A16B-2200-0450
ABB集團位列全球500強企業(yè)，集團總部位于瑞士蘇黎世。ABB由兩個歷史 100多年的國際性企業(yè)瑞典的阿西亞公司（ASEA）和瑞士的布朗勃法瑞 公司（BBC Brown Boveri）在1988年合并而成。兩公司分別成立于188 3年和1891年。ABB是電力和自動化技術(shù)領(lǐng)域的領(lǐng)導(dǎo)廠商。ABB的技術(shù)可 以幫助電力、公共事業(yè)和工業(yè)客戶提高業(yè)績，同時降低對環(huán)境的不良影 響。ABB集團業(yè)務(wù)遍布全球100多個國家，擁有13萬名員工，2010年銷售 額高達320億美元。
A16B-2200-0450
聯(lián)系人：郭先生
聯(lián)系電話：18971415643《優(yōu)先》
座機：027-83238871
傳真：207-61537051
QQ：810334512《優(yōu)先》
A16B-2200-0450
生成樹的重計算： 當網(wǎng)絡(luò)的拓撲結(jié)構(gòu)發(fā)生改變時，生成樹協(xié)議重新計算，以生成新的生成 樹結(jié)構(gòu)。當所有交換機的端口狀態(tài)變?yōu)檗D(zhuǎn)發(fā)或阻塞時，意味著重新計算 完畢。這種狀態(tài)稱為會聚（Convergence）。 注意：在網(wǎng)絡(luò)拓撲結(jié)構(gòu)改變期間，設(shè)備直到生成樹會聚才能進行通信， 這可能會對 某些應(yīng)用產(chǎn)生影響，因此一般認為可以使生成樹運行良好 的交換網(wǎng)絡(luò)，不應(yīng)該超過七層。此外可以通過一些特殊的交換機技術(shù)加 快會聚的時間。
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