Chapter 12 Avaya P330 Layer 3 Features
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
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.
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