A16B-2200-0450
ABB集團位列全球500強企業，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領域的領導廠商。ABB的技術可 以幫助電力、公共事業和工業客戶提高業績，同時降低對環境的不良影 響。ABB集團業務遍布全球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
聯系人：郭先生
聯系電話：18971415643《優先》
座機：027-83238871
傳真：207-61537051
QQ：810334512《優先》
A16B-2200-0450
生成樹的重計算： 當網絡的拓撲結構發生改變時，生成樹協議重新計算，以生成新的生成 樹結構。當所有交換機的端口狀態變為轉發或阻塞時，意味著重新計算 完畢。這種狀態稱為會聚（Convergence）。 注意：在網絡拓撲結構改變期間，設備直到生成樹會聚才能進行通信， 這可能會對 某些應用產生影響，因此一般認為可以使生成樹運行良好 的交換網絡，不應該超過七層。此外可以通過一些特殊的交換機技術加 快會聚的時間。
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