Flexible Algorithms: Bandwidth, Delay, Metrics and Constraints
draft-hegde-lsr-flex-algo-bw-con-01

Document Type Active Internet-Draft (individual)
Authors Shraddha Hegde  , William Britto  , Rejesh Shetty  , Bruno Decraene  , Peter Psenak  , Tony Li 
Last updated 2021-03-08
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SPRING                                                          S. Hegde
Internet-Draft                                                 W. Britto
Intended status: Standards Track                               R. Shetty
Expires: September 9, 2021                         Juniper Networks Inc.
                                                             B. Decraene
                                                                  Orange
                                                               P. Psenak
                                                           Cisco Systems
                                                                   T. Li
                                                         Arista Networks
                                                           March 8, 2021

     Flexible Algorithms: Bandwidth, Delay, Metrics and Constraints
                  draft-hegde-lsr-flex-algo-bw-con-01

Abstract

   Many networks configure the link metric relative to the link
   capacity.  High bandwidth traffic gets routed as per the link
   capacity.  Flexible algorithms provides mechanisms to create
   constraint based paths in IGP.  This draft documents a set of
   bandwidth related constraints to be used in Flexible Algorithms.

Requirements Language

   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 RFC 2119 [RFC2119].

Status of This Memo

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

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on September 9, 2021.

Hegde, et al.           Expires September 9, 2021               [Page 1]
Internet-Draft    Flex-Algorithm Bandwidth Constraints        March 2021

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Bandwidth Metric Advertisement  . . . . . . . . . . . . . . .   3
     2.1.  ISIS Bandwidth Metric sub-TLV . . . . . . . . . . . . . .   4
     2.2.  OSPF Bandwidth Metric sub-TLV . . . . . . . . . . . . . .   5
   3.  FAD constraint sub-TLVs . . . . . . . . . . . . . . . . . . .   5
     3.1.  ISIS FAD constraint sub-TLVs  . . . . . . . . . . . . . .   6
       3.1.1.  ISIS Exclude Minimum Bandwidth sub-TLV  . . . . . . .   6
       3.1.2.  ISIS Exclude Maximum Delay sub-TLV  . . . . . . . . .   7
     3.2.  OSPF FAD constraint sub-TLVs  . . . . . . . . . . . . . .   7
       3.2.1.  OSPF Exclude Minimum Bandwidth sub-TLV  . . . . . . .   8
       3.2.2.  OSPF Exclude Maximum Delay  sub-TLV . . . . . . . . .   8
   4.  Automatic Metric Calculation  . . . . . . . . . . . . . . . .   9
     4.1.  Automatic Metric Calculation Modes  . . . . . . . . . . .  10
       4.1.1.  Simple Mode . . . . . . . . . . . . . . . . . . . . .  10
       4.1.2.  Interface Group Mode  . . . . . . . . . . . . . . . .  10
     4.2.  Automatic Metric Calculation Methods  . . . . . . . . . .  10
       4.2.1.  Reference Bandwidth method  . . . . . . . . . . . . .  11
       4.2.2.  Bandwidth Thresholds method . . . . . . . . . . . . .  11
     4.3.  ISIS FAD constraint sub-TLVs for automatic metric
           calculation . . . . . . . . . . . . . . . . . . . . . . .  11
       4.3.1.  Reference Bandwidth sub-TLV . . . . . . . . . . . . .  11
       4.3.2.  Bandwidth Thresholds sub-TLV  . . . . . . . . . . . .  13
     4.4.  OSPF FAD constraint sub-TLVs for automatic metric
           calculation . . . . . . . . . . . . . . . . . . . . . . .  15
       4.4.1.  Reference Bandwidth sub-TLV . . . . . . . . . . . . .  15
       4.4.2.  Bandwidth Threshold sub-TLV . . . . . . . . . . . . .  17
   5.  Bandwidth metric considerations . . . . . . . . . . . . . . .  19
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