1769-L30ER-NSE產(chǎn)品說明
1769-L30ER-NSE 經(jīng)過該網(wǎng)絡(luò)中的機器不斷地通信，交換機最終將MAC地址表建立完畢~
隨著機器數(shù)量越多，交換機的端口也不夠了，但聰明的你發(fā)現(xiàn)，只要將多個交換機連接起來，這個問題就輕而易舉搞定~
你完全不需要設(shè)計額外的東西，只需要按照之前的設(shè)計和規(guī)矩來，按照上述的接線方式即可完成所有電腦的互聯(lián)，所以交換機設(shè)計的這種規(guī)則，真的很巧妙。你想想看為什么（比如A要發(fā)數(shù)據(jù)給F）。
但是你要注意，上面那根紅色的線，最終在MAC地址表中可不是一條記錄呀，而是要把EFGH這四臺機器與該端口（端口6）的映射全部記錄在表中。
最終，兩個交換機將分別記錄A~H所有機器的映射記錄。
左邊的交換機
|
MAC地址
|
端口
|
|
bb-bb-bb-bb-bb-bb
|
1
|
|
cc-cc-cc-cc-cc-cc
|
3
|
|
aa-aa-aa-aa-aa-aa
|
4
|
|
dd-dd-dd-dd-dd-dd
|
5
|
|
ee-ee-ee-ee-ee-ee
|
6
|
|
ff-ff-ff-ff-ff-ff
|
6
|
|
gg-gg-gg-gg-gg-gg
|
6
|
|
hh-hh-hh-hh-hh-hh
|
6
|
右邊的交換機
|
MAC地址
|
端口
|
|
bb-bb-bb-bb-bb-bb
|
1
|
|
cc-cc-cc-cc-cc-cc
|
1
|
|
aa-aa-aa-aa-aa-aa
|
1
|
|
dd-dd-dd-dd-dd-dd
|
1
|
|
ee-ee-ee-ee-ee-ee
|
2
|
|
ff-ff-ff-ff-ff-ff
|
3
|
|
gg-gg-gg-gg-gg-gg
|
4
|
|
hh-hh-hh-hh-hh-hh
|
6
|
這在只有8臺電腦的時候還好，甚至在只有幾百臺電腦的時候，都還好，所以這種交換機的設(shè)計方式，已經(jīng)足足支撐一陣子了。
但很遺憾，人是貪婪的動物，很快，電腦的數(shù)量就發(fā)展到幾千、幾萬、幾十萬。
第三層
交換機已經(jīng)無法記錄如此龐大的映射關(guān)系了。
此時你動了歪腦筋，你發(fā)現(xiàn)了問題的根本在于，連出去的那根紅色的網(wǎng)線，后面不知道有多少個設(shè)備不斷地連接進來，從而使得地址表越來越大。
那我可不可以讓那根紅色的網(wǎng)線，接入一個新的設(shè)備，這個設(shè)備就跟電腦一樣有自己獨立的MAC地址，而且同時還能幫我把數(shù)據(jù)包做一次轉(zhuǎn)發(fā)呢？
這個設(shè)備就是路由器，它的功能就是，作為一立的擁有MAC地址的設(shè)備，并且可以幫我把數(shù)據(jù)包做一次轉(zhuǎn)發(fā)，你把它定在了網(wǎng)絡(luò)層。
注意，路由器的每一個端口，都有獨立的MAC地址
好了，現(xiàn)在交換機的MAC地址表中，只需要多出一條MAC地址ABAB與其端口的映射關(guān)系，就可以成功把數(shù)據(jù)包轉(zhuǎn)交給路由器了，這條搞定。
那如何做到，把發(fā)送給C和D，甚至是把發(fā)送給DEFGH....的數(shù)據(jù)包，統(tǒng)統(tǒng)先發(fā)送給路由器呢？
不難想到這樣一個點子，假如電腦C和D的MAC地址擁有共同的前綴，比如分別是
C的MAC地址：FFFF-FFFF-CCCCD的MAC地址：FFFF-FFFF-DDDD
那我們就可以說，將目標(biāo)MAC地址為FFFF-FFFF-？開頭的，統(tǒng)統(tǒng)先發(fā)送給路由器。
這樣是否可行呢？是否定的。
我們先從現(xiàn)實中MAC地址的結(jié)構(gòu)入手，MAC地址也叫物理地址、硬件地址，長度為48位，一般這樣來表示
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