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rfc:rfc7079

Internet Engineering Task Force (IETF) N. Del Regno, Ed. Request for Comments: 7079 Verizon Communications, Inc. Category: Informational A. Malis, Ed. ISSN: 2070-1721 Consultant

                                                         November 2013

The Pseudowire (PW) and Virtual Circuit Connectivity Verification (VCCV)

                   Implementation Survey Results

Abstract

 The IETF Pseudowire Emulation Edge-to-Edge (PWE3) working group has
 defined many encapsulations of various layer 1 and layer 2 service-
 specific PDUs and circuit data.  In most of these encapsulations, use
 of the Pseudowire (PW) Control Word is required.  However, there are
 several encapsulations for which the Control Word is optional, and
 this optionality has been seen in practice to possibly introduce
 interoperability concerns between multiple implementations of those
 encapsulations.  This survey of the Pseudowire / Virtual Circuit
 Connectivity Verification (VCCV) user community was conducted to
 determine implementation trends and the possibility of always
 mandating the Control Word.

Status of This Memo

 This document is not an Internet Standards Track specification; it is
 published for informational purposes.
 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 a candidate for any level of Internet
 Standard; see Section 2 of RFC 5741.
 Information about the current status of this document, any errata,
 and how to provide feedback on it may be obtained at
 http://www.rfc-editor.org/info/rfc7079.

Del Regno & Malis Informational [Page 1] RFC 7079 PW/VCCV Implementation Survey Results November 2013

Copyright Notice

 Copyright (c) 2013 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
 (http://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 Simplified BSD License text as described in Section 4.e of
 the Trust Legal Provisions and are provided without warranty as
 described in the Simplified BSD License.

Del Regno & Malis Informational [Page 2] RFC 7079 PW/VCCV Implementation Survey Results November 2013

Table of Contents

 1. Introduction ....................................................4
    1.1. PW/VCCV Survey Overview ....................................5
    1.2. PW/VCCV Survey Form ........................................5
    1.3. PW/VCCV Survey Highlights ..................................7
 2. Survey Results ..................................................8
    2.1. Summary of Results .........................................8
    2.2. Respondents ................................................8
    2.3. Pseudowire Encapsulations Implemented ......................9
    2.4. Number of Pseudowires Deployed ............................10
    2.5. VCCV Control Channel in Use ...............................11
    2.6. VCCV Connectivity Verification Types in Use ...............14
    2.7. Control Word Support for Encapsulations for Which
         CW Is Optional ............................................16
    2.8. Open-Ended Question .......................................17
 3. Security Considerations ........................................18
 4. Acknowledgements ...............................................18
 5. Informative References .........................................19
 Appendix A. Survey Responses ......................................20
   A.1. Respondent 1 ...............................................20
   A.2. Respondent 2 ...............................................21
   A.3. Respondent 3 ...............................................22
   A.4. Respondent 4 ...............................................23
   A.5. Respondent 5 ...............................................24
   A.6. Respondent 6 ...............................................25
   A.7. Respondent 7 ...............................................27
   A.8. Respondent 8 ...............................................28
   A.9. Respondent 9 ...............................................29
   A.10. Respondent 10 .............................................30
   A.11. Respondent 11 .............................................31
   A.12. Respondent 12 .............................................32
   A.13. Respondent 13 .............................................33
   A.14. Respondent 14 .............................................35
   A.15. Respondent 15 .............................................36
   A.16. Respondent 16 .............................................38
   A.17. Respondent 17 .............................................39

Del Regno & Malis Informational [Page 3] RFC 7079 PW/VCCV Implementation Survey Results November 2013

1. Introduction

 Most Pseudowire Emulation Edge-to-Edge (PWE3) encapsulations mandate
 the use of the Control Word (CW) to carry information essential to
 the emulation, to inhibit Equal-Cost Multipath (ECMP) behavior, and
 to discriminate Operations, Administration, and Maintenance (OAM)
 from Pseudowire (PW) packets.  However, some encapsulations treat the
 Control Word as optional.  As a result, implementations of the CW,
 for encapsulations for which it is optional, vary by equipment
 manufacturer, equipment model, and service provider network.
 Similarly, Virtual Circuit Connectivity Verification (VCCV) supports
 three Control Channel (CC) types and multiple Connectivity
 Verification (CV) types.  This flexibility has led to reports of
 interoperability issues within deployed networks and associated
 documents to attempt to remedy the situation.
 The encapsulations and modes for which the Control Word is currently
 optional are:
 o  Ethernet Tagged Mode [RFC4448]
 o  Ethernet Raw Mode [RFC4448]
 o  Point-to-Point Protocol (PPP) [RFC4618]
 o  High-Level Data Link Control (HDLC) [RFC4618]
 o  Frame Relay Port Mode [RFC4618]
 o  ATM (N:1 Cell Mode) [RFC4717]
 Virtual Circuit Connectivity Verification (VCCV) [RFC5085] defines
 three Control Channel types for MPLS PWs: Type 1, using the PW
 Control Word; Type 2, using the Router Alert (RA) Label; and Type 3,
 using Time to Live (TTL) Expiration (e.g., MPLS PW Label with TTL ==
 1).  While Type 2 (RA Label) is indicated as being "the preferred
 mode of VCCV operation when the Control Word is not present", RFC
 5085 does not indicate a mandatory Control Channel to ensure
 interoperable implementations.  The closest it comes to mandating a
 control channel is the requirement to support Type 1 (Control Word)
 whenever the CW is present.  As such, the three options yield seven
 implementation permutations (assuming you have to support at least
 one Control Channel type to provide VCCV).  Due to these
 permutations, interoperability challenges have been identified by
 several VCCV users.

Del Regno & Malis Informational [Page 4] RFC 7079 PW/VCCV Implementation Survey Results November 2013

 In order to assess the best approach to address the observed
 interoperability issues, the PWE3 working group decided to solicit
 feedback from the PW and VCCV user community regarding
 implementation.  This document presents the survey questionnaire and
 the information returned by those in the user community who
 participated.

1.1. PW/VCCV Survey Overview

 Per the direction of the PWE3 working group chairs, a survey was
 created to sample the nature of implementations of PWs, with specific
 emphasis on Control Word usage, and VCCV, with emphasis on Control
 Channel and Control Type usage.  The survey consisted of a series of
 questions based on direction of the WG chairs and the survey opened
 to the public on November 4, 2010.  The survey was conducted using
 the SurveyMonkey tool, http://www.surveymonkey.com.  The survey ran
 from November 4, 2010 until February 25, 2011 and was repeatedly
 publicized on the PWE3 email list over that period.
 The editors took precautions to ensure the validity of the sample and
 the data.  Specifically, only responses with recognizable non-vendor
 company-affiliated email addresses were accepted.  Unrecognizable or
 personal email addresses would have been contacted to determine their
 validity, but none were received.  Only one response was received
 from each responding company.  If multiple responses from a company
 had been received, they would have been contacted to determine
 whether the responses were duplicative or additive.  This, however,
 did not occur.

1.2. PW/VCCV Survey Form

 The PW/VCCV Implementation Survey requested the following information
 about user implementations (the lists of implementation choices were
 taken verbatim from the survey):
  1. Responding Organization. No provisions were made for anonymous

responses, as all responses required a valid email address in

    order to validate the survey response.  However, the results
    herein are reported anonymously, except for an alphabetic list of
    participating organizations in Section 2.2.

Del Regno & Malis Informational [Page 5] RFC 7079 PW/VCCV Implementation Survey Results November 2013

  1. Of the various encapsulations (and options therein) known at the

time, including the WG document, "Encapsulation Methods for

    Transport of Fibre Channel" (now [RFC6307]), which were
    implemented by the respondent.  These included:
    o  Ethernet Tagged Mode - RFC 4448
    o  Ethernet Raw Mode - RFC 4448
    o  Structure-Agnostic Time Division Multiplexing (TDM) over Packet
       (SAToP) - RFC 4553
    o  PPP - RFC 4618
    o  HDLC - RFC 4618
    o  Frame Relay (Port Mode) - RFC 4619
    o  Frame Relay (1:1 Mode) - RFC 4619
    o  ATM (N:1 Mode) - RFC 4717
    o  ATM (1:1 Mode) - RFC 4717
    o  ATM (AAL5 Service Data Unit (SDU) Mode) - RFC 4717
    o  ATM (AAL5 PDU Mode) - RFC 4717
    o  Circuit Emulation over Packet (CEP) - RFC 4842
    o  Circuit Emulation Service over Packet Switched Network
       (CESoPSN) - RFC 5086
    o  Time Division Multiplexing over IP (TDMoIP) - RFC 5087
    o  Fiber Channel (Port Mode) - "Encapsulation Methods for
       Transport of Fibre Channel" (now RFC 6307)
  1. Approximately how many PWs of each type were deployed.

Respondents could list a number, or for the sake of privacy, could

    just respond "In-Use" instead.

Del Regno & Malis Informational [Page 6] RFC 7079 PW/VCCV Implementation Survey Results November 2013

  1. For each encapsulation listed above, the respondent could indicate

which Control Channel [RFC5085] was in use. (See Section 1 for a

    discussion of these Control Channels.)  The options listed were:
    o  Control Word (Type 1)
    o  Router Alert Label (Type 2)
    o  TTL Expiry (Type 3)
  1. For each encapsulation listed above, the respondent could indicate

which Connectivity Verification types [RFC5085] were in use. The

    options were:
    o  Internet Control Message Protocol (ICMP) Ping
    o  Label Switched Path (LSP) Ping
  1. For each encapsulation type for which the Control Word is

optional, the respondents could indicate the encapsulation(s) for

    which Control Word was supported by the equipment vendor, and
    whether the CW was also in use in the network.  The encapsulations
    listed were:
    o  Ethernet (Tagged Mode)
    o  Ethernet (Raw Mode)
    o  PPP
    o  HDLC
    o  Frame Relay (Port Mode)
    o  ATM (N:1 Cell Mode)
  1. Finally, a free-form entry was provided for the respondent to

provide feedback regarding PW and VCCV deployments, VCCV

    interoperability challenges, or the survey or any other network/
    vendor details they wished to share.

1.3. PW/VCCV Survey Highlights

 There were seventeen responses to the survey that met the validity
 requirements in Section 1.1.  The responding companies are listed
 below in Section 2.2.

Del Regno & Malis Informational [Page 7] RFC 7079 PW/VCCV Implementation Survey Results November 2013

2. Survey Results

2.1. Summary of Results

 Prior to this survey, there was considerable speculation about
 whether the Control Word could always be mandated, with several
 proposals to do so.  However, the survey showed that there was
 considerable deployment of PWs that did not use the CW.  The
 publication of this survey serves as a reminder of the extent of PWs
 without the CW in use, and hence a reminder that the CW-less modes
 cannot be deprecated in the near future.

2.2. Respondents

 The following companies, listed here alphabetically as received in
 the survey responses, participated in the PW/VCCV Implementation
 Survey.  Responses were only solicited from non-vendors (users and
 service providers), and no vendors responded (although if they had,
 their response would not have been included).  The data provided has
 been aggregated.  No specific company's response will be detailed
 herein.
 o  AboveNet
 o  AMS-IX
 o  Bright House Networks
 o  Cox Communications
 o  Deutsche Telekom AG
 o  Easynet Global Services
 o  France Telecom Orange
 o  Internet Solution
 o  MTN South Africa
 o  OJSC MegaFon
 o  Superonline
 o  Telecom New Zealand
 o  Telstra Corporation

Del Regno & Malis Informational [Page 8] RFC 7079 PW/VCCV Implementation Survey Results November 2013

 o  Time Warner Cable
 o  Tinet
 o  Verizon
 o  Wipro Technologies

2.3. Pseudowire Encapsulations Implemented

 The following request was made: "In your network in general, across
 all products, please indicate which pseudowire encapsulations your
 company has implemented."  Of all responses, the following list shows
 the percentage of responses for each encapsulation:
 o  Ethernet Tagged Mode - RFC 4448 = 76.5%
 o  Ethernet Raw Mode - RFC 4448 = 82.4%
 o  SAToP - RFC 4553 = 11.8%
 o  PPP - RFC 4618 = 11.8%
 o  HDLC - RFC 4618 = 5.9%
 o  Frame Relay (Port Mode) - RFC 4619 = 17.6%
 o  Frame Relay (1:1 Mode) - RFC 4619 = 41.2%
 o  ATM (N:1 Mode) - RFC 4717 = 5.9%
 o  ATM (1:1 Mode) - RFC 4717 = 17.6%
 o  ATM (AAL5 SDU Mode) - RFC 4717 = 5.9%
 o  ATM (AAL5 PDU Mode) - RFC 4717 = 0.0%
 o  CEP - RFC 4842 = 0.0%
 o  CESoPSN - RFC 5086 = 11.8%
 o  TDMoIP - RFC 5087 = 11.8%
 o  Fiber Channel (Port Mode) - "Encapsulation Methods for Transport
    of Fibre Channel" (now RFC 6307) = 5.9%

Del Regno & Malis Informational [Page 9] RFC 7079 PW/VCCV Implementation Survey Results November 2013

2.4. Number of Pseudowires Deployed

 The following question was asked: "Approximately how many pseudowires
 are deployed of each encapsulation type.  Note, this should be the
 number of pseudowires in service, carrying traffic, or pre-positioned
 to do so."  The following list shows the number of pseudowires in use
 for each encapsulation:
 o  Ethernet Tagged Mode = 93,861
 o  Ethernet Raw Mode = 94,231
 o  SAToP - RFC 4553 = 20,050
 o  PPP - RFC 4618 = 500
 o  HDLC - RFC 4618 = 0
 o  Frame Relay (Port Mode) - RFC 4619 = 5,002
 o  Frame Relay (1:1 Mode) - RFC 4619 = 50,959
 o  ATM (N:1 Mode) - RFC 4717 = 50,000
 o  ATM (1:1 Mode) - RFC 4717 = 70,103
 o  ATM (AAL5 SDU Mode) - RFC 4717 = 0
 o  ATM (AAL5 PDU Mode) - RFC 4717 = 0
 o  CEP - RFC 4842 = 0
 o  CESoPSN - RFC 5086 = 21,600
 o  TDMoIP - RFC 5087 = 20,000
 o  Fiber Channel (Port Mode) - "Encapsulation Methods for Transport
    of Fibre Channel" (now RFC 6307) = 0
 In the above responses (on several occasions), the response was in
 the form of "> XXXXX" where the response indicated a number greater
 than the one provided.  Where applicable, the number itself was used
 in the sums above.  For example, ">20K" and "20K+" yielded 20K.

Del Regno & Malis Informational [Page 10] RFC 7079 PW/VCCV Implementation Survey Results November 2013

 Additionally, the following encapsulations were listed as "In-Use"
 with no quantity provided:
 o  Ethernet Raw Mode: 2 Responses
 o  ATM (AAL5 SDU Mode): 1 Response
 o  TDMoIP: 1 Response

2.5. VCCV Control Channel in Use

 The following instructions were given: "Please indicate which VCCV
 Control Channel is used for each encapsulation type.  Understanding
 that users may have different networks with varying implementations,
 for your network in general, please select all which apply."  The
 numbers below indicate the number of responses.  The responses were:
 o  Ethernet Tagged Mode - RFC 4448
  • Control Word (Type 1) = 7
  • Router Alert Label (Type 2) = 3
  • TTL Expiry (Type 3) = 3
 o  Ethernet Raw Mode - RFC 4448
  • Control Word (Type 1) = 8
  • Router Alert Label (Type 2) = 4
  • TTL Expiry (Type 3) = 4
 o  SAToP - RFC 4553
  • Control Word (Type 1) = 1
  • Router Alert Label (Type 2) = 0
  • TTL Expiry (Type 3) = 0
 o  PPP - RFC 4618
  • Control Word (Type 1) = 0
  • Router Alert Label (Type 2) = 0
  • TTL Expiry (Type 3) = 0

Del Regno & Malis Informational [Page 11] RFC 7079 PW/VCCV Implementation Survey Results November 2013

 o  HDLC - RFC 4618
  • Control Word (Type 1) = 0
  • Router Alert Label (Type 2) = 0
  • TTL Expiry (Type 3) = 0
 o  Frame Relay (Port Mode) - RFC 4619
  • Control Word (Type 1) = 1
  • Router Alert Label (Type 2) = 0
  • TTL Expiry (Type 3) = 0
 o  Frame Relay (1:1 Mode) - RFC 4619
  • Control Word (Type 1) = 3
  • Router Alert Label (Type 2) = 0
  • TTL Expiry (Type 3) = 2
 o  ATM (N:1 Mode) - RFC 4717
  • Control Word (Type 1) = 1
  • Router Alert Label (Type 2) = 0
  • TTL Expiry (Type 3) = 0
 o  ATM (1:1 Mode) - RFC 4717
  • Control Word (Type 1) = 1
  • Router Alert Label (Type 2) = 0
  • TTL Expiry (Type 3) = 1
 o  ATM (AAL5 SDU Mode) - RFC 4717
  • Control Word (Type 1) = 0
  • Router Alert Label (Type 2) = 1
  • TTL Expiry (Type 3) = 0

Del Regno & Malis Informational [Page 12] RFC 7079 PW/VCCV Implementation Survey Results November 2013

 o  ATM (AAL5 PDU Mode) - RFC 4717
  • Control Word (Type 1) = 0
  • Router Alert Label (Type 2) = 0
  • TTL Expiry (Type 3) = 0
 o  CEP - RFC 4842
  • Control Word (Type 1) = 0
  • Router Alert Label (Type 2) = 0
  • TTL Expiry (Type 3) = 0
 o  CESoPSN - RFC 5086
  • Control Word (Type 1) = 0
  • Router Alert Label (Type 2) = 0
  • TTL Expiry (Type 3) = 1
 o  TDMoIP - RFC 5087
  • Control Word (Type 1) = 0
  • Router Alert Label (Type 2) = 0
  • TTL Expiry (Type 3) = 0
 o  Fiber Channel (Port Mode) - "Encapsulation Methods for Transport
    of Fibre Channel" (now RFC 6307)
  • Control Word (Type 1) = 0
  • Router Alert Label (Type 2) = 0
  • TTL Expiry (Type 3) = 0

Del Regno & Malis Informational [Page 13] RFC 7079 PW/VCCV Implementation Survey Results November 2013

2.6. VCCV Connectivity Verification Types in Use

 The following instructions were given: "Please indicate which VCCV
 Connectivity Verification types are used in your networks for each
 encapsulation type."  Note that Bidirectional Forwarding Detection
 (BFD) was not one of the choices.  The responses were as follows:
 o  Ethernet Tagged Mode - RFC 4448
  • ICMP Ping = 5
  • LSP Ping = 11
 o  Ethernet Raw Mode - RFC 4448
  • ICMP Ping = 6
  • LSP Ping = 11
 o  SAToP - RFC 4553
  • ICMP Ping = 0
  • LSP Ping = 2
 o  PPP - RFC 4618
  • ICMP Ping = 0
  • LSP Ping = 0
 o  HDLC - RFC 4618
  • ICMP Ping = 0
  • LSP Ping = 0
 o  Frame Relay (Port Mode) - RFC 4619
  • ICMP Ping = 0
  • LSP Ping = 1
 o  Frame Relay (1:1 Mode) - RFC 4619
  • ICMP Ping = 2
  • LSP Ping = 5

Del Regno & Malis Informational [Page 14] RFC 7079 PW/VCCV Implementation Survey Results November 2013

 o  ATM (N:1 Mode) - RFC 4717
  • ICMP Ping = 0
  • LSP Ping = 1
 o  ATM (1:1 Mode) - RFC 4717
  • ICMP Ping = 0
  • LSP Ping = 3
 o  ATM (AAL5 SDU Mode) - RFC 4717
  • ICMP Ping = 0
  • LSP Ping = 1
 o  ATM (AAL5 PDU Mode) - RFC 4717
  • ICMP Ping = 0
  • LSP Ping = 0
 o  CEP - RFC 4842
  • ICMP Ping = 0
  • LSP Ping = 0
 o  CESoPSN - RFC 5086
  • ICMP Ping = 0
  • LSP Ping = 1
 o  TDMoIP - RFC 5087
  • ICMP Ping = 0
  • LSP Ping = 1
 o  Fiber Channel (Port Mode) - "Encapsulation Methods for Transport
    of Fibre Channel" (now RFC 6307)
  • ICMP Ping = 0
  • LSP Ping = 0

Del Regno & Malis Informational [Page 15] RFC 7079 PW/VCCV Implementation Survey Results November 2013

2.7. Control Word Support for Encapsulations for Which CW Is Optional

 The following instructions were given: "Please indicate your
 network's support of and use of the Control Word for encapsulations
 for which the Control Word is optional."  The responses were:
 o  Ethernet (Tagged Mode)
  • Supported by Network/Equipment = 13
  • Used in Network = 6
 o  Ethernet (Raw Mode)
  • Supported by Network/Equipment = 14
  • Used in Network = 7
 o  PPP
  • Supported by Network/Equipment = 5
  • Used in Network = 0
 o  HDLC
  • Supported by Network/Equipment = 4
  • Used in Network = 0
 o  Frame Relay (Port Mode)
  • Supported by Network/Equipment = 3
  • Used in Network = 1
 o  ATM (N:1 Cell Mode)
  • Supported by Network/Equipment = 5
  • Used in Network = 1

Del Regno & Malis Informational [Page 16] RFC 7079 PW/VCCV Implementation Survey Results November 2013

2.8. Open-Ended Question

 Space was provided for user feedback.  The following instructions
 were given: "Please use this space to provide any feedback regarding
 PW and VCCV deployments, VCCV interoperability challenges, this
 survey or any network/vendor details you wish to share."  Below are
 the responses, made anonymous.  The responses are otherwise provided
 here verbatim.
 1.  BFD VCCV Control Channel is not indicated in the survey (may be
     required for PW redundancy purpose)
 2.  Using CV is not required at the moment
 3.  COMPANY has deployed several MPLS network elements, from multiple
     vendors.  COMPANY is seeking a uniform implementation of VCCV
     Control Channel (CC) capabilities across its various vendor
     platforms.  This will provide COMPANY with significant advantages
     in reduced operational overheads when handling cross-domain
     faults.  Having a uniform VCCV feature implementation in COMPANY
     multi-vendor network leads to:
     o  Reduced operational cost and complexity
     o  Reduced OSS development to coordinate incompatible VCCV
        implementations.
     o  Increased end-end service availability when handing faults.
     In addition, currently some of COMPANY deployed VCCV traffic
     flows (on some vendor platforms) are not guaranteed to follow
     those of the customer's application traffic (a key operational
     requirement).  As a result, the response from the circuit ping
     cannot faithfully reflect the status of the circuit.  This leads
     to ambiguity regarding the operational status of our networks.
     An in-band method is highly preferred, with COMPANY having a
     clear preference for VCCV Circuit Ping using PWE Control Word.
     This preference is being pursued with each of COMPANY vendors.
 4.  PW VCCV is very useful tool for finding faults in each PW
     channel.  Without this we can not find fault on a PW channel.  PW
     VCCV using BFD is another better option.  Interoperability
     challenges are with Ethernet OAM mechanism.

Del Regno & Malis Informational [Page 17] RFC 7079 PW/VCCV Implementation Survey Results November 2013

 5.  We are using L2PVPN AToM like-to-like models - ATMoMPLS - EoMPLS
     ATMoMPLS : This service offered for transporting ATM cells over
     IP/MPLS core with Edge ATM CE devices including BPX, Ericsson
     Media Gateway etc.  This is purely a Port mode with cell-packing
     configuration on it to have best performance.  QoS marking is
     done for getting LLQ treatment in the core for these MPLS
     encapsulated ATM packets.  EoMPLS: This service offered for
     transporting 2G/3G traffic from network such as Node-B to RNC's
     over IP/MPLS backbone core network.  QoS marking is done for
     getting guaranteed bandwidth treatment in the core for these MPLS
     encapsulated ATM packets.  In addition to basic L2VPN service
     configuration, these traffic are routed via MPLS TE tunnels with
     dedicated path and bandwidth defined to avoid bandwidth related
     congestion.
 6.  EQUIPMENT MANUFACTURER does not provide options to configure VCCV
     control-channel and its sub options for LDP based L2Circuits.
     How can we achieve end-to-end management and fault detection of
     PW without VCCV in such cases?
 7.  I'm very interested in this work as we continue to experience
     interop challenges particularly with newer vendors to the space
     who are only implementing VCCV via control word.  Vendors who
     have tailed their MPLS OAM set specifically to the cell backhaul
     space and mandatory CW have been known to fall into this space.
     That's all I've got.

3. Security Considerations

 As this document is an informational report of the PW/VCCV User
 Implementation Survey results, no protocol security considerations
 are introduced.

4. Acknowledgements

 We would like to thank the chairs of the PWE3 working group for their
 guidance and review of the survey questions.  We would also like to
 sincerely thank those listed in Section 2.2. who took the time and
 effort to participate.

Del Regno & Malis Informational [Page 18] RFC 7079 PW/VCCV Implementation Survey Results November 2013

5. Informative References

 [RFC4448]  Martini, L., Rosen, E., El-Aawar, N., and G. Heron,
            "Encapsulation Methods for Transport of Ethernet over MPLS
            Networks", RFC 4448, April 2006.
 [RFC4618]  Martini, L., Rosen, E., Heron, G., and A. Malis,
            "Encapsulation Methods for Transport of PPP/High-Level
            Data Link Control (HDLC) over MPLS Networks", RFC 4618,
            September 2006.
 [RFC4717]  Martini, L., Jayakumar, J., Bocci, M., El-Aawar, N.,
            Brayley, J., and G. Koleyni, "Encapsulation Methods for
            Transport of Asynchronous Transfer Mode (ATM) over MPLS
            Networks", RFC 4717, December 2006.
 [RFC5085]  Nadeau, T., Ed. and C. Pignataro, Ed., "Pseudowire Virtual
            Circuit Connectivity Verification (VCCV): A Control
            Channel for Pseudowires", December 2007.
 [RFC6307]  Black, D., Dunbar, L., Roth, M., and R. Solomon,
            "Encapsulation Methods for Transport of Fibre Channel
            Traffic over MPLS Networks", RFC 6307, April 2012.

Del Regno & Malis Informational [Page 19] RFC 7079 PW/VCCV Implementation Survey Results November 2013

Appendix A. Survey Responses

 The detailed responses are included in this appendix.  The respondent
 contact info has been removed.

A.1. Respondent 1

 2.  In your network in general, across all products, please indicate
     which pseudowire encapsulations your company has implemented.
     Ethernet Tagged Mode - RFC 4448
 3.  Approximately how many pseudowires are deployed of each
     encapsulation type.  Note, this should be the number of
     pseudowires in service, carrying traffic, or pre-positioned to do
     so. ***Note, please indicate "In-Use" for any PW Encap Types
     which you are using but cannot provide a number.
     Ethernet Tagged Mode - RFC 4448 - 423
 4.  Please indicate which VCCV Control Channel is used for each
     encapsulation type.  Understanding that users may have different
     networks with varying implementations, for your network in
     general, please select all which apply.
     Ethernet Tagged Mode - RFC 4448: Control Word (Type 1)
 5.  Please indicate which VCCV Connectivity Verification types are
     used in your networks for each encapsulation type.
     Ethernet Tagged Mode - RFC 4448: LSP Ping
 6.  Please indicate your network's support of and use of the Control
     Word for encapsulations for which the Control Word is optional.
     Supported by Network/Equipment: Ethernet (Tagged Mode), Ethernet
     (Raw Mode)
     Used in Network: Ethernet (Tagged Mode), Ethernet (Raw Mode)
 7.  Please use this space to provide any feedback regarding PW and
     VCCV deployments, VCCV interoperability challenges, this survey
     or any network/vendor details you wish to share.
     No Response

Del Regno & Malis Informational [Page 20] RFC 7079 PW/VCCV Implementation Survey Results November 2013

A.2. Respondent 2

 2.  In your network in general, across all products, please indicate
     which pseudowire encapsulations your company has implemented.
     Ethernet Tagged Mode - RFC 4448
     Ethernet Raw Mode - RFC 4448
     SAToP - RFC 4553
     CESoPSN - RFC 5086
 3.  Approximately how many pseudowires are deployed of each
     encapsulation type.  Note, this should be the number of
     pseudowires in service, carrying traffic, or pre-positioned to do
     so. ***Note, please indicate "In-Use" for any PW Encap Types
     which you are using but cannot provide a number.
     Ethernet Tagged Mode - RFC 4448 - 5000
     Ethernet Raw Mode - RFC 4448 - 1000
     SAToP - RFC 4553 - 50
     CESoPSN - RFC 5086 - 1600
 4.  Please indicate which VCCV Control Channel is used for each
     encapsulation type.  Understanding that users may have different
     networks with varying implementations, for your network in
     general, please select all which apply.
     Ethernet Tagged Mode - RFC 4448: Control Word (Type 1), Router
     Alert Label (Type 2), TTL Expiry (Type 3)
     Ethernet Raw Mode - RFC 4448: Control Word (Type 1), Router Alert
     Label (Type 2), TTL Expiry (Type 3)
     CESoPSN - RFC 5086: TTL Expiry (Type 3)
 5.  Please indicate which VCCV Connectivity Verification types are
     used in your networks for each encapsulation type.
     Ethernet Tagged Mode - RFC 4448: ICMP Ping, LSP Ping
     Ethernet Raw Mode - RFC 4448: ICMP Ping, LSP Ping
     SAToP - RFC 4553: LSP Ping

Del Regno & Malis Informational [Page 21] RFC 7079 PW/VCCV Implementation Survey Results November 2013

     CESoPSN - RFC 5086: LSP Ping
 6.  Please indicate your network's support of and use of the Control
     Word for encapsulations for which the Control Word is optional.
     Supported by Network/Equipment: Ethernet (Tagged Mode), Ethernet
     (Raw Mode)
     Used in Network: No Response
 7.  Please use this space to provide any feedback regarding PW and
     VCCV deployments, VCCV interoperability challenges, this survey
     or any network/vendor details you wish to share.
     I'm very interested in this work as we continue to experience
     interop challenges particularly with newer vendors to the space
     who are only implementing VCCV via control word.  Vendors who
     have tailed their MPLS OAM set specifically to the cell backhaul
     space and mandatory CW have been known to fall into this space.
     That's all I've got.

A.3. Respondent 3

 2.  In your network in general, across all products, please indicate
     which pseudowire encapsulations your company has implemented.
     Ethernet Tagged Mode - RFC 4448
     Ethernet Raw Mode - RFC 4448
     Frame Relay (Port Mode) - RFC 4619
     Frame Relay (1:1 Mode) - RFC 4619
 3.  Approximately how many pseudowires are deployed of each
     encapsulation type.  Note, this should be the number of
     pseudowires in service, carrying traffic, or pre-positioned to do
     so. ***Note, please indicate "In-Use" for any PW Encap Types
     which you are using but cannot provide a number.
     Ethernet Tagged Mode - RFC 4448 - 800
     Ethernet Raw Mode - RFC 4448 - 50
     Frame Relay (Port Mode) - RFC 4619 - 2
     Frame Relay (1:1 Mode) - RFC 4619 - 2

Del Regno & Malis Informational [Page 22] RFC 7079 PW/VCCV Implementation Survey Results November 2013

 4.  Please indicate which VCCV Control Channel is used for each
     encapsulation type.  Understanding that users may have different
     networks with varying implementations, for your network in
     general, please select all which apply.
     No Response
 5.  Please indicate which VCCV Connectivity Verification types are
     used in your networks for each encapsulation type.
     No Response
 6.  Please indicate your network's support of and use of the Control
     Word for encapsulations for which the Control Word is optional.
     Supported by Network/Equipment: Ethernet (Tagged Mode), Ethernet
     (Raw Mode)
     Used in Network: No Response
 7.  Please use this space to provide any feedback regarding PW and
     VCCV deployments, VCCV interoperability challenges, this survey
     or any network/vendor details you wish to share.
     No Response

A.4. Respondent 4

 2.  In your network in general, across all products, please indicate
     which pseudowire encapsulations your company has implemented.
     Ethernet Tagged Mode - RFC 4448
     Ethernet Raw Mode - RFC 4448
 3.  Approximately how many pseudowires are deployed of each
     encapsulation type.  Note, this should be the number of
     pseudowires in service, carrying traffic, or pre-positioned to do
     so. ***Note, please indicate "In-Use" for any PW Encap Types
     which you are using but cannot provide a number.
     Ethernet Tagged Mode - RFC 4448 - 1000
     Ethernet Raw Mode - RFC 4448 - 200

Del Regno & Malis Informational [Page 23] RFC 7079 PW/VCCV Implementation Survey Results November 2013

 4.  Please indicate which VCCV Control Channel is used for each
     encapsulation type.  Understanding that users may have different
     networks with varying implementations, for your network in
     general, please select all which apply.
     No Response
 5.  Please indicate which VCCV Connectivity Verification types are
     used in your networks for each encapsulation type.
     Ethernet Tagged Mode - RFC 4448: LSP Ping
     Ethernet Raw Mode - RFC 4448: LSP Ping
 6.  Please indicate your network's support of and use of the Control
     Word for encapsulations for which the Control Word is optional.
     Supported by Network/Equipment: Ethernet (Tagged Mode), Ethernet
     (Raw Mode)
     Used in Network: No Response
 7.  Please use this space to provide any feedback regarding PW and
     VCCV deployments, VCCV interoperability challenges, this survey
     or any network/vendor details you wish to share.
     EQUIPMENT MANUFACTURER does not provide options to configure VCCV
     control-channel and its sub options for LDP based L2Circuits.
     How can we achieve end-to-end management and fault detection of
     PW without VCCV in such cases?

A.5. Respondent 5

 2.  In your network in general, across all products, please indicate
     which pseudowire encapsulations your company has implemented.
     Ethernet Tagged Mode - RFC 4448
     Ethernet Raw Mode - RFC 4448
     PPP - RFC 4618
     Frame Relay (Port Mode) - RFC 4619
     Frame Relay (1:1 Mode) - RFC 4619
     Fiber Channel (Port Mode) - "Encapsulation Methods for Transport
     of Fibre Channel" (now RFC 6307)

Del Regno & Malis Informational [Page 24] RFC 7079 PW/VCCV Implementation Survey Results November 2013

 3.  Approximately how many pseudowires are deployed of each
     encapsulation type.  Note, this should be the number of
     pseudowires in service, carrying traffic, or pre-positioned to do
     so. ***Note, please indicate "In-Use" for any PW Encap Types
     which you are using but cannot provide a number.
     Ethernet Tagged Mode - RFC 4448 - 4000
 4.  Please indicate which VCCV Control Channel is used for each
     encapsulation type.  Understanding that users may have different
     networks with varying implementations, for your network in
     general, please select all which apply.
     Ethernet Tagged Mode - RFC 4448: Control Word (Type 1), Router
     Alert Label (Type 2)
     Ethernet Raw Mode - RFC 4448: Control Word (Type 1), Router Alert
     Label (Type 2)
 5.  Please indicate which VCCV Connectivity Verification types are
     used in your networks for each encapsulation type.
     Ethernet Tagged Mode - RFC 4448: LSP Ping
 6.  Please indicate your network's support of and use of the Control
     Word for encapsulations for which the Control Word is optional.
     Supported by Network/Equipment: Ethernet (Tagged Mode), Ethernet
     (Raw Mode)
     Used in Network: Ethernet (Tagged Mode), Ethernet (Raw Mode)
 7.  Please use this space to provide any feedback regarding PW and
     VCCV deployments, VCCV interoperability challenges, this survey
     or any network/vendor details you wish to share.
     No Response

A.6. Respondent 6

 2.  In your network in general, across all products, please indicate
     which pseudowire encapsulations your company has implemented.
     Ethernet Tagged Mode - RFC 4448
     Ethernet Raw Mode - RFC 4448

Del Regno & Malis Informational [Page 25] RFC 7079 PW/VCCV Implementation Survey Results November 2013

 3.  Approximately how many pseudowires are deployed of each
     encapsulation type.  Note, this should be the number of
     pseudowires in service, carrying traffic, or pre-positioned to do
     so. ***Note, please indicate "In-Use" for any PW Encap Types
     which you are using but cannot provide a number.
     Ethernet Tagged Mode - RFC 4448 - 1000+
     Ethernet Raw Mode - RFC 4448 - 500
 4.  Please indicate which VCCV Control Channel is used for each
     encapsulation type.  Understanding that users may have different
     networks with varying implementations, for your network in
     general, please select all which apply.
     Ethernet Tagged Mode - RFC 4448: Control Word (Type 1)
     Ethernet Raw Mode - RFC 4448: Control Word (Type 1)
 5.  Please indicate which VCCV Connectivity Verification types are
     used in your networks for each encapsulation type.
     Ethernet Tagged Mode - RFC 4448: ICMP Ping, LSP Ping
     Ethernet Raw Mode - RFC 4448: ICMP Ping, LSP Ping
 6.  Please indicate your network's support of and use of the Control
     Word for encapsulations for which the Control Word is optional.
     Supported by Network/Equipment: Ethernet (Tagged Mode), Ethernet
     (Raw Mode)
     Used in Network: Ethernet (Tagged Mode), Ethernet (Raw Mode)
 7.  Please use this space to provide any feedback regarding PW and
     VCCV deployments, VCCV interoperability challenges, this survey
     or any network/vendor details you wish to share.
     No Response

Del Regno & Malis Informational [Page 26] RFC 7079 PW/VCCV Implementation Survey Results November 2013

A.7. Respondent 7

 2.  In your network in general, across all products, please indicate
     which pseudowire encapsulations your company has implemented.
     Ethernet Raw Mode - RFC 4448
     ATM (1:1 Mode) - RFC 4717
 3.  Approximately how many pseudowires are deployed of each
     encapsulation type.  Note, this should be the number of
     pseudowires in service, carrying traffic, or pre-positioned to do
     so. ***Note, please indicate "In-Use" for any PW Encap Types
     which you are using but cannot provide a number.
     Ethernet Raw Mode - RFC 4448 - 20
     ATM (1:1 Mode) - RFC 4717 - 100
 4.  Please indicate which VCCV Control Channel is used for each
     encapsulation type.  Understanding that users may have different
     networks with varying implementations, for your network in
     general, please select all which apply.
     No Response
 5.  Please indicate which VCCV Connectivity Verification types are
     used in your networks for each encapsulation type.
     Ethernet Raw Mode - RFC 4448: LSP Ping
     ATM (1:1 Mode) - RFC 4717: LSP Ping
 6.  Please indicate your network's support of and use of the Control
     Word for encapsulations for which the Control Word is optional.
     Supported by Network/Equipment: Ethernet (Tagged Mode), Ethernet
     (Raw Mode), PPP, HDLC, Frame Relay (Port Mode), ATM (N:1 Cell
     Mode)
     Used in Network: No Response
 7.  Please use this space to provide any feedback regarding PW and
     VCCV deployments, VCCV interoperability challenges, this survey
     or any network/vendor details you wish to share.

Del Regno & Malis Informational [Page 27] RFC 7079 PW/VCCV Implementation Survey Results November 2013

     We are using L2PVPN AToM like-to-like models - ATMoMPLS - EoMPLS
     ATMoMPLS : This service offered for transporting ATM cells over
     IP/MPLS core with Edge ATM CE devices including BPX, Ericsson
     Media Gateway etc.  This is purely a Port mode with cell-packing
     configuration on it to have best performance.  QoS marking is
     done for getting LLQ treatment in the core for these MPLS
     encapsulated ATM packets.  EoMPLS: This service offered for
     transporting 2G/3G traffic from network such as Node-B to RNC's
     over IP/MPLS backbone core network.  QoS marking is done for
     getting guaranteed bandwidth treatment in the core for these MPLS
     encapsulated ATM packets.  In addition to basic L2VPN service
     configuration, these traffic are routed via MPLS TE tunnels with
     dedicated path and bandwidth defined to avoid bandwidth related
     congestion.

A.8. Respondent 8

 2.  In your network in general, across all products, please indicate
     which pseudowire encapsulations your company has implemented.
     Ethernet Raw Mode - RFC 4448
     ATM (AAL5 SDU Mode) - RFC 4717
     TDMoIP - RFC 5087
 3.  Approximately how many pseudowires are deployed of each
     encapsulation type.  Note, this should be the number of
     pseudowires in service, carrying traffic, or pre-positioned to do
     so. ***Note, please indicate "In-Use" for any PW Encap Types
     which you are using but cannot provide a number.
     Ethernet Raw Mode - RFC 4448 - In-Use
     ATM (AAL5 SDU Mode) - RFC 4717 - In-Use
     TDMoIP - RFC 5087 - In-Use
 4.  Please indicate which VCCV Control Channel is used for each
     encapsulation type.  Understanding that users may have different
     networks with varying implementations, for your network in
     general, please select all which apply.
     Ethernet Raw Mode - RFC 4448: Control Word (Type 1)
     ATM (AAL5 SDU Mode) - RFC 4717: Router Alert Label (Type 2)

Del Regno & Malis Informational [Page 28] RFC 7079 PW/VCCV Implementation Survey Results November 2013

 5.  Please indicate which VCCV Connectivity Verification types are
     used in your networks for each encapsulation type.
     Ethernet Raw Mode - RFC 4448: LSP Ping
     ATM (AAL5 SDU Mode) - RFC 4717: LSP Ping
     TDMoIP - RFC 5087: LSP Ping
 6.  Please indicate your network's support of and use of the Control
     Word for encapsulations for which the Control Word is optional.
     Supported by Network/Equipment: Ethernet (Raw Mode), ATM (N:1
     Cell Mode)
     Used in Network: Ethernet (Raw Mode), ATM (N:1 Cell Mode)
 7.  Please use this space to provide any feedback regarding PW and
     VCCV deployments, VCCV interoperability challenges, this survey
     or any network/vendor details you wish to share.
     PW VCCV is very useful tool for finding faults in each PW
     channel.  Without this we can not find fault on a PW channel.  PW
     VCCV using BFD is another better option.  Interoperability
     challenges are with Ethernet OAM mechanism.

A.9. Respondent 9

 2.  In your network in general, across all products, please indicate
     which pseudowire encapsulations your company has implemented.
     Ethernet Tagged Mode - RFC 4448
     Frame Relay (1:1 Mode) - RFC 4619
 3.  Approximately how many pseudowires are deployed of each
     encapsulation type.  Note, this should be the number of
     pseudowires in service, carrying traffic, or pre-positioned to do
     so. ***Note, please indicate "In-Use" for any PW Encap Types
     which you are using but cannot provide a number.
     Ethernet Tagged Mode - RFC 4448 - 19385
     Frame Relay (1:1 Mode) - RFC 4619 - 15757

Del Regno & Malis Informational [Page 29] RFC 7079 PW/VCCV Implementation Survey Results November 2013

 4.  Please indicate which VCCV Control Channel is used for each
     encapsulation type.  Understanding that users may have different
     networks with varying implementations, for your network in
     general, please select all which apply.
     Frame Relay (1:1 Mode) - RFC 4619: Control Word (Type 1)
 5.  Please indicate which VCCV Connectivity Verification types are
     used in your networks for each encapsulation type.
     Frame Relay (1:1 Mode) - RFC 4619: LSP Ping
 6.  Please indicate your network's support of and use of the Control
     Word for encapsulations for which the Control Word is optional.
     Supported by Network/Equipment: Ethernet (Tagged Mode), Ethernet
     (Raw Mode), PPP, HDLC, Frame Relay (Port Mode), ATM (N:1 Cell
     Mode)
     Used in Network: No Response
 7.  Please use this space to provide any feedback regarding PW and
     VCCV deployments, VCCV interoperability challenges, this survey
     or any network/vendor details you wish to share.
     No Response

A.10. Respondent 10

 2.  In your network in general, across all products, please indicate
     which pseudowire encapsulations your company has implemented.
     Ethernet Raw Mode - RFC 4448
 3.  Approximately how many pseudowires are deployed of each
     encapsulation type.  Note, this should be the number of
     pseudowires in service, carrying traffic, or pre-positioned to do
     so. ***Note, please indicate "In-Use" for any PW Encap Types
     which you are using but cannot provide a number.
     Ethernet Raw Mode - RFC 4448 - 325
 4.  Please indicate which VCCV Control Channel is used for each
     encapsulation type.  Understanding that users may have different
     networks with varying implementations, for your network in
     general, please select all which apply.
     Ethernet Raw Mode - RFC 4448: Control Word (Type 1)

Del Regno & Malis Informational [Page 30] RFC 7079 PW/VCCV Implementation Survey Results November 2013

 5.  Please indicate which VCCV Connectivity Verification types are
     used in your networks for each encapsulation type.
     Ethernet Raw Mode - RFC 4448: ICMP Ping, LSP Ping
 6.  Please indicate your network's support of and use of the Control
     Word for encapsulations for which the Control Word is optional.
     Supported by Network/Equipment: No Response
     Used in Network: No Response
 7.  Please use this space to provide any feedback regarding PW and
     VCCV deployments, VCCV interoperability challenges, this survey
     or any network/vendor details you wish to share.
     No Response

A.11. Respondent 11

 2.  In your network in general, across all products, please indicate
     which pseudowire encapsulations your company has implemented.
     Ethernet Tagged Mode - RFC 4448
     Ethernet Raw Mode - RFC 4448
     PPP - RFC 4618 HDLC - RFC 4618
     Frame Relay (1:1 Mode) - RFC 4619
 3.  Approximately how many pseudowires are deployed of each
     encapsulation type.  Note, this should be the number of
     pseudowires in service, carrying traffic, or pre-positioned to do
     so. ***Note, please indicate "In-Use" for any PW Encap Types
     which you are using but cannot provide a number.
     Ethernet Tagged Mode - RFC 4448 - 2000
     Ethernet Raw Mode - RFC 4448 - 100
     PPP - RFC 4618 - 500
     Frame Relay (1:1 Mode) - RFC 4619 - 200

Del Regno & Malis Informational [Page 31] RFC 7079 PW/VCCV Implementation Survey Results November 2013

 4.  Please indicate which VCCV Control Channel is used for each
     encapsulation type.  Understanding that users may have different
     networks with varying implementations, for your network in
     general, please select all which apply.
     No Response
 5.  Please indicate which VCCV Connectivity Verification types are
     used in your networks for each encapsulation type.
     Ethernet Tagged Mode - RFC 4448: ICMP Ping, LSP Ping
     Ethernet Raw Mode - RFC 4448: ICMP Ping, LSP Ping
     Frame Relay (1:1 Mode) - RFC 4619: ICMP Ping, LSP Ping
 6.  Please indicate your network's support of and use of the Control
     Word for encapsulations for which the Control Word is optional.
     Supported by Network/Equipment: Ethernet (Tagged Mode), Ethernet
     (Raw Mode), PPP, HDLC
     Used in Network: Ethernet (Tagged Mode)
 7.  Please use this space to provide any feedback regarding PW and
     VCCV deployments, VCCV interoperability challenges, this survey
     or any network/vendor details you wish to share.
     No Response

A.12. Respondent 12

 2.  In your network in general, across all products, please indicate
     which pseudowire encapsulations your company has implemented.
     Ethernet Raw Mode - RFC 4448
 3.  Approximately how many pseudowires are deployed of each
     encapsulation type.  Note, this should be the number of
     pseudowires in service, carrying traffic, or pre-positioned to do
     so. ***Note, please indicate "In-Use" for any PW Encap Types
     which you are using but cannot provide a number.
     Ethernet Raw Mode - RFC 4448 - 50000

Del Regno & Malis Informational [Page 32] RFC 7079 PW/VCCV Implementation Survey Results November 2013

 4.  Please indicate which VCCV Control Channel is used for each
     encapsulation type.  Understanding that users may have different
     networks with varying implementations, for your network in
     general, please select all which apply.
     Ethernet Raw Mode - RFC 4448: Control Word (Type 1), Router Alert
     Label (Type 2), TTL Expiry (Type 3)
 5.  Please indicate which VCCV Connectivity Verification types are
     used in your networks for each encapsulation type.
     No Response
 6.  Please indicate your network's support of and use of the Control
     Word for encapsulations for which the Control Word is optional.
     Supported by Network/Equipment: Ethernet (Tagged Mode), Ethernet
     (Raw Mode)
     Used in Network: Ethernet (Tagged Mode), Ethernet (Raw Mode)
 7.  Please use this space to provide any feedback regarding PW and
     VCCV deployments, VCCV interoperability challenges, this survey
     or any network/vendor details you wish to share.
     No Response

A.13. Respondent 13

 2.  In your network in general, across all products, please indicate
     which pseudowire encapsulations your company has implemented.
     Ethernet Tagged Mode - RFC 4448
     Ethernet Raw Mode - RFC 4448
     Frame Relay (1:1 Mode) - RFC 4619
 3.  Approximately how many pseudowires are deployed of each
     encapsulation type.  Note, this should be the number of
     pseudowires in service, carrying traffic, or pre-positioned to do
     so. ***Note, please indicate "In-Use" for any PW Encap Types
     which you are using but cannot provide a number.
     Ethernet Tagged Mode - RFC 4448 - 3
     Ethernet Raw Mode - RFC 4448 - 10-20

Del Regno & Malis Informational [Page 33] RFC 7079 PW/VCCV Implementation Survey Results November 2013

     ATM (1:1 Mode) - RFC 4717 - 3
 4.  Please indicate which VCCV Control Channel is used for each
     encapsulation type.  Understanding that users may have different
     networks with varying implementations, for your network in
     general, please select all which apply.
     Ethernet Tagged Mode - RFC 4448: Control Word (Type 1), TTL
     Expiry (Type 3)
     Ethernet Raw Mode - RFC 4448: Control Word (Type 1), TTL Expiry
     (Type 3)
     Frame Relay (1:1 Mode) - RFC 4619: Control Word (Type 1), TTL
     Expiry (Type 3)
 5.  Please indicate which VCCV Connectivity Verification types are
     used in your networks for each encapsulation type.
     Ethernet Tagged Mode - RFC 4448: ICMP Ping, LSP Ping
     Ethernet Raw Mode - RFC 4448: ICMP Ping, LSP Ping
     Frame Relay (1:1 Mode) - RFC 4619: ICMP Ping, LSP Ping
 6.  Please indicate your network's support of and use of the Control
     Word for encapsulations for which the Control Word is optional.
     Supported by Network/Equipment: Ethernet (Tagged Mode), Ethernet
     (Raw Mode), PPP, HDLC, Frame Relay (Port Mode), ATM (N:1 Cell
     Mode)
     Used in Network: Ethernet (Tagged Mode), Ethernet (Raw Mode),
     Frame Relay (Port Mode)
 7.  Please use this space to provide any feedback regarding PW and
     VCCV deployments, VCCV interoperability challenges, this survey
     or any network/vendor details you wish to share.
     No Response

Del Regno & Malis Informational [Page 34] RFC 7079 PW/VCCV Implementation Survey Results November 2013

A.14. Respondent 14

 2.  In your network in general, across all products, please indicate
     which pseudowire encapsulations your company has implemented.
     Ethernet Tagged Mode - RFC 4448
     Ethernet Raw Mode - RFC 4448
 3.  Approximately how many pseudowires are deployed of each
     encapsulation type.  Note, this should be the number of
     pseudowires in service, carrying traffic, or pre-positioned to do
     so. ***Note, please indicate "In-Use" for any PW Encap Types
     which you are using but cannot provide a number.
     Ethernet Tagged Mode - RFC 4448 - 150
     Ethernet Raw Mode - RFC 4448 - 100
 4.  Please indicate which VCCV Control Channel is used for each
     encapsulation type.  Understanding that users may have different
     networks with varying implementations, for your network in
     general, please select all which apply.
     Ethernet Tagged Mode - RFC 4448: Control Word (Type 1), Router
     Alert Label (Type 2)
     Ethernet Raw Mode - RFC 4448: Control Word (Type 1), Router Alert
     Label (Type 2)
 5.  Please indicate which VCCV Connectivity Verification types are
     used in your networks for each encapsulation type.
     Ethernet Tagged Mode - RFC 4448: LSP Ping
     Ethernet Raw Mode - RFC 4448: LSP Ping
 6.  Please indicate your network's support of and use of the Control
     Word for encapsulations for which the Control Word is optional.
     Supported by Network/Equipment: Ethernet (Tagged Mode), Ethernet
     (Raw Mode), PPP, HDLC, Frame Relay (Port Mode)
     Used in Network: Ethernet (Tagged Mode), Ethernet (Raw Mode)

Del Regno & Malis Informational [Page 35] RFC 7079 PW/VCCV Implementation Survey Results November 2013

 7.  Please use this space to provide any feedback regarding PW and
     VCCV deployments, VCCV interoperability challenges, this survey
     or any network/vendor details you wish to share.
     No Response

A.15. Respondent 15

 2.  In your network in general, across all products, please indicate
     which pseudowire encapsulations your company has implemented.
     Ethernet Tagged Mode - RFC 4448
     Ethernet Raw Mode - RFC 4448
     Frame Relay (1:1 Mode) - RFC 4619
     ATM (1:1 Mode) - RFC 4717
 3.  Approximately how many pseudowires are deployed of each
     encapsulation type.  Note, this should be the number of
     pseudowires in service, carrying traffic, or pre-positioned to do
     so. ***Note, please indicate "In-Use" for any PW Encap Types
     which you are using but cannot provide a number.
     Ethernet Tagged Mode - RFC 4448 - 20,000
     Ethernet Raw Mode - RFC 4448 - 1000
     Frame Relay (1:1 Mode) - RFC 4619 - 30,000
     ATM (1:1 Mode) - RFC 4717 - 20,000
 4.  Please indicate which VCCV Control Channel is used for each
     encapsulation type.  Understanding that users may have different
     networks with varying implementations, for your network in
     general, please select all which apply.
     Ethernet Tagged Mode - RFC 4448: TTL Expiry (Type 3)
     Ethernet Raw Mode - RFC 4448: TTL Expiry (Type 3)
     Frame Relay (1:1 Mode) - RFC 4619: TTL Expiry (Type 3)
     ATM (1:1 Mode) - RFC 4717: TTL Expiry (Type 3)

Del Regno & Malis Informational [Page 36] RFC 7079 PW/VCCV Implementation Survey Results November 2013

 5.  Please indicate which VCCV Connectivity Verification types are
     used in your networks for each encapsulation type.
     Ethernet Tagged Mode - RFC 4448: LSP Ping
     Ethernet Raw Mode - RFC 4448: LSP Ping
     Frame Relay (1:1 Mode) - RFC 4619: LSP Ping
     ATM (1:1 Mode) - RFC 4717: LSP Ping
 6.  Please indicate your network's support of and use of the Control
     Word for encapsulations for which the Control Word is optional.
     Supported by Network/Equipment: No Response
     Used in Network: No Response
 7.  Please use this space to provide any feedback regarding PW and
     VCCV deployments, VCCV interoperability challenges, this survey
     or any network/vendor details you wish to share.
     COMPANY has deployed several MPLS network elements, from multiple
     vendors.  COMPANY is seeking a uniform implementation of VCCV
     Control Channel (CC) capabilities across its various vendor
     platforms.  This will provide COMPANY with significant advantages
     in reduced operational overheads when handling cross-domain
     faults.  Having a uniform VCCV feature implementation in COMPANY
     multi-vendor network leads to:
     o   Reduced operational cost and complexity
     o   Reduced OSS development to coordinate incompatible VCCV
         implementations.
     o   Increased end-end service availability when handing faults.
     In addition, currently some of COMPANY deployed VCCV traffic
     flows (on some vendor platforms) are not guaranteed to follow
     those of the customer's application traffic (a key operational
     requirement).  As a result, the response from the circuit ping
     cannot faithfully reflect the status of the circuit.  This leads
     to ambiguity regarding the operational status of our networks.
     An in-band method is highly preferred, with COMPANY having a
     clear preference for VCCV Circuit Ping using PWE Control Word.
     This preference is being pursued with each of COMPANY vendors.

Del Regno & Malis Informational [Page 37] RFC 7079 PW/VCCV Implementation Survey Results November 2013

A.16. Respondent 16

 2.  In your network in general, across all products, please indicate
     which pseudowire encapsulations your company has implemented.
     Ethernet Tagged Mode - RFC 4448
     Ethernet Raw Mode - RFC 4448
 3.  Approximately how many pseudowires are deployed of each
     encapsulation type.  Note, this should be the number of
     pseudowires in service, carrying traffic, or pre-positioned to do
     so. ***Note, please indicate "In-Use" for any PW Encap Types
     which you are using but cannot provide a number.
     Ethernet Tagged Mode - RFC 4448 - 100
     Ethernet Raw Mode - RFC 4448 - 100
 4.  Please indicate which VCCV Control Channel is used for each
     encapsulation type.  Understanding that users may have different
     networks with varying implementations, for your network in
     general, please select all which apply.
     No Response
 5.  Please indicate which VCCV Connectivity Verification types are
     used in your networks for each encapsulation type.
     Ethernet Tagged Mode - RFC 4448: ICMP Ping, LSP Ping
     Ethernet Raw Mode - RFC 4448: ICMP Ping, LSP Ping
 6.  Please indicate your network's support of and use of the Control
     Word for encapsulations for which the Control Word is optional.
     Supported by Network/Equipment: Ethernet (Tagged Mode), Ethernet
     (Raw Mode)
     Used in Network: No Response
 7.  Please use this space to provide any feedback regarding PW and
     VCCV deployments, VCCV interoperability challenges, this survey
     or any network/vendor details you wish to share.

Del Regno & Malis Informational [Page 38] RFC 7079 PW/VCCV Implementation Survey Results November 2013

     Using CV is not required at the moment

A.17. Respondent 17

 2.  In your network in general, across all products, please indicate
     which pseudowire encapsulations your company has implemented.
     Ethernet Tagged Mode - RFC 4448
     SAToP - RFC 4553
     Frame Relay (Port Mode) - RFC 4619
     Frame Relay (1:1 Mode) - RFC 4619
     ATM (N:1 Mode) - RFC 4717
     ATM (1:1 Mode) - RFC 4717
     CESoPSN - RFC 5086
     TDMoIP - RFC 5087
 3.  Approximately how many pseudowires are deployed of each
     encapsulation type.  Note, this should be the number of
     pseudowires in service, carrying traffic, or pre-positioned to do
     so. ***Note, please indicate "In-Use" for any PW Encap Types
     which you are using but cannot provide a number.
     Ethernet Tagged Mode - RFC 4448 - >40k
     Ethernet Raw Mode - RFC 4448 - In-Use
     SAToP - RFC 4553 - >20k
     Frame Relay (Port Mode) - RFC 4619 - >5k
     Frame Relay (1:1 Mode) - RFC 4619 - >5k
     ATM (N:1 Mode) - RFC 4717 - >50k
     ATM (1:1 Mode) - RFC 4717 - >50k
     CESoPSN - RFC 5086 - >20k
     TDMoIP - RFC 5087 - >20k

Del Regno & Malis Informational [Page 39] RFC 7079 PW/VCCV Implementation Survey Results November 2013

 4.  Please indicate which VCCV Control Channel is used for each
     encapsulation type.  Understanding that users may have different
     networks with varying implementations, for your network in
     general, please select all which apply.
     Ethernet Tagged Mode - RFC 4448: Control Word (Type 1)
     SAToP - RFC 4553: Control Word (Type 1)
     Frame Relay (Port Mode) - RFC 4619: Control Word (Type 1)
     Frame Relay (1:1 Mode) - RFC 4619: Control Word (Type 1)
     ATM (N:1 Mode) - RFC 4717: Control Word (Type 1)
     ATM (1:1 Mode) - RFC 4717: Control Word (Type 1)
 5.  Please indicate which VCCV Connectivity Verification types are
     used in your networks for each encapsulation type.
     Ethernet Tagged Mode - RFC 4448: LSP Ping
     SAToP - RFC 4553: LSP Ping
     Frame Relay (Port Mode) - RFC 4619: LSP Ping
     Frame Relay (1:1 Mode) - RFC 4619: LSP Ping
     ATM (N:1 Mode) - RFC 4717: LSP Ping
     ATM (1:1 Mode) - RFC 4717: LSP Ping
 6.  Please indicate your network's support of and use of the Control
     Word for encapsulations for which the Control Word is optional.
     Supported by Network/Equipment: ATM (N:1 Cell Mode)
     Used in Network: No Response
 7.  Please use this space to provide any feedback regarding PW and
     VCCV deployments, VCCV interoperability challenges, this survey
     or any network/vendor details you wish to share.
     BFD VCCV Control Channel is not indicated in the survey (may be
     required for PW redundancy purpose)

Del Regno & Malis Informational [Page 40] RFC 7079 PW/VCCV Implementation Survey Results November 2013

Authors' Addresses

 Christopher N. "Nick" Del Regno (editor)
 Verizon Communications, Inc.
 400 International Pkwy
 Richardson, TX  75081
 US
 EMail: nick.delregno@verizon.com
 Andrew G. Malis (editor)
 Consultant
 EMail: agmalis@gmail.com

Del Regno & Malis Informational [Page 41]

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