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Versions: 00 01 02 03 RFC 7079

Network Working Group                                  N. Del Regno, Ed.
Internet-Draft                                Verizon Communications Inc
Intended status: Informational                            April 17, 2012
Expires: October 19, 2012


 The Pseudowire (PW) & Virtual Circuit Connectivity Verification (VCCV)
                     Implementation Survey Results
              draft-ietf-pwe3-vccv-impl-survey-results-00

Abstract

   Most Pseudowire Emulation Edge-to-Edge (PWE3) encapsulations mandate
   the use of the Control Word (CW) in order to better emulate the
   services for which the encapsulations have been defined.  However,
   some encapulations 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 drafts to attempt to remedy the situation.  This
   survey of the PW/VCCV user community was conducted to determine
   implementation trends.  The survey and results is presented herein.

Status of this Memo

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   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on October 19, 2012.

Copyright Notice

   Copyright (c) 2012 IETF Trust and the persons identified as the
   document authors.  All rights reserved.




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   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
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   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.


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 . . . . . . . . . . . . . . . . . . . . . . . .  7
     2.1.  Respondents  . . . . . . . . . . . . . . . . . . . . . . .  7
     2.2.  Pseudowire Encapsulations Implemented  . . . . . . . . . .  8
     2.3.  Number of Pseudowires Deployed . . . . . . . . . . . . . .  8
     2.4.  VCCV Control Channel In Use  . . . . . . . . . . . . . . .  9
     2.5.  VCCV Connectivity Verification Types In Use  . . . . . . . 12
     2.6.  Control Word Support for Encaps for which CW is
           Optional . . . . . . . . . . . . . . . . . . . . . . . . . 14
     2.7.  Open Ended Question  . . . . . . . . . . . . . . . . . . . 15
   3.  Security Considerations  . . . . . . . . . . . . . . . . . . . 16
   4.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 17
   5.  Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 17
   6.  Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
     6.1.  Respondent 1 . . . . . . . . . . . . . . . . . . . . . . . 17
     6.2.  Respondent 2 . . . . . . . . . . . . . . . . . . . . . . . 18
     6.3.  Respondent 3 . . . . . . . . . . . . . . . . . . . . . . . 19
     6.4.  Respondent 4 . . . . . . . . . . . . . . . . . . . . . . . 20
     6.5.  Respondent 5 . . . . . . . . . . . . . . . . . . . . . . . 21
     6.6.  Respondent 6 . . . . . . . . . . . . . . . . . . . . . . . 22
     6.7.  Respondent 7 . . . . . . . . . . . . . . . . . . . . . . . 23
     6.8.  Respondent 8 . . . . . . . . . . . . . . . . . . . . . . . 25
     6.9.  Respondent 9 . . . . . . . . . . . . . . . . . . . . . . . 26
     6.10. Respondent 10  . . . . . . . . . . . . . . . . . . . . . . 27
     6.11. Respondent 11  . . . . . . . . . . . . . . . . . . . . . . 28
     6.12. Respondent 12  . . . . . . . . . . . . . . . . . . . . . . 29
     6.13. Respondent 13  . . . . . . . . . . . . . . . . . . . . . . 30
     6.14. Respondent 14  . . . . . . . . . . . . . . . . . . . . . . 31
     6.15. Respondent 15  . . . . . . . . . . . . . . . . . . . . . . 32
     6.16. Respondent 16  . . . . . . . . . . . . . . . . . . . . . . 34
     6.17. Respondent 17  . . . . . . . . . . . . . . . . . . . . . . 35
   7.  Informative References . . . . . . . . . . . . . . . . . . . . 37



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   Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 37


















































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1.  Introduction

   The IETF has defined many encapsulations of various layer 1 and layer
   2 service-specific PDUs and circuit data.  Within these
   encapsulations, there are often several modes of encapsulation which
   have differing requirements in order to fully emulate the service.
   As such, the use of the PWE3 Control Word is mandated in many of the
   encapsulations, but not all.  This can present interoperability
   issues related to A) Control Word use and B) VCCV Control Channel
   negotiation in mixed implementation environments.

   The encapsulations and modes for which the Control Word is currently
   optional are:

   o  Ethernet Tagged Mode

   o  Ethernet Raw Mode

   o  PPP

   o  HDLC

   o  Frame Relay Port Mode

   o  ATM (N:1 Cell Mode)

   [RFC5085] defines three Control Channel types for MPLS PW's: Type 1,
   using the Pseudowire Control Word, Type 2, using the Router Alert
   Label, and Type 3, using 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 control word 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
   permuations, interoperability challenges have been identified by
   several VCCV users.

   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 and the
   information returned by the user community who participated.






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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 Pseudowires, 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 URL for the
   survey (now closed) was http://www.surveymonkey.com/pwe3/.  The
   survey ran from November 4, 2010 until February 25, 2011.

1.2.  PW/VCCV Survey Form

   The PW/VCCV Implementation Survey requested the following information
   about user implementations:

   - Responding Organziation.  No provisions were made for anonymity.
   All responses required a valid email address in order to validate the
   survey response.

   - Of the various encapsulations (and options therein) known at the
   time, including the WG draft for Fiber Channel), which were
   implemented b the respondent.  These included:

   o  Ethernet Tagged Mode - RFC 4448

   o  Ethernet Raw Mode - RFC 4448

   o  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 SDU Mode) - RFC 4717

   o  ATM (AAL5 PDU Mode) - RFC 4717

   o  CEP - RFC 4842




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   o  CESoPSN - RFC 5086

   o  TDMoIP - RFC 5087

   o  Fiber Channel (Port Mode) - draft-ietf-pwe3-fc-encap

   - Approximately how many Pseudowires of each type were deployed.
   Respondents could list a number, or for the sake of privacy, could
   just respond "In-Use" instead.

   - For each encapsulation listed above, the respondent could indicated
   which Control Channel was in use.  The options listed were:

   o  Control Word (Type 1)

   o  Router Alert Label (Type 2)

   o  TTL Expiry (Type 3)

   - For each encapsulation listed above, the respondent could indicate
   which Connectivity Verification types were in use.  The options were:

   o  ICMP Ping

   o  LSP Ping

   - For each encapsulation type for which the use of the Control Word
   is optional, the respondents could indicated the encaps for which
   Control Word was supported by the equipment used and whether it was
   in use in the network.  The encaps 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)

   - Finally, a freeform entry was provided for the respondent to
   provide feedback regarding PW and VCCV deployments, VCCV
   interoperability challenges, the survey or any network/vendor details
   they wished to share.




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1.3.  PW/VCCV Survey Highlights

   There were 17 valid responses to the survey.  The responding
   companies are listed below in Section 2.1.


2.  Survey Results

2.1.  Respondents

   The following companies participated in the PW/VCCV Implementation
   Survey.  The data provided has been aggregated.  No specific
   company's reponse will be detailed herein.

   o  Time Warner Cable

   o  Bright House Networks

   o  Tinet

   o  AboveNet

   o  Telecom New Zealand

   o  Cox Communications

   o  MTN South Africa

   o  Wipro Technologies

   o  Verizon

   o  AMS-IX

   o  Superonline

   o  Deutsche Telekom AG

   o  Internet Solution

   o  Easynet Global Services

   o  Telstra Corporation

   o  OJSC MegaFon

   o  France Telecom Orange




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2.2.  Pseudowire Encapsulations Implemented

   The following question was asked: "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) - draft-ietf-pwe3-fc-encap = 5.9%

2.3.  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 psudowires in use
   for each encapsulation:

   o  Ethernet Tagged Mode = 93,861





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   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) - draft-ietf-pwe3-fc-encap = 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.

   Additionally, the following encaps 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

2.4.  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



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   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

   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




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      *  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

   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




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      *  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) - draft-ietf-pwe3-fc-encap

      *  Control Word (Type 1) = 0

      *  Router Alert Label (Type 2) = 0

      *  TTL Expiry (Type 3) = 0

2.5.  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 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





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      *  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

   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






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   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) - draft-ietf-pwe3-fc-encap

      *  ICMP Ping = 0

      *  LSP Ping = 0

2.6.  Control Word Support for Encaps 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




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   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

2.7.  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.

   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



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       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.  Introperbility
       challences are with Ethernet OAM mechanism.

   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 a report of the PW/VCCV User Implementation
   Survey results, no security considerations are introduced.





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4.  IANA Considerations

   This document has no actions for IANA.


5.  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 2.1. who took the time and
   effort to participate.


6.  Appendix

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

6.1.  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.




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   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

6.2.  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)



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   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

   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.

6.3.  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



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   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

   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

6.4.  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,



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   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

   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?

6.5.  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



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   Frame Relay (Port Mode) - RFC 4619

   Frame Relay (1:1 Mode) - RFC 4619

   Fiber Channel (Port Mode) - draft-ietf-pwe3-fc-encap

   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

6.6.  Respondent 6

   2.  In your network in general, across all products, please indicate
   which Pseudowire encapsulations your company has implemented.



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   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 - 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

6.7.  Respondent 7

   2.  In your network in general, across all products, please indicate
   which Pseudowire encapsulations your company has implemented.



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   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.

   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



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   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.

6.8.  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)

   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



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   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.  Introperbility challences are with
   Ethernet OAM mechanism.

6.9.  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

   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



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   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

6.10.  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)

   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



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   VCCV deployments, VCCV interoperability challenges, this survey or
   any network/vendor details you wish to share.

   No Response

6.11.  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

   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




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   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

6.12.  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

   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)




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   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

6.13.  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

   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.




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   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

6.14.  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)




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   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)

   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

6.15.  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



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   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)

   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



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   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.

6.16.  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 Resposne



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   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.

   Using CV is not required at the moment

6.17.  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



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   TDMoIP - RFC 5087 - >20k

   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)




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7.  Informative References

   [RFC5085]  Nadeau, T., Ed. and C. Pignataro, Ed., "Pseudowire Virtual
              Circuit Connectivity Verification (VCCV): A Control
              Channel for Pseudowires", December 2007.


Author's Address

   Christopher N. "Nick" Del Regno (editor)
   Verizon Communications Inc
   400 International Pkwy
   Richardson, TX  75081
   US

   Email: nick.delregno@verizon.com



































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