22 Configuring Dhcp Relay; In This Chapter - Alcatel-Lucent OmniSwitch 6800 Series Network Configuration Manual

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22 Configuring DHCP Relay

The User Datagram Protocol (UDP) is a connectionless transport protocol that runs on top of IP networks.

The DHCP Relay allows you to use nonroutable protocols (such as UDP) in a routing environment. UDP

is used for applications that do not require the establishment of a session and end-to-end error checking.

Email and file transfer are two applications that could use UDP. UDP offers a direct way to send and

receive datagrams over an IP network and is primarily used for broadcasting messages. This chapter

describes the DHCP Relay feature. This feature allows UDP broadcast packets to be forwarded across

VLANs that have IP routing enabled.

This chapter describes the basic components of DHCP Relay and how to configure them. CLI commands

are used in the configuration examples. For more details about the syntax of commands, see the

OmniSwitch CLI Reference Guide.

Configuration procedures described in this chapter include:

Quick steps for configuring DHCP Relay on

Setting the IP address for Global DHCP on

Identifying the VLAN for Per-VLAN DHCP on

Enabling BOOTP/DHCP Relay on

Setting the Forward Delay time on

Setting the Maximum Hops value on

Setting the Relay Forwarding Option to Standard, Per-VLAN, or AVLAN on

Using automatic IP configuration to obtain an IP address for the switch on

Configuring relay for generic UDP service ports on

Using the Relay Agent Information Option (Option-82) on

Using DHCP Snooping on

For information about the IP protocol, see

OmniSwitch 6800/6850/9000 Network Configuration Guide

Chapter 18, "Configuring IP."