7–iSCSI Configuration
Configuring the DHCP Server to Support iSCSI Boot
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AH0054602-00 A
DHCP Option 43, Vendor-specific Information
DHCP Option 43 (vendor-specific information) provides more configuration
options to the iSCSI client than does DHCP Option 17. In this configuration, three
additional sub-options are provided that assign the initiator IQN to the iSCSI boot
client, along with two iSCSI target IQNs that can be used for booting. The format
for the iSCSI target IQN is the same as that of DHCP Option 17, while the iSCSI
initiator IQN is simply the initiator’s IQN.
lists the DHCP Option 43 sub-options.
Using DHCP Option 43 requires more configuration than DHCP Option 17, but it
provides a richer environment and more configuration options. QLogic
recommends that customers use DHCP Option 43 when performing dynamic
iSCSI boot configuration.
<LUN>
The logical unit number to use on the iSCSI target. The value of
the LUN must be represented in hexadecimal format. A LUN
with an ID OF 64 would have to be configured as 40 within the
option 17 parameter on the DHCP server.
<targetname>
The target name in either IQN, or EUI format. Refer to RFC
3720 for details on both IQN and EUI formats. An example IQN
name would be iqn.1995-05.com.QLogic:iscsi-target.
NOTE
DHCP Option 43 is supported on IPv4 only.
Table 7-3. DHCP Option 43 Sub-option Definitions
Sub-option
Definition
201
First iSCSI target information in the standard root path format:
"iscsi:"<servername>":"<protocol>":"<port>":"<LUN>":
"<targetname>"
202
Second iSCSI target information in the standard root path format:
"iscsi:”<servername>":"<protocol>":"<port>":"<LUN>":
"<targetname>"
203
iSCSI initiator IQN
Table 7-2. DHCP Option 17 Parameter Definitions (Continued)
Parameter
Definition
