Edge-Core ES4626 User Manual page 360

Command Mode: Interface configuration mode.
Default Settings：The system uses the standard format to set the circuit-id of option 82
by default.
User Guide：Because the option 82 information added for the switch should cooperate
with the third party DHCP server, if the standard circuit-id format of the switch cannot
satisfy the server's request, this method will be provided for users to specify the contents
of circuit-id according to the situation of the server.
Example：Set the sub-option circuit-id of DHCP option82 as foobar.
Switch(Config-if-Vlan1)# ip dhcp relay information option subscriber-id foobar
12.2.2.4 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)# ip dhcp server relay information enable
12.2.2.5 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 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
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