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Versions: 00 01 02 03 04 05 06                                          
Network Working Group                                        Fatai Zhang
Internet Draft                                                Xian Zhang
Intended Status: Standards Track                                  Huawei
                                                           D. Ceccarelli
                                                             D. Caviglia
                                                                Ericsson
                                                           Guoying Zhang
                                                                    CATR
                                                                P.Grandi
                                                               S.Belotti
                                                          Alcatel-Lucent

Expires: January 13 2013                                   July 12, 2012

           Link Management Protocol (LMP) extensions for G.709
                       Optical Transport Networks

             draft-zhang-ccamp-gmpls-g709-lmp-discovery-06.txt


Status of this Memo

   This Internet-Draft is submitted to IETF in full conformance with
   the provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF), its areas, and its working groups.  Note that
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   The list of Internet-Draft Shadow Directories can be accessed at
   http://www.ietf.org/shadow.html.

   This Internet-Draft will expire on January 13, 2013.



Abstract






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   Recent progress of the Optical Transport Network (OTN) has introduced
   new signal types (i.e., ODU0, ODU4, ODU2e and ODUflex) and new
   Tributary Slot granularity (1.25Gbps).

   Since equipments deployed prior to recently defined ITU-T
   recommendations only support 2.5 Gbps Tributary Slot granularity and
   ODU1, ODU2 and ODU3 containers, the compatibility problem should be
   considered. In addition, a Higher Order ODU (HO ODU) link may not
   support all the types of Lower Order ODU (LO ODU) signals defined by
   the new OTN standard because of the limitation of the devices at the
   two ends of a link. In these cases, the control plane is required to
   run the capability discovering functions for the evolutive OTN.

   This document describes the extensions to the Link Management
   Protocol (LMP) needed to discover the capability of HO ODU link,
   including the granularity of Tributary Slot to be used and the LO ODU
   signal types that the link can support.

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].

Table of Contents


   1. Introduction ................................................ 3
   2. Terminology ................................................. 4
   3. Overview of the Evolutive G.709.............................. 4
   4. Link Capability Discovery Requirements .......................5
      4.1. Discovering the Granularity of the TS ...................5
      4.2. Discovering the Supported LO ODU Signal Types ...........5
   5. Extensions: LMP Link Summary Message .........................6
      5.1. Message Extension....................................... 7
         5.1.1. LinkSummary Message................................ 7
         5.1.2. LinkSummaryAck Message............................. 7
         5.1.3. LinkSummaryNack Message............................ 7
      5.2. Object Definitions...................................... 8
      5.3. Procedures ............................................ 10
   6. Security Considerations..................................... 11
   7. IANA Considerations ........................................ 11
   8. Acknowledgments ............................................ 11
   9. References ................................................. 12
      9.1. Normative References................................... 12
      9.2. Informative References................................. 12
   10. Authors' Addresses ........................................ 12


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   11. Contributors .............................................. 14

1. Introduction

   The Link Management Protocol (LMP) defined in [RFC4204] is being
   developed as part of the Generalized MPLS (GMPLS) protocol suite to
   manage Traffic Engineering (TE) links.

   Recently, great progress has been made for the Optical Transport
   Networking (OTN) technologies in ITU-T. New ODU containers (i.e.,
   ODU0, ODU4, ODU2e and ODUflex) and a new Tributary Slot (TS)
   granularity (1.25Gbps) have been introduced by the [G709-V3],
   enhancing the flexibility of OTNs.

   With the evolution and deployment of G.709 technology, the backward
   compatibility problem requires to be considered. In data plane, the
   equipment supporting 1.25Gbps TS can combine the specific Tributary
   Slots together (e.g., combination of TS#i and TS#i+4 on a HO ODU2
   link) so that it can interwork with other equipments which support
   2.5Gbps TS. From the control plane point of view, it is necessary to
   discover which type of TS is supported at both ends of a link, so
   that it can choose and reserve the TS resources correctly in this
   link for the connection.

   Additionally, the requirement of discovering the signal types of
   Lower Order ODU (LO ODU) that can be supported by a Higher Order ODU
   (HO ODU) should be taken into account. Equipment at one end of a HO
   ODU link may not support to transport some types of LO ODU signals
   (e.g., may not support the ODUflex). In this case, this HO ODU link
   should not be selected for those types of LO ODU connections.

   From the perspective of control plane, it is necessary to discover
   the capability of a HO ODUk or OTUk link including the granularity of
   TS to be used and the LO ODU signal types that the link can support.
   Note that this capability information can be, in principle,
   discovered by routing. Since in certain case, routing is not present
   (e.g., UNI case) we need to extend link management protocol
   capabilities to cover this aspect. Obviously, in case of routing
   presence, the discovering procedure by LMP could also be optional.

   This document extends the LMP and describes the solution of
   discovering HO ODU link capability.







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2. Terminology

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

3. Overview of the Evolutive G.709

   The traditional OTN standard [ITUT-G709] describes the optical
   transport hierarchy (OTH) and introduces three ODU signal types (i.e.,
   ODU1, ODU2 and ODU3). The ODUj can be mapped into one or more
   Tributary Slots (with a granularity of 2.5Gbps) of OPUk where j<k.
   The ODUj can also be mapped into OTUj (j=1, 2 or 3) directly.

   Recent revisions of ITU-T Recommendation G.709 have introduced new
   features for the evolutive Optical Transport Networks (OTN). New ODU
   signals, including ODU0, ODU4, ODU2e and ODUflex, are described in
   [G709-V3]. This document also defines the new multiplexing hierarchy
   for the evolutive OTN. In this multiplexing hierarchy, LO ODUj can be
   mapped into an OTUj, or multiplexed into a HO ODUk (where j<k) by
   occupying several tributary slots.

   In case of LO ODUj mapping into OTUj, the following mappings are
   defined:

      - ODU1 into OTU1 mapping

      - ODU2 into OTU2 mapping

      - ODU3 into OTU3 mapping

      - ODU4 into OTU4 mapping

   In case of LO ODUj multiplexing into HO ODUk, a new Tributary Slot
   granularity (i.e., 1.25Gbps) is introduced in [G709-V3]. For the
   evolutive OTN, the multiplexing of ODUj (j = 0, 1, 2, 2e, 3, flex)
   into an ODUk (k > j) signal can be depicted as follows:

      - ODU0 into ODU1 multiplexing (with 1,25Gbps TS granularity)

      - ODU0, ODU1, ODUflex into ODU2 multiplexing (with 1.25Gbps TS
         granularity)

      - ODU1 into ODU2 multiplexing (with 2.5Gbps TS granularity)

      - ODU0, ODU1, ODU2, ODU2e and ODUflex into ODU3 multiplexing
         (with 1.25Gbps TS granularity)


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      - ODU1, ODU2 into ODU3 multiplexing (with 2.5Gbps TS granularity)

      - ODU0, ODU1, ODU2, ODU2e, ODU3 and ODUflex into ODU4
         multiplexing (with 1.25Gbps TS granularity)

   Note that If TS auto-negotiation is supported, a node supporting
   1.25Gbps TS can interwork with the other nodes that supporting
   2.5Gbps TS by combining specific TSs together in data plane, as
   descirbied in [OTN-frwk].

4. Link Capability Discovery Requirements

4.1. Discovering the Granularity of the TS

   As described in section 3.1, if the two ends of a link use different
   granularities of TS, The LO ODU must be mapped into specific combined
   Tributary Slots in the end of link with TS of 1.25Gbps.

   From the perspective of control plane, when creating a LO ODU
   connection, the node MUST select and reserve specific TS for the
   connection if the two ends of a link use different granularities of
   TS. For example, for an ODU2 link, we suppose that node A only
   supports the 2.5Gbps TS while node B supports the 1.25Gbps TS. When
   node B receives a Path message from node A requesting an ODU1
   connection, node B MUST reserve the TS#i and TS#i+4 (where i<=4)
   (with the granularity of 1.25Gbps) and tell node A via the label
   carried in the Resv message that the TS#i (with the granularity of
   2.5Gbps) among the 4 slots has been reserved for the ODU1 connection.
   Otherwise, the reservation procedure will fail.

          +-----+         Path          +-----+
          |     |    ------------>      |     |
          |  A  +-------ODU2 link-------+  B  |
          |     |    <-------------     |     |
          +-----+         Resv          +-----+
     (Support 2.5G TS)              (Support 1.25G TS)

   Therefore, for an ODU2 or ODU3 link, in order to reserve TS resources
   correctly for a LO ODU connection, the control plane of the two ends
   MUST know which granularity the other end can support before creating
   the LO ODU connection.

4.2. Discovering the Supported LO ODU Signal Types

   Many new ODU signal types are introduced by [G709-V3], such as ODU0,
   ODU4, ODU2e and ODUflex. It is possible that equipment does not
   always support all the LO ODU signal types introduced by [G709-V3].


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   If one end of a HO ODU link can not support a certain LO ODU signal
   type and there is no HO ODU FA LSP able to support this LO ODU signal,
   the HO ODU link/FA LSP can not be selected to carry such type of LO
   ODU connection.

   For example, in the following figure, if the interfaces IF1, IF2, IF8,
   IF7, IF5 and IF6 can support ODUflex signals, while the interfaces IF
   3 and IF4 can not support ODUflex signals. In this case, if one
   ODUflex connection from A to C is requested, and there is no HO ODU
   FA LSP from node A to C through node B, link #1 and #2 should be
   excluded, link #3 and link #4 are the candidates (the possible path
   could be A-D-C through link #3 and link #4).


                              +-----+
                    link #3   |     |  link #4
            +-----------------+  D  +-----------------+
            |              IF8|     |IF7              |
            |                 +-----+                 |
            |                                         |
            |IF1                                   IF6|
         +--+--+              +-----+              +--+--+
         |     |    link #1   |     |    link #2   |     |
         |  A  +--------------+  B  +--------------+  C  |
         |     |IF2        IF3|     |IF4        IF5|     |
         +-----+              +-----+              +-----+


   Therefore, it is necessary for the two ends of a HO ODU link to
   discover which types of LO ODU can be supported by the HO ODU link.
   After discovering, the capability information can be flooded by IGP,
   so that the correct path for an ODU connection can be calculated.

5. Extensions: LMP Link Summary Message

   [RFC4204] defines the Link Management Protocol (LMP) which consists
   of four main procedures: control channel management, link property
   correlation, link connectivity verification, and fault management. As
   part of LMP, the link property correlation is used to verify the
   consistency of the TE and data link information on both sides of a
   link. This document extends the link property correlation procedure
   to discover the capability of both sides of a HO ODU link.

   The designated HO ODU overhead bytes (e.g., the GCC1 and GCC2
   overhead bytes) can be used as the control channel to carry the LMP



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   message after the HO ODU link is created. The out-of-band Data
   Communication Network (DCN) can also be used.

5.1. Message Extension

   Three messages are used for link property correlation: LinkSummary,
   LinkSummaryAck and LinkSummaryNack Message. This document does not
   change the basic procedure of LMP but just add a new subobject (HO
   ODU Link Capability) in the DATA_LINK object to carry the capability
   of one end of a HO ODU link.

   The formats of LinkSummary, LinkSummaryAck and LinkSummaryNack
   messages are defined in [RFC4204].

5.1.1. LinkSummary Message

   The local end of a TE link can send a LinkSummary message to the
   remote end to start the negotiation about the capability that the TE
   link can support.

   One new Subobject named HO ODU Link Capability Subobject in the
   DATA_LINK object is introduced by this document. This new subobect is
   used to tell the remote end of the HO ODU link which TS granularity
   and which LO ODU signal types that the local end can support. When
   the DATA_LINK object carries the new HO ODU Link Capability Subobject,
   the N flag SHOULD be set to 1 which means that the subobject is
   negotiable.

5.1.2. LinkSummaryAck Message

   The LinkSummaryAck message is used to tell the remote end that it has
   the same capability as the remote end after the LinkSummary message
   is received by the local end.

5.1.3. LinkSummaryNack Message

   The LinkSummaryNack message is used to tell the remote end that it
   has different capability from the remote end after the LinkSummary
   message is received by the local end. The LinkSummaryNack message
   also carries the HO ODU Link Capability subobject in the DATA_LINK
   object to tell the remote end the exact capability of the HO ODU link
   after negotiation, i.e., the granularity of TS and the types of LO
   ODU that both side of the HO ODU link can support.



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5.2. Object Definitions

   A new HO ODU Link Capability subobject type is introduced to the DATA
   LINK object to carry the HO ODU link capability information. The
   format of the new subobject is defined as follow:

    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     |OD(T)Uk| T |     Reserved      |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |A|B|C|D|E|F|G|  LO ODU Flags   |            Reserved           |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


   Type (8 bits):

   The value of this subobject type is TBD.

   Length (8 bits):

   The Length field contains the total length of the subobject in bytes,
   including the Type and Length fields. As for RFC 4204, the Length
   MUST be at least 4, and MUST be a multiple of 4. Value of this field
   is 8.

    OD(T)Uk (4 bits):

   This field is used to indicate the HO ODU link type (in case of LO
   ODUj multiplexing into HO ODUk, wherein j<k) or the OTU link type (in
   case of LO ODUk mapping into OTUk).

   OD(T)Uk field     Signal type of HO ODUk or OTUk
   -------------     ------------------------------
      0              Reserved (for future use)
      1              HO ODU1 or OTU1
      2              HO ODU2 or OTU2
      3              HO ODU3 or OTU3
      4              HO ODU4 or OTU4
      5-15           Reserved (for future use)


   T (2 bits):

   The T bits are used to indicate the granularity of the TS of the HO
   ODU link.


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   T field      TS type
   -------      -------
     00         Meaningless
     01         1.25Gbps TS granularity
     10         2.5Gbps TS granularity
     11         Reserved (for future use)

   In case that an OTUk link only support ODUj (j=k) into OTUk mapping
   and does not support any ODUj into ODUk (j<k) multiplexing, then the
   T field is not meaningful and MUST be filled with 0 and be ignored on
   receipt.

   LO ODU flags (A|B|C|D|E|F|G) (16 bits):

   These flags are used to indicate which LO ODU signal types that one
   end or the both end can support. The flags will be set to 1 if the
   corresponding LO ODU signal types are supported to be mapped or
   multiplexed into the OTUk or HO ODUk link.

   This rule imposes that:

   - At least one flag is set to 1.

   - When the ODUj (j=k) flag corresponding to the signal type HO
      ODUk/OTUk is set to 1, then the signal type OD(T)Uk has to be
      intended as LO ODUk and direct mapping over OTUk is supported.

      * Furthermore, if only the ODUj(j=k) flag is set to 1, it means
         that the HO ODUk/OTUk link only supports ODUj(j=k) into OTUk
         mapping. In other words, the link does not support any ODUj
         into ODUk (j<k) multiplexing (i.e., payload type != 20/21), but
         may support carrying various non-ODU client signals listed in
         Table 15-8 of [G709-V3].

   - When an ODUj (j<k) flag not corresponding to the signal type HO
      ODUk/OTUk is set to 1 then the signal type OD(T)Uk has to be
      intended as HO ODUk and multiplexing of LO ODUj over HO ODUk is
      supported.

        Flag A: indicates whether LO ODU0 is supported.

        Flag B: indicates whether LO ODU1 is supported.

        Flag C: indicates whether LO ODU2 is supported.

        Flag D: indicates whether LO ODU3 is supported.


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        Flag E: indicates whether LO ODU4 is supported.

        Flag F: indicates whether LO ODU2e is supported.

        Flag G: indicates whether LO ODUflex is supported.

   For example, if one end of an OTU2 link supports LO ODU0, LO ODU1, LO
   ODUflex into HO ODU2 multiplexing and supports LO ODU2 into OTU2
   mapping, the flags A, B, C, and G will be set to 1.

   As a further example, if one end of an OTU2 link supports only LO
   ODU2 into OTU2 mapping but no multiplexing, only flag C will be set
   to 1.

   The remaining flags are reserved for future use and MUST be set to 0.

5.3. Procedures

   The Link Summary messages used for capability discovery for HO ODUk
   or OTUk link are sent between adjacent nodes after the HO ODU link is
   created or driven by some events (e.g., an operator command). The
   procedure is described below:

   o The local end of the HO ODU link sends a LinkSummary message
      including one or more DATA_LINK objects, each of which contains
      the Local_Interface_Id, the Remote_Interface_Id, and the HO ODU
      link capability subobject. This subobject carries the capability
      that the local end can support, i.e., the granularity of TS and
      the set of LO ODU signal types that the local end can support. The
      LinkSummary message is sent to the remote end.

   o On receipt of the LinkSummary message, the remote end of the HO
      ODU link firstly determines whether the local/remote Interface_Id
      mappings match those that are stored locally as described in
      [RFC4204], and then obtains the HO ODU link capability subobject
      and determines the capability of the HO ODU link that both ends
      can support. The detail procedures are as follow:

      - Only if both ends support the 1.25Gbps TS, the remote end would
         choose the 1.25Gbps as the negotiated granularity for the HO
         ODU link. In other cases, the 2.5Gbps TS MUST be used (e.g., if
         the local end can support 1.25Gbps, and the remote end can
         support 2.5Gbps, and then the local end should imitate 2.5Gbps).

      - The remote end compares the two sets of LO ODU signal types
         that the local end and the remote end can support, and
         calculates the intersection of them, i.e., extracts all the LO


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         ODU signal types that both two ends can support. This
         intersection is the set of LO ODU signal types that the HO ODU
         link can support.

   o If both the two ends support the same capability, i.e., they
      support the same granularity of TS and the same LO ODU signal
      types, the remote end replies a LinkSummaryAck message to the
      local end. So the both ends know what capability the HO ODU link
      can support.

   o If the two ends support different capabilities, i.e., they support
      different granularities of TS or different LO ODU signal types,
      the remote end replies a LinkSummaryNack message to the local end.
      The LinkSummaryNack message carries an ERROR_CODE object and one
      or more DATA_LINK objects. The ERROR_CODE "Renegotiate
      LINK_SUMMARY parameters" (see [RFC4204]) indicates that the two
      ends of the HO ODU link support different capabilities, and the
      DATA_LINK object carries the HO ODU link capability subobject
      which contains the negotiated granularity of TS and the set of LO
      ODU signal types that both ends can support. The local end can
      learn the HO ODU link capability after receiving the
      LinkSummaryNack message.

   o If the remote end does not support the HO ODU link capability
      negotiation procedure, the LinkSummaryNack message MUST be
      responded with an ERROR_CODE "Not support of HO ODU Link
      Capability subobject" (TBA) indicating the reason of rejection.



6. Security Considerations

   TBD.

7. IANA Considerations

   TBD.

8. Acknowledgments

   TBD.








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9. References

9.1. Normative References

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

   [RFC4204]   J. Lang, Ed., "Link Management Protocol (LMP)", RFC 4204,
               October 2005.

   [OTN-frwk]  Fatai Zhang et al, "Framework for GMPLS and PCE Control
               of G.709 Optical Transport Networks", draft-ietf-ccamp-
               gmpls-g709-framework-08.txt, June 19, 2012.

   [ITUT-G709] ITU-T, "Interface for the Optical Transport Network
               (OTN)", G.709 Recommendation, March 2003.

   [G709-V3]   ITU-T, "Interfaces for the Optical Transport Network
               (OTN)", G.709 Recommendation, December 2009.



9.2. Informative References

   [RFC3945]   Mannie, E., "Generalized Multi-Protocol Label Switching
               (GMPLS) Architecture", RFC 3945, October 2004.

   [RFC4328]   D. Papadimitriou, Ed. "Generalized Multi-Protocol Label
               Switching (GMPLS) Signaling Extensions for G.709 Optical
               Transport Networks Control", RFC 4328, Jan 2006.

10. Authors' Addresses

   Fatai Zhang
   Huawei Technologies
   F3-5-B R&D Center, Huawei Base
   Bantian, Longgang District
   Shenzhen 518129 P.R.China

   Phone: +86-755-28972912
   Email: zhangfatai@huawei.com


   Xian Zhang
   Huawei Technologies Co., Ltd.


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   F3-5-B R&D Center, Huawei Base,
   Bantian, Longgang District
   Shenzhen 518129 P.R.China

   Phone: +86-755-28972913
   Email: zhang.xian@huawei.com

   Daniele Ceccarelli
   Ericsson
   Via A. Negrone 1/A
   Genova - Sestri Ponente
   Italy

   Email: daniele.ceccarelli@ericsson.com


   Diego Caviglia
   Ericsson
   Via A. Negrone 1/A
   Genova - Sestri Ponente
   Italy

   Email: diego.caviglia@ericsson.com

   Guoying Zhang
   China Academy of Telecommunication Research of MII
   11 Yue Tan Nan Jie Beijing, P.R.China

   Phone: +86-10-68094272
   Email: zhangguoying@mail.ritt.com.cn

   Pietro Grandi
   Alcatel-Lucent
   Optics CTO
   Via Trento 30 20059 Vimercate (Milano) Italy
   +39 039 6864930

   Email: pietro_vittorio.grandi@alcatel-lucent.it

   Sergio Belotti
   Alcatel-Lucent


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   Optics CTO
   Via Trento 30 20059 Vimercate (Milano) Italy
   +39 039 6863033

   Email: sergio.belotti@alcatel-lucent.it


11. Contributors

   Yi Lin
   Huawei Technologies Co., Ltd.
   F3-5-B R&D Center, Huawei Base,
   Bantian, Longgang District
   Shenzhen 518129 P.R.China

   Phone: +86-755-28972914
   Email: yi.lin@huawei.com


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