User`s guide

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USER’S GUIDE masterswitch plus
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DHCP & BOOTP boot process
When Boot mode is set to its default DHCP & BOOTP setting, the
following occurs when the MasterSwitch Plus is started or reset:
1. The MasterSwitch Plus makes up to five requests for its network
assignment from any BOOTP server. If a valid BOOTP response is
received, the unit starts the network services and sets Boot mode to
BOOTP Only.
2. If the MasterSwitch Plus fails to receive a valid BOOTP response after
five BOOTP requests, the unit makes up to five requests for its network
assignment from any DHCP server. If a valid DHCP response is
received, the unit starts the network services and sets Boot mode to
DHCP Only.
3. If the MasterSwitch Plus fails to receive a valid DHCP response after
five DHCP requests, it repeats BOOTP and DHCP requests until it
receives a valid network assignment. First it sends a BOOTP request
every 32 seconds for 12 minutes, then it sends one DHCP request with
a time-out of 64 seconds, and so forth.
To configure the MasterSwitch Plus so that it always uses the
DHCP & BOOTP setting for Boot mode, enable the Remain
in DHCP & BOOTP mode after accepting TCP/IP settings
option, which is disabled by default.
See MasterSwitch Plus settings.
If a DHCP server responds with an invalid offer (e.g., without
the APC Cookie), the MasterSwitch Plus accepts the lease
from that server on the last request of the sequence and
immediately releases that lease. This prevents the DHCP
server from reserving the IP Address associated with its
invalid offer.
For more information on what a valid response requires, see
DHCP response options.