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Versions: 00 01 02 03                                                   
INTERNET-DRAFT                                          Khuzema Pithewan
Intended Status: Standard Track                                Rajan Rao
                                                                Infinera
Expires: January 11, 2014                                  July 10, 2013


              OSPF-TE extensions for MLNMRN based on OTN
              draft-rao-ccamp-mlnmrn-otn-ospfte-ext-02.txt


Abstract

   This document specifies OSPF extensions for multi-layer/multi-region
   where one of the regions is OTN.



Status of this Memo

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

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Copyright and License Notice

   Copyright (c) 2013 IETF Trust and the persons identified as the
   document authors. All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document. Please review these documents



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   carefully, as they describe your rights and restrictions with respect
   to this document. Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.



Table of Contents

   1  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  OTN Layer Identification . . . . . . . . . . . . . . . . . . .  3
   3.  Interface Adjustment Capability Extensions for OTN . . . . . .  4
   4. SONET/SDH Layer Identification  . . . . . . . . . . . . . . . .  5
   5.  Interface Adjustment Capability Extensions for SONET/SDH . . .  5
   6 Procedure  . . . . . . . . . . . . . . . . . . . . . . . . . . .  6
   7 Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . .  6
   8  IANA Considerations . . . . . . . . . . . . . . . . . . . . . .  8
   9 Security Considerations  . . . . . . . . . . . . . . . . . . . .  8
   10  References . . . . . . . . . . . . . . . . . . . . . . . . . .  8
   11 Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . .  9






























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1  Introduction

   This document specifies the OSPF extensions required to work in
   multi-region networks involving OTN. The specification is based on
   the requirement as specified in RFC 5212. As per the said RFC, ISCD
   characterizes the information associated to one or more network
   layers. Same RFC also says that the information about the adjustment
   capabilities of the nodes in the network allow the path computation
   process to select an end-to-end multi-layer or multi- region path
   that includes links with different switching capabilities joined by
   LSRs that can adapt (i.e., adjust) the signal between the links. By
   inference, information about the adjustment capabilities should be
   able to identify a layer in ISCD, if ISCD specifies more than one
   layer.

   RFC6001 specifies how to advertise adjustment capabilities between
   two switching regions. IACD definition has provision to extend it for
   a specific technology through Adjustment Capability Specific
   information (ACSI) field, if required. ACSI field can be used to
   identify a layer in the multi-layer ISCD. OTN being defined as multi-
   layer ISCD, the corresponding IACD needs to be extended to be able to
   carry layer identification so as to enable multi-layer/multi-region
   path computation. similar to OTN, legacy SONET/SDH also has fixed
   multiplexing hierarchy. Adaptation layer in SONET/SDH hierarchy
   requires identification information in ACSI, in order to adapt
   SONET/SDH signal to OTN and vice versa.

   If the interface does not support de-multiplexing, then layer
   identification is not required. Hence, Layer ID sub-TLV is optional.

2.  OTN Layer Identification


   [GMPLS-OTN-OSPF] defines attributes that identifies a layer in multi-
   layer OTN ISCD. These attributes are part of Bandwidth sub-TLV in
   Switch capability specific information of ISCD. These attributes are
   reproduced here for completeness sake.

   * Signal Type: Layer for which bandwidth is being advertised.
   * Hierarchy  : also called as multiplexing branch that specifies all
                  the layers between server layer and signal type.
   * TSG        : Time Slot Granularity


   Absence of this sub-TLV for OTN means that the OTN ISCD doesn't
   support multiplexing.





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3.  Interface Adjustment Capability Extensions for OTN

   RFC6001 defines IACD sub-TLV as follows. Please refer to the RFC for
   definition of individual fields of the sub-TLV.
       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
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      | Lower SC      | Lower Encoding| Upper SC      | Upper Encoding|
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                  Max LSP Bandwidth at priority 0              |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                  Max LSP Bandwidth at priority 1              |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                  Max LSP Bandwidth at priority 2              |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                  Max LSP Bandwidth at priority 3              |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                  Max LSP Bandwidth at priority 4              |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                  Max LSP Bandwidth at priority 5              |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                  Max LSP Bandwidth at priority 6              |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                  Max LSP Bandwidth at priority 7              |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |            Adjustment Capability-specific information         |
      |                           (variable)                          |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+





   Adjustment Capability-specific information abbreviated as ACSI
   henceforth for OTN G.709v3 carries LayerID Sub-TLV which is defined
   as follows

      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 = 1      |R|  Reserved   |           Length              |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |  Signal type  | Num of stages |TSG |    Res   |   Stage#1     |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |    Stage#2    |      ...      |   Stage#N     |    Padding    |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   The definition & meaning of fields used in the above sub-TLV is same



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   as in bandwidth sub-TLV of ISCD as defined in [GMPLS-OTN-OSPF]. This
   LayerID sub-TLV is applicable only when one of the regions is OTN,
   which means either lower or upper SC and Encoding type MUST have
   Switch Cap as OTN-TDM and encoding type as G.709 ODUk.

   R bit is used to make sense whether the Layer ID is for Lower region
   or upper region. 1 means upper region and 0 means lower.

   The 8 priorities of the BW as defined in main IACD structure, is
   adjustment capability between the two regions where one of the region
   is identifies by LayerID sub-TLV.

4. SONET/SDH Layer Identification

   G.707 defines the structure of SDH multiplexing hierarchy and RFC
   4606 defines generalized label structure needed to fully specify
   SONET/SDH multiplexing hierarchy. This Label structure also referred
   as SUKLM structure identifies all the layers of the multiplexing
   hierarchy along with time slots. For the purpose of this draft, only
   layer identification is needed, hence each layer can be identified by
   a bit. Bit value 1 signifies presence of the layer and 0, its
   absence. 5 Bits, each representing one layer is sufficient to fully
   identify the SONET/SDH multiplexing hierarchy.

   Absence of sub-TLV means that the SONET/SDH ISCD doesn't support
   multiplexing and needs only transparent mapping to other Interface.


5.  Interface Adjustment Capability Extensions for SONET/SDH

   Layer ID sub TLV for SONET/SDH is defined as follows


      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 = 2      |R|  Reserved   |           Length              |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |S|U|K|L|M|                Padding                              |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   SUKLM bits signifies the presence of SONET/SDH layers and these bits
   together fully specifies the multiplexing hierarchy. Refer to Section
   3 of RFC 4606 for full specification of SUKLM bits.







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6 Procedure

   A node advertising IACD for the bandwidth between regions where one
   or both of them are hierarchical i.e. OTN or SONET/SDH, MUST include
   the Layer ID sub-TLV as part of ACSI as defined above.

   For multi-region path computation, the path computing node MUST look
   at the LayerID sub-TLV (in ACSI part of IACD) if lower/upper {SC,Enc]
   is {OTN-TDM,G.709ODUk} or {TDM,SONET/SDH} to identify the layer for
   correct layer for BW check.

7 Examples

   This section exemplifies TLV values for various technology region
   combinations, where one of the region is OTN

   a. Ethernet and OTN   When upper region is Ethernet and lower region
   is OTN

      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
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      | PSC-1         | Ethernet      | OTN-TDM       | G.709 ODUk    |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                  Max LSP Bandwidth at priority 0              |
      |                    / / / / / / / / / / / / / / /              |
      |                  Max LSP Bandwidth at priority 7              |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      | Type = 1      |0|  Reserved   |           Length              |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |  Signal type  | Num of stages |TSG |    Res   |   Stage#1     |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |    Stage#2    |      ...      |   Stage#N     |    Padding    |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

















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   b. OTN and FlexChannel
      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
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      | OTN-TDM       | G.709 ODUk    |  SCSC         | Lambda        |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                  Max LSP Bandwidth at priority 0              |
      |                    / / / / / / / / / / / / / / /              |
      |                  Max LSP Bandwidth at priority 7              |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      | Type = 1      |1|  Reserved   |           Length              |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |  Signal type  | Num of stages |TSG |    Res   |   Stage#1     |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |    Stage#2    |      ...      |   Stage#N     |    Padding    |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


   c. OTN and SONET/SDH
      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
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      | OTN-TDM       | G.709 ODUk    |  TDM          | Sonet/SDH     |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                  Max LSP Bandwidth at priority 0              |
      |                    / / / / / / / / / / / / / / /              |
      |                  Max LSP Bandwidth at priority 7              |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      | Type = 1      |1|  Reserved   |           Length              |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |  Signal type  | Num of stages |TSG |    Res   |   Stage#1     |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |    Stage#2    |      ...      |   Stage#N     |    Padding    |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      | Type = 2      |0|  Reserved   |           Length              |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |S|U|K|L|M|                Padding                              |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+













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   d. OTN and OTN

      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
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      | OTN-TDM       | G.709 ODUk    |  OTN-TDM       | G.709 ODUk   |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                  Max LSP Bandwidth at priority 0              |
      |                    / / / / / / / / / / / / / / /              |
      |                  Max LSP Bandwidth at priority 7              |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      | Type = 1      |0|  Reserved   |           Length              |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |  Signal type  | Num of stages |TSG |    Res   |   Stage#1     |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |    Stage#2    |      ...      |   Stage#N     |    Padding    |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      | Type = 1      |1|  Reserved   |           Length              |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |  Signal type  | Num of stages |TSG |    Res   |   Stage#1     |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |    Stage#2    |      ...      |   Stage#N     |    Padding    |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


8  IANA Considerations

   TBD

9 Security Considerations

   TBD

10  References

   [RFC5212]  K. Shiomoto, Papadimitriou, D.,JL. Le Roux, Vigoureux, M.,
              Brungard, D., "Requirements for GMPLS-Based Multi-Layer
              and Multi-Region Networks (MLN/ MRN)",RFC 5212, July 2008.

   [RFC6001]  Papadimitriou, D., Vigoureux, M., Shiomoto, K., Brungard,
              D., and JL. Le Roux, "Generalized MPLS (GMPLS) Protocol
              Extensions for Multi-Layer and Multi-Region Networks
              (MLN/MRN)", RFC 6001, October 2010.

   [RFC4606]  E. Mannie, Perceval, D. Papadimitriou, "Generalized Multi-
              Protocol Label Switching (GMPLS) Extensions for
              Synchronous Optical Network (SONET) and Synchronous
              Digital Hierarchy (SDH) Control", RFC 4606, Aug 2006



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   [GMPLS-OTN-OSPF] Traffic Engineering Extensions to OSPF for
              Generalized MPLS (GMPLS)

11 Authors' Addresses

              Khuzema Pithewan
              Infinera
              140 Caspian Ct., Sunnyvale, CA 94089
              Email: kpithewan@infinera.com

              Rajan Rao
              Infinera
              140 Caspian Ct., Sunnyvale, CA 94089
              Email: rrao@infinera.com





































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