IGP Flexible Algorithm Optimazition for Netwrok Slicing
draft-peng-lsr-flex-algo-opt-slicing-01

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L                                                              P. Shaofu
Internet-Draft                                                    C. Ran
Intended status: Standards Track                         ZTE Corporation
Expires: September 10, 2020                                    G. Mirsky
                                                               ZTE Corp.
                                                           March 9, 2020

        IGP Flexible Algorithm Optimazition for Netwrok Slicing
                draft-peng-lsr-flex-algo-opt-slicing-01

Abstract

   IGP Flex Algorithm proposes a solution that allows IGPs themselves to
   compute constraint based paths over the network, and it also
   specifies a way of using Segment Routing (SR) Prefix-SIDs and SRv6
   locators to steer packets along the constraint-based paths.  This
   document extends the use of the IGP Flex Algorithm to satisfy network
   slicing scenarios.

Status of This Memo

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   This Internet-Draft will expire on September 10, 2020.

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Shaofu, et al.         Expires September 10, 2020               [Page 1]
Internet-Draft             IGP FA Opt Slicing                 March 2020

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Requirements Language . . . . . . . . . . . . . . . . . . . .   3
   3.  SR Policy Using Slice-based Resources . . . . . . . . . . . .   3
   4.  SR Policy Optimaztion with IGP Flex-algo  . . . . . . . . . .   3
   5.  IGP Flex-algo Enhancement with AII  . . . . . . . . . . . . .   4
     5.1.  Enhancement for TI-LFA  . . . . . . . . . . . . . . . . .   4
     5.2.  Enhancement for Inter-domain  . . . . . . . . . . . . . .   5
     5.3.  Enhancement for L2bundles . . . . . . . . . . . . . . . .   5
   6.  AII of FAD Sub-TLV  . . . . . . . . . . . . . . . . . . . . .   6
     6.1.  ISIS AII of FAD Sub-TLV . . . . . . . . . . . . . . . . .   6
     6.2.  OSPF AII of FAD Sub-TLV . . . . . . . . . . . . . . . . .   7
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
     7.1.  ISIS IANA Considerations  . . . . . . . . . . . . . . . .   7
     7.2.  OSPF IANA Considerations  . . . . . . . . . . . . . . . .   8
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   9.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   8
   10. Normative References  . . . . . . . . . . . . . . . . . . . .   8
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   9

1.  Introduction

   IGP Flex Algorithm [I-D.ietf-lsr-flex-algo] proposes a solution that
   allows IGPs themselves to compute constraint based paths over the
   network, and it also specifies a way of using Segment Routing (SR)
   Prefix-SIDs and SRv6 locators to steer packets along the constraint-
   based paths.  It specifies a set of extensions to ISIS, OSPFv2 and
   OSPFv3 that enable a router to send TLVs that identify (a)
   calculation-type, (b) specify a metric-type, and (c )describe a set
   of constraints on the topology, that are to be used to compute the
   best paths along the constrained topology.  A given combination of
   calculation-type, metric-type, and constraints is known as an FAD
   (Flexible Algorithm Definition).

   [I-D.peng-teas-network-slicing] proposes a solution to extend the
   control plane of transport network to instantiate the Network Slice
   Instance (NSI) in transport network.  A new identifier, AII, instead
   of existing TE affinity or other identifiers, is introduced to
   represent a TN-slice and specify the dedicated resource for the TN-
   slice.

   This document extends the FAD of IGP Flex Algorithm to let IGPs