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USER’S GUIDE
switched rack pdu
70
DHCP & BOOTP boot process
When Boot mode is set to its default DHCP & BOOTP setting, the
following occurs when the Switched Rack PDU is started or reset:
1. The Switched Rack PDU makes up to five requests for its network
assignment from any BOOTP server. If a valid BOOTP response is
received, the PDU starts the network services and sets Boot mode to
BOOTP Only.
2. If the Switched Rack PDU fails to receive a valid BOOTP response
after five BOOTP requests, the PDU makes up to five requests for its
network assignment from any DHCP server. If a valid DHCP response
is received, the PDU starts the network services and sets Boot mode
to DHCP Only.
3. If the Switched Rack PDU 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 Switched Rack PDU 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 Switched Rack PDU settings.
If a DHCP server responds with an invalid offer (e.g., without
the APC Cookie), the Switched Rack PDU 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.