Broadcom NetXtreme BCM57 Series User Manual page 146

NetXtreme User Guide
Parameter Definition
A literal string
"iscsi:"
The IP address or FQDN of the iSCSI target
<servername>
Separator
":"
The IP protocol used to access the iSCSI target. Currently, only TCP is supported so the
<protocol>
protocol is 6.
The port number associated with the protocol. The standard port number for iSCSI is
<port>
3260.
The Logical Unit Number to use on the iSCSI target. The value of the LUN must be
<LUN>
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.
The target name in either IQN or EUI format (refer to RFC 3720 for details on both IQN
<targetname>
and EUI formats). An example IQN name would be "iqn.1995-05.com.broadcom:iscsi-
target".
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.
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
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.
Broadcom ®
April 2017 • 2CS57XX-CDUM514-R
Table 18: DHCP Option 17 Parameter Definition
Table 19: DHCP Option 43 Suboption Definition
iSCSI Protocol and Broadcom Boot Agent Software
Page 146