A16B-2200-0450
ABB集团位列全球500强企业，集团总部位于瑞士苏黎世。ABB由两个历史 100多年的国际性企业瑞典的阿西亚公司（ASEA）和瑞士的布朗勃法瑞 公司（BBC Brown Boveri）在1988年合并而成。两公司分别成立于188 3年和1891年。ABB是电力和自动化技术领域的领导厂商。ABB的技术可 以帮助电力、公共事业和工业客户提高业绩，同时降低对环境的不良影 响。ABB集团业务遍布全球100多个国家，拥有13万名员工，2010年销售 额高达320亿美元。
A16B-2200-0450
联系人：郭先生
联系电话：18971415643《优先》
座机：027-83238871
传真：207-61537051
QQ：810334512《优先》
A16B-2200-0450
生成树的重计算： 当网络的拓扑结构发生改变时，生成树协议重新计算，以生成新的生成 树结构。当所有交换机的端口状态变为转发或阻塞时，意味着重新计算 完毕。这种状态称为会聚（Convergence）。 注意：在网络拓扑结构改变期间，设备直到生成树会聚才能进行通信， 这可能会对 某些应用产生影响，因此一般认为可以使生成树运行良好 的交换网络，不应该超过七层。此外可以通过一些特殊的交换机技术加 快会聚的时间。
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