HP Jetdirect J7949e Administrator's Manual page 63

If you change to BOOTP configuration, the DHCP-configured
parameters are released and the TCP/IP protocol is initialized.
If you change to Manual configuration, the DHCP-configured IP
address is released and the user-specified IP parameters are used.
Therefore, if you manually provide the IP address, you
should also manually set all of the configuration
parameters, such as subnet mask, default gateway, and
idle timeout.
Note
For DHCP configuration through Telnet, refer to
this chapter.
ENWW
If you choose to re-enable a DHCP configuration,
the print server will acquire its configuration
information from a DHCP server. This means that
when you choose DHCP and complete your
configuration session (using Telnet, for example),
the TCP/IP protocol for the print server is
re-initialized and all current configuration
information is deleted. The print server then
attempts to acquire new configuration information
by sending DHCP requests on the network to a
DHCP server.
"Using Telnet" in
TCP/IP Configuration 63