Network Working Group
Request for Comments: 4937
Category: Informational

P. Arberg
Redback Networks
V. Mammoliti
Cisco Systems
June 2007

IANA Considerations for PPP over Ethernet (PPPoE)

Status of This Memo

This memo provides information for the Internet community. It does not specify an Internet standard of any kind. Distribution of this memo is unlimited.

Copyright Notice

Abstract

This document describes the IANA considerations for the PPP over Ethernet (PPPoE) protocol.

   1. Introduction ....................................................2
      1.1. Terminology ................................................2
      1.2. Specification of Requirements ..............................2
   2. IANA Considerations .............................................2
      2.1. Registration Policies for PPPoE TAG Values .................2
      2.2. Reserved PPPoE TAG Values ..................................3
      2.3. Registration Policies for PPPoE Code Fields ................3
      2.4. Reserved PPPoE Code fields .................................4
   3. Security Considerations .........................................4
   4. References ......................................................4
      4.1. Normative References .......................................4
      4.2. Informative References .....................................4

1. Introduction

This document provides guidance to the Internet Assigned Numbers Authority (IANA) regarding the registration of values related to the PPP over Ethernet Protocol (PPPoE), defined in [RFC2516], in accordance with BCP 26, [RFC2434]. It also reserves PPPoE TAG values as well as PPPoE packet Code fields, which are or have been in use on the Internet.

1.1. Terminology

   The following terms are used here with the meanings defined in BCP
   26:  "name space", "registration".

The following policies are used here with the meanings defined in BCP 26: "First Come First Served".

1.2. Specification of Requirements

In this document, several words are used to signify the requirements of the specification. These words are often capitalized. The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in [RFC2119].

2. IANA Considerations

The PPPoE protocol, as defined in [RFC2516], defines two name spaces that require registration, the PPPoE TAG and the PPPoE Code field.

2.1. Registration Policies for PPPoE TAG Values

IANA has set up a registry of "PPPoE TAG Values". These are 16-bit values. PPPoE TAG values already in use are specified as reserved in this document. All other TAG values between 0 and 65535 are to be assigned by IANA, using the "First Come First Served" policy defined in [RFC2434].

A TAG-Name and a description for the usage, as well as a point of contact, MUST be provided for any assignment from this registry. A document reference SHOULD also be provided.

2.2. Reserved PPPoE TAG Values

   TAG Value     TAG Name              Tag Description         Reference
   -----------   -------------------   ---------------------   ---------
   0    0x0000   End-Of-List           See the reference       [RFC2516]
   
   257  0x0101   Service-Name          See the reference       [RFC2516]
   258  0x0102   AC-Name               See the reference       [RFC2516]
   259  0x0103   Host-Uniq             See the reference       [RFC2516]
   260  0x0104   AC-Cookie             See the reference       [RFC2516]
   261  0x0105   Vendor-Specific       See the reference       [RFC2516]
   262  0x0106   Credits               See the reference       [RFC4938]
   263  0x0107   Metrics               See the reference       [RFC4938]
   264  0x0108   Sequence Number       See the reference       [RFC4938]
   
   272  0x0110   Relay-Session-Id      See the reference       [RFC2516]
   273  0x0111   HURL                  See the reference       [CARREL]
   274  0x0112   MOTM                  See the reference       [CARREL]
   
   288  0x0120   PPP-Max-Payload       See the reference       [RFC4638]
   289  0x0121   IP_Route_Add          See the reference       [CARREL]
   
   513  0x0201   Service-Name-Error    See the reference       [RFC2516]
   514  0x0202   AC-System-Error       See the reference       [RFC2516]
   515  0x0203   Generic-Error         See the reference       [RFC2516]

2.3. Registration Policies for PPPoE Code Fields

IANA has set up a registry of PPPoE Active Discovery Code fields. These are 8-bit values. PPPoE Code fields already in use are specified as reserved in this document. All other Code values between 0 and 255 are to be assigned by IANA, using the "First Come First Served" policy defined in [RFC2434].

A PPPoE Active Discovery packet name and a description for the usage, as well as a point of contact, MUST be provided for any assignment from this registry.

A document reference SHOULD also be provided.

2.4. Reserved PPPoE Code fields

   Code      PPPoE Packet Name              Description        Reference
   --------  -----------------------------  -----------------  ---------
   0   0x00  PPP Session Stage              See the reference  [RFC2516]
   
   7   0x07  PADO, Offer                    See the reference  [RFC2516]
   9   0x09  PADI, Initiation               See the reference  [RFC2516]
   
   10  0x0a  PADG, Session-Grant            See the reference  [RFC4938]
   11  0x0b  PADC, Session-Credit Response  See the reference  [RFC4938]
   12  0x0c  PADQ, Quality                  See the reference  [RFC4938]
   
   25  0x19  PADR, Request                  See the reference  [RFC2516]
   101 0x65  PADS, Session-confirmation     See the reference  [RFC2516]
   
   167 0xa7  PADT, Terminate                See the reference  [RFC2516]
   
   211 0xd3  PADM, Message                  See the reference  [CARREL]
   212 0xd4  PADN, Network                  See the reference  [CARREL]

3. Security Considerations

This document focuses on IANA considerations for the PPPoE protocol, and as such, should help remove the possibility of the same PPPoE code field and PPPoE TAG value being used for different functionalities.

4. References

4.1. Normative References

   [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
             Requirement Levels", BCP 14, RFC 2119, March 1997.
   
   [RFC2434] Narten, T. and H. Alvestrand, "Guidelines for Writing an
             IANA Considerations Section in RFCs", BCP 26, RFC 2434,
             October 1998.
   
   [RFC2516] Mamakos, L., Lidl, K., Evarts, J., Carrel, D., Simone, D.,
             and R. Wheeler, "A Method for Transmitting PPP Over
             Ethernet (PPPoE)", RFC 2516, February 1999.

4.2. Informative References

   [CARREL]  Carrel D., Simone D., Ho C. and T. Stoner, "Extensions to a
             Method for Transmitting PPP Over Ethernet (PPPoE)", Work in
             Progress.
   
   [RFC4938] Berry, B. and H. Holgate, "PPP Over Ethernet (PPPoE)
             Extensions for Credit Flow and Link Metrics", RFC 4938,
             June 2007.
   
   [RFC4638] Arberg, P., Kourkouzelis, D., Duckett, M., Anschutz, T.,
             and J. Moisand, "Accommodating a Maximum Transit
             Unit/Maximum Receive Unit (MTU/MRU) Greater Than 1492 in
             the Point-to-Point Protocol over Ethernet (PPPoE)", RFC
             4638, September 2006.

Authors' Addresses

Peter Arberg
Redback Networks, Inc.
300 Holger Way
San Jose, CA 95134
USA
EMail: parberg@redback.com

   Vince Mammoliti
   Cisco Systems, Inc.
   181 Bay Street, Suite 3400
   Toronto, Ontario, M5J 2T3
   Canada
   EMail: vince@cisco.com

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