| RFC 9306 | Vendor-Specific LCAF | October 2022 |
| Rodriguez-Natal, et al. | Experimental | [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 RFC 8060.¶
This document is not an Internet Standards Track specification; it is published for examination, experimental implementation, and evaluation.¶
This document defines an Experimental Protocol for the Internet community. This document is a product of the Internet Engineering Task Force (IETF). It represents the consensus of the IETF community. It has received public review and has been approved for publication by the Internet Engineering Steering Group (IESG). Not all documents approved by the IESG are candidates for any level of Internet Standard; see Section 2 of RFC 7841.¶
Information about the current status of this document, any errata, and how to provide feedback on it may be obtained at https://www.rfc-editor.org/info/rfc9306.¶
Copyright (c) 2022 IETF Trust and the persons identified as the document authors. All rights reserved.¶
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The LISP Canonical Address Format (LCAF) [RFC8060] defines the format and encoding for different address types that can be used on deployments of the Locator/ID Separation Protocol (LISP) [RFC9300] [RFC9301]. 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 an 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 [RFC9301]. If an EID-Prefix only contains unrecognized LCAF types, the LISP control message MUST be dropped and the event MUST be logged. (Here, "EID" refers to Endpoint Identifier.)¶
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 = 255 | 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 255, the value assigned by IANA to indicate that this is a Vendor-Specific LCAF; see Section 6. 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 as follows:¶
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.¶
Following the guidelines of [RFC8126], IANA has assigned the following value for the Vendor-Specific LCAF from the "LISP Canonical Address Format (LCAF) Types" registry (defined in [RFC8060]):¶
| Value | LISP LCAF Type Name | Reference |
|---|---|---|
| 255 | Vendor Specific | RFC 9306, Section 4 |
The authors would like to thank Joel Halpern, Luigi Iannone, and Alvaro Retana for their suggestions and guidance regarding this document.¶