| Internet-Draft | LISP-Vendor-LCAF | July 2022 |
| Rodriguez-Natal, et al. | Expires 7 January 2023 | [Page] |
This document describes a new Locator/ID Separation Protocol (LISP) Canonical Address Format (LCAF), the Vendor Specific LCAF. This LCAF enables organizations to have implementation-specific encodings for LCAF addresses. This document updates RFC8060.¶
This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79.¶
Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet-Drafts is at https://datatracker.ietf.org/drafts/current/.¶
Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress."¶
This Internet-Draft will expire on 7 January 2023.¶
Copyright (c) 2022 IETF Trust and the persons identified as the document authors. All rights reserved.¶
This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (https://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Revised BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Revised BSD License.¶
The LISP Canonical Address Format (LCAF) [RFC8060] defines the format and encoding for different address types that can be used on LISP [I-D.ietf-lisp-rfc6830bis] [I-D.ietf-lisp-rfc6833bis] deployments. However, certain deployments require specific format encodings that may not be applicable outside of the use-case for which they are defined. This document extends [RFC8060] to introduce a Vendor Specific LCAF that defines how organizations can create LCAF addresses to be used only on particular LISP implementations. This document also updates [RFC8060] to specify the behavior when receiving unrecognized LCAF Types.¶
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all capitals, as shown here.¶
[RFC8060] does not explain how an implementation should handle unrecognized LCAF Type. This document updates [RFC8060] to specify that any unrecognized LCAF Type received in a LISP control plane message MUST be ignored. If all Locators are ignored, this is equivalent to a LISP control message with Locator Count = 0, as described in [I-D.ietf-lisp-rfc6833bis]. If an EID-Prefix only contains unrecognized LCAF Types, the LISP control message MUST be dropped and the event MUST be logged.¶
The Vendor Specific LCAF relies on using the IEEE Organizationally Unique Identifier (OUI) [IEEE.802] to prevent collisions across vendors or organizations using the LCAF. The format of the Vendor Specific LCAF is provided below.¶
0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | AFI = 16387 | Rsvd1 | Flags | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Type = TBD | Rsvd2 | Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Rsvd3 | Organizationally Unique Identifier (OUI) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Internal format... | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The fields in the first 8 octets of the above Vendor Specific LCAF are actually the fields defined in the general LCAF format specified in [RFC8060]. The "Type" field MUST be set to the value assigned by IANA to indicate that this is a Vendor Specific LCAF (255 is recommended, see Section 7). The Length field has to be set accordingly to the length of the internal format plus the OUI plus the Rsvd3 fields as for [RFC8060]. The fields defined by the Vendor Specific LCAF are:¶
The Vendor Specific LCAF type SHOULD NOT be used in deployments where different organizations interoperate. However, there may be cases where two (or more) organizations share a common deployment on which they explicitly and mutually agree to use a particular Vendor Specific LCAF. In that case, the organizations involved need to carefully assess the interoperability concerns for that particular deployment. It is NOT RECOMMENDED to use an OUI not assigned to an organization.¶
If a LISP device receives a LISP message containing a Vendor Specific LCAF with an OUI that it does not understand, it MUST drop the message and it SHOULD create a log message.¶
This document enables organizations to define new LCAFs for their internal use. It is the responsibility of these organizations to properly assess the security implications of the formats they define. Security considerations from [RFC8060] apply to this document.¶
The authors would like to thank Joel Halpern, Luigi Iannone, and Alvaro Retana for their suggestions and guidance regarding this document.¶
Following the guidelines of [RFC8126], IANA is asked to assign a value (255 is suggested) for the Vendor Specific LCAF from the "LISP Canonical Address Format (LCAF) Types" registry (defined in [RFC8060]) as follows:¶
| Value # | LISP LCAF Type Name | Reference |
|---|---|---|
| TBD | Vendor Specific | [This Document], Section 4 |