[Docs] [txt|pdf] [draft-ietf-pwe3-p...] [Diff1] [Diff2]

PROPOSED STANDARD

Network Working Group                                     T. Nadeau, Ed.
Request for Comments: 5542                                            BT
Category: Standards Track                                  D. Zelig, Ed.
                                                                  Oversi
                                                        O. Nicklass, Ed.
                                                               RADVISION
                                                                May 2009


   Definitions of Textual Conventions for Pseudowire (PW) Management

Status of This Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

Copyright Notice

   Copyright (c) 2009 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 in effect on the date of
   publication of this document (http://trustee.ietf.org/license-info).
   Please review these documents carefully, as they describe your rights
   and restrictions with respect to this document.

   This document may contain material from IETF Documents or IETF
   Contributions published or made publicly available before November
   10, 2008.  The person(s) controlling the copyright in some of this
   material may not have granted the IETF Trust the right to allow
   modifications of such material outside the IETF Standards Process.
   Without obtaining an adequate license from the person(s) controlling
   the copyright in such materials, this document may not be modified
   outside the IETF Standards Process, and derivative works of it may
   not be created outside the IETF Standards Process, except to format
   it for publication as an RFC or to translate it into languages other
   than English.










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Abstract

   This memo defines a Management Information Base (MIB) module that
   contains textual conventions (TCs) to represent commonly used
   pseudowire (PW) management information.  The intent is that these TCs
   will be imported and used in PW-related MIB modules that would
   otherwise define their own representations.

Table of Contents

   1. Introduction ....................................................2
   2. The Internet-Standard Management Framework ......................2
   3. Conventions Used in This Document ...............................2
   4. Object Definitions ..............................................3
   5. Security Considerations .........................................9
   6. IANA Considerations .............................................9
   7. References .....................................................10
      7.1. Normative References ......................................10
      7.2. Informative References ....................................10

1.  Introduction

   This memo defines a portion of the Management Information Base (MIB)
   for use with network management protocols in the Internet community.
   In particular, it defines textual conventions used for pseudowire
   (PW) technology and for Pseudowire Edge-to-Edge Emulation (PWE3) MIB
   modules.

2.  The Internet-Standard Management Framework

   For a detailed overview of the documents that describe the current
   Internet-Standard Management Framework, please refer to section 7 of
   RFC 3410 [RFC3410].

   Managed objects are accessed via a virtual information store, termed
   the Management Information Base or MIB.  MIB objects are generally
   accessed through Simple Network Management Protocol (SNMP).  Objects
   in the MIB are defined using the mechanisms defined in the Structure
   of Management Information (SMI).  This memo specifies a MIB module
   that is compliant to the SMIv2, which is described in STD 58, RFC
   2578 [RFC2578], STD 58, RFC 2579 [RFC2579] and STD 58, RFC 2580
   [RFC2580].

3.  Conventions Used in This Document

   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].



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4.  Object Definitions

   PW-TC-STD-MIB DEFINITIONS ::= BEGIN

   IMPORTS
      MODULE-IDENTITY, Unsigned32, mib-2
         FROM SNMPv2-SMI               -- [RFC2578]

      TEXTUAL-CONVENTION
         FROM SNMPv2-TC;               -- [RFC2579]

   pwTcStdMIB MODULE-IDENTITY
      LAST-UPDATED "200904210000Z"  -- 21 April 2009 00:00:00 GMT
      ORGANIZATION "Pseudowire Edge-to-Edge Emulation (PWE3) Working
                    Group"
      CONTACT-INFO
      " Thomas D. Nadeau
        Email:  tom.nadeau@bt.com

        David Zelig
        Email: davidz@oversi.com

        Orly Nicklass
        Email: orlyn@radvision.com

        The PWE3 Working Group (email distribution pwe3@ietf.org,
        http://www.ietf.org/html.charters/pwe3-charter.html)
       "

      DESCRIPTION
         "This MIB module defines TEXTUAL-CONVENTIONS
         for concepts used in pseudowire edge-to-edge
         networks.

         Copyright (c) 2009 IETF Trust and the persons identified
         as authors of the code.  All rights reserved.

         Redistribution and use in source and binary forms, with or
         without modification, are permitted provided that the following
         conditions are met:

         - Redistributions of source code must retain the above
           copyright notice, this list of conditions and the following
           disclaimer.







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         - Redistributions in binary form must reproduce the above
           copyright notice, this list of conditions and the following
           disclaimer in the documentation and/or other materials
           provided with the distribution.

         - Neither the name of Internet Society, IETF or IETF Trust, nor
           the names of specific contributors, may be used to endorse or
           promote products derived from this software without specific
           prior written permission.

         THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
         CONTRIBUTORS 'AS IS' AND ANY EXPRESS OR IMPLIED WARRANTIES,
         INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
         MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
         DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
         CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
         SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
         NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
         LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
         HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
         CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
         OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
         EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

         This version of this MIB module is part of RFC 5542;
         see the RFC itself for full legal notices."

      -- Revision history.

      REVISION "200904210000Z"  -- 21 April 2009 00:00:00 GMT
      DESCRIPTION
           "Original Version"
         ::= { mib-2 188 }

   PwGroupID ::= TEXTUAL-CONVENTION
      DISPLAY-HINT "d"
      STATUS      current
      DESCRIPTION
           "An administrative identification for grouping a
            set of service-specific pseudowire services."
      SYNTAX  Unsigned32

   PwIDType ::= TEXTUAL-CONVENTION
      DISPLAY-HINT "d"
      STATUS      current






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      DESCRIPTION
           "Pseudowire Identifier.  Used to identify the PW
            (together with some other fields) in the signaling
            session."
      SYNTAX  Unsigned32

   PwIndexType ::= TEXTUAL-CONVENTION
      DISPLAY-HINT "d"
      STATUS      current
      DESCRIPTION
           "Pseudowire Index.  A unique value, greater than zero,
           for each locally defined PW.  Used for indexing
           several MIB tables associated with the particular PW.
           It is recommended that values are assigned contiguously
           starting from 1.  The value for each PW MUST remain
           constant at least from one re-initialization
           to the next re-initialization."
      SYNTAX  Unsigned32 (1..4294967295)

   PwIndexOrZeroType ::= TEXTUAL-CONVENTION
      DISPLAY-HINT "d"
      STATUS      current
      DESCRIPTION
           "This TEXTUAL-CONVENTION is an extension of the
            PwIndexType convention.  The latter defines a greater-
            than-zero value used to identify a pseudowire
            in the managed system.  This extension permits the
            additional value of zero.  The zero value is object-specific
            and MUST therefore be defined as part of the description of
            any object that uses this syntax.  Examples of the usage of
            zero might include situations where pseudowire was unknown,
            or where none or all pseudowires need to be referenced."
       SYNTAX  Unsigned32 (0..4294967295)

   PwOperStatusTC ::= TEXTUAL-CONVENTION
      STATUS      current
      DESCRIPTION
        "Indicates the operational status of the PW.

        - up(1):             Ready to pass packets.
        - down(2):           PW signaling is not yet finished, or
                             indications available at the service
                             level indicate that the PW is not
                             passing packets.
        - testing(3):        AdminStatus at the PW level is set to
                             test.





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        - dormant(4):        The PW is not in a condition to pass
                             packets but is in a 'pending' state,
                             waiting for some external event.
        - notPresent(5):     Some component is missing to accomplish
                             the setup of the PW.  It can be
                             configuration error, incomplete
                             configuration, or a missing H/W component.
        - lowerLayerDown(6): One or more of the lower-layer interfaces
                             responsible for running the underlying PSN
                             is not in OperStatus 'up' state."
    SYNTAX   INTEGER {
        up(1),
        down(2),
        testing(3),
        dormant(4),
        notPresent(5),
        lowerLayerDown(6)
        }

   PwAttachmentIdentifierType ::= TEXTUAL-CONVENTION
      STATUS      current
      DESCRIPTION
         "An octet string used in the generalized Forward Error
          Correction (FEC) element for identifying attachment forwarder
          and groups.  A NULL identifier is of zero length.
         "
     SYNTAX    OCTET STRING (SIZE (0..255))

   PwGenIdType ::= TEXTUAL-CONVENTION
      STATUS      current
      DESCRIPTION
         "Represents the Attachment Group Identifier (AGI) Type and
          Attachment Individual Identifier (AII) Type in generalized FEC
          signaling and configuration.
         "
     SYNTAX    Unsigned32( 0..254 )

   PwCwStatusTC ::= TEXTUAL-CONVENTION
      STATUS      current
      DESCRIPTION
         "Indicates the status of the control word (CW) negotiation
          based on the local configuration and the indications received
          from the peer node.

          waitingForNextMsg(1) indicates that the node is waiting for
          another label mapping from the peer.





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          sentWrongBitErrorCode(2) indicates that the local node has
          notified the peer about a mismatch in the C-bit.

          rxWithdrawWithWrongBitErrorCode(3) indicates that a withdraw
          message has been received with the wrong C-bit error code.

          illegalReceivedBit(4) indicates a C-bit configuration with
          the peer that is not compatible with the PW type.

          cwPresent(5) indicates that the CW is present for this PW.
          If signaling is used, the C-bit is set and agreed upon between
          the nodes.  For manually configured PW, the local
          configuration requires the use of the CW.

          cwNotPresent(6) indicates that the CW is not present for this
          PW.  If signaling is used, the C-bit is reset and agreed upon
          between the nodes.  For manually configured PW, the local
          configuration requires that the CW not be used.

          notYetKnown(7) indicates that a label mapping has not yet
          been received from the peer.
         "
      REFERENCE
         "Martini, et al., 'Pseudowire Setup and Maintenance Using
          the Label Distribution Protocol', [RFC4447]."

      SYNTAX    INTEGER {
                 waitingForNextMsg(1),
                 sentWrongBitErrorCode(2),
                 rxWithdrawWithWrongBitErrorCode(3),
                 illegalReceivedBit(4),
                 cwPresent(5),
                 cwNotPresent(6),
                 notYetKnown(7)
                 }

   PwStatus ::= TEXTUAL-CONVENTION
      STATUS      current
      DESCRIPTION
         "Indicates the status of the PW and the interfaces affecting
          this PW.  If none of the bits are set, it indicates no faults
          are reported.
         "








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      SYNTAX   BITS {
        pwNotForwarding(0),
        servicePwRxFault(1),
        servicePwTxFault(2),
        psnPwRxFault(3),
        psnPwTxFault(4)
        }

   PwFragSize ::= TEXTUAL-CONVENTION
      DISPLAY-HINT "d"
      STATUS      current
      DESCRIPTION
         "If set to a value other than zero, it indicates the desired
          fragmentation length in bytes.  If set to zero,
          fragmentation is not desired for PSN bound packets.
         "
      SYNTAX   Unsigned32

   PwFragStatus ::= TEXTUAL-CONVENTION
      STATUS      current
      DESCRIPTION
         "Indicates the status of the fragmentation/reassembly process
          based on local configuration and peer capability.

          noFrag(0) bit indicates that local configuration is for no
          fragmentation.

          cfgFragGreaterThanPsnMtu(1) bit indicates that the local node
          is set to fragment, but the fragmentation size is greater
          than the MTU available at the PSN between the nodes.
          Fragmentation is not done in this case.

          cfgFragButRemoteIncapable(2) bit indicates that the local
          configuration conveys the desire for fragmentation but
          the peer is not capable of reassembly.

          remoteFragCapable(3) bit indicates that the remote node
          is capable to accept fragmented PDUs.

          fragEnabled(4) bit indicates that fragmentation will be used
          on this PW.  Fragmentation can be used if the local node was
          configured for fragmentation, the peer has the capability
          to accept fragmented packets, and the CW is in use for this
          PW."

      REFERENCE
          "Malis, A. and M. Townsley, 'Pseudowire Emulation Edge-to-
           Edge (PWE3) Fragmentation and Reassembly', [RFC4623]."



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      SYNTAX   BITS {
         noFrag(0),
         cfgFragGreaterThanPsnMtu(1),
         cfgFragButRemoteIncapable(2),
         remoteFragCapable(3),
         fragEnabled(4)
         }

   PwCfgIndexOrzero ::= TEXTUAL-CONVENTION
      DISPLAY-HINT "d"
      STATUS      current
      DESCRIPTION
           "Index in any of the relevant configuration tables for
           supplement information regarding configuration of the
           specific technology.  Value zero implies no additional
           configuration information is applicable."
      SYNTAX  Unsigned32 (0..4294967295)
   END

5.  Security Considerations

   This module does not define any management objects.  Instead, it
   defines a set of textual conventions that may be used by other PWE3
   MIB modules to define management objects.

   Meaningful security considerations can only be written in the MIB
   modules that define management objects.  Therefore, this document has
   no impact on the security of the Internet.

6.  IANA Considerations

   The MIB module in this document uses the following IANA-assigned
   OBJECT IDENTIFIER value recorded in the SMI Numbers registry:

         Descriptor        OBJECT IDENTIFIER value
         ----------        -----------------------
         pwTcStdMIB         { mib-2 188 }














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7.  References

7.1.  Normative References

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119, March 1997.

   [RFC2578]  McCloghrie, K., Perkins, D., and J. Schoenwaelder,
              "Structure of Management Information Version 2 (SMIv2)",
              STD 58, RFC 2578, April 1999.

   [RFC2579]  McCloghrie, K., Perkins, D., and J. Schoenwaelder,
              "Textual Conventions for SMIv2", STD 58, RFC 2579, April
              1999.

   [RFC2580]  McCloghrie, K., Perkins, D., and J. Schoenwaelder,
              "Conformance Statements for SMIv2", STD 58, RFC 2580,
              April 1999.

   [RFC4447]  Martini, L., Ed., Rosen, E., El-Aawar, N., Smith, T., and
              G. Heron, "Pseudowire Setup and Maintenance Using the
              Label Distribution Protocol (LDP)", RFC 4447, April 2006.

   [RFC4623]  Malis, A. and M. Townsley, "Pseudowire Emulation Edge-to-
              Edge (PWE3) Fragmentation and Reassembly", RFC 4623,
              August 2006.

7.2.  Informative References

   [RFC3410]  Case, J., Mundy, R., Partain, D., and B. Stewart,
              "Introduction and Applicability Statements for Internet-
              Standard Management Framework", RFC 3410, December 2002.



















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Authors' Addresses

   Thomas D. Nadeau (editor)
   BT
   BT Centre
   81 Newgate Street
   London  EC1A 7AJ
   United Kingdom

   EMail: tom.nadeau@bt.com


   David Zelig (editor)
   Oversi Networks
   1 Rishon Letzion St.
   Petah Tikva
   Israel

   Phone: +972 77 3337 750
   EMail: davidz@oversi.com


   Orly Nicklass (editor)
   RADVISION
   24 Raul Wallenberg
   Tel Aviv

   Phone: +972 3 776 9444
   EMail: orlyn@radvision.com






















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