The ethernet router principle router (Router) is uses in connecting in many logic the separated network, the so-called logical network is represents an independent network or a subnet. When the data transmits from a subnet to another subnet, may complete through the router. Therefore, the Ethernet router has the judgment network address and the choice way function, it can in the multi-network interconnection environment, establish the nimble connection, the available completely different data grouping and the medium access method connect each kind of subnet, the router only accept the source to stand or other router information, is the network level one kind of interconnection equipment. It does not care about various subnets use the hardware equipment, but request movement with network level agreement consistent software. The router divides the local router and the long-distance router, the local router is uses for the linked network transmission medium, like optical fiber, coaxial cable, twisted pair line; The long-distance router is uses for to connect the long-distance transmission medium, and requests the corresponding equipment, like the telephone line must match the modem, wireless must pass the wireless receiver, the transmitter. the its principle of work is as follows: (1) workstation A workstation B address 120.0.5 together with data message by data frame form transmission for router 1. (after 2) the router 1 receives workstation The data frame, takes out address 120.0.5 first from the masthead, and figures out according to the way instrument sends out workstation B the optimal path: R1->R2->R5->B; And data frame sending-out router 2. (3) the router 2 redundant router 1 work, and gives the data frame repeater the router 5. (4) the router 5 take out the destination address similarly, discovered 120.0.5 in this router connects in webpage, therefore gives directly this data frame workstation B. (5) workstation B receives workstation The data frame, a course of communications announced ends. in fact, router besides above routing this major function, but also has the network flow control function. Some routers only support the sole agreement, but the majority of routers may support many kinds of agreements the transmissions, namely multi-agreement router. Because each kind of agreement has own rule, must complete many kinds of agreements in a router the algorithms, will reduce the router inevitably the performance. Therefore, we thought that supports the multi-agreements the router performance to be relatively low. When user purchase router, needs according to own actual situation, to choose oneself need the network protocol router. presented the exchange router product in recent years, in essence it is not the new technology, but to sharpen the traffic capacity, combines in the router switchboard's principle, causes the data transmission ability to be quicker, to be better.

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