锐捷交换机缺省是关闭spanning-tree的，如果网络在物理上存在环路，则必须手工开启spanning-tree。（
举一反三
- 生成树协议(Spanning Tree Protocol)的主要作用是什么?( )
- G is a tree, then G's spanning tree has ( ) tree. A: 1 B: 0 C: 2 D: I'm not sure
- Which two values are used by Spanning Tree Protocol to elect a root bridge? (Choose two.)
- Catalyst 3500(Cisco IOS系统)中配置UplinkFast生成树可选功能的命令格式是——。 A: set spantree uplinkfast enable B: set spantree uplinkfast enable rate C: spanning—tree vlanroot primary D: spanning—tree uplinkfast·
- Under which two circumstances should Spanning Tree Protocol be implemented？ （） A: to ensure a loop-free topology B: to protect against user-side loops C: when a VLAN spans access layer switches D: for the most deterministic and highly available network topology E: because of the risk of lost connectivity without Spanning Tree Protocol