PLANET XGS3-24040 - Manual (Page 352)

26-65
Parameters:
None
Command Mode:
Interface configuration mode.
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
26.3 ip dhcp relay information option subscriber-id
Command:
ip dhcp relay information option subscriber-id {standard | <circuit-id>}
no ip dhcp relay information option subscriber-id
Function:
This command is used to set the format of option82 sub-option1(Circuit ID option) added to the
DHCP request messages from interface, standard means the standard vlan name and physical
port name format, like”Vlan2+Ethernet0/0/12”,<circuit-id> is the circuit-id contents of option82
specified by users, which is a string no longer than 64 characters. The” no ip dhcp relay
information option subscriber-id” command will set the format of added option82 sub-option1
(Circuit ID option) as standard format.
Parameters:
None
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)# ip dhcp relay information option subscriber-id foobar