DHCP Relay Overview Configuring DHCP Relay
page 21-6 OmniSwitch AOS Release 7 Network Configuration Guide June 2013
DHCP
DHCP (Dynamic Host Configuration Protocol) provides a framework for passing configuration
information to Internet hosts on a TCP/IP network. It is based on the Bootstrap Protocol (BOOTP), adding
the ability to automatically allocate reusable network addresses and additional configuration options.
DHCP consists of the following two components:
• A protocol for delivering host-specific configuration parameters from a DHCP server to a host.
• A mechanism for allocating network addresses to hosts.
DHCP is built on a client-server model in which a designated DHCP server allocates network addresses
and delivers configuration parameters to dynamically configured hosts. It supports the following three
mechanisms for IP address allocation.
Automatic—DHCP assigns a permanent IP address to a host.
Dynamic—DHCP assigns an IP address to a host for a limited period of time (or until the host
explicitly relinquishes the address).
Manual—The network administrator assigns a host IP address and DHCP simply conveys the assigned
address to the host.
DHCP and the OmniSwitch
The unique characteristics of the DHCP protocol require a good plan before setting up the switch in a
DHCP environment. Since DHCP clients initially have no IP address, placement of these clients in a
VLAN is hard to determine.
The DHCP feature on OmniSwitch provides two services to the network users:
• DHCP Relay Agent
• Generic UDP Relay
The DHCP Relay Agent provides the network interfaces dynamic IP addresses from the DHCP server
present on a different VLAN. This feature can be configured using the ip helper and related commands.
The Generic UDP Relay forwards the broadcast packets with pre-configured destination UDP port
information to destination VLAN or VLANs. This feature can be configured using the ip udp relay and
related commands.
For more information on the CLI commands related to DHCP Relay, see the DHCP Relay Commands
chapter in the OmniSwitch CLI Reference Guide.
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