Qtech QSW-8200-28T-AC — dHCP Snooping Commands User Manual - Configuration Guide [66/79]

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User Manual

Chapter 5. Commands for DHCP Snooping 66

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 Parameter: None.

 Command Mode: Global Mode

 Default: Drop DHCP packets with option82 option received by untrusted ports.

 Usage Guide: Usually the switch with DHCP snooping function connects the terminal

user directly, so close allow-untrusted by default to avoid option82 option added by

user privately. Please set uplink port as trust port when enabling the uplink of DHCP

snooping function.

 Example: Enable the function that receives DHCP packets with option82.

 Switch(config)#ip dhcp snooping information option allow-untrusted

5.18 ip dhcp snooping information option delimiter

 Command: ip dhcp snooping information option delimiter [colon | dot | slash |

space]

o no ip dhcp snooping information option delimiter

 Function: Set the delimiter of each parameter for suboption of option82 in global

mode, no command restores the delimiter as slash.

 Parameters: None.

 Default Settings: slash (“/”).

 Command Mode: Global mode

 Usage Guide: Divide parameters with the configured delimiters after users have

defined them which are used to create suboption (remote-id, circuit-id) of option82 in

global mode.

 Example: Set the parameter delimiters as dot (“.”) for suboption of option82.

 Switch(config)# ip dhcp snooping information option delimiter dot

5.19 ip dhcp snooping information option remote-id

 Command: ip dhcp snooping information option remote-id {standard | <remote-id>}

 no ip dhcp snooping information option remote-id

 Function: Set the suboption2 (remote ID option) content of option 82 added by DHCP

request packets (they are received by the port). The no command sets the additive

suboption2 (remote ID option) format of option 82 as standard.

 Parameters: standard means the default VLAN MAC format. <remote-id> means the

remote-id content of option 82 specified by users, its length can not exceed 64

characters.

 Command Mode: Global Mode

 Default: Use standard format to set remote-id.

 Usage Guide: The additive option 82 needs to associate with third-party DHCP server, it

is used to specify the remote-id content by users when the standard remote-id format

can not satisfy server’s request.

 Example: Set the suboption remote-id of DHCP option82 as street-1-1.