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USER’S GUIDE
Switched Rack PDU
114
DHCP response options
Each valid DHCP response contains options that provide the TCP/IP
settings that the Switched Rack PDU needs to operate on a network, and
other information that affects the operation of the Rack PDU.
The Rack PDU uses the Vendor Specific Information option (option 43) in a
DHCP response to determine whether the DHCP response is valid.
Vendor Specific Information (option 43). The Vendor Specific
Information option contains up to two APC specific options encapsulated in
a Tag/Len/Data format: the APC Cookie and the Boot Mode Transition.
APC Cookie. Tag 1, Len 4, Data “1APC”
Option 43 notifies the Rack PDU that a DHCP server has been configured to
service APC devices. By default, the APC Cookie must be present in this
DHCP response option before the Rack PDU can accept the lease.
Following, in hexadecimal format, is an example of a Vendor Specific
Information option that contains the APC cookie:
Option 43 = 0x01 0x04 0x31 0x41 0x50 0x43
Use the DHCP Cookie Is setting described in Switched Rack
PDU settings to disable the APC cookie requirement.