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交换网络根桥选举

对于某个确定的交换网络,存在多台交换机互连,如何确定该网络拓扑呢?

判断参数有:根桥,根端口,指定端口,阻塞端口。

1.首先确定根桥交换机。

选举范围:不同的交换机。

匹配参数:交换机优先级,优先级相同的情况下,比较物理地址大小。

2.其次确定根端口。

选举范围:同一交换机不同端口。

匹配参数:接受根桥交换机发送过来的正常数据帧的链路开销。开销相同比较经过的节点的桥的优先级和物理地址。

如果两台交换机之间有多条链路存在,选取端口序号较小的端口比较参数。

3.然后确定指定端口。

选举范围:两台交换机之前的链路对应的两个接口。

匹配参数:发送BPDU的数据帧的开销。开销相同比较经过的节点的桥的优先级和物理地址。

 4.最后确定阻塞端口。

最后剩下的端口既不是根端口(接收正常数据帧)也不是指定端口(发送正常数据帧),即为阻塞端口。阻塞端口监听数据帧。当正常链路不可达时,阻塞端口开启,冗余链路运行。

注意:

1.所有参数比较选取较小数值。

2.选举范围各部相同。

3.根端口和指定端口处于转发模式,但数据帧发送方向不一样。阻塞端口处于阻塞模式。

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