid to its MAC address memory function, meaning choosing a router with a larger cache and stronger MAC address memorization capability. However, an edge router may need to simultaneously accept data from many different network routers, so it requires a sufficiently wide backplane bandwidth. This, of course, also depends on the network environment where the edge router is situated.

Router Classification 5: Line-Speed Routers and Non-Line-Speed Routers by Performance Capability

A so-called line-speed router is one that can transmit smoothly at the full bandwidth of the transmission medium, essentially without interruption or delay. Typically, line-speed routers are high-end routers with very high port bandwidth and data forwarding capabilities, able to forward data packets at media speed. Mid-range and low-end routers are non-line-speed routers. However, some new broadband access routers also have line-speed forwarding capabilities.

These five aspects classify routers from different angles, aiming to provide a more detailed understanding of router classification and a deeper insight into routers.

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