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Router Systems
- Jun 16, 2016 -

Router has four elements: input ports, output ports, switch, route processor and other ports. Input port is the physical link and enter the entrance of the package. Ports are usually provided by the line cards, a line card supports 4, 8 or 16 ports in General, an input port with many functions. The first function is a data link layer encapsulation and packaging. The second function is looked up in the forwarding table entry for the destination address to determine destination port (called a routing lookup), route lookup can be implemented using generic hardware, or by a microprocessor embedded in each of the line cards to complete. Thirdly, in order to improve the QoS (quality of service), the port to receive the package into several predefined service levels. Finally, ports may need to be run as SLIP (serial line Internet Protocol) or PPP (point-to-point protocol) data-link level protocols such as PPTP or (point-to-Point Tunneling Protocol) network-level protocols. Once the route lookup is complete, you must switch to send the package to the output port. If the router is an input terminal and queue, you have several inputs share the same switch. The input port of the last function is to participate in public resources (such as switch) of the arbitration agreement.

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