Spanning Tree Protocol switch and root switch settings

A loop occurs
robustness enhanced network switch is connected, when the problem of a line, the line will be on top of another, but loops. Sending a broadcast message to SwitchE SwitchB, SwitchB will send packets to the entire network will be sent to SwitchA, SwitchA when a broadcast message is received, it will be sent to the whole network, so it will loops

Second, select the root switch
spanning tree protocol, in order to block a broadcast network, cancellation loop
1, Comparative priority (BID), the smaller the value, the switch is the root
2, when comparing the same priority MAC address, MAC address value The minimum is the root switch

Third, viewing the switch port (Spanning Tree Protocol) information
Switch#show spanning-tree

Fourth, the priority is configured to set the root switch
RootID and two BridgeID content and Address Priority root switch pair will be the same, the same contents RootID other switches and root switch

Switch(config)#spanning-tree vlan 1 priority 4096

Fifth, disable the spanning tree
Switch(config)#no spanning-tree vlan 1