3com 8807 참조 가이드

C

HAPTER

 47: DHCP C

ONFIGURATION

 C

OMMANDS

# Set the system name as the node identifier when the mode of the relay option 
82 on VLAN interface 1 is 3Com fixed network mode.

<SW8800> system-view

 

System View: return to User View with Ctrl+Z

 

[SW8800]interface vlan1

 

[3Com-Vlan-interface1] dhcp relay information format verbose 

 

node-identifier sysname 

# Restore the default node identifier of the user when the mode of relay option 82 
on VLAN interface 1 is 3Com fixed network mode.

[3Com-Vlan-interface1] undo dhcp relay information format verbose 

 

node-identifier 

System view

None

Use the dhcp server relay information enable command to enable the function 
of Option 82 support on DHCP server.

Use the undo dhcp server relay information enable command to disable the 
function of Option 82 support on DHCP server.

When a client connected to a DHCP relay broadcasts a DHCP request packet, the 
DHCP relay is responsible for forwarding the packet to a DHCP server. After Option 
82 support is enabled on the DHCP server, if the request packet forwarded by the 
DHCP relay to the DHCP server carries Option 82, the response packet sent by the 
DHCP server will carry a response Option 82.

After receiving the response packet from the DHCP server to the DHCP client, the 
DHCP relay check whether Option 82 exists in the packet. If yes, it strips Option 
82. That is, the response packet sent to the client does not carry Option 82.

By default, the function is enabled. That is, the DHCP server will return Option 82 
carried in the request packet to the DHCP relay.

Related command: dhcp relay information enable.

# Enable the DHCP server to return Option 82 carried in the request packets to the 
DHCP relay.