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1990年，ABB公司開始雄心勃勃地將業(yè)務(wù)范圍擴(kuò)展到了中歐和東歐地區(qū)， 并準(zhǔn)備將業(yè)務(wù)范圍擴(kuò)展到亞洲地區(qū)，而在美國(guó)和西歐地區(qū)的收購(gòu)活動(dòng)逐 漸減慢，轉(zhuǎn)而從事合并和重組的活動(dòng)。 1991年，在中歐和東歐地區(qū)繼續(xù)進(jìn)行投資，到這一年底，

聯(lián)系人：郭先生
聯(lián)系電話：18971415643《優(yōu)先》
座機(jī)：027-83238871
傳真：207-61537051
QQ：810334512《優(yōu)先》

注意： 直通式的轉(zhuǎn)發(fā)速度大大快于存儲(chǔ)轉(zhuǎn)發(fā)模式，但可靠性要差一些，因?yàn)榭? 能轉(zhuǎn)發(fā)沖突 幀或帶CRC錯(cuò)誤的幀。 生成樹協(xié)議 消除回路： 在由交換機(jī)構(gòu)成的交換網(wǎng)絡(luò)中通常設(shè)計(jì)有冗余鏈路和設(shè)備。這種設(shè)計(jì)的 目的是防止一個(gè)點(diǎn)的失敗導(dǎo)致整個(gè)網(wǎng)絡(luò)功能的丟失。雖然冗余設(shè)計(jì)能夠 消除單點(diǎn)失敗的問(wèn)題，但也導(dǎo)致了交換回路的產(chǎn)生，它會(huì)導(dǎo)致以下問(wèn)題 。 ·廣播風(fēng)暴 ·同一幀的多份拷貝 ·不穩(wěn)定的MAC地址表 因此，在交換網(wǎng)絡(luò)中必須有一個(gè)機(jī)制來(lái)阻止回路，而生成樹協(xié)議（Spa nning Tree Protocol）的作用正在于此。

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