[mpls] An MPLS Forwarding plane for SFC

"Adrian Farrel" <adrian@olddog.co.uk> Fri, 01 September 2017 20:16 UTC

Return-Path: <adrian@olddog.co.uk>
X-Original-To: mpls@ietfa.amsl.com
Delivered-To: mpls@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 46EEC1345D0; Fri, 1 Sep 2017 13:16:06 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -0.72
X-Spam-Level:
X-Spam-Status: No, score=-0.72 tagged_above=-999 required=5 tests=[RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01] autolearn=ham autolearn_force=no
Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id hB_qTsJUrm1s; Fri, 1 Sep 2017 13:16:04 -0700 (PDT)
Received: from asmtp4.iomartmail.com (asmtp4.iomartmail.com [62.128.201.175]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id D7E9713462A; Fri, 1 Sep 2017 13:16:03 -0700 (PDT)
Received: from asmtp4.iomartmail.com (localhost.localdomain [127.0.0.1]) by asmtp4.iomartmail.com (8.13.8/8.13.8) with ESMTP id v81KG1s3012361; Fri, 1 Sep 2017 21:16:01 +0100
Received: from 950129200 (196.252.114.87.dyn.plus.net [87.114.252.196]) (authenticated bits=0) by asmtp4.iomartmail.com (8.13.8/8.13.8) with ESMTP id v81KFxMM012308 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Fri, 1 Sep 2017 21:16:00 +0100
Reply-To: adrian@olddog.co.uk
From: Adrian Farrel <adrian@olddog.co.uk>
To: mpls@ietf.org
Cc: 'Service Function Chaining IETF list' <sfc@ietf.org>
Date: Fri, 01 Sep 2017 21:15:55 +0100
Message-ID: <034601d3235f$1f4ef590$5dece0b0$@olddog.co.uk>
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
X-Mailer: Microsoft Outlook 14.0
Thread-Index: AdMjXxXVPkarGltYRZ25UDV5w+jgOg==
Content-Language: en-gb
X-TM-AS-MML: disable
X-TM-AS-Product-Ver: IMSS-7.1.0.1679-8.1.0.1062-23298.002
X-TM-AS-Result: No--16.848-10.0-31-10
X-imss-scan-details: No--16.848-10.0-31-10
X-TMASE-MatchedRID: s5lflZVXy+ZdFN0T1voizwRH1Nr7oERdcWZEfrt7JgVF+YXPIqAdvtF9 Hu8OfKbWQx95p3GYmc/AC7+rw+mMJbmolwcqE3SPW7gz/Gbgpl636GGfwjLoZdp1biJhIyNRXa2 +zE1cP+XqgbAe9UXHYTtCUTQMBxXLSqSDOjH8JBoIs18ZTh19+PZpw431D6uejNnoU1fopouvlw fovn4a7yqg0Odi2Lp/iiEcPaOOWNzQo7lIbG5ppK3SxRSke3bpu2rcU2ygxCANmPMcsvd5Fs3ME 4JSKf6jrDjAIIFu3L08yni6U6vewrgSigd+50bagOqr/r0d+CwPaWzG/2S2hszvOkSymob/82+Z JoKeNOWwFvdDQcRRfAWfBtlFpK+pDPIzF4wRfrA5f9Xw/xqKXcidYBYDjITptrNGq+WQEvSrusV Ry4an8axZXRt2R/g5SBqPG8a7OaHWfgjv2uk3CcCRpca5b8H1SYMTiex1I1HWXIi/kfJ6sTZkpf QZUdh4
Archived-At: <https://mailarchive.ietf.org/arch/msg/mpls/WSfU5MkhylWCYrKLOmFdbCay1TA>
Subject: [mpls] An MPLS Forwarding plane for SFC
X-BeenThere: mpls@ietf.org
X-Mailman-Version: 2.1.22
Precedence: list
List-Id: Multi-Protocol Label Switching WG <mpls.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/mpls>, <mailto:mpls-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/mpls/>
List-Post: <mailto:mpls@ietf.org>
List-Help: <mailto:mpls-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/mpls>, <mailto:mpls-request@ietf.org?subject=subscribe>
X-List-Received-Date: Fri, 01 Sep 2017 20:16:06 -0000

Hi,

We've been working up some ideas for using an MPLS forwarding plane (switching
or SR) for SFC.

We have constrained ourselves to the architecture developed by the SFC working
group, and have used the NSH as a functional model.

MPLS is somewhat limited compared to the NSH encapsulation, so there is a
trade-off between using a new encapsulation with full function and a good set of
function using an existing forwarding plane.

At the moment this is an early version of our work, but we thought you'd like to
see our thought processes.

(FWIW draft-ietf-bess-nsh-bgp-control-plane is applicable to NSH or MPLS
encapsulations and includes mechanisms to select between the two.)

Cheers,
Adrian

> -----Original Message-----
> From: I-D-Announce [mailto:i-d-announce-bounces@ietf.org] On Behalf Of
> internet-drafts@ietf.org
> Sent: 01 September 2017 21:00
> To: i-d-announce@ietf.org
> Subject: I-D Action: draft-farrel-mpls-sfc-00.txt
> 
> 
> A New Internet-Draft is available from the on-line Internet-Drafts
directories.
> 
> 
>         Title           : An MPLS-Based Forwarding Plane for Service Function
Chaining
>         Authors         : Adrian Farrel
>                           Stewart Bryant
>                           John Drake
> 	Filename        : draft-farrel-mpls-sfc-00.txt
> 	Pages           : 23
> 	Date            : 2017-09-01
> 
> Abstract:
>    Service Function Chaining (SFC) is the process of directing packets
>    through a network so that they can be acted on by an ordered set of
>    abstract service functions before being delivered to the intended
>    destination.  An architecture for SFC is defined in RFC7665.
> 
>    The Network Service Header (NSH) can be inserted into packets to
>    steer them along a specific path to realize a Service Function Chain.
> 
>    Multiprotocol Label Switching (MPLS) is a widely deployed forwarding
>    technology that uses labels to identify the forwarding actions to be
>    taken at each hop through a network.  Segment Routing is a mechanism
>    that provides a source routing paradigm for steering packets in an
>    MPLS network.
> 
>    This document describes how Service Function Chaining can be achieved
>    in an MPLS network by means of a logical representation of the NSH in
>    an MPLS label stack.
> 
> 
> 
> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc/draft-farrel-mpls-sfc/
> 
> There are also htmlized versions available at:
> https://tools.ietf.org/html/draft-farrel-mpls-sfc-00
> https://datatracker.ietf.org/doc/html/draft-farrel-mpls-sfc-00
> 
> 
> Please note that it may take a couple of minutes from the time of submission
> until the htmlized version and diff are available at tools.ietf.org.
> 
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
> 
> _______________________________________________
> I-D-Announce mailing list
> I-D-Announce@ietf.org
> https://www.ietf.org/mailman/listinfo/i-d-announce
> Internet-Draft directories: http://www.ietf.org/shadow.html
> or ftp://ftp.ietf.org/ietf/1shadow-sites.txt