Administrator Guide

Layer 2 Switching Commands 332
DHCP Layer 2 Relay Commands
Dell Networking N1500/N2000/N3000/N4000 Series Switches
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 Dell Networking DHCP Relay supports DHCP Relay Option 82 circuit-
id and remote-id for a VLAN.
Commands in this Section
This section 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.
dhcp l2relay (Global Configuration) show dhcp l2relay stats interface
dhcp l2relay (Interface Configuration) show dhcp l2relay subscription interface
dhcp l2relay circuit-id show dhcp l2relay agent-option vlan
dhcp l2relay remote-id show dhcp l2relay vlan
dhcp l2relay trust show dhcp l2relay circuit-id vlan
dhcp l2relay vlan show dhcp l2relay remote-id vlan
show dhcp l2relay all clear dhcp l2relay statistics interface
show dhcp l2relay interface
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2CSNXXX_SWUM204.book Page 332 Monday, January 25, 2016 1:25 PM