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USER’S GUIDE

Managed Rack PDU

151

DHCP response options

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

Rack PDU needs to operate on a network, and other information that affects the

operation of the Rack PDU.

Vendor Specific Information (option 43). The Rack PDU uses this option in a DHCP

response to determine whether the DHCP response is valid. This option contains a

specific options in a TAG/LEN/DATA format the Vendor Cookie. This is disabled by

default.

• Vendor Cookie. Tag 1, Len 4, Data “1APC”

Option 43 communicates to the Rack PDU that a DHCP server is configured to

service the Dell Rack PDUs.

Following, in hexadecimal format, is an example of a Vendor Specific Information

option that contains the vendor cookie:

Option 43 = 0x01 0x04 0x31 0x41 0x50 0x43

TCP/IP options. The Rack PDU uses the following options within a valid DHCP

response to define its TCP/IP settings. All of these options except the first are

described in RFC2132.

• IP Address (from the yiaddr field of the DHCP response, described in RFC2131):

The IP address that the DHCP server is leasing to the Rack PDU.

• Subnet Mask (option 1): The Subnet Mask value that the Rack PDU needs to

operate on the network.

• Router, i.e., Default Gateway (option 3): The default gateway address that the Rack

PDU needs to operate on the network.

• IP Address Lease Time (option 51): The time duration for the lease of the IP

Address to the Rack PDU.

• Renewal Time, T1 (option 58): The time that the Rack PDU must wait after an IP

address lease is assigned before it can request a renewal of that lease.

• Rebinding Time, T2 (option 59): The time that the Rack PDU must wait after an IP

address lease is assigned before it can seek to rebind that lease.

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Dell Managed PDU LED Manual do Utilizador Página 156