Internet DRAFT - draft-fan-ccamp-gmpls-g709v5-ospf-ext

draft-fan-ccamp-gmpls-g709v5-ospf-ext



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 

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Copyright Notice 

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



 
 
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   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:  

 
 
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    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 
 
 
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   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          | 
 
 
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   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 
   | 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               | 
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 
 
 
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   |             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. 

 
 
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   [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
    





 
 
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