APC Battery Management System - Manual (Page 113)

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USER’S GUIDE
Battery Management System
106
DHCP response options
Each valid DHCP response contains options that provide the TCP/IP
settings a Management Card needs to operate on a network and other
information that affects the Battery Management System’s operation.
The Management Card 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 communicates to the Management Card 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 a Management Card 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
To disable the requirement of an APC cookie, see
Management Card settings for information on the DHCP
Cookie Is setting.