Advertising OTN Fixed Time slot constraints in OSPF

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Last updated 2019-08-16
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Network Working Group                           Vijayanand Chandrasekar
INTERNET DRAFT                                   Individual Contributor 
Intended Status: Standards Track                       August 16, 2019    
Expires:  15 Febraury, 2020                                       

            Advertising OTN Fixed Time slot constraints in OSPF 
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Vijayanand C             Expires February 2020                  [Page 1] 

INTERNET DRAFT   OTN fixed Timeslot constraints in OSPF    August 2019                
   This document describes the extensions needed to OSPF for 
   advertising the constraints that exists in some OTN switches while 
   switching timeslots between ports. This advertisement would be 
   needed for computing path of LSP through these switches taking into 
   account the above mentioned constraint.  
   This document proposes extensions to existing OSPF for advertising 
   the timeslots available on each OTN port in a new sub-tlv and the 
   connectivity matrix representing the capability of the device to 
   cross connect these timeslots in another new sub-tlv  
1. Introduction 
       In [RFC7138], a mechanism for advertising the ODU multiplexing 
   hierarchy is described. In [RFC7580], an optical node property TLV 
   is defined as an extension to the OSPF opaque LSA defined in 
       This document describes the use of OSPF-TE in carrying 
   information about the details of OTN time slots available in each 
   port of an OTN switch and the connectivity matrix describing the 
   connectivity between the timeslots of the different ports. 
2. Terminology 
   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", 
   document are to be interpreted as described in RFC2119 [RFC2110]. 
   The reader is assumed to be familiar with the terminology in 
   RFC7138[RFC7138],RFC5780[RFC7580] and RFC3630{RFC3630] 
3. OSPF Extensions 
       A new OTN timeslot sub-TLV and OTN Connectivity matrix sub-TLV 
   are proposed in this document. The OTN timeslot sub-TLV will be used 
   in conjunction with the SCSI described in section 4.1 of 
   RFC7138[RFC7138]. The OTN connectivity matrix will be carried in the 
   Optical node property TLV described in RFC7580[RFC7580]   
   3.1 OTN Timeslot 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  
      |  Type {TBD)                   |            Length             | 
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INTERNET DRAFT   OTN fixed Timeslot constraints in OSPF    August 2019                
      |Pri  | Bitmap Length           | G | BitMap(variable length)   | 
      |          BitMap(variable length)                              | 
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