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NetXtreme II User Guide
January 2010
Broadcom Corporation
Page 84 iSCSI Boot Document ENGSRVT52-CDUM100-R
DHCP Option 43, Vendor-Specific Information
DHCP option 43 (vendor-specific information) provides more configuration options to the iSCSI client than DHCP option 17.
In this configuration, three additional suboptions 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.
NOTE: DHCP Option 43 is supported on IPv4 only.
The suboptions are listed below.
Using DHCP option 43 requires more configuration than DHCP option 17, but it provides a richer environment and provides
more configuration options. Broadcom recommends that customers use DHCP option 43 when performing dynamic iSCSI
boot configuration.
Configuring the DHCP Server
Configure the DHCP server to support option 17 or option 43.
NOTE: If using Option 43, you also need to configure Option 60. The value of Option 60 should match the DHCP
Vendor ID value. The DHCP Vendor ID value is BRCM ISAN, as shown in General Parameters of the iSCSI Boot
Configuration menu.
Table 3: DHCP Option 43 Suboption Definition
Suboption 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