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Versions: 00 01 draft-ietf-ccamp-gmpls-alarm-spec

Network Working Group               Lou Berger - Editor (Movaz Networks)
Internet Draft
Expiration Date: April 2004

                                                            October 2003


               GMPLS - Communication of Alarm Information


               draft-berger-ccamp-gmpls-alarm-spec-00.txt

Status of this Memo

   This document is an Internet-Draft and is in full conformance with
   all provisions of Section 10 of RFC2026.  Internet-Drafts are working
   documents of the Internet Engineering Task Force (IETF), its areas,
   and its working groups.  Note that other groups may also distribute
   working documents as Internet-Drafts.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   To view the current status of any Internet-Draft, please check the
   "1id-abstracts.txt" listing contained in an Internet-Drafts Shadow
   Directory, see http://www.ietf.org/shadow.html.

Abstract

   This document describes an extension to Generalized MPLS (Multi-
   Protocol Label Switching) signaling to support communication of alarm
   information.  GMPLS signaling already supports the control of alarm
   reporting, but not the communication of alarm information.  This
   document presents both a functional description and GMPLS-RSVP
   specifics of such an extension.  This document also proposes
   modification of the RSVP ERROR_SPEC object.

Open Issues

   o ITU reference for alarm values
     We'd like to use values defined by ITU, but are having difficulty
     identifying an appropriate reference.  Once such is identified,
     Section 3.1.3 can be updated to describe this.











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1. Introduction

   GMPLS Signaling provides mechanisms that can be used to control the
   reporting of alarms associated with an LSP.  This support is provided
   via Administrative Status Information [RFC3471] and the Admin_Status
   object [RFC3473].  These mechanisms only control if alarm reporting
   is inhibited.  No provision is made for communication of alarm
   information.

   The extension described in this document defines how the alarm
   information associated with a GMPLS label-switched path (LSP) may be
   communicated along the path of the LSP.  Communication both upstream
   and downstream is supported.  The value in communicating such alarm
   information is that this information is then available at every node
   along the LSP for display and diagnostic purposes.  Alarm information
   may also be useful in certain traffic protection scenarios, but such
   uses are out of scope of this document.  Alarm communication is
   supported via a new object, new error/alarm information TLVs, and a
   new Administrative Status Information bit.

   The communication of alarms, as described in this document, are
   controllable on a per LSP basis.  Such communication may be useful
   within network configurations where not all nodes support
   communication to a user for reporting of alarms and/or communication
   is needed to support specific applications.  The support of this
   functionality is optional.

   The communication of alarms within GMPLS does not imply any
   modification in behavior of processing of alarms, or for the
   communication of alarms outside of GMPLS.

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119].


1.1. Background

   Problems with data plane state can often be detected by associated
   data plane hardware components.  Such data plane problems are
   typically filtered based on elapsed time and local policy.  Problems
   that pass the filtering process are normally raised as alarms.  These
   alarms are available for display to operators.  They also may be
   collected centrally through means that are out of the scope of this
   document.

   Not all data plane problems cause the LSP to be immediately torn down
   based on an error reported in a PathErr or ResvErr message.  Further,



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   there may be a desire, particularly in optical transport networks, to
   retain an LSP and communicate relevant alarm information even when
   the data plane state has failed completely.

   Although error information can be reported using PathErr, ResvErr and
   Notify messages, these messages typically indicate a problem in
   signaling state and can only report one problem at at a time.  This
   makes it hard to correlate all of the problems with a single LSP and
   to allow an operator examining the status of an LSP to view a full
   list of current problems.  This situation is exacerbated by the
   absence of any way to communicate that a problem has been resolved
   and a corresponding alarm cleared.

   The extensions defined in this document allow an operator or a
   software component to obtain a full list of current alarms associated
   with all of the resources associated with an LSP.  The extensions
   also ensure that this list is kept up-to-date and synchronized with
   the real alarm status in the network.  Finally, the extensions make
   the list available at every LSR traversed by an LSP.


2. Alarm Information Communication

   A new object is introduced to carry alarm information details.  The
   details of alarm information are much like the error information
   carried in the existing ERROR_SPEC objects.  For this reason the
   communication of alarm information uses a format that is based on the
   communication of error information.

   The new object introduced to carry alarm information details is
   called an ALARM_SPEC object.  This object has the same format as the
   ERROR_SPEC object, but uses a new C-Num to avoid the semantics of
   error processing.  Also, additional TLVs are defined for the IF_ID
   ALARM_SPEC objects to support the communication of information
   related to a specific alarm.  These TLVs may also be useful when
   included in ERROR_SPEC objects, e.g., when the ERROR_SPEC object is
   carried in a Notify message.

   While the details of alarm information are like the details of
   existing error communication, the semantics of processing each
   differ.  Alarm information will typically relate to changes in data
   plane state, without changes in in control state.  Alarm information
   will always be associated with in-place LSPs.  Such information will
   also typically be most useful to operators and applications other
   than for control plane protocol processing.  Finally, while error
   information is communicated within PathErr, ResvErr and Notify
   messages [RFC3473], alarm information will be carried within Path and
   Resv messages.



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   Path messages are used to carry alarm information to downstream
   nodes, and Resv messages are used to carry alarm information to
   upstream nodes.  The intent of sending alarm information both
   upstream and downstream is to provide the same visibility to alarm
   information at any point along an LSP.  The communication of multiple
   alarms associated with an LSP is supported.  In this case, multiple
   ALARM_SPEC objects will be carried in the Path or Resv messages.

   The addition of alarm information to Path and Resv messages is
   controlled via a new Administrative Status Information bit.
   Administrative Status Information is carried in the Admin_Status
   object.



3. GMPLS-RSVP Details

   This section provides the GMPLS-RSVP [RFC3473] specification for
   communication of alarm information.  The communication of alarm
   information is optional.  This section applies to nodes that support
   communication of alarm information.


3.1. ALARM_SPEC Objects

   The ALARM_SPEC objects use the same format as the ERROR_SPEC object,
   but with class number of TBA (to be assigned by IANA in the form
   11bbbbbb).

   o   IPv4 ALARM_SPEC object: Class = TBA, C-Type = 1
       Definition same as IPv4 ERROR_SPEC [RFC2205].

   o   IPv6 ALARM_SPEC object: Class = TBA, C-Type = 2
       Definition same as IPv6 ERROR_SPEC [RFC2205].

   o   IPv4 IF_ID ALARM_SPEC object: Class = TBA, C-Type = 3
       Definition same as IPv4 IF_ID ERROR_SPEC [RFC3473].

   o   IPv6 IF_ID ALARM_SPEC object: Class = TBA, C-Type = 4
       Definition same as IPv6 IF_ID ERROR_SPEC [RFC3473].


3.1.1. IF_ID ALARM_SPEC (and ERROR_SPEC) TLVs

   The following new TLVs are defined for use with the IPv4 and IPv6
   IF_ID ALARM_SPEC objects.  They may also be used with the IPv4 and
   IPv6 IF_ID ERROR_SPEC objects.  See [RFC3471] section 9.1.1 for the
   original definition of these values.  Note the length provided below



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   is for the total TLV.  All TLVs defined in this section are optional.

   No ordering rules apply to the relative ordering of these TLVs.
   These TLVs MUST be listed after any interface identifying TLVs.

      Type    Length     Description
      ----------------------------------
      512       8        REFERENCE_COUNT
      513       8        SEVERITY
      514       8        TIMESTAMP
      515    variable    ERROR_STRING

   The Reference Count TLV has the following format:

       0                   1                   2                   3
       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |              Type             |             Length            |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                        Reference Count                        |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

      Reference Count: 32 bits

         The number of times this alarm has been repeated.  This field
         MUST NOT be set to zero.

      Only one Reference Count TLV may be included in an object.

   The Severity TLV has the following format:

       0                   1                   2                   3
       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |              Type             |             Length            |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |            Reserved                   |Impact |   Severity    |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

      Reserved: 24 bits

         This field is reserved.  It MUST be set to zero on transmission
         and MUST be ignored on receipt.








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      Impact: 4 bits

         Indicates the impact of the alarm indicated in the TLV.  The
         following values are defined:

          Value       Definition
          -----       ---------------------
            0         Unspecified impact
            1         Non-Service Affecting
            2         Service Affecting

      Severity: 8 bits

         Indicates the impact of the alarm indicated in the TLV.  The
         following values are defined:

          Value       Definition
          -----       ----------
            0         Reserved
            1         Critical
            2         Major
            3         Minor
            4         Warning

      Only one Severity TLV may be included in an object.

   The Timestamp TLV has the following format:

       0                   1                   2                   3
       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |              Type             |             Length            |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                            Timestamp                          |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

      Timestamp: 32 bits

         The number of seconds since 0000 UT on 1 January 1970.

      Only one Timestamp TLV may be included in an object.










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   The Error String TLV has the following format:

       0                   1                   2                   3
       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |              Type             |             Length            |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                                                               |
      //          Error String      (NULL padded display string)      //
      |                                                               |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

      Error String: 32 bits minimum (variable)

         A string of characters, representing the type of error/alarm.
         This string is padded to the next largest 4 byte boundary using
         null characters.  Null padding is not required when the string
         is 4-byte aligned.  The contents of error string are
         implementation dependent.  See the condition types listed in
         Appendices of [GR833] for a list of example strings.

      Multiple Error String TLVs may be included in an object.



3.1.2. Procedures

   This section applies to nodes that support the communication of alarm
   information.  ALARM_SPEC objects are carried in Path and Resv
   messages.  Multiple ALARM_SPEC objects MAY be present.  The IPv4 and
   IPv6 formats of the ALARM_SPEC object, C-Type 1 and 2, SHOULD NOT be
   used as they do not support the inclusion of TLVs defined above.

   Nodes that support the communication of alarm information, SHOULD
   record the information contained in a received ALARM_SPECs for later
   use.  All ALARM_SPEC objects received in Path messages SHOULD be
   passed unmodified downstream in the corresponding Path messages.  All
   ALARM_SPEC objects received in Resv messages SHOULD be passed
   unmodified upstream in the corresponding Resv messages.  ALARM_SPEC
   objects are merged in transmitted Resv messages by including a copy
   of all ALARM_SPEC objects received in corresponding Resv Messages.

   To advertise local alarm information, a node generates an ALARM_SPEC
   object for each alarm and adds it to both the Path and Resv messages
   for the affected LSP.  The IPv4 or IPv6 IF_ID ALARM_SPEC object
   format SHOULD be used.  In all cases, appropriate Error Node Address,
   Error Code and Error Values MUST be set, see below for a discussion
   on Error Code and Error Values.  The InPlace and NotGuilty flags



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   SHOULD NOT be set.  When the IPv4 or IPv6 IF_ID ALARM_SPEC object
   format is used, TLVs SHOULD be included to identify the interface, if
   any, the severity, the time and a brief string associated with the
   alarm.  The reference count TLV MAY also be included.  ALARM_SPEC
   objects received from other nodes are not effected by the addition of
   local ALARM_SPEC objects, i.e., they continue to be processed as
   described above.  Note the choice of which alarm to advertise and
   which to omit is a local policy matter, and may configurable by the
   user.

   Note, ALARM_SPEC objects SHOULD NOT be added to LSPs that are
   "administratively down" or are in "alarm communication inhibited"
   states.  These states are indicated by the A and I bits of the
   Admin_Status object, see Section 3.2.

   To remove local alarm information, a node simply removes the matching
   locally generated ALARM_SPEC objects from the outgoing Path and Resv
   messages.  A node MAY modify a locally generated ALARM_SPEC object.

   Normal refresh and trigger message processing applies to Path or Resv
   message that contain ALARM_SPEC objects.  Note that changes in
   ALARM_SPEC objects from one message to the next may include a change
   in the contents of a specific ALARM_SPEC object, or a change in the
   number of present ALARM_SPEC objects.


3.1.3. Error Codes and Values

   The Error Codes and Values used in ALARM_SPEC objects are the same as
   those used in ERROR_SPEC objects.  New Error Code values for use with
   both ERROR_SPEC and ALARM_SPEC objects may be assigned to support
   alarm types defined by other standards.

   [NOTE: this is a place holder for references to possibly
    multiple specs that define alarm code points.  Each spec would be
    assigned a specific error code. Error values would match values
    assigned in each spec]


3.1.4. Backwards Compatibility

   The support of ALARM_SPEC objects is optional.  Non-supporting nodes
   will pass the objects  through the node unmodified, because the
   ALARM_SPEC object has a C-Num of the form 11bbbbbb.

   This allows alarm information to be collected and examined in a
   network built from mixed nodes some of which do support the
   communication of alarm information, and some of which do not.



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3.2. Controlling Alarm Communication

   Alarm information is communication is controlled via Administrative
   Status Information as carried in the Admin_Status object.  A new bit
   is defined, called the I bit, that indicates when alarm communication
   is to be inhibited.  The definition of this bit does not modify the
   procedures defined in Section 7 of [RFC3473].


3.2.1. Updated Admin Status Object


   The format of the Admin_Status object is updated to include the I
   bit:

       0                   1                   2                   3
       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |            Length             | Class-Num(196)|   C-Type (1)  |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |R|                        Reserved                     |I|T|A|D|
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   Inhibit Alarm Communication (I): 1 bit
         When set, indicates that alarm communication is disabled for
         the LSP and that nodes SHOULD NOT add local alarm information.

         See [RFC3471] for the definition of the remaining bits.

3.2.2. Procedures

   The I bit may be set and cleared using the procedures defined in
   Sections 7.2 and 7.3 of [RFC3473].  A node that receives (or
   generates) an Admin_Status object with the A and I bits set, it
   SHOULD remove all local alarm information from the matching LSP's
   outgoing Path and Resv messages.  When a node receives (or generates)
   an Admin_Status object with the A and I bits clear, it should add any
   local alarm information to the matching LSP's outgoing Path and Resv
   messages.  The processing of non-locally generated ALARM_SPEC objects
   MUST NOT be impacted by the contents of the Admin_Status object.
   Note, per [RFC3473], the absence of the Admin_Status object is
   equivalent to receiving an object containing values all set to zero
   (0).

   When generating Notify messages for LSPs with the I bit set, the TLVs
   described in this document MAY be added to the ERROR_SPEC object sent
   in the the Notify message.




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3.3. Message Formats

   This section presents the RSVP message related formats as modified by
   this document.  The formats specified in [RFC3473] served as the
   basis of these formats.

   The format of a Path message is as follows:

   <Path Message> ::=       <Common Header> [ <INTEGRITY> ]
                            [ [<MESSAGE_ID_ACK> | <MESSAGE_ID_NACK>] ... ]
                            [ <MESSAGE_ID> ]
                            <SESSION> <RSVP_HOP>
                            <TIME_VALUES>
                            [ <EXPLICIT_ROUTE> ]
                            <LABEL_REQUEST>
                            [ <PROTECTION> ]
                            [ <LABEL_SET> ... ]
                            [ <SESSION_ATTRIBUTE> ]
                            [ <NOTIFY_REQUEST> ]
                            [ <ADMIN_STATUS> ]
                            [ <POLICY_DATA> ... ]
                            [ <ALARM_SPEC> ... ]
                            <sender descriptor>

   <sender descriptor> is not modified by this document.

   The format of a Resv message is as follows:

   <Resv Message> ::=       <Common Header> [ <INTEGRITY> ]
                            [ [<MESSAGE_ID_ACK> | <MESSAGE_ID_NACK>] ... ]
                            [ <MESSAGE_ID> ]
                            <SESSION> <RSVP_HOP>
                            <TIME_VALUES>
                            [ <RESV_CONFIRM> ]  [ <SCOPE> ]
                            [ <NOTIFY_REQUEST> ]
                            [ <ADMIN_STATUS> ]
                            [ <POLICY_DATA> ... ]
                            [ <ALARM_SPEC> ... ]
                            <STYLE> <flow descriptor list>

   <flow descriptor list> is not modified by this document.










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4. Acknowledgments

   Valuable comments and input were received from a number of people,


5. Security Considerations

   Some operators may consider alarm information as sensitive.  To
   support environments where this is the case, implementations SHOULD
   allow the user to disable the generation of ALARM_SPEC objects.

   This draft introduces no additional security considerations.  See
   [RFC3473] for relevant security considerations.


6. IANA Considerations

   IANA is requested to administer assignment of new values for
   namespaces defined in this document.  This section uses the
   terminology of BCP 26 "Guidelines for Writing an IANA Considerations
   Section in RFCs" [BCP26].

   This document defines a new RSVP "ALARM_SPEC object" with a Class-Num
   of the form 11bbbbbb.  The value 197 is suggested.  The C-type values
   associated with this object should read "Same values as ERROR_SPEC
   (C-Num 6)".

   This document also defines the following TLVs for use with the IF_ID
   ERROR_SPEC objects defined in [RFC3473].  Please see Section 3.1.1
   for a list of TLV description and type values.

   Note that the type values are not sequential with existing ERROR_SPEC
   object TLV assignments.  This is intentional and is intended to
   provide space for future error TLVs.


7. Intellectual Property Considerations

   This section is taken from Section 10.4 of [RFC2026].

   The IETF takes no position regarding the validity or scope of any
   intellectual property or other rights that might be claimed to
   pertain to the implementation or use of the technology described in
   this document or the extent to which any license under such rights
   might or might not be available; neither does it represent that it
   has made any effort to identify any such rights.  Information on the
   IETF's procedures with respect to rights in standards-track and
   standards-related documentation can be found in BCP-11.  Copies of



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   claims of rights made available for publication and any assurances of
   licenses to be made available, or the result of an attempt made to
   obtain a general license or permission for the use of such
   proprietary rights by implementors or users of this specification can
   be obtained from the IETF Secretariat.

   The IETF invites any interested party to bring to its attention any
   copyrights, patents or patent applications, or other proprietary
   rights which may cover technology that may be required to practice
   this standard.  Please address the information to the IETF Executive
   Director.


8. References

8.1. Normative References

[RFC3471]   Berger, L., Editor, "Generalized Multi-Protocol
            Label Switching (GMPLS) Signaling Functional
            Description", RFC 3471, January 2003.

[RFC3473]   Berger, L., Editor "Generalized Multi-Protocol Label
            Switching (GMPLS) Signaling - Resource ReserVation
            Protocol-Traffic Engineering (RSVP-TE) Extensions",
            RFC 3473, January 2003.



8.2. Informative References

[GR833]     Bellcore, "Network Maintenance: Network Element and
            Transport Surveillance Messages" (GR-833-CORE), Issue 3,
            February 1999.

[RFC2119]   Bradner, S., "Key words for use in RFCs to Indicate
            Requirement Levels," RFC 2119.















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9. Contributors


   Contributors are listed in alphabetical order:

   Lou Berger                                 Deborah Brungard
   Movaz Networks, Inc.                       AT&T Labs, Room MT D1-3C22
   7926 Jones Branch Drive                    200 Laurel Avenue
   Suite 615
   McLean VA, 22102                           Middletown, NJ 07748, USA
   Phone:  +1 703 847-1801                    Phone:  (732) 420-1573
   Email:  lberger@movaz.com                  Email:  dbrungard@att.com

   Igor Bryskin                               Adrian Farrel
   Movaz Networks, Inc.                       Old Dog Consulting
   7926 Jones Branch Drive
   Suite 615
   McLean VA, 22102                           Phone:  +44 (0) 1978 860944
   Email:  ibryskin@movaz.com                 Email:  adrian@olddog.co.uk

   Dimitri Papadimitriou (Alcatel)            Arun Satyanarayana
   Francis Wellesplein 1                      Movaz Networks, Inc.
   B-2018 Antwerpen, Belgium                  7926 Jones Branch Drive
                                              Suite 615
                                              McLean VA, 22102
   Phone:  +32 3 240-8491                     Phone:  +1 703 847-1785
   Email:  dimitri.papadimitriou@alcatel.be   Email:  aruns@movaz.com


10. Contact Address


   Lou Berger
   Movaz Networks, Inc.
   7926 Jones Branch Drive
   Suite 615
   McLean VA, 22102
   Phone:  +1 703 847-1801
   Email:  lberger@movaz.com












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