交换机千兆端口1/0/25连接上级核心交换机，以其中一个端口1/0/1配置。
<S3100V2>display dhcp-snooping
DHCP Snooping is disabled. #缺省情况下，DHCP Snooping功能处于关闭状态 DHCP Snooping is enabled.
<S3100V2>system-view
[S3100V2]dhcp-snooping
[S3100V2]display dhcp-snooping DHCP Snooping is enabled.
The client binding table for all ports.
Type : D–Dynamic , S–Stat...