9–Configuring iSCSI Protocol
iSCSI Boot
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DHCP Option 17, Root Path
Option 17 is used to pass the iSCSI target information to the iSCSI client.
The format of the root path as defined in IETC RFC 4173 is:
"iscsi:"<servername>":"<protocol>":"<port>":"<LUN>":"<targetname>"
lists the DHCP option 17 parameters.
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.
Table 9-2. DHCP Option 17 Parameter Definition
Parameter
Definition
"iscsi:"
A literal string
<servername>
The IP address or fully qualified domain name (FQDN) of the iSCSI
target
":"
Separator
<protocol>
The IP protocol used to access the iSCSI target. Currently, only TCP
is supported so the protocol is 6.
<port>
The port number associated with the protocol. The standard port
number for iSCSI is 3260.
<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 param-
eter 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.
