Export of MPLS Segment Routing Label Type Information in IP Flow Information Export (IPFIX)
draft-tgraf-ipfix-mpls-sr-label-type-04

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Network Working Group                                            T. Graf
Internet-Draft                                                  Swisscom
Intended status: Standards Track                          April 26, 2020
Expires: October 28, 2020

        Export of MPLS Segment Routing Label Type Information in
                   IP Flow Information Export (IPFIX)
                draft-tgraf-ipfix-mpls-sr-label-type-04

Abstract

   This document introduces additional code points in the
   mplsTopLabelType Information Element for IS-IS, OSPFv2, OSPFv3 MPLS
   Segment Routing (SR) extensions and a new SID type element to enable
   Segment Routing label and segment type information in IP Flow
   Information Export (IPFIX).

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   This Internet-Draft will expire on October 28, 2020.

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   the Trust Legal Provisions and are provided without warranty as
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  MPLS Segment Routing Top Label Type . . . . . . . . . . . . .   2
   3.  Segment Routing Segment Identifier Type . . . . . . . . . . .   3
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   3
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   5
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   5
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Introduction

   Besides BGP-4 [RFC8277], LDP [RFC5036] and BGP VPN [RFC4364], three
   new routing-protocols, OSPFv2 Extensions [RFC8665], OSPFv3 Extensions
   [RFC8666] and IS-IS Extensions [RFC8667] have been added to the list
   of routing-protocols able to propagate Segment Routing labels for the
   MPLS dataplane [RFC8660].

   Traffic Accounting in Segment Routing Networks
   [I-D.ali-spring-sr-traffic-accounting] describes how IPFIX can be
   leveraged to account traffic to MPLS Segment Routing label dimensions
   within a Segment Routing domain.

   In the Information Model for IP Flow Information Export IPFIX
   [RFC7012], the information element #46 mplsTopLabelType describes
   which MPLS control plane protocol allocated the top-of-stack label in
   the MPLS label stack.  RFC 7012 section 7.2 [RFC7012] describes the
   IANA Information Element #46 SubRegistry [IANA-IPFIX-IE46] where new
   code points should be added.

2.  MPLS Segment Routing Top Label Type

   By introducing three new code points to information element #46
   mplsTopLabelType for IS-IS, OSPFv2 and OSPFv3, when Segment Routing
   with one of these three routing protocols is deployed, we get insight
   into which traffic is being forwarded based on which MPLS control
   plane protocol.

   A typical use case scenario is to monitor MPLS control plane
   migrations from LDP to IS-IS or OSPF.  By looking at the MPLS label
   value itself, it is not always clear as to which label protocol it
   belongs, since they could potentially share the same label allocation
   range.  This is the case for IGP-Adjacency SID's and LDP as an
   example.

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3.  Segment Routing Segment Identifier Type

   The introduction of a new Information Element called SrSidType, which
   contains the Segment Routing Segment Identifier type according to
   Segment Routing Architecture [RFC8402], allows the Segment Routing
   forwarding behaviour to be exported in IPFIX.
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