Dhcp Option 82 Application Examples - Edge-Core ES4624-SFP Manual

Vlan2:
ip dhcp relay information policy keep
ip dhcp relay information option subscriber-id standard
Vlan3:
ip dhcp relay information policy replace
ip dhcp relay information option subscriber-id foobar
12.2.2.6 debug ip dhcp relay packet
Command：debug ip dhcp relay packet
Function： This command is used to display the information of data packets processing in
DHCP Relay Agent, including the "add" and "peel" action of option 82.
Parameters: None
Command Mode: Admin Mode
User Guide：Use this command during the operation to display the procedure of data
packets processing of the server and to display the corresponding option82 operation
information. identified option 82 information of the request message and the option 82
information returned by the reply message.
Example：
Switch(Config)# debug ip dhcp relay packet

12.3 DHCP option 82 Application Examples

DHCP Client PC1
DHCP Client PC2
Fig 12-2 a DHCP option 82 typical application example
In the above example, layer 2 switches Switch1 and Switch2 are both connected to
layer 3 switch Switch3, Switch 3 will transmit the request message from DHCP client to
DHCP serer as DHCP Relay Agent. It will also transmit the reply message from the
Switch1
Vlan2:eth0/0/3
Switch2
363
DHCP Relay Agent
Switch3
Vlan3
Vlan2:eth1/2
DHCP Server