Allied Telesis AT-S21 - Manual (Page 14)

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In a TCP/IP network, the switch requires a set of IP parameters, such
as a unique IP address and subnet mask, for communication. The
switch obtains its IP parameters in one of the following ways:
❑ You assign the IP parameters through Omega’s System
configuration>IP Parameters menu (described later
in Chapter 2, the section on Menu Navigation Using the
Terminal Interface on page 2-5).
❑ The switch obtains IP parameters from a BootP or DHCP server.
❑ At a later time, you can assign a switch name that’s easy to
remember, using the
System Administration menus
(described later in Chapter 3 in the section, System
Configuration on page 3-10).
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If you have BootP or DHCP, the switch can obtain its IP parameters
from the BootP or DHCP server during startups. In this case, you
simply connect the switch to the network.
The function of the BootP or DHCP utility within an IP server is to
provide IP parameters, including an IP address, to the switch.
Whenever you reset or power on and off the switch, the switch
transmits a request packet to the server every three seconds to
obtain the required IP parameters. The switch makes three request
attempts.
If the requesting switch does not receive a BootP or DHCP response
after the third request, it will operate with a computed pseudo IP
address based on the switch’s MAC address.
If the switch receives a response from the BootP or DHCP server, the
switch extracts the IP address, Subnet Mask, or Gateway/Router
address and uses these parameters to configure itself until the next
power-on or reset. Additionally, if the BootP response packet
specifies a filename and a TFTP host address, then the switch sends a
TFTP get request to the specified host using the specified filename.
This initiates a TFTP download of operating software and allows you
to maintain the downloaded software on your server.