iSCSI Protocol and Broadcom Boot Agent SoftwareNetXtreme User Guide
Broadcom
®
April 2017 • 2CS57XX-CDUM514-R Page 148
DHCP iSCSI Boot Configuration for IPv6
The DHCPv6 server can provide a number of options, including stateless or stateful IP configuration, as well s
information to the DHCPv6 client. For iSCSI boot, Broadcom adapters support the following DHCP
configurations:
• DHCPv6 Option 16, Vendor Class Option
• DHCPv6 Option 17, Vendor-Specific Information
DHCPv6 Option 16, Vendor Class Option
DHCPv6 Option 16 (vendor class option) must be present and must contain a string that matches your
configured DHCP Vendor ID parameter. The DHCP Vendor ID value is BRCM ISAN, as shown in General
Parameters of the iSCSI Boot Configuration menu.
The content of Option 16 should be <2-byte length> <DHCP Vendor ID>.
DHCPv6 Option 17, Vendor-Specific Information
DHCPv6 Option 17 (vendor-specific information) provides more configuration options to the iSCSI client. 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 suboptions are listed below.
The content of option 17 should be <2-byte Option Number 201|202|203> <2-byte length> <data>.
Configuring the DHCP Server
Configure the DHCP server to support Option 16 and Option 17.
Note: The DHCPv6 standard Root Path option is not yet available. Broadcom suggests using Option
16 or Option 17 for dynamic iSCSI Boot IPv6 support.
Table 20: DHCP Option 17 Suboption Definition
Suboption Definition
201 First iSCSI target information in the standard root path format
"iscsi:"[<ser
vername>]"
:"<protoco
l>":"<port>":
"<LUN>":"<t
argetname>
"
202 Second iSCSI target information in the standard root path format
"iscsi:"[<ser
vername>]"
:"<protoco
l>":"<port>":
"<LUN>":"<t
argetname>
"
203 iSCSI initiator IQN
Note: In Table 20, the brackets [ ] are required for the IPv6 addresses.
Note: The format of DHCPv6 Option 16 and Option 17 are fully defined in RFC 3315.
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