3com 8807 User Guide

Perform the following configuration in system view to configure Option 82 
support on DHCP relay for multiple VLAN interfaces at the same time.

Two DHCP clients are on 10.110.0.0, and they acquire IP addresses from the DHCP 
server through a DHCP relay device. The DHCP relay function is enabled on a VLAN 
interface of the switch serving as the DHCP relay. Option 82 support is enabled on 
the DHCP relay.

Configure the strategy for the 
DHCP relay to process the 
request packets that carry 
Option 82 

dhcp relay information 
strategy { drop | keep | replace 
} 

Optional

By default, the DHCP relay 
adopts the strategy replace 
to process the request packets 
that carry Option 82. That is, 
the DHCP relay replaces the 
original Option 82 in the 
packets with its own Option 
82. 

Configure the mode of DHCP 
Relay option 82 

dhcp relay information 
format { normal | verbose } 

Optional

The mode of DHCP Relay 
option 82 is normal by 
default 

Configure the user identifier 
of DHCP Relay option 82 
when it is in 3Com fixed 
network mode 

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

Optional

The user identifier of DHCP 
Relay option 82 is the system 
bridge MAC address by 
default

Table 655   Enable Option 82 support on DHCP relay on the current VLAN interfaces

Enter system view 

system-view 

- 

Enable Option 82 support on 
DHCP relay 

{ interface vlan-interface 
vlan-id [ to vlan-interface 
vlan-id ] | all } 

Optional

This feature is disabled by 
default

Table 654   Enable Option 82 support on DHCP relay on the current VLAN interface