Cisco 2960-X seriex Switch
Terms：[*]CDP：思科发现协议（CDP：Cisco Discovery Protocol），思科发现协议 CDP 基本上是用来获取相邻设备的协议地址以及发现这些设备的平台。需要注意的是，CDP是工作在 Layer 2 的协议，默认情况下，每60秒以 01-00-0c-cc-cc-cc 为目的地址发送一次组播通告，当达到180秒的holdtime上限后仍未获得邻居设备的通告时，将清除邻居设备信息。
Reference：http://baike.baidu.com/view/51078.htm
2.
To clear the VLAN Membership Policy Server (VMPS) statistics maintained by the VLAN Query Protocol
(VQP) client, use the clear vmps statistics command in privileged EXEC mode.
clear vmps statistics
3.SVI
switch virtual interface (SVI)
When you create an SVI, it does not become active until it is associated with a physical port
4.MTU
Maximum transmission unit size for the VLAN.
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