ftp.cc.uoc.gr
rfc4446
This is a purely informative rendering of an RFC that includes verified errata. This rendering may not be used as a reference.

The following 'Verified' errata have been incorporated in this document: EID 996
Network Working Group                                         L. Martini
Request for Comments: 4446                            Cisco Systems Inc.
BCP: 116                                                      April 2006
Category: Best Current Practice


     IANA Allocations for Pseudowire Edge to Edge Emulation (PWE3)

Status of This Memo

   This document specifies an Internet Best Current Practices for the
   Internet Community, and requests discussion and suggestions for
   improvements.  Distribution of this memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2006).

Abstract

   This document allocates the fixed pseudowire identifier and other
   fixed protocol values for protocols that have been defined in the
   Pseudo Wire Edge to Edge (PWE3) working group.  Detailed IANA
   allocation instructions are also included in this document.

Table of Contents

   1. Introduction ....................................................2
   2. Specification of Requirements ...................................2
   3. IANA Considerations .............................................2
      3.1. Expert Review Directives ...................................2
      3.2. MPLS Pseudowire Type .......................................3
      3.3. Interface Parameters Sub-TLV Type ..........................4
      3.4. Attachment Identifiers .....................................5
           3.4.1. Attachment Individual Identifier Type ...............5
           3.4.2. Attachment Group Identifier (AGI) Type ..............5
      3.5. Pseudowire Status ..........................................6
      3.6. PW Associated Channel Type .................................6
   4. Security Considerations .........................................7
   5. References ......................................................7
      5.1. Normative References .......................................7
      5.2. Informative References .....................................7

1.  Introduction

   Most of the new IANA registries and respective IANA-allocation
   processes for protocols defined in the PWE3 IETF working group can be
   found in this document.  The IANA registries defined here are in
   general subdivided into three main ranges: a range to be allocated by
   IETF consensus according to [RFC2434], a range to be allocated by the
   expert review process according to [RFC2434], and a range to be
   allocated on a first come, first served basis that is reserved for
   vendor proprietary allocations.  Note that vendor proprietary types
   MUST NOT be registered for IETF standards or extensions thereof,
   whether they are still in development or already completed.

2.  Specification of Requirements

   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].

3.  IANA Considerations

   IANA has created several registries as described in the following
   paragraphs.  Each of these registries contains numeric values used to
   identify data types.  In each of these registries, the value of 0 is
   reserved and MUST not be used.

3.1.  Expert Review Directives

   Throughout this document, allocation procedures for several
   registries call for an expert review process according to [RFC2434].
   The expert should consider the following points:

      *  Duplication of code point allocations should be avoided.

      *  A brief, clear description of the code point allocation
         requested should be provided.

      *  The type allocation requested should be appropriate for the
         particular requested value range in the registry.

   The expert reviewing the request MUST approve or disapprove the
   request within 10 business days from when he or she received the
   expert review request.

3.2.  MPLS Pseudowire Type

EID 996 (Verified) is as follows:

Section: 3.2

Original Text:

   0x0008  SONET/SDH Circuit Emulation Service Over
     MPLS [CEP]

   ...

   0x0010  SONET/SDH Circuit Emulation over Packet [CEP]

Corrected Text:

   0x0008  SONET/SDH Circuit Emulation Service Over
     MPLS Encapsulation [CEM]

  ...

   0x0010  SONET/SDH Circuit Emulation over Packet
     [RFC4842]

Notes:
The 0x0008 value should not have been listed as
allocated to [CEP], now [RFC 4842], only the 0x0010 value is
provided for [CEP]. The 0x0008 value should be associated
with "SONET/SDH Circuit Emulation Service Over MPLS
Encapsulation [CEM]", and a corresponding informative
reference for [CEM] provided.

The IANA PW Type registry has been updated to correct this
error.
IANA has set up the registry of "MPLS Pseudowire Type". This type has 15-bit values. PW Type values 1 through 30 are specified in this document, and PW Type values 31 through 1024 are to be assigned by IANA, using the "Expert Review" policy defined in [RFC2434]. PW Type values 1025 through 4096 and 32767 are to be allocated using the IETF consensus policy defined in [RFC2434]. PW Type values 4097 through 32766 are reserved for vendor-proprietary extensions and are to be assigned by IANA, using the "First Come First Served" policy defined in [RFC2434]. A Pseudowire Type description is required for any assignment from this registry. Additionally, for the vendor- proprietary extensions range, a citation of a person or company name is also required. A document reference should also be provided. Initial Pseudowire Type value allocations are specified below: PW type Description Reference =================================================================== 0x0001 Frame Relay DLCI ( Martini Mode ) [FRAME] 0x0002 ATM AAL5 SDU VCC transport [ATM] 0x0003 ATM transparent cell transport [ATM] 0x0004 Ethernet Tagged Mode [ETH] 0x0005 Ethernet [ETH] 0x0006 HDLC [PPPHDLC] 0x0007 PPP [PPPHDLC] 0x0008 SONET/SDH Circuit Emulation Service Over MPLS [CEP] 0x0009 ATM n-to-one VCC cell transport [ATM] 0x000A ATM n-to-one VPC cell transport [ATM] 0x000B IP Layer2 Transport [RFC3032] 0x000C ATM one-to-one VCC Cell Mode [ATM] 0x000D ATM one-to-one VPC Cell Mode [ATM] 0x000E ATM AAL5 PDU VCC transport [ATM] 0x000F Frame-Relay Port mode [FRAME] 0x0010 SONET/SDH Circuit Emulation over Packet [CEP] 0x0011 Structure-agnostic E1 over Packet [SAToP] 0x0012 Structure-agnostic T1 (DS1) over Packet [SAToP] 0x0013 Structure-agnostic E3 over Packet [SAToP] 0x0014 Structure-agnostic T3 (DS3) over Packet [SAToP] 0x0015 CESoPSN basic mode [CESoPSN] 0x0016 TDMoIP AAL1 Mode [TDMoIP] 0x0017 CESoPSN TDM with CAS [CESoPSN] 0x0018 TDMoIP AAL2 Mode [TDMoIP] 0x0019 Frame Relay DLCI [FRAME] 3.3. Interface Parameters Sub-TLV Type IANA has to set up the registry of "Pseudowire Interface Parameter Sub-TLV types". This type has 8-bit values. Sub-TLV types 1 through 12 are specified in this document. Sub-TLV types 13 through 64 are to be assigned by IANA, using the "Expert Review" policy defined in [RFC2434]. Sub-TLV types 65 through 127 and 255 are to be allocated using the IETF consensus policy defined in [RFC2434]. Sub-TLV types values 128 through 254 are reserved for vendor-proprietary extensions and are to be assigned by IANA, using the "First Come First Served" policy defined in [RFC2434]. Any assignments requested from this registry require a description of up to 54 characters. For each allocation, a length field MUST also be specified in one of the following formats: - Text as follows:"up to X", where X is a decimal integer. - Up to 3 different decimal integers. The text "up to X" means up to and including X. Additionally, for the vendor-proprietary extensions range, a citation of a person or company name is also required. A document reference should also be provided. Initial Pseudowire Interface Parameter Sub-TLV type allocations are specified below: Parameter Length Description Reference ID ======================================================================== 0x01 4 Interface MTU in octets [CRTL] 0x02 4 Maximum Number of concatenated ATM cells [ATM] 0x03 up to 82 Optional Interface Description string [CRTL][RFC2277] 0x04 4 CEP/TDM Payload Bytes [CEP][TDMoIP] 0x05 4 CEP options [CEP] 0x06 4 Requested VLAN ID [ETH] 0x07 6 CEP/TDM bit-rate [CEP][TDMoIP] 0x08 4 Frame-Relay DLCI Length [FRAME] 0x09 4 Fragmentation indicator [FRAG] 0x0A 4 FCS retention indicator [FCS] 0x0B 4/8/12 TDM options [TDMoIP] 0x0C 4 VCCV parameter [VCCV] Note that the Length field is defined as the length of the Sub-TLV, including the Sub-TLV type and length field itself. 3.4. Attachment Identifiers 3.4.1. Attachment Individual Identifier Type IANA has to set up the registry of "Attachment Individual Identifier (AII) Type". This type has 8-bit values. AII Type value 1 is defined in this document. AII Type values 2 through 64 are to be assigned by IANA, using the "Expert Review" policy defined in [RFC2434]. AII Type values 65 through 127 and 255 are to be allocated using the IETF consensus policy defined in [RFC2434]. AII types values 128 through 254 are reserved for vendor-proprietary extensions and are to be assigned by IANA, using the "First Come First Served" policy defined in [RFC2434]. Any assignments requested from this registry require a description of up to 54 characters. For each allocation, a length field MUST also be specified as a decimal integer. Additionally, for the vendor-proprietary extensions range, a citation of a person or company name is also required. A document reference should also be provided. Initial Attachment Individual Identifier (AII) Type allocations are specified below: AII Type Length Description Reference ===================================================================== 0x01 4 A 32 bit unsigned number local [SIG] identifier. 3.4.2. Attachment Group Identifier (AGI) Type IANA has to set up the registry of "Attachment Group Identifier (AGI) Type". This type has 8-bit values. AGI Type value 1 is defined in this document. AGI Type values 2 through 64 are to be assigned by IANA, using the "Expert Review" policy defined in [RFC2434]. AGI Type values 65 through 127 and 255 are to be allocated using the IETF consensus policy defined in [RFC2434]. AGI type values 128 through 254 are reserved for vendor-proprietary extensions and are to be assigned by IANA, using the "First Come First Served" policy defined in [RFC2434]. Any assignments requested from this registry require a description of up to 54 characters. For each allocation, a length field MUST also be specified as a decimal integer. Additionally, for the vendor-proprietary extensions range, a citation of a person or company name is also required. A document reference should also be provided. Initial Attachment Group Identifier (AGI) Type allocations are specified below: AGI Type Length Description Reference =================================================================== 0x01 8 AGI encoded as Route Distinguisher [SIG] 3.5. Pseudowire Status IANA has to set up the registry of "Pseudowire Status Codes". These are bit strings of length 32. Status bits 0 through 4 are defined in this document. Status bits 5 through 31 are to be assigned by IANA using the "Expert Review" policy defined in [RFC2434]. Any requests for allocation from this registry require a description of up to 65 characters. Initial Pseudowire Status Code value allocations are as follows: Bit Mask Description ==================================================================== 0x00000000 - Pseudowire forwarding (clear all failures) [CRTL] 0x00000001 - Pseudowire Not Forwarding [CRTL] 0x00000002 - Local Attachment Circuit (ingress) Receive Fault [CRTL] 0x00000004 - Local Attachment Circuit (egress) Transmit Fault [CRTL] 0x00000008 - Local PSN-facing PW (ingress) Receive Fault [CRTL] 0x00000010 - Local PSN-facing PW (egress) Transmit Fault [CRTL] For the definition of the "PW Associated Channel Type" please refer to [RFC4385]. 3.6 PW Associated Channel Type For the definition of the "PW Associated Channel Type", please refer to [RFC4385]. 4. Security Considerations This document specifies only fixed identifiers, and not the protocols used to carry the encapsulated packets across the network. Each such protocol may have its own set of security issues, but those issues are not affected by the identifiers specified herein. 5. References 5.1. Normative References [RFC2434] Narten, T. and H. Alvestrand, "Guidelines for Writing an IANA Considerations Section in RFCs", BCP 26, RFC 2434, October 1998. [RFC2277] Alvestrand, H., "IETF Policy on Character Sets and Languages", BCP 18, RFC 2277, January 1998. [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. 5.2. Informative References [CRTL] Martini, L., Ed., Rosen, E., El-Aawar, N., Smith, T., and G. Heron, "Pseudowire Setup and Maintenance Using the Label Distribution Protocol (LDP)", RFC 4447, April 2006. [VCCV] Nadeau, T. and R. Aggarwal, "Pseudo Wire Virtual Circuit Connectivity Verification (VCCV)", Work in Progress, August 2005. [FRAG] Malis, A. and M. Townsley, "PWE3 Fragmentation and Reassembly", Work in Progress, September 2005. [FCS] Malis, A., Allan, D., and N. Del Regno, "PWE3 Frame Check Sequence Retention", Work in Progress, September 2005. [CEP] Malis, A., Pate, P., Cohen, R., Ed., and D. Zelig, "SONET/SDH Circuit Emulation Service Over Packet (CEP)", Work in Progress. [SAToP] Vainshtein, A. Ed. and Y. Stein, Ed. "Structure-Agnostic TDM over Packet (SAToP)", Work in Progress. [FRAME] Martini, L., Ed. and C. Kawa, "Encapsulation Methods for Transport of Frame Relay Over MPLS Networks", Work in Progress. [ATM] Martini, L., Ed., El-Aawar, N., and M. Bocci, Ed., "Encapsulation Methods for Transport of ATM Over MPLS Networks", Work in Progress. [PPPHDLC] Martini, L., Rosen, E., Heron, G. and A. Malis, "Encapsulation Methods for Transport of PPP/HDLC Frames Over MPLS Networks", Work in Progress. [ETH] Martini, L., Rosen, E., El-Aawar, N., and G. Heron, "Encapsulation Methods for Transport of Ethernet Frames Over MPLS Networks", RFC 4448, April 2006. [CESoPSN] Vainshtein, A., Ed., Sasson, I., Metz, E., Frost, T., and P. Pate, "Structure-aware TDM Circuit Emulation Service over Packet Switched Network (CESoPSN)", Work in Progress. [TDMoIP] Stein, Y., Shashoua, R., Insler, R., and M. Anavi, "TDM over IP", Work in Progress, February 2005. [RFC3032] Rosen, E., Tappan, D., Fedorkow, G., Rekhter, Y., Farinacci, D., Li, T., and A. Conta, "MPLS Label Stack Encoding", RFC 3032, January 2001. [SIG] Rosen, E., Luo, W., Davie, B., and V. Radoaca, "Provisioning, Autodiscovery, and Signaling in L2VPNs", Work in Progress, September 2005. [RFC4385] Bryant, S., Swallow, G., Martini, L., and D. McPherson, "Pseudowire Emulation Edge-to-Edge (PWE3) Control Word for Use over an MPLS PSN", RFC 4385, February 2006. Author's Address Luca Martini Cisco Systems, Inc. 9155 East Nichols Avenue, Suite 400 Englewood, CO, 80112 EMail: lmartini@cisco.com Full Copyright Statement Copyright (C) The Internet Society (2006). 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