3com 8807 Reference Guide

replace: Indicates that the DHCP relay replaces Option 82 carried by the packets 
with its own Option 82.

Use the dhcp relay information strategy command to configure the strategy 
for the DHCP relay to process the packets carrying Option 82.

Use the undo dhcp relay information strategy command to restore the default 
strategy.

By default, the replace strategy is adopted.

# Configure the DHCP relay on VLAN interface 1 to drop the request packets 
carrying Option 82.

<SW8800> system-view

 

System View: return to User View with Ctrl+Z

 

[SW8800] interface vlan1

 

[3Com-Vlan-interface1] dhcp relay information strategy  drop 

# Restore the default strategy for the DHCP relay on VLAN interface 1 to process 
the request packets.

[3Com-Vlan-interface1]undo dhcp relay information strategy 

dhcp relay information format verbose node-identifier { mac | sysname | 
user-defined string<1-50> }

VLAN interface view

mac: Sets the bridge MAC as the node identifier of the Option 82 of a relay.

sysname: Sets the system name as the node identifier of the Option 82 of a relay.

user-defined string<1-50>: Sets the bridge-user-defined strings as the node 
identifier of the Option 82 of the relay.

Use the dhcp relay information format verbose node-identifier command to 
set the node identifier of the Option 82 of a relay.

Use the undo dhcp relay information format verbose node-identifier 
command to restore the node identifier of the Option 82 of a relay to the default 
value.

The system sets bridge MAC as the default node identifier of the Option 82 of the 
relay.