This document provides guidance to the Internet Assigned Numbers Authority (IANA) regarding the registration of values related to the Layer Two Tunneling Protocol (L2TP), defined in [RFC2661], in accordance with BCP 26, [RFC2434].
L2TP [RFC2661] defines a number of "magic" numbers to be maintained by the IANA. This section updates the criteria to be used by the IANA to assign additional numbers in each of these lists.
Each of the values identified in this document that require a registration criteria update are currently maintained by IANA and have a range of values from 0 to 65 535, of which a very small number have been allocated (the maximum number allocated within any one range is 46) [L2TP-IANA]. Given the nature of these values, it is not expected that any will ever run into a resource allocation problem if registration allocation requirements are relaxed from their current state.
The recommended criteria changes for IANA registration are listed in the following sections. In one case, the registration criteria is currently defined as First Come First Served and should be made more strict, others are defined as IETF Consensus and need to be relaxed. The relaxation from IETF Consensus is motivated by specific cases in which values that were never intended to be vendor-specific have had to enter early field trials or be released in generally available products with vendor-specific values while awaiting documents to be formalized. In most cases, this results in products that have to support both the vendor-specific value and IETF value indefinitely.
For registration requests where a Designated Expert should be consulted, the responsible IESG Area Director should appoint the Designated Expert.
For registration requests requiring Expert Review, the Designated Expert should consult relevant WGs as appropriate (e.g., the l2tpext WG at the time of this writing).
The basic guideline for the Expert Review process will be to approve the assignment of a value only if there is a document being advanced that clearly defines the values to be assigned, and there is active
Townsley Best Current Practice [Page 2]
RFC 3438 L2TP IANA Considerations December 2002
implementation development (perhaps entering early field or interoperability trails, requiring assigned values to proceed without having to resort to a chosen vendor-specific method).
IANA manages the "Control Message Attribute Value Pairs" [L2TP-IANA] name space, of which 0 - 46 have been assigned. The criteria for assignment was originally IETF Consensus. Further values should be assigned upon Expert Review.
IANA manages the "Message Type AVP (Attribute Type 0) Values" [L2TP- IANA] name space, of which 0 - 16 have been assigned. The criteria for assignment was originally IETF Consensus. Further values should be assigned upon Expert Review.
IANA maintains a list of "Result Code values for the StopCCN message," "Result Code values for the CDN message," and "General Error Codes" [L2TP-IANA]. The criteria for Error Code assignment was originally First Come First Served, and the criteria for CDN and StopCCN Result Codes were originally IETF Consensus. Further values for all Result and Error codes should be assigned upon Expert Review.
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