PLANET WGSW-50040 - Manual (Page 267)

Commands for Security Function Chapter 6 Commands for TACACS+
Function:
This command will enable option 82 function of DHCP Snooping on the switch, the no operation of
this command will disable that function.
Default Settings:
Option 82 function is disabled in DHCP Snooping by default.
Command Mode:
Global Configuration Mode.
Usage Guide:
Only by implementing this command, can DHCP Snooping add standard option 82 to DHCP request
messages and forward the message. The format of option1 in option 82 (Circuit ID option) is
standard vlan name plus physical port name, like “vlan1+ethernet1/12”. That of option2 in option 82
(remote ID option) is CPU MAC of the switch, like “00030f023301”. If a DHCP request message with
option 82 options is received, DHCP Snooping will replace those options in the message with its
own. If a DHCP reply message with option 82 options is received, DHCP Snooping will dump those
options in the message and forward it. This command and “ip dhcp snooping option82 enable”
command are mutually exclusive.
Examples:
Enable option 82 function of DHCP Snooping on the switch.
Switch(config)#ip dhcp snooping enable
Switch(config)# ip dhcp snooping binding enable
Switch(config)# ip dhcp snooping information enable
16.18 ip dhcp snooping option82 enable
Command:
ip dhcp snooping option82 enable
no ip dhcp snooping option82 enable
Function:
To enable DHCP option82 of dot1x in access switch. After DHCP Snooping monitored DHCP
requires packets, add the option82 which can indicate user authentication state to the back of
requires packet, and then deliver to DHCP relay.
Command Mode:
Global Mode.
Default:
The DHCP option82 of dot1x is disabled by default.
Usage Guide: