APC MasterSwitch User's Guide download pdf (Page 105)

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USER’S GUIDE

masterswitch plus

DHCP response options

Each valid DHCP response contains options that provide the TCP/IP

settings that the MasterSwitch Plus needs to operate on a network, and

other information that affects the operation of the unit.

The unit 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 unit 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 unit 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 MasterSwitch Plus

settings to disable the APC cookie requirement.

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APC MasterSwitch User's Guide Page 105