描述

DS200TCPDG2BEC 根據(jù)幀頭的目的MAC地址查找MAC地址表

以太網(wǎng)交換機(jī)是基于以太網(wǎng)傳輸數(shù)據(jù)的交換機(jī)，DS200TCPDG2BEC采用共享總線型傳輸媒體方式的局域網(wǎng)。以太網(wǎng)交換機(jī)的每個(gè)端口都可以直接與主機(jī)相連，并且一般以全雙工模式工作。以太網(wǎng)交換機(jī)結(jié)構(gòu)是每個(gè)端口都直接與主機(jī)相連，并且一般以全雙工模式工作。交換機(jī)能同時(shí)連通許多對(duì)的端口，使每一對(duì)相互通信的主機(jī)都能像獨(dú)占通信媒體那樣進(jìn)行無沖突地傳輸數(shù)據(jù)。

以太網(wǎng)交換機(jī)是一種基于MAC地址識(shí)別、完成以太網(wǎng)數(shù)據(jù)幀轉(zhuǎn)發(fā)的網(wǎng)絡(luò)設(shè)備。其工作原理是交換機(jī)在端口上接受計(jì)算機(jī)發(fā)送過來的數(shù)據(jù)幀，根據(jù)幀頭的目的MAC地址查找MAC地址表，然后將該數(shù)據(jù)幀從對(duì)應(yīng)端口上轉(zhuǎn)發(fā)出去，從而實(shí)現(xiàn)數(shù)據(jù)交換。此外，以太網(wǎng)交換機(jī)應(yīng)用最為普遍，價(jià)格也較便宜，檔次齊全，因此其應(yīng)用領(lǐng)域非常廣泛。

DS200TCPDG2BEC 以太網(wǎng)交換機(jī)通過以下步驟進(jìn)行數(shù)據(jù)交換：

直通方式：以太網(wǎng)交換機(jī)在各端口間建立縱橫交叉的線路矩陣，在輸入端口檢測(cè)到一個(gè)數(shù)據(jù)包時(shí)，檢查該包的包頭，獲取包的目的地址，啟動(dòng)內(nèi)部的動(dòng)態(tài)查找表轉(zhuǎn)換成相應(yīng)的輸出端口，在輸入與輸出交叉處接通，把數(shù)據(jù)包直通到相應(yīng)的端口，實(shí)現(xiàn)交換功能。由于不需要存儲(chǔ)，延遲非常小、交換非?？欤@是它的優(yōu)點(diǎn)。但它的缺點(diǎn)是，因?yàn)閿?shù)據(jù)包內(nèi)容并沒有被以太網(wǎng)交換機(jī)保存下來，所以無法檢查所傳送的數(shù)據(jù)包是否有誤，不能提供錯(cuò)誤檢測(cè)能力。由于沒有緩存，不能將具有不同速率的輸入/輸出端口直接接通，而且容易丟包。

存儲(chǔ)轉(zhuǎn)發(fā)方式：存儲(chǔ)轉(zhuǎn)發(fā)方式是計(jì)算機(jī)網(wǎng)絡(luò)領(lǐng)域應(yīng)用最為廣泛的方式。以太網(wǎng)交換機(jī)把輸入端口的數(shù)據(jù)包先存儲(chǔ)起來，然后進(jìn)行CRC(循環(huán)冗余碼校驗(yàn))檢查，在對(duì)錯(cuò)誤包處理后才取出數(shù)據(jù)包的目的地址，通過查找表轉(zhuǎn)換成輸出端口送出包。這種方式可以對(duì)傳輸錯(cuò)誤的數(shù)據(jù)包進(jìn)行檢查，但需要較長(zhǎng)的時(shí)延。

DS200TCPDG2BEC 根據(jù)幀頭的目的MAC地址查找MAC地址表

Ethernet switch is a switch based on Ethernet to transmit data. DS200TCPDG2BEC is a LAN with shared bus transmission media. Each port on an Ethernet switch can be directly connected to a host and generally works in full duplex mode. The Ethernet switch structure is that each port is directly connected to the host, and generally works in full duplex mode. The switch can connect many pairs of ports at the same time, so that each pair of hosts communicating with each other can transmit data without conflict as if they were exclusive communication media.

Ethernet switch is a network device that realizes Ethernet frame forwarding based on MAC address recognition. The working principle is that the switch accepts the data frame sent by the computer on the port, finds the MAC address table according to the destination MAC address of the frame header, and then forwards the data frame from the corresponding port to achieve data exchange. In addition, the Ethernet switch is the most common application, the price is also cheaper, the grade is complete, so its application field is very wide.

The DS200TCPDG2BEC Ethernet switch uses the following steps to exchange data:

Through mode: The Ethernet switch establishes a crosswise line matrix between ports. When a packet is detected on the input port, the switch checks the packet header, obtains the destination address of the packet, and starts the internal dynamic lookup table to convert the packet to the corresponding output port. When the input and output are connected at the intersection, the packet is passed through to the corresponding port to realize the switching function. Since no storage is required, the latency is very small and the exchange is very fast, which is its advantage. However, its disadvantage is that because the packet content is not saved by the Ethernet switch, it cannot check whether the transmitted packet is wrong, and it cannot provide error detection capability. Since there is no cache, input/output ports with different rates cannot be directly connected, and it is easy to lose packets.

Store-and-forward mode: store-and-forward mode is the most widely used mode in the field of computer network. The Ethernet switch stores the data packets at the input port first, then performs CRC(cyclic redundancy code check) check, and takes out the destination address of the data packet after processing the error packet, and converts the data packets to the output port through the lookup table. In this way, incorrect packets can be checked, but the delay is long.

 

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