VLAN如何操作： ·配置在交换机上的每一个VLAN都能执行地址学习、转发/过滤和消除 回路机制，就像一个独立的物理网桥一样。VLAN可能包括几个端口 ·交换机通过将数据转发到与发起端口同一VLAN的目的端口实现VLAN。 ·通常一个端口只运载它所属VLAN的通信量。 VLAN的成员模式： 静态：分配给VLAN的端口由管理员静态（人工）配置。 动态：动态VLAN可基于MAC地址、IP地址等识别其成员资格。当使用MAC 地址时，通常的方式是用VLAN成员资格策略服务器（VMPS）支持动态VL AN。VMPS包括一个映射MAC地址到VLAN分配的数据库。当一个帧到达动态 端口时，交换机根据帧的源地址查询VMPS，获取相应的VLAN分配。

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》

ABB集团执行副总裁尤柯尔 ABB公司在那些地区的雇员大约有10000名。越来越广泛的重组活动是为 了满足在北美和欧洲的部分地区经济衰退的需要。这一年，ABB公司在 研究和发展上面的投资增加了20%。 1992年，公司裁员的速度继续加快，雇员人数减少了14000名，在中欧 和东欧地区的雇员人数增加到了20000名，分布在30多家分公司。在亚 洲，通过联合风险投资、收购、greenfield投资的方式开设了20多家分 公司和服务部门。

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