F
IGURE
14: MBA
IN A
W
F
M PXE
ENVIRONMENT
How MBA Works in a Wired for Management Environment using PXE
The MBA ROM first sends a broadcast to all of the servers on the network to see if
one of them is running a DHCP service and has the required information for the PC
(i.e. the PC’s IP address). The response from the DHCP service provides the PC
with its IP address. Also, a Proxy DHCP service running on a Boot Server will
respond to the PC with the IP address of the Boot Server.
The PC then sends a special DHCP request to the Boot Image Negotiation Layer
(BINL) service running on the Boot Server, to get the filename of the network
bootstrap program. The BINL Service replies with the filename.
The PC then sends a TFTP request to the Boot Server to transfer a copy of the
bootstrap file that is stored in the PC's memory as a RAM disk. When the entire
file is received, MBA passes control over to the downloaded file. The bootstrap
then performs the function that it was programmed to do—this may include
downloading further files from the server using TFTP.
N
N
O
O
T
T
E
E
:
:
A WfM transaction works in a manner that is similar to a
traditional TCP/IP environment using DHCP, as described in
65
