[Docs] [txt|pdf] [Tracker] [Email] [Nits]

Versions: 00

CCAMP Working Group                                            Zheyu Fan
Internet-Draft                                                    Huawei
Intended status: Standards Track

Expires: September 10, 2017                               March 10, 2017


 GMPLS Routing Extension for Optical Transport Networks with Beyond 100G
                           in G.709 Edition 5

               draft-fan-ccamp-gmpls-g709v5-ospf-ext-00.txt


Abstract

   The International Telecommunication Union Telecommunication
   Standardization Sector (ITU-T) has extended the Recommendation G.709
   to support beyond 100G (B100G) features. Corresponding Open Shortest
   Path First - Traffic Engineering (OSPF-TE) routing protocol
   extensions are included in this document.

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
   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."

   The list of current Internet-Drafts can be accessed at
   http://www.ietf.org/ietf/1id-abstracts.txt.

   The list of Internet-Draft Shadow Directories can be accessed at
   http://www.ietf.org/shadow.html.

  This Internet-Draft will expire on September 10, 2017.

Copyright Notice

   Copyright (c) 2017 IETF Trust and the persons identified as the
   document authors.  All rights reserved.



Fan                    Expires September 2017                 [Page 1]


draft-fan-ccamp-gmpls-g709v5-ospf-ext-00.txt                March, 2017


   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
   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 ................................................ 2
   2. Terminology ................................................. 2
   3. OSPF-TE Extensions for B100G ................................ 3
   4. ISCD Format Extensions for B100G ............................ 3
      4.1. Switching Capability Specific Information .............. 3
      4.2. Supporting of OTUCn sub rates (OTUCn-M) ................ 6
   5. Security Considerations ..................................... 7
   6. IANA considerations ......................................... 7
   7. References .................................................. 7
      7.1. Normative References ................................... 7
      7.2. Informative References ................................. 8
   Authors' Addresses ............................................. 8



   1. Introduction

   G.709 [G.709-2016] defines the interfaces to Optical Transport
   Network (OTN) and includes new features to support beyond 100G
   (B100G). In order to advertise this information in routing, this
   document extends the encoding specific to OTN technology for use in
   GMPLS OSPF-TE as defined in [RFC7138].

   Routing information for Optical Channel (OCh) layer is beyond the
   scope of this document. Please refer to [RFC6163] and [RFC6566] for
   further information.

   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].





Fan                    Expires September 2017                 [Page 2]


draft-fan-ccamp-gmpls-g709v5-ospf-ext-00.txt                March, 2017


   3. OSPF-TE Extensions for B100G

   As discussed in [GMPLSv5-fwk], OSPF-TE must be extended to be able
   to advertise the 5G Tributary Slot Granularity, the multiplexing
   capabilities of ODUCn connection requests, and the support
   information of OTUCn sub rates (OTUCn-M).



   4. ISCD Format Extensions for B100G

   As defined in [RFC4203], the ISCD describes the Switching Capability
   of an interface. [RFC7138] defines a new Switching Capability value
   for OTN.

   4.1. Switching Capability Specific Information

   [RFC7138] defines Bandwidth sub-TLVs for the technology-specific
   part of the OTN-TDM ISCD and considers two types of Bandwidth sub-
   TLVs, unreserved bandwidth for fixed containers (Type 1) and
   unreserved bandwidth for flexible containers (Type 2). In order to
   support B100G features in OTN, a new signal type value for ODUCn is
   defined in [GMPLSv5-signal]. ODUCn can represent different fixed bit
   rates for different values of n. Like ODUk signals, an ODUCn signal
   occupies fixed bandwidth which does not change over time. Type 1
   Bandwidth sub-TLV can be extended to advertise the value of n for
   ODUCn signal type.

   As discussed in [GMPLSv5-fwk], OTUCn-M link carries ODUCn signal as
   OTUCn does, e.g. OTUC3-50 link supporting 250 Gbps bandwidth carries
   an ODUC3 signal and OTUC3 link supporting 300 Gbps bandwidth also
   carries an ODUC3 signal. In order to distinguish the ODUCn signals
   in OTUCn-M link from that in OTUCn link, Type 1 Bandwidth sub-TLV
   must be able to advertise the number of available Tributary Slots
   for ODUCn signal type.

   As only ODUCn signal type is with 5-Gbps TS granularity, Signal Type
   being ODUCn can indicate that the TS granularity is 5 Gbps and extra
   definition for TS granularity is not needed.

   This document extends the Type 1 Bandwidth sub-TLV to advertise the
   value of n, the number of available Tributary Slots, and the
   Tributary Slot Granularity for ODUCn signal type.

   The format of extended Bandwidth sub-TLV for Type 1 containers is
   depicted in the following figure:



Fan                    Expires September 2017                 [Page 3]


draft-fan-ccamp-gmpls-g709v5-ospf-ext-00.txt                March, 2017


    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 (Unres-fix)   |            Length             |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |  Signal Type  | Num of stages |T|S| TSG | Res |    Priority   |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   ~    Stage#1    |      ...      |    Stage#N    |    Padding    ~
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |  Unreserved ODUCn at Prio 0   |             ......            |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |  Unreserved ODUCn at Prio 7   |     Unreserved Padding        |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |       n       |    Reserved   |          Num of TS            |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

      Figure 1: extended Bandwidth sub-TLV for Type 1 containers

   TSG (3 bits): Tributary Slot Granularity. TSG MUST be set to 0
   (Ignored) when Signal Type is ODUCn.

   Stage (8 bits): in extreme case (e.g. ODU0->ODU1->ODU2->ODU3->ODU4-
   >ODUC1), the number of stages can be 5, thus stage fields can occupy
   two rows.

   n (8 bits): the number of client data entities for ODUCn. When
   Signal Type is not ODUCn, n MUST be set to 0 and ignored on receipt.

   Reserved (8 bits): this field is reserved and MUST be set to 0 and
   ignored on receipt.

   Num of TS (16 bits): the number of 5-Gbps TS that ODUCn can occupy
   to support OTUCn-M link. If a particular value of M is not indicated
   in OTUCn-M link, the signal contains 20*n 5-Gbps TS. When Signal
   Type is not ODUCn, this field MUST be set to 0 and ignored on
   receipt.

   Note that the above three fields (n, Reserved, and Num of TS fields)
   are useful only when Signal Type is ODUCn. When Signal Type is not
   ODUCn, these three fields MUST be omitted.

   The values of rest fields are the same as defined in Section 4.1.3
   of [RFC7138].

   The following example shows the multiplexing to ODUCn. In this
   example, an OTUC1 component link is considered with multiplexing
   hierarchy ODU0->ODU1->ODU2->ODU3->ODU4->ODUC1 and with supported


Fan                    Expires September 2017                 [Page 4]


draft-fan-ccamp-gmpls-g709v5-ospf-ext-00.txt                March, 2017


   priorities 0 and 2. The T and S fields are not relevant to this
   example and filled with Xs.

    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 (Unres-fix)   |          Length = 12          |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | Sig type=ODUCn|  #stages = 0  |X|X|TSG=0|0 0 0|1|0|1|0|0|0|0|0|
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |   Unres ODUCn at Prio 0 = 1   |   Unres ODUCn at Prio 2 = 1   |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |     n = 1     |0 0 0 0 0 0 0 0|         Num of TS = 20        |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |        Type = 1 (Unres-fix)   |          Length = 12          |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | Sig type=ODU4 |  #stages = 1  |X|X|TSG=3|0 0 0|1|0|1|0|0|0|0|0|
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | Stage#1=ODUCn |               Padding (all zeros)             |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |   Unres ODU4 at Prio 0 = 1    |   Unres ODU4 at Prio 2 = 1    |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |        Type = 1 (Unres-fix)   |          Length = 12          |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | Sig type=ODU3 |  #stages = 2  |X|X|TSG=1|0 0 0|1|0|1|0|0|0|0|0|
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |  Stage#1=ODU4 | Stage#2=ODUCn |      Padding (all zeros)      |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |   Unres ODU3 at Prio 0 = 2    |   Unres ODU3 at Prio 2 = 2    |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |        Type = 1 (Unres-fix)   |          Length = 12          |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | Sig type=ODU2 |  #stages = 3  |X|X|TSG=1|0 0 0|1|0|1|0|0|0|0|0|
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |  Stage#1=ODU3 |  Stage#2=ODU4 | Stage#3=ODUCn |    Padding    |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |   Unres ODU2 at Prio 0 = 10   |   Unres ODU2 at Prio 2 = 10   |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |        Type = 1 (Unres-fix)   |          Length = 12          |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | Sig type=ODU1 |  #stages = 4  |X|X|TSG=1|0 0 0|1|0|1|0|0|0|0|0|
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |  Stage#1=ODU2 |  Stage#2=ODU3 |  Stage#3=ODU4 | Stage#4=ODUCn |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |   Unres ODU1 at Prio 0 = 4    |   Unres ODU1 at Prio 2 = 4    |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |        Type = 1 (Unres-fix)   |          Length = 16          |


Fan                    Expires September 2017                 [Page 5]


draft-fan-ccamp-gmpls-g709v5-ospf-ext-00.txt                March, 2017


   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | Sig type=ODU0 |  #stages = 5  |X|X|TSG=0|0 0 0|1|0|1|0|0|0|0|0|
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | Stage#1=ODU1  |  Stage#2=ODU2 |  Stage#3=ODU3 |  Stage#4=ODU4 |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | Stage#5=ODUCn |               Padding (all zeros)             |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |   Unres ODU0 at Prio 0 = 2    |   Unres ODU0 at Prio 2 = 2    |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

                    Figure 2: Multiplexing to ODUC1



   4.2. Supporting of OTUCn sub rates (OTUCn-M)

   The OTUCn-M frame is a type of OTUCn frame which contains n
   instances of OTUC, ODUC and OPUC overhead and M 5-Gbit/s OPUCn
   tributary slots. If a particular value of M is not indicated, the
   frame contains 20*n tributary slots.

   For path computation, OTUCn-M link can provide a bandwidth which is
   not an integral multiple of the bandwidth of OTUC1. The MAX LSP
   Bandwidth field and SCSI field for ODUCn signal in ISCD shall be
   configured as the capacity of OTUCn-M can provide.

   The following example illustrates the MAX LSP Bandwidth fields of
   the ISCD for OTUCn-M link and the Bandwidth sub-TLV for ODUCn signal.
   In this example, an OTUC2-30 link is considered with supported
   priorities 0 and 2. The T and S fields are not relevant to this
   example and filled with Xs.

    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
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | SwCap=OTN_TDM | Encoding = 12 |    Reserved (all zeros)       |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |             MAX LSP Bandwidth at priority 0 = 150 Gbps        |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |             MAX LSP Bandwidth at priority 1 = 0               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |             MAX LSP Bandwidth at priority 2 = 150 Gbps        |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |             MAX LSP Bandwidth at priority 3 = 0               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |             MAX LSP Bandwidth at priority 4 = 0               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


Fan                    Expires September 2017                 [Page 6]


draft-fan-ccamp-gmpls-g709v5-ospf-ext-00.txt                March, 2017


   |             MAX LSP Bandwidth at priority 5 = 0               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |             MAX LSP Bandwidth at priority 6 = 0               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |             MAX LSP Bandwidth at priority 7 = 0               |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |             Switching Capability Specific Information         |
   |                        (variable length)                      |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

               Figure 3: ISCD for ODUC2 in OTUC2-30 link



   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |        Type = 1 (Unres-fix)   |          Length = 12          |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   | Sig type=ODUCn|  #stages = 0  |X|X|TSG=0|0 0 0|1|0|1|0|0|0|0|0|
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |   Unres ODUCn at Prio 0 = 1   |   Unres ODUCn at Prio 2 = 1   |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |     n = 2     |    Reserved   |         Num of TS = 30        |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

                  Figure 4: ODUC2 in OTUC2-30 link



   5. Security Considerations

   This document does not introduce any new security considerations to
   the existing OSPF-TE protocols. Refer to [RFC7138] for further
   details of the specific security measures. Additionally, [RFC5920]
   provides an overview of security vulnerabilities and protection
   mechanisms for the GMPLS control plane.

   6. IANA considerations

   TBD.

   7. References

   7.1. Normative References

   [G.709-2016] ITU-T, "Interface for the Optical Transport Network
             (OTN)", G.709/Y.1331 Recommendation, June 2016.



Fan                    Expires September 2017                 [Page 7]


draft-fan-ccamp-gmpls-g709v5-ospf-ext-00.txt                March, 2017


   [RFC2119] S. Bradner, "Key words for use in RFCs to indicate
             requirements levels", RFC 2119, March 1997.

   [RFC4203] K. Kompella, Y. Rekhter, 'OSPF Extensions in Support of
             Generalized Multi-Protocol Label Switching (GMPLS)',
             RFC4203, October 2005.

   [RFC5920] L. Fang, 'Security Framework for MPLS and GMPLS Networks',
             RFC5920, July 2010.

   [RFC6163] Y. Lee, G. Bernstein, W. Imajuku, 'Framework for GMPLS and
             Path Computation Element (PCE) Control of Wavelength
             Switched Optical Networks (WSONs)', RFC6163, April 2011.

   [RFC6566] Y. Lee, G. Bernstein, D. Li, G. Martinelli, 'A Framework
             for the Control of Wavelength Switched Optical Networks
             (WSONs) with Impairments', RFC6566, March 2012.

   [RFC7138] D. Ceccarelli, F. Zhang, S. Belotti, R. Rao, J. Drake,
             'Traffic Engineering Extensions to OSPF for GMPLS Control
             of Evolving G.709 Optical Transport Networks', RFC7138,
             March 2014.

   [GMPLSv5-fwk] H. Zheng, I. Busi, Z. Ali, S. Belotti, D. Ceccarelli,
             D. King, 'Framework for GMPLS Control of Optical Transport
             Networks in G.709 Edition 5', Work in Progress, March 2017.

   [GMPLSv5-signal] H. Zheng, I. Busi, Z. Ali, D. Ceccarelli, D. King,
             'GMPLS Signaling Extension for Optical Transport Networks
             with Beyond 100G in G.709 Edition 5', Work in Progress,
             March 2017.

   7.2. Informative References



   Authors' Addresses

   Zheyu Fan
   Huawei Technologies
   Email: fanzheyu2@huawei.com








Fan                    Expires September 2017                 [Page 8]


Html markup produced by rfcmarkup 1.124, available from https://tools.ietf.org/tools/rfcmarkup/