Traffic Accounting in Segment Routing Networks
draft-ali-spring-sr-traffic-accounting-02

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Last updated 2018-06-07
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SPRING Working Group                                      Z. Ali 
Internet-Draft                                       C. Filsfils 
Intended status: Informational                     K. Talaulikar 
Expires: December 6, 2018                         Siva Sivabalan            
                                              Cisco Systems, Inc. 
                                                    M. Horneffer           
                                                Deutsche Telekom 
                                                       R. Raszuk 
                                                    Bloomberg LP 
                                                    S. Litkowski 
                                        Orange Business Services 
                                                        D. Voyer 
                                                       R. Morton 
                                                     Bell Canada 
                                                        G. Dawra
                                                        LinkedIn
                                                    June 7, 2018 
           
         Traffic Accounting in Segment Routing Networks
        draft-ali-spring-sr-traffic-accounting-02.txt 

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This Internet-Draft will expire on Expires December 6, 2018. 
 
Ali, et al.         Expires December 6, 2018               [Page 1]
Internet-Draft      SR Traffic Accounting                 March 2018

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Abstract 
 
Capacity planning is the continuous art of forecasting traffic 
load and failures to evolve the network topology, its capacity, 
and its routing to meet a defined Service-Level Agreement (SLA). 
This document takes a holistic view of network capacity planning 
and identifies the role of traffic accounting in network 
operation and capacity planning, without creating any additional 
states in the SR fabric. 
 
Table of Contents 

   1  Introduction...................................................2 
   2  SR Traffic Counters............................................4 
   3  SR Traffic Matrix (TM).........................................4 
      3.1  TM Border ................................................4 
      3.1  Choosing TM Border .......................................5 
      3.2  Deriving Demand Matrix ...................................5 
      3.1  Traffic Matrix Counters ..................................5 
   4  Internet Protocol Flow Information Export (IPFIX)..............6 
   5  Segment Routing Traffic Accounting.............................6 
   6  Security Considerations........................................8 
   7  IANA Considerations............................................8 
   8  References.....................................................8 
      8.1  Normative References .....................................8 
      7.2............................................................9 
   9  Acknowledgments................................................9 
   10   Contributors ................................................9 
 

1  Introduction 
 
Capacity planning is the continuous art of forecasting traffic 
load and failures to evolve the network topology, its capacity, 
and its routing to meet a defined Service-Level Agreement (SLA). 
This document takes a holistic view of traffic accounting and 
its role in operation and capacity planning in Segment Routing 
(SR) networks.  
 
One of the main architecture principles of Segment Routing (SR) 
is that it maintains per-flow states only at the ingress nodes 

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