Qtech QSW-8200-28T-AC — команды для настройки DHCP Option 82: Руководство пользователя [45/79]

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User Manual

Chapter 3. Commands for DHCP Option 82 45

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 Default Settings: The system uses replace mode to replace the option 82 segment in

the existing message with its own option 82.

 User Guide: Since the DHCP client messages might go through several DHCP Relay

Agents when passed to the DHCP server, the latter Relay Agents on the path should set

policies to decide how to process the option82 added by Relay Agents before them. The

selection of option 82 retransmitting policies should take the configuration policy of the

DHCP server into account.

 Example: Set the retransmitting policy of DHCP messages option 82 as keep.

 Switch(Config-if-Vlan1)# ip dhcp relay information policy keep

3.13 ip dhcp server relay information enable

 Command: ip dhcp server relay information enable

 no ip dhcp server relay information enable

 Function: This command is used to enable the switch DHCP server to identify option82.

The “no ip dhcp server relay information enable” command will make the server ignore

the option 82.

 Parameters: None

 Command Mode: Global configuration mode

 Default Setting: The system disable the option82 identifying function by default.

 User Guide: If the users want the switch DHCP server to identify option82 and return

option 82 information in the reply message, this command needs to be set, or, the

switch DHCP server will ignore the option82.

 Example: Set the DHCP server to support option82

 Switch(Config-if-Vlan1)# ip dhcp server relay information enable

3.14 show ip dhcp relay information option

 Command: show ip dhcp relay information option

 Function: This command will display the state information of the DHCP option 82 in the

system, including option82 enabling switch, the interface retransmitting policy, the

circuit ID mode and the switch DHCP server option82 enabling switch.

 Parameters: None.

 Command Mode: Admin and Global Configuration Mode.

 User Guide: Use this command to check the state information of Relay Agent option82

during operation.

 Example:

 Switch#show ip dhcp relay information option

 ip dhcp server relay information option(i.e. option 82) is disabled

 ip dhcp relay information option(i.e. option 82) is enabled

 Vlan2:

 ip dhcp relay information policy keep