Please refer to the current edition of the "Internet Official Protocol Standards" STD 1 for the standardization state and status of this protocol. Distribution of this memo is unlimited. This document defines two new options, modeled on the IPv6 options for vendor class and vendor-specific information, that contain Enterprise Numbers to remove ambiguity.
Table vendor option Contents 1.
Adding Vendor and Site Options
Conventions Used in This Document. Supporting Multiple Vendor Instances. Vendor-Identifying Vendor Class Option. IANA Considerations. Security Considerations.
Normative References. Informative References. Author's Address.
Full Copyright Statement. Vendor option there is no prohibition against passing multiple copies of these options in a single packet, doing so would introduce ambiguity of vendor option, particularly if conveying vendor-specific information for multiple vendors. The vendor identified by option 60 defines the interpretation of option 43, which itself carries no vendor identifier. Furthermore, the concatenation of multiple instances of the same option, required by RFC and specified by RFC [ 4 ], means that multiple copies of options 60 or 43 would not remain independent.
In some circumstances, an implementation may need to support multiple, independently defined forms of vendor-specific information.
Option 43 format
For example, implementations that must conform to an industry- standard use of DHCPv4, to allow interoperability in a vendor option technology space, may be required to support the vendor-specific options of that industry group.
But the same implementation may vendor option require support for vendor-specific options defined by the manufacturer.
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This document defines two new options, modeled on the IPv6 options for vendor class and vendor-specific information defined in RFC [ 6 ], that contain IANA-assigned Enterprise Numbers [ 3 ] to remove ambiguity about the interpretation of their contents. If desired, these new options can be used in addition to the current vendor vendor option and vendor information options, whose definition is unaffected by this document.
Supporting Multiple Vendor Instances The options defined in this document may each contain data corresponding to more than one vendor. The data portion of each option defined here contains an enterprise number assigned by IANA [ 3 ]followed by an internal data length, vendor option by vendor- specific data. This sequence may be repeated multiple times within each option.
Because the aggregate of the vendor-specific data for either option may exceed octets, these options are hereby declared to be "concatenation-requiring", as defined by RFC [ 4 ]. As such, for each of the two options defined here, the aggregate of vendor option instances of vendor-specific data is to be considered one long option.
These long options can be divided into smaller options for packet encoding in conformance with RFCon whatever octet boundaries are convenient to the implementation.
Dividing on the boundaries between vendor instances is not three signals for binary options but may be convenient for encoding or packet tracing.
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Vendor-Identifying Vendor Class Option A DHCP client may use this option to unambiguously identify the vendor that manufactured the hardware on vendor option the client is running, the software in use, or an industry consortium to which the vendor belongs.
The information contained in the per-vendor data area of this option is contained in one or more opaque fields that may identify details of the hardware configuration.
Option 43 function
Behavior is undefined if an Enterprise Number occurs multiple times. The information for each Enterprise Number is treated independently, regardless or whether it occurs in an option with other Enterprise Numbers or in a separate option.
How to customize Vendor Option II Multi Vendor Option
Littlefield Standards Track [Page 4] RFC Vendor-Identifying Vendor Options October The vendor-class-data comprises a series of separate items, each of which describes some characteristic of the client's hardware configuration or capabilities. Examples of vendor-class-data instances might include the version of the operating system the client is running or the amount of memory installed on vendor option vendor option.
- Vendor Specific DHCP Options
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Either party may send this option, as needed. Although a typical case might be for a client to send the Vendor- Identifying Vendor Class option, to elicit a useful Vendor- Identifying Vendor-Specific Information Option, there is no requirement for such a flow.
The vendor is indicated in the enterprise-number field.
This option contains information corresponding to one or more Enterprise Numbers. The information for each Enterprise Number is treated independently, regardless or whether it occurs in an option with other Enterprise Numbers, or in vendor option separate option.
When a client broadcasts a request for a configuration, the client includes its vendor client class.
Servers not equipped to interpret the vendor-specific information sent by a client MUST ignore it. The option codes are defined by the vendor identified in the enterprise-number field and are not managed by IANA.
Option codes 0 and have no pre-defined interpretation or format.
Before You Begin
Security Considerations This document in and by itself provides no security, nor does it impact existing security. DHCP provides an authentication and accurate options trading integrity mechanism, as described in RFC [ 8 ], which may be used if authenticity is required for data carried by the options defined in this document. References 7. Normative References [ 1 ] Bradner, S.
DHCP servers and clients use Option 43 to exchange vendor-specific configuration information. PXE server address, which is used to obtain the boot file or other control information from the PXE server.
Informative References [ 5 ] Alexander, S. This document is subject to the rights, licenses and restrictions contained in BCP vendor option except as set forth therein, the authors retain all their rights. Intellectual Property The IETF takes no position regarding the validity or scope of any Intellectual Property Rights or other rights that might be claimed to pertain to the implementation or use vendor option the technology described in this document or the extent to which any license strategy binary options exact such rights might or might not be available; nor does it represent that it has made any independent effort to identify any such rights.
If an endpoint has already obtained a DHCP lease before the server is configured with MC DHCP options, it will be updated with this information when it renews the lease or acquires a new one. A zero client will renew its lease after a reboot or when it detects that the network has returned after going down e.
The IETF invites any interested party to bring to its attention any copyrights, patents or patent applications, or other proprietary rights that may cover technology that may be required to implement this standard. Please address the information to the IETF at ietf- ipr ietf. Littlefield Standards Track [Page 9] Html markup produced by rfcmarkup 1.