_ Setup
Step1: configure vlan
ZXR10(config)#interface gei_1/1
ZXR10(config-gei_1/1)#switch access vlan 100
ZXR10(config-gei_1/1)#exit
ZXR10(config)#interface gei_1/2
ZXR10(config-gei_1/2)#switch access vlan 100
ZXR10(config-gei_1/2)#exit
Step2:Enable dhcp-snooping on global
ZXR10(config)#ip dhcp snooping enable
Step3:Enable DHCP snooping on vlan and assign Uplink port as trusted port
ZXR10(config)#ip dhcp snooping vlan 100
ZXR10(config)#ip dhcp snooping trust gei_1/1