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Chapter 12 Avaya P330 Layer 3 Features
Avaya P334T-ML User’s Guide 139
BOOTP/DHCP (Dynamic Host Configuration Protocol) Relay
Configuration
BOOTP/DHCP Overview
BOOTP
Short for Bootstrap Protocol, BootP is an Internet protocol that enables a diskless
workstation to discover its own IP address, the IP address of a BOOTP server on the
network, and a file to be loaded into memory to boot the machine. This enables the
workstation to boot without requiring a hard or floppy disk drive. It is used when
the user/station location changes frequently.
The protocol is defined by RFC 951.
DHCP
Short for Dynamic Host Configuration Protocol, DHCP assigns dynamic IP
addresses to devices on a network. With dynamic addressing, a device can have a
different IP address every time it connects to the network. In some systems, the
device's IP address can even change while it is still connected. DHCP also supports
a mix of static and dynamic IP addresses.
Dynamic addressing simplifies network administration because the software keeps
track of IP addresses rather than requiring an administrator to manage the task. This
means that a new computer can be added to a network without the hassle of
manually assigning it a unique IP address. Many ISPs use dynamic IP addressing
for dial-up users. However, dynamic addressing may not be desirable for a network
server.
DHCP/BOOTP Relay
The P330 supports the DHCP/BOOTP Relay Agent function. This is an application
that accepts DHCP/BOOTP requests that are broadcast on one VLAN and sends
them to a DHCP/BOOTP server that connects to another VLAN or a server that
may be located across one or more routers that would otherwise not get the
broadcast request. The relay agent handles the DHCP/BOOTP replies as well,
transmitting them to the client directly or as broadcast, according to a flag in the
reply message. Note that the same DHCP/BOOTP relay agent serves both the
BOOTP and DHCP protocols.
When there is more than one IP interface on a VLAN, the P330 automatically
chooses one of the IP interface’s to determine the relay network. Alternatively, you
can configure the relay networks that the P330 will use. If you have defined more
than one network, the P330 selects the network to be relayed on a Round Robin
basis.