Dell POWEREDGE M1000E - Manual (Page 311)

DHCP Layer 2 Relay Commands 311
10
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.
Commands in this Chapter
This chapter explains the following commands:
dhcp l2relay (Global Configuration)
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.
Syntax
dhcp l2relay
no dhcp l2relay
dhcp l2relay (Global Configuration) dhcp l2relay remote-id
dhcp l2relay (Interface Configuration) dhcp l2relay trust
dhcp l2relay circuit-id dhcp l2relay vlan
2CSPC4.XModular-SWUM200.book Page 311 Thursday, March 10, 2011 11:18 AM