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Network Working Group                                     P. Sarkar, Ed.
Internet-Draft                                                  K. Patel
Intended status: Informational                              Arrcus, Inc.
Expires: December 4, 2020                                  S. Pallagatti
                                                                  VMware
                                                                 B. Saji
                                                         Arista Networks
                                                            June 2, 2020


       BGP Shortest Path Routing Extension Implementation Report
                   draft-psarkar-lsvr-bgp-spf-impl-00

Abstract

   This document is an implementation report for the Shortest Path
   Routing Extensions to BGP protocol as defined in
   [I-D.ietf-lsvr-bgp-spf].  The authors did not verify the accuracy of
   the information provided by respondents.  The respondents are experts
   with the implementations they reported on, and their responses are
   considered authoritative for the implementations for which their
   responses represent.  The respondents were asked to only use the
   "YES" answer if the feature had at least been tested in the lab.

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
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on December 4, 2020.





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Copyright Notice

   Copyright (c) 2020 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Implementation Forms  . . . . . . . . . . . . . . . . . . . .   3
   3.  BGP-LS-SPF Peering Models . . . . . . . . . . . . . . . . . .   3
   4.  Extensions to BGP-LS  . . . . . . . . . . . . . . . . . . . .   4
   5.  Support for Simplified Decision Process . . . . . . . . . . .   4
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   5
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   5
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .   5
     9.2.  Informative References  . . . . . . . . . . . . . . . . .   6
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Introduction

   [I-D.ietf-lsvr-bgp-spf] describes an alternative solution which
   leverages BGP-LS [RFC7752] and the Shortest Path First algorithm
   similar to Internal Gateway Protocols (IGPs) such as OSPF [RFC2328].
   The solution introduces an new BGP-LS-SPF AFI-SAFI and replaces the
   Phase 1 and 2 decision functions of the Decision Process specifed by
   [RFC4271] with the Shortest Path First (SPF) algorithm also known as
   the Dijkstra algorithm.  This solution avails the benefits of both
   BGP and SPF-based IGPs that include TCP based flow-control, no
   periodic link-state refresh, and completely incremental NLRI
   advertisements.  These advantages can reduce the overhead in MSDCs
   where there is a high degree of Equal Cost Multi- Path (ECMPs) and
   the topology is very stable.  Additionally, using an SPF-based
   computation can support fast convergence and the computation of Loop-
   Free Alternatives (LFAs) [RFC5286] in the event of link failures.





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   This document provides an implementation report of the Shortest Path
   Routing extensions to BGP protocol as specified in
   [I-D.ietf-lsvr-bgp-spf].

   The authors did not verify the accuracy of the information provided
   by respondents or by any alternative means.  The respondents are
   experts with the implementations they reported on, and their
   responses are considered authoritative for the implementations for
   which their responses represent.  Respondents were asked to only use
   the "YES" answer if the feature had at least been tested in the lab.

2.  Implementation Forms

   Contact and implementation information for person filling out this
   form:


       ArcOS
           Name: Pushpasis Sarkar
           Email: pushpasis@arrcus.com
           Vendor: Arrcus, Inc.
           Release: ArcOS
           Protocol Role: Route Reflector and Client

       FRR
           Name: Basil Saji
           Email: sajibasil@gmail.com
           Vendor: FRR
           Release:
           Protocol Role: Route Reflector

           Name: Santosh P K
           Email: santosh.pallagatti@gmail.com
           Vendor: FRR
           Release:
           Protocol Role: Route Reflector



                                 Figure 1

3.  BGP-LS-SPF Peering Models

   Does the implementation support the following BGP-LS-SPF Peering
   Models as specified in Section 2 of [I-D.ietf-lsvr-bgp-spf]?

   o  2.1 -- BGP Single-Hop Peering on Network Node Connections




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   o  2.2 -- BGP Peering Between Directly Connected Network Nodes

   o  2.3 -- BGP Peering in Route-Reflector or Controller Topology

   +----------+-----+-----+----------------------------+
   | Reelease | 2.1 | 2.2 | 2.3                        |
   +----------+-----+-----+----------------------------+
   | ArcOS    | Yes | Yes | Yes (Route Reflector only) |
   | FRR      | Yes | Yes | Yes                        |
   +----------+-----+-----+----------------------------+

                      Table 1: Peering Model Support

4.  Extensions to BGP-LS

   Does the implementation support the following BGP-LS-SPF TLVs as
   described in Section 4 and sub-sections of [I-D.ietf-lsvr-bgp-spf]??

   o  T1 -- Node NLRI Attribute SPF Capability TLV

   o  T2 -- Node/Link/Prefix NLRI Attribute SPF Status TLV

   o  T3 -- Link NLRI Attribute IPv4 Prefix-Length TLV

   o  T4 -- Link NLRI Attribute IPv6 Prefix-Length TLV

   o  T5 -- Attribute Sequence-Number TLV

   +---------+-------------+-----+-----+-----+-----+-----+
   | Release | Send / Recv | T1  | T2  | T3  | T4  | T5  |
   +---------+-------------+-----+-----+-----+-----+-----+
   | ArcOS   | Send        | Yes | Yes | Yes | Yes | Yes |
   |         | Recv        | Yes | Yes | Yes | Yes | Yes |
   | FRR     | Send        | Yes | Yes | Yes | Yes | Yes |
   |         | Recv        | Yes | Yes | Yes | Yes | Yes |
   +---------+-------------+-----+-----+-----+-----+-----+

                  Table 2: BGP-LS Extension TLVs Support

5.  Support for Simplified Decision Process

   Does the implementation support the following Best Path Decision
   processes as described in Section 5 and sub-sections of
   [I-D.ietf-lsvr-bgp-spf]?

   o  P1 -- Phase-1 BGP NLRI Selection

   o  P2 -- Dual Stack Support



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   o  P3 -- SPF Calculation based on BGP-LS NLRI

   +---------+-----+-----+-----+
   | Release | P1  | P2  | P3  |
   +---------+-----+-----+-----+
   | ArcOS   | Yes | Yes | Yes |
   | TBA     | --- | --- | --- |
   +---------+-----+-----+-----+

                     Table 3: Decision Process Support

6.  Acknowledgements

   TBA

7.  IANA Considerations

   N/A. - No protocol changes are proposed in this document.

8.  Security Considerations

   This document does not introduce any change in any of the protocol
   specifications.

9.  References

9.1.  Normative References

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119,
              DOI 10.17487/RFC2119, March 1997,
              <https://www.rfc-editor.org/info/rfc2119>.

   [RFC2328]  Moy, J., "OSPF Version 2", STD 54, RFC 2328,
              DOI 10.17487/RFC2328, April 1998,
              <https://www.rfc-editor.org/info/rfc2328>.

   [RFC4271]  Rekhter, Y., Ed., Li, T., Ed., and S. Hares, Ed., "A
              Border Gateway Protocol 4 (BGP-4)", RFC 4271,
              DOI 10.17487/RFC4271, January 2006,
              <https://www.rfc-editor.org/info/rfc4271>.

   [RFC5286]  Atlas, A., Ed. and A. Zinin, Ed., "Basic Specification for
              IP Fast Reroute: Loop-Free Alternates", RFC 5286,
              DOI 10.17487/RFC5286, September 2008,
              <https://www.rfc-editor.org/info/rfc5286>.





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   [RFC5331]  Aggarwal, R., Rekhter, Y., and E. Rosen, "MPLS Upstream
              Label Assignment and Context-Specific Label Space",
              RFC 5331, DOI 10.17487/RFC5331, August 2008,
              <https://www.rfc-editor.org/info/rfc5331>.

   [RFC7752]  Gredler, H., Ed., Medved, J., Previdi, S., Farrel, A., and
              S. Ray, "North-Bound Distribution of Link-State and
              Traffic Engineering (TE) Information Using BGP", RFC 7752,
              DOI 10.17487/RFC7752, March 2016,
              <https://www.rfc-editor.org/info/rfc7752>.

9.2.  Informative References

   [I-D.ietf-lsvr-bgp-spf]
              Patel, K., Lindem, A., Zandi, S., and W. Henderickx,
              "Shortest Path Routing Extensions for BGP Protocol",
              draft-ietf-lsvr-bgp-spf-08 (work in progress), March 2020.

Authors' Addresses

   Pushpasis Sarkar (editor)
   Arrcus, Inc.
   Bangalore, KA  562125
   India

   Email: pushpasis.ietf@gmail.com


   Keyur Patel
   Arrcus, Inc.

   Email: keyur@arrcus.com


   Santosh
   VMware

   Email: santosh.pallagatti@gmail.com


   Basil
   Arista Networks

   Email: sajibasil@gmail.com







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