DELL PC7024 User Manual

DHCP Layer 2 Relay Commands

In the majority of network configurations, DHCP clients and their associated 

servers do not reside on the same IP network or subnet. Therefore, some kind 

of third-party agent is required to transfer DHCP messages between clients 

and servers. Such an agent is known as a DHCP Relay agent.
The DHCP Relay agent accepts DHCP requests from any routed interface, 

including VLANs. The agent relays requests from a subnet without a DHCP 

server to a server or next-hop agent on another subnet. Unlike a router which 

switches IP packets transparently, a DHCP Relay agent processes DHCP 

messages and generates new DHCP messages as a result. 
The PowerConnect DHCP Relay supports DHCP Relay Option 82 circuit-id 

and remote-id for a VLAN.

This chapter explains the following commands:

Use the dhcp l2relay command to enable Layer 2 DHCP Relay functionality. 

The subsequent commands mentioned in this section can only be used when 

the L2-DHCP Relay is enabled. Use the no form of this command to disable 

L2-DHCP Relay.

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2CSPC4.XCT-SWUM2XX1.book  Page 329  Monday, October 3, 2011  11:05 AM