Command Reference Guide

3Com Router 3000 Ethernet Family
Command Reference Guide Chapter 9 DHCP Configuration Commands
3Com Corporation
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9.3.2 dhcp relay information
Syntax
dhcp relay information enable
undo dhcp relay information enable
View
System view
Parameter
None
Description
Use the dhcp relay information enable command to enable the DHCP relay to
support option 82 globally.
Use the undo dhcp relay information enable command to disable the DHCP relay to
support option 82.
Option 82 supported by the DHCP relay can provide up to 255 sub-options. Among
them, only sub-option 1 and sub-option 2 are available at present, allowing the DHCP
relay to insert into a DHCP packet the MAC address and VLAN ID of the switch port
connected to the DHCP client, and the MAC address of the DHCP relay.
By default, DHCP relay is disabled to support option 82.
Example
# Enable DHCP relay to support option 82.
[3Com] dhcp relay information enable
9.3.3 dhcp relay information strategy
Syntax
dhcp relay information strategy { drop | keep | replace }
undo dhcp relay information strategy
View
System view
Parameter
drop: Drops packets.
keep: Leaves option 82 in packets intact.