From dmm@1-4-5.net Fri Nov 1 09:25:07 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C741411E810E for ; Fri, 1 Nov 2013 09:25:07 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.977 X-Spam-Level: X-Spam-Status: No, score=-2.977 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id RSH0aRtLca89 for ; Fri, 1 Nov 2013 09:25:02 -0700 (PDT) Received: from mail-ob0-f174.google.com (mail-ob0-f174.google.com [209.85.214.174]) by ietfa.amsl.com (Postfix) with ESMTP id 19D0921E80E8 for ; Fri, 1 Nov 2013 09:24:58 -0700 (PDT) Received: by mail-ob0-f174.google.com with SMTP id vb8so4776803obc.33 for ; Fri, 01 Nov 2013 09:24:57 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:date:message-id:subject:from:to :content-type; bh=21bTB753KFc4LwDDLahaHhIGe97loJjrbFx1RmmhOhw=; b=R6Yk/s+/8vZ57xLfqkzuUH5D+AVJWbYfkAMFuz56uDlf2YuyGbHDBy7XyCGgOMgnTe jbXZWQXNftmvWM9Kl3hpBGtjLz5Wmvxry/Uu/ug2YosSj+HYYiPtPPDpLjiXe19y2sKP H9kvevgiR3whaqznuAi2CdcjkOJnWc0lzrXGrlk54/fGAZUXstRiYDSjmYE7gcwj3skT tg4fZZYl1VhFUGBlI5Vnk0EpTDR5lxLWg4HVSCPc0nUBB+4ALipajAmmUN2JA3ySl+fO NSlq0jYZinIXwlr4uJf6utz9YC1LjLX43i8Mh1Rm3+QJrGjEZXofqgudpXfaALFZNx6F zBAg== X-Gm-Message-State: ALoCoQlic1WmANVYOCgvM43wiBWSBoEt5eCBdXgYnrWFzgeAKiteqovBsxTCzmu5HOF1qevoEt7q MIME-Version: 1.0 X-Received: by 10.182.61.8 with SMTP id l8mr896243obr.88.1383323097531; Fri, 01 Nov 2013 09:24:57 -0700 (PDT) Received: by 10.182.66.168 with HTTP; Fri, 1 Nov 2013 09:24:57 -0700 (PDT) X-Originating-IP: [2001:468:d01:9c::80df:9cfd] Date: Fri, 1 Nov 2013 09:24:57 -0700 Message-ID: From: David Meyer To: SDN IRTF list Content-Type: text/plain; charset=ISO-8859-1 Subject: [Sdn] still missing slides from a few presenters X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 01 Nov 2013 16:25:07 -0000 Please get your slides to me as soon as possible (if you haven't already). Thanks, --dmm From sarlimatti@gmail.com Sat Nov 2 05:06:26 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 36BF121E80C9 for ; Sat, 2 Nov 2013 05:06:26 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.392 X-Spam-Level: X-Spam-Status: No, score=-1.392 tagged_above=-999 required=5 tests=[AWL=1.207, BAYES_00=-2.599, HTML_MESSAGE=0.001, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id kMkDtmWwgQcl for ; Sat, 2 Nov 2013 05:06:25 -0700 (PDT) Received: from mail-pb0-x235.google.com (mail-pb0-x235.google.com [IPv6:2607:f8b0:400e:c01::235]) by ietfa.amsl.com (Postfix) with ESMTP id A071021E80BE for ; Sat, 2 Nov 2013 05:06:25 -0700 (PDT) Received: by mail-pb0-f53.google.com with SMTP id up7so5310603pbc.26 for ; Sat, 02 Nov 2013 05:06:21 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:date:message-id:subject:from:to:content-type; bh=I+8qbBCeHOiLIfPWTl/chIJHAXCMz0jlBLu9pI+JKYQ=; b=R9ZdDAWbj+BBQNYXKoDSka1Fbu9NbIuoABLELWicXnPmXx4nw5PbainU/FboRifwee oWO/CaJuYBGk1ey42LlnzxD+0UQLoU8J8NqMfTtfq31BfaXvNOSBJd0k8a1u68iG53+t Gm6W5KALIrVuYZsUMKt3Ji1KYyYBGMQKRgB5vdBOgFZDA2HLDTdfKDaNRY+SOpZIggXd bMDDEOWpNVs8ARIBvFKuQ8APwVZ40h9gSszqvOclohxVf4RjQW3rXd8J2dNNZhFANrId mpAUGtBViaXKZ8AeMBRfwPHNJ/6GMoSU9QgJf5BQMqgiUAy8rsQAktHxo/EE4fdBG2fw H5sQ== MIME-Version: 1.0 X-Received: by 10.68.96.130 with SMTP id ds2mr7848538pbb.99.1383393981359; Sat, 02 Nov 2013 05:06:21 -0700 (PDT) Received: by 10.70.28.161 with HTTP; Sat, 2 Nov 2013 05:06:21 -0700 (PDT) Date: Sat, 2 Nov 2013 20:06:21 +0800 Message-ID: From: Shivleela Arlimatti To: sdn@irtf.org Content-Type: multipart/alternative; boundary=047d7b67643ad7ede304ea3082d3 Subject: [Sdn] hi X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 02 Nov 2013 12:06:26 -0000 --047d7b67643ad7ede304ea3082d3 Content-Type: text/plain; charset=ISO-8859-1 hai, I am new to all this.. please guide me also.. what is this scribe. and even i want to see slides.. Shivaleela Arlimatti Research scholar, InterNetworks Research Lab, CAS UUM Sintok, Malaysia. --047d7b67643ad7ede304ea3082d3 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
hai,
=A0 =A0I am new to all this.. please guide me als= o.. what is this scribe. and even i want to see slides..
=A0
Shivaleela Arlimatti
Research scholar,=
InterNetworks Research Lab, CAS
UUM Sintok, Malaysia.=A0
--047d7b67643ad7ede304ea3082d3-- From sarlimatti@gmail.com Sat Nov 2 05:11:29 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id CB53011E8118 for ; Sat, 2 Nov 2013 05:11:29 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.996 X-Spam-Level: X-Spam-Status: No, score=-1.996 tagged_above=-999 required=5 tests=[AWL=0.604, BAYES_00=-2.599, HTML_MESSAGE=0.001, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id qpvF36q-DBDU for ; Sat, 2 Nov 2013 05:11:28 -0700 (PDT) Received: from mail-pa0-x22c.google.com (mail-pa0-x22c.google.com [IPv6:2607:f8b0:400e:c03::22c]) by ietfa.amsl.com (Postfix) with ESMTP id 67B0A21E80C2 for ; Sat, 2 Nov 2013 05:11:28 -0700 (PDT) Received: by mail-pa0-f44.google.com with SMTP id fb1so5153325pad.31 for ; Sat, 02 Nov 2013 05:11:28 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; bh=eznvq6ARrZgLuCXiHZSc5Obbo68IPLrNp640FbZqcYw=; b=mwfyj6wytpgmtE+M99SfuXKJPBhqDYK/IXTQM7dqUvjPWXEZTHeF3Ditr/pZt71MYZ kdsB0fnFLGaxsz1Gvr4uPkaG2MntraDsLFUgD6/NA62ZkUdEiehqOgL1fh8y9wumoBoU r07ffB+fXYbOF2HJqs/FCILOm926G7R115E6YvoZmPmKc5VGM7Wt7W/K/oJN9nFTdoMF 80c5OKE4DhjOGmvJe+mtcnYynpVGgKYlzWAEhfYpDQ5hmaL7M/1eSy0MoINmOhh5kK52 ZSpxip1FWq/rs3G4fIA6jKdM8zdZTfrj4Qi4IQgym+HD59oUE2jlFIPTbC8tp1ZHyHU0 xXuw== MIME-Version: 1.0 X-Received: by 10.66.27.173 with SMTP id u13mr7809992pag.65.1383394288061; Sat, 02 Nov 2013 05:11:28 -0700 (PDT) Received: by 10.70.28.161 with HTTP; Sat, 2 Nov 2013 05:11:28 -0700 (PDT) In-Reply-To: References: Date: Sat, 2 Nov 2013 20:11:28 +0800 Message-ID: From: Shivleela Arlimatti To: sdn@irtf.org Content-Type: multipart/alternative; boundary=bcaec529986b1fd36004ea309594 Subject: Re: [Sdn] sdn Digest, Vol 19, Issue 1 X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 02 Nov 2013 12:11:29 -0000 --bcaec529986b1fd36004ea309594 Content-Type: text/plain; charset=ISO-8859-1 hai, I am new to this field... please guide me properly...what is this scribe duty....if any thing am ready to do... i am PhD student working on SDN.. Shivaleela Arlimatti Research scholar, InterNetworks Research Lab, CAS UUM Sintok, Malaysia. On Sat, Nov 2, 2013 at 3:00 AM, wrote: > If you have received this digest without all the individual message > attachments you will need to update your digest options in your list > subscription. To do so, go to > > https://www.irtf.org/mailman/listinfo/sdn > > Click the 'Unsubscribe or edit options' button, log in, and set "Get > MIME or Plain Text Digests?" to MIME. You can set this option > globally for all the list digests you receive at this point. > > > > Send sdn mailing list submissions to > sdn@irtf.org > > To subscribe or unsubscribe via the World Wide Web, visit > https://www.irtf.org/mailman/listinfo/sdn > or, via email, send a message with subject or body 'help' to > sdn-request@irtf.org > > You can reach the person managing the list at > sdn-owner@irtf.org > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of sdn digest..." > > > Today's Topics: > > 1. Scribe needed for the SDNRG meeting (David Meyer) > 2. Re: Scribe needed for the SDNRG meeting (Linda Dunbar) > 3. Re: Scribe needed for the SDNRG meeting (David Meyer) > 4. Re: Scribe needed for the SDNRG meeting (ramki Krishnan) > 5. Re: Scribe needed for the SDNRG meeting (David Meyer) > 6. still missing slides from a few presenters (David Meyer) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Thu, 31 Oct 2013 14:10:03 -0700 > From: David Meyer > To: SDN IRTF list > Subject: [Sdn] Scribe needed for the SDNRG meeting > Message-ID: > < > CAHiKxWjrunnMp4Ssw5X3eqrFFoXGiD6gM5s79dFg75rFYJdABA@mail.gmail.com> > Content-Type: text/plain; charset=ISO-8859-1 > > Anyone available for scribe duties? > > Thnx! > > --dmm > > > ------------------------------ > > Message: 2 > Date: Thu, 31 Oct 2013 21:26:24 +0000 > From: Linda Dunbar > To: David Meyer , SDN IRTF list > Subject: Re: [Sdn] Scribe needed for the SDNRG meeting > Message-ID: > < > 4A95BA014132FF49AE685FAB4B9F17F645BFA81E@dfweml509-mbx.china.huawei.com> > > Content-Type: text/plain; charset="us-ascii" > > I will do it. > > Linda > > > -----Original Message----- > > From: sdn-bounces@irtf.org [mailto:sdn-bounces@irtf.org] On Behalf Of > > David Meyer > > Sent: Thursday, October 31, 2013 4:10 PM > > To: SDN IRTF list > > Subject: [Sdn] Scribe needed for the SDNRG meeting > > > > Anyone available for scribe duties? > > > > Thnx! > > > > --dmm > > _______________________________________________ > > sdn mailing list > > sdn@irtf.org > > https://www.irtf.org/mailman/listinfo/sdn > > > ------------------------------ > > Message: 3 > Date: Thu, 31 Oct 2013 14:28:54 -0700 > From: David Meyer > To: Linda Dunbar > Cc: SDN IRTF list > Subject: Re: [Sdn] Scribe needed for the SDNRG meeting > Message-ID: > VxRT7FOoZ9sQbOjKCYu+CtznaDGis4Ra_cA@mail.gmail.com> > Content-Type: text/plain; charset=ISO-8859-1 > > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > > Thanks! --dmm > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.4.14 (GNU/Linux) > > iEYEARECAAYFAlJyy5YACgkQORgD1qCZ2KdRYgCdHDr2LhQyK3QP32MyPtPVWcWw > S98AniccXRNTAlCL9si9Z4fmibAhlENq > =I9dA > -----END PGP SIGNATURE----- > > On Thu, Oct 31, 2013 at 2:26 PM, Linda Dunbar > wrote: > > I will do it. > > > > Linda > > > >> -----Original Message----- > >> From: sdn-bounces@irtf.org [mailto:sdn-bounces@irtf.org] On Behalf Of > >> David Meyer > >> Sent: Thursday, October 31, 2013 4:10 PM > >> To: SDN IRTF list > >> Subject: [Sdn] Scribe needed for the SDNRG meeting > >> > >> Anyone available for scribe duties? > >> > >> Thnx! > >> > >> --dmm > >> _______________________________________________ > >> sdn mailing list > >> sdn@irtf.org > >> https://www.irtf.org/mailman/listinfo/sdn > > > ------------------------------ > > Message: 4 > Date: Thu, 31 Oct 2013 17:52:24 -0700 > From: ramki Krishnan > To: David Meyer , Linda Dunbar > > Cc: SDN IRTF list > Subject: Re: [Sdn] Scribe needed for the SDNRG meeting > Message-ID: > < > C7634EB63EFD984A978DFB46EA5174F2BFFFD52AE4@HQ1-EXCH01.corp.brocade.com> > > Content-Type: text/plain; charset="us-ascii" > > If there is one more scribe needed, please count me in Dave. > > Thanks, > Ramki > > -----Original Message----- > From: sdn-bounces@irtf.org [mailto:sdn-bounces@irtf.org] On Behalf Of > David Meyer > Sent: Thursday, October 31, 2013 2:29 PM > To: Linda Dunbar > Cc: SDN IRTF list > Subject: Re: [Sdn] Scribe needed for the SDNRG meeting > > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > > Thanks! --dmm > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.4.14 (GNU/Linux) > > iEYEARECAAYFAlJyy5YACgkQORgD1qCZ2KdRYgCdHDr2LhQyK3QP32MyPtPVWcWw > S98AniccXRNTAlCL9si9Z4fmibAhlENq > =I9dA > -----END PGP SIGNATURE----- > > On Thu, Oct 31, 2013 at 2:26 PM, Linda Dunbar > wrote: > > I will do it. > > > > Linda > > > >> -----Original Message----- > >> From: sdn-bounces@irtf.org [mailto:sdn-bounces@irtf.org] On Behalf Of > >> David Meyer > >> Sent: Thursday, October 31, 2013 4:10 PM > >> To: SDN IRTF list > >> Subject: [Sdn] Scribe needed for the SDNRG meeting > >> > >> Anyone available for scribe duties? > >> > >> Thnx! > >> > >> --dmm > >> _______________________________________________ > >> sdn mailing list > >> sdn@irtf.org > >> https://www.irtf.org/mailman/listinfo/sdn > _______________________________________________ > sdn mailing list > sdn@irtf.org > https://www.irtf.org/mailman/listinfo/sdn > > > ------------------------------ > > Message: 5 > Date: Thu, 31 Oct 2013 18:47:17 -0700 > From: David Meyer > To: ramki Krishnan > Cc: SDN IRTF list , Linda Dunbar > > Subject: Re: [Sdn] Scribe needed for the SDNRG meeting > Message-ID: > < > CAHiKxWhLbtsP2LqY3YYY08axyrEsQfmBpDqaoeN8OxMU6cxZNQ@mail.gmail.com> > Content-Type: text/plain; charset=ISO-8859-1 > > Thanks! We'll sort it out there :-) --dmm > > On Thu, Oct 31, 2013 at 5:52 PM, ramki Krishnan wrote: > > If there is one more scribe needed, please count me in Dave. > > > > Thanks, > > Ramki > > > > -----Original Message----- > > From: sdn-bounces@irtf.org [mailto:sdn-bounces@irtf.org] On Behalf Of > David Meyer > > Sent: Thursday, October 31, 2013 2:29 PM > > To: Linda Dunbar > > Cc: SDN IRTF list > > Subject: Re: [Sdn] Scribe needed for the SDNRG meeting > > > > -----BEGIN PGP SIGNED MESSAGE----- > > Hash: SHA1 > > > > > > Thanks! --dmm > > -----BEGIN PGP SIGNATURE----- > > Version: GnuPG v1.4.14 (GNU/Linux) > > > > iEYEARECAAYFAlJyy5YACgkQORgD1qCZ2KdRYgCdHDr2LhQyK3QP32MyPtPVWcWw > > S98AniccXRNTAlCL9si9Z4fmibAhlENq > > =I9dA > > -----END PGP SIGNATURE----- > > > > On Thu, Oct 31, 2013 at 2:26 PM, Linda Dunbar > wrote: > >> I will do it. > >> > >> Linda > >> > >>> -----Original Message----- > >>> From: sdn-bounces@irtf.org [mailto:sdn-bounces@irtf.org] On Behalf Of > >>> David Meyer > >>> Sent: Thursday, October 31, 2013 4:10 PM > >>> To: SDN IRTF list > >>> Subject: [Sdn] Scribe needed for the SDNRG meeting > >>> > >>> Anyone available for scribe duties? > >>> > >>> Thnx! > >>> > >>> --dmm > >>> _______________________________________________ > >>> sdn mailing list > >>> sdn@irtf.org > >>> https://www.irtf.org/mailman/listinfo/sdn > > _______________________________________________ > > sdn mailing list > > sdn@irtf.org > > https://www.irtf.org/mailman/listinfo/sdn > > > ------------------------------ > > Message: 6 > Date: Fri, 1 Nov 2013 09:24:57 -0700 > From: David Meyer > To: SDN IRTF list > Subject: [Sdn] still missing slides from a few presenters > Message-ID: > 1aU+g@mail.gmail.com> > Content-Type: text/plain; charset=ISO-8859-1 > > Please get your slides to me as soon as possible (if you haven't already). > > Thanks, > > --dmm > > > ------------------------------ > > _______________________________________________ > sdn mailing list > sdn@irtf.org > https://www.irtf.org/mailman/listinfo/sdn > > > End of sdn Digest, Vol 19, Issue 1 > ********************************** > --bcaec529986b1fd36004ea309594 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
hai,
=A0 I am new to this field... please guide me pro= perly...what is this scribe duty....if any thing am ready to do...
i am PhD student working on SDN..
<= br clear=3D"all">
Shivaleela Arlimatti
Research scholar,
= InterNetworks Research Lab, CAS
UUM Sintok, Malaysia.=A0


On Sat, Nov 2, 2013 at 3:00 AM, <sd= n-request@irtf.org> wrote:
If you have received this digest without all the individual message
attachments you will need to update your digest options in your list
subscription. =A0To do so, go to

htt= ps://www.irtf.org/mailman/listinfo/sdn

Click the 'Unsubscribe or edit options' button, log in, and set &qu= ot;Get
MIME or Plain Text Digests?" to MIME. =A0You can set this option
globally for all the list digests you receive at this point.



Send sdn mailing list submissions to
=A0 =A0 =A0 =A0 sdn@irtf.org

To subscribe or unsubscribe via the World Wide Web, visit
=A0 =A0 =A0 =A0 https://www.irtf.org/mailman/listinfo/sdn
or, via email, send a message with subject or body 'help' to
=A0 =A0 =A0 =A0 sdn-request@irtf.or= g

You can reach the person managing the list at
=A0 =A0 =A0 =A0 sdn-owner@irtf.org

When replying, please edit your Subject line so it is more specific
than "Re: Contents of sdn digest..."


Today's Topics:

=A0 =A01. Scribe needed for the SDNRG meeting (David Meyer)
=A0 =A02. Re: Scribe needed for the SDNRG meeting (Linda Dunbar)
=A0 =A03. Re: Scribe needed for the SDNRG meeting (David Meyer)
=A0 =A04. Re: Scribe needed for the SDNRG meeting (ramki Krishnan)
=A0 =A05. Re: Scribe needed for the SDNRG meeting (David Meyer)
=A0 =A06. still missing slides from a few presenters (David Meyer)


----------------------------------------------------------------------

Message: 1
Date: Thu, 31 Oct 2013 14:10:03 -0700
From: David Meyer <dmm@1-4-5.net>= ;
To: SDN IRTF list <sdn@irtf.org><= br> Subject: [Sdn] Scribe needed for the SDNRG meeting
Message-ID:
=A0 =A0 =A0 =A0 <CAHiKxWjrunnMp4Ssw5X3eqrFFoXGiD6gM5s79dFg75r= FYJdABA@mail.gmail.com>
Content-Type: text/plain; charset=3DISO-8859-1

Anyone available for scribe duties?

Thnx!

--dmm


------------------------------

Message: 2
Date: Thu, 31 Oct 2013 21:26:24 +0000
From: Linda Dunbar <linda.dun= bar@huawei.com>
To: David Meyer <dmm@1-4-5.net>,= SDN IRTF list <sdn@irtf.org>
Subject: Re: [Sdn] Scribe needed for the SDNRG meeting
Message-ID:
=A0 =A0 =A0 =A0 <4A95BA014132FF49AE685FAB4B9F17F645BFA81= E@dfweml509-mbx.china.huawei.com>

Content-Type: text/plain; charset=3D"us-ascii"

I will do it.

Linda

> -----Original Message-----
> From: sdn-bounces@irtf.org= [mailto:sdn-bounces@irtf.org] = On Behalf Of
> David Meyer
> Sent: Thursday, October 31, 2013 4:10 PM
> To: SDN IRTF list
> Subject: [Sdn] Scribe needed for the SDNRG meeting
>
> Anyone available for scribe duties?
>
> Thnx!
>
> --dmm
> _______________________________________________
> sdn mailing list
> sdn@irtf.org
> https://www.irtf.org/mailman/listinfo/sdn


------------------------------

Message: 3
Date: Thu, 31 Oct 2013 14:28:54 -0700
From: David Meyer <dmm@1-4-5.net>= ;
To: Linda Dunbar <linda.dunba= r@huawei.com>
Cc: SDN IRTF list <sdn@irtf.org><= br> Subject: Re: [Sdn] Scribe needed for the SDNRG meeting
Message-ID:
=A0 =A0 =A0 =A0 <CAHiKxWhyL7HTYv=3DVxRT7FOoZ9sQbOjKCYu+CtznaDGis4Ra_cA@mail= .gmail.com>
Content-Type: text/plain; charset=3DISO-8859-1

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1


Thanks! --dmm
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.14 (GNU/Linux)

iEYEARECAAYFAlJyy5YACgkQORgD1qCZ2KdRYgCdHDr2LhQyK3QP32MyPtPVWcWw
S98AniccXRNTAlCL9si9Z4fmibAhlENq
=3DI9dA
-----END PGP SIGNATURE-----

On Thu, Oct 31, 2013 at 2:26 PM, Linda Dunbar <linda.dunbar@huawei.com> wrote:
> I will do it.
>
> Linda
>
>> -----Original Message-----
>> From: sdn-bounces@irtf.org= [mailto:sdn-bounces@irtf.org] On Behalf Of
>> David Meyer
>> Sent: Thursday, October 31, 2013 4:10 PM
>> To: SDN IRTF list
>> Subject: [Sdn] Scribe needed for the SDNRG meeting
>>
>> Anyone available for scribe duties?
>>
>> Thnx!
>>
>> --dmm
>> _______________________________________________
>> sdn mailing list
>> sdn@irtf.org
>> https://www.irtf.org/mailman/listinfo/sdn


------------------------------

Message: 4
Date: Thu, 31 Oct 2013 17:52:24 -0700
From: ramki Krishnan <ramk@Brocade.com>
To: David Meyer <dmm@1-4-5.net>,= Linda Dunbar
=A0 =A0 =A0 =A0 <linda.dunbar= @huawei.com>
Cc: SDN IRTF list <sdn@irtf.org><= br> Subject: Re: [Sdn] Scribe needed for the SDNRG meeting
Message-ID:
=A0 =A0 =A0 =A0 <C7634EB63EFD984A978DFB46EA5174F2BFFFD52A= E4@HQ1-EXCH01.corp.brocade.com>

Content-Type: text/plain; charset=3D"us-ascii"

If there is one more scribe needed, please count me in Dave.

Thanks,
Ramki

-----Original Message-----
From: sdn-bounces@irtf.org [mai= lto:sdn-bounces@irtf.org] On Be= half Of David Meyer
Sent: Thursday, October 31, 2013 2:29 PM
To: Linda Dunbar
Cc: SDN IRTF list
Subject: Re: [Sdn] Scribe needed for the SDNRG meeting

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Hash: SHA1


Thanks! --dmm
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On Thu, Oct 31, 2013 at 2:26 PM, Linda Dunbar <linda.dunbar@huawei.com> wrote:
> I will do it.
>
> Linda
>
>> -----Original Message-----
>> From: sdn-bounces@irtf.org= [mailto:sdn-bounces@irtf.org] On Behalf Of
>> David Meyer
>> Sent: Thursday, October 31, 2013 4:10 PM
>> To: SDN IRTF list
>> Subject: [Sdn] Scribe needed for the SDNRG meeting
>>
>> Anyone available for scribe duties?
>>
>> Thnx!
>>
>> --dmm
>> _______________________________________________
>> sdn mailing list
>> sdn@irtf.org
>> https://www.irtf.org/mailman/listinfo/sdn
_______________________________________________
sdn mailing list
sdn@irtf.org
htt= ps://www.irtf.org/mailman/listinfo/sdn


------------------------------

Message: 5
Date: Thu, 31 Oct 2013 18:47:17 -0700
From: David Meyer <dmm@1-4-5.net>= ;
To: ramki Krishnan <ramk@brocade.com= >
Cc: SDN IRTF list <sdn@irtf.org>,= Linda Dunbar
=A0 =A0 =A0 =A0 <linda.dunbar= @huawei.com>
Subject: Re: [Sdn] Scribe needed for the SDNRG meeting
Message-ID:
=A0 =A0 =A0 =A0 <CAHiKxWhLbtsP2LqY3YYY08axyrEsQfmBpDqaoeN8OxM= U6cxZNQ@mail.gmail.com>
Content-Type: text/plain; charset=3DISO-8859-1

Thanks! We'll sort it out there :-) =A0--dmm

On Thu, Oct 31, 2013 at 5:52 PM, ramki Krishnan <ramk@brocade.com> wrote:
> If there is one more scribe needed, please count me in Dave.
>
> Thanks,
> Ramki
>
> -----Original Message-----
> From: sdn-bounces@irtf.org= [mailto:sdn-bounces@irtf.org] = On Behalf Of David Meyer
> Sent: Thursday, October 31, 2013 2:29 PM
> To: Linda Dunbar
> Cc: SDN IRTF list
> Subject: Re: [Sdn] Scribe needed for the SDNRG meeting
>
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
>
> Thanks! --dmm
> -----BEGIN PGP SIGNATURE-----
> Version: GnuPG v1.4.14 (GNU/Linux)
>
> iEYEARECAAYFAlJyy5YACgkQORgD1qCZ2KdRYgCdHDr2LhQyK3QP32MyPtPVWcWw
> S98AniccXRNTAlCL9si9Z4fmibAhlENq
> =3DI9dA
> -----END PGP SIGNATURE-----
>
> On Thu, Oct 31, 2013 at 2:26 PM, Linda Dunbar <linda.dunbar@huawei.com> wrote:
>> I will do it.
>>
>> Linda
>>
>>> -----Original Message-----
>>> From: sdn-bounces@irtf= .org [mailto:sdn-bounces@irtf.o= rg] On Behalf Of
>>> David Meyer
>>> Sent: Thursday, October 31, 2013 4:10 PM
>>> To: SDN IRTF list
>>> Subject: [Sdn] Scribe needed for the SDNRG meeting
>>>
>>> Anyone available for scribe duties?
>>>
>>> Thnx!
>>>
>>> --dmm
>>> _______________________________________________
>>> sdn mailing list
>>> sdn@irtf.org
>>> https://www.irtf.org/mailman/listinfo/sdn
> _______________________________________________
> sdn mailing list
> sdn@irtf.org
> https://www.irtf.org/mailman/listinfo/sdn


------------------------------

Message: 6
Date: Fri, 1 Nov 2013 09:24:57 -0700
From: David Meyer <dmm@1-4-5.net>= ;
To: SDN IRTF list <sdn@irtf.org><= br> Subject: [Sdn] still missing slides from a few presenters
Message-ID:
=A0 =A0 =A0 =A0 <CAHiKxWhFOYyx4uyW4GmcWKptWt4MmdSb4=3Dz+YkBmVnxS=3D1aU+g@mail.gmail.com>
Content-Type: text/plain; charset=3DISO-8859-1

Please get your slides to me as soon as possible (if you haven't alread= y).

Thanks,

--dmm


------------------------------

_______________________________________________
sdn mailing list
sdn@irtf.org
htt= ps://www.irtf.org/mailman/listinfo/sdn


End of sdn Digest, Vol 19, Issue 1
**********************************

--bcaec529986b1fd36004ea309594-- From Tina.Tsou.Zouting@huawei.com Tue Nov 5 11:04:21 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id DBA4411E8230 for ; Tue, 5 Nov 2013 11:04:21 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -6.599 X-Spam-Level: X-Spam-Status: No, score=-6.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id CxpDYS51cVOc for ; Tue, 5 Nov 2013 11:04:17 -0800 (PST) Received: from dfwrgout.huawei.com (dfwrgout.huawei.com [206.16.17.72]) by ietfa.amsl.com (Postfix) with ESMTP id 8DADD11E821C for ; Tue, 5 Nov 2013 11:04:17 -0800 (PST) Received: from 172.18.9.243 (EHLO dfweml201-edg.china.huawei.com) ([172.18.9.243]) by dfwrg02-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id AOG63036; Tue, 05 Nov 2013 13:04:12 -0600 (CST) Received: from DFWEML405-HUB.china.huawei.com (10.193.5.102) by dfweml201-edg.china.huawei.com (172.18.9.107) with Microsoft SMTP Server (TLS) id 14.3.158.1; Tue, 5 Nov 2013 11:04:08 -0800 Received: from SJCEML402-HUB.china.huawei.com (10.212.94.43) by dfweml405-hub.china.huawei.com (10.193.5.102) with Microsoft SMTP Server (TLS) id 14.3.158.1; Tue, 5 Nov 2013 11:03:56 -0800 Received: from SJCEML501-MBS.china.huawei.com ([169.254.2.123]) by sjceml402-hub.china.huawei.com ([10.212.94.43]) with mapi id 14.03.0158.001; Tue, 5 Nov 2013 11:03:52 -0800 From: Tina TSOU To: "sdn@irtf.org" Thread-Topic: Openv6 Bar BoF Thread-Index: Ac7aWcQkqALsv2JeTzeFGwWdoMv4Ag== Date: Tue, 5 Nov 2013 19:03:52 +0000 Message-ID: <94D80D15-E995-4935-A511-1190FCDCA76E@huawei.com> Accept-Language: en-US, zh-CN Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: Content-Type: text/plain; charset="utf-8" Content-ID: <95779B9A70F7AB4C8AC41766A3A761E0@huawei.com> Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-CFilter-Loop: Reflected Cc: "Diego R. Lopez" , Salim Hadi Jamal Subject: [Sdn] Openv6 Bar BoF X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 05 Nov 2013 19:04:22 -0000 RGVhciBhbGwsDQpPbiB0aGUgbWljIGRpc2N1c3Npb24gdGltZSBvZiBEaWVnbydzIHByZXNlbnRh dGlvbiBodHRwOi8vd3d3LmlldGYub3JnL3Byb2NlZWRpbmdzLzg4L3NsaWRlcy9zbGlkZXMtODgt c2RucmctNC5wZGYsIEphbWFsIHN1Z2dlc3RlZCBzZW5kaW5nIHRoZSBPcGVudjYgYmFyIEJvRiBp bmZvcm1hdGlvbiB0byB0aGUgbGlzdC4NCkhlcmUgeW91IGdvLg0KDQpUaW1lOiA3cG0tLTg6MzBw bSwgV2VkbmVzZGF5LCBOb3ZlbWJlciA2LCAyMDEzDQpQbGFjZTogUm9vbSBRdWVlbiBDaGFybG90 dGUgKGJlaGluZCB0aGUgVC1zaGlydCBkZXNrKSwgM3JkIGZsb29yDQoNClNldmVyYWwgLTAwIGRy YWZ0cw0K4oCiIGRyYWZ0LXN1bi1vcGVudjYtcHJvYmxlbS1zdGF0ZW1lbnQtMDAsIFByb2JsZW0g U3RhdGVtZW50IGZvciBPcGVudjYgU2NoZW1lDQrigKIgZHJhZnQtbGl1LW9wZW52Ni1hcmNoaXRl Y3R1cmUtMDAsIE9wZW52NiBBcmNoaXRlY3R1cmUgZm9yIElQdjYgRGVwbG95bWVudA0K4oCiIGRy YWZ0LXN1bi12Nm9wcy1vcGVudjYtYWRkcmVzcy1wb29sLW1hbmFnZW1lbnQtMDAsIEFkZHJlc3Mg TWFuYWdlbWVudCBmb3IgSVB2NiBUcmFuc2l0aW9uDQrigKIgZHJhZnQtemhvdS1uZXRtb2Qtb3Bl bnY2LXRyYW5zaXRpb24tY2ZnLTAwLCBBIFlBTkcgRGF0YSBNb2RlbCBmb3IgT3BlbiBJUHY2IFRy YW5zaXRpb24NCg0KVGhhbmsgeW91LA0KVGluYQ== From prvs=8021b76cd7=sshew@ciena.com Tue Nov 5 13:22:09 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 648DF21E80A6 for ; Tue, 5 Nov 2013 13:22:09 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -3.264 X-Spam-Level: X-Spam-Status: No, score=-3.264 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001, IP_NOT_FRIENDLY=0.334, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id eOn44D9V5QYr for ; Tue, 5 Nov 2013 13:22:03 -0800 (PST) Received: from mx0a-00103a01.pphosted.com (mx0a-00103a01.pphosted.com [67.231.144.234]) by ietfa.amsl.com (Postfix) with ESMTP id 6B76221E8099 for ; Tue, 5 Nov 2013 13:22:03 -0800 (PST) Received: from pps.filterd (m0000419.ppops.net [127.0.0.1]) by mx0a-00103a01.pphosted.com (8.14.5/8.14.5) with SMTP id rA5LDsYZ030470 for ; Tue, 5 Nov 2013 16:22:03 -0500 Received: from mdwexght02.ciena.com (LIN1-118-36-29.ciena.com [63.118.36.29]) by mx0a-00103a01.pphosted.com with ESMTP id 1fxfyxw6n5-1 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=NOT) for ; Tue, 05 Nov 2013 16:22:02 -0500 Received: from ONWVEXCHHT01.ciena.com (10.128.6.16) by MDWEXGHT02.ciena.com (10.4.140.213) with Microsoft SMTP Server (TLS) id 8.3.298.1; Tue, 5 Nov 2013 16:22:00 -0500 Received: from ONWVEXCHMB02.ciena.com ([::1]) by ONWVEXCHHT01.ciena.com ([::1]) with mapi; Tue, 5 Nov 2013 16:21:59 -0500 From: "Shew, Stephen" To: "sdn@irtf.org" Date: Tue, 5 Nov 2013 16:21:57 -0500 Thread-Topic: some comments on draft-lee-network-control-function-virtualization-01.txt Thread-Index: Ac7aaE4Hv8ppLNYUQXG7+EBHyZOVeg== Message-ID: <510C3D5C5DFBCB46AE189D936C1DD605A7297A998A@ONWVEXCHMB02.ciena.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US X-TM-AS-Product-Ver: SMEX-10.0.0.1412-7.000.1014-20270.002 X-TM-AS-Result: No--18.285800-0.000000-31 X-TM-AS-User-Approved-Sender: Yes X-TM-AS-User-Blocked-Sender: No Content-Type: multipart/alternative; boundary="_000_510C3D5C5DFBCB46AE189D936C1DD605A7297A998AONWVEXCHMB02c_" MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:5.10.8794, 1.0.431, 0.0.0000 definitions=2013-11-05_07:2013-11-05, 2013-11-05, 1970-01-01 signatures=0 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 suspectscore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=7.0.1-1305240000 definitions=main-1311050158 Subject: [Sdn] some comments on draft-lee-network-control-function-virtualization-01.txt X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 05 Nov 2013 21:22:09 -0000 --_000_510C3D5C5DFBCB46AE189D936C1DD605A7297A998AONWVEXCHMB02c_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable I have some comments on draft-lee-network-control-function-virtualization-0= 1.txt that could not be made in this morning's meeting due to time constrai= nts. 1. In reading the I-D, it was not clear what was being virtualized. I= n Network Functions Virtualization (the ETSI ISR), forwarding and network p= rotocols are virtualized onto servers. Virtualization in this sense is a s= ubstitution of a function running on dedicated hardware, to it running in s= ome generic environment (e.g., data center). In the I-D, it doesn't seem t= o me that this is what is meant. That is, the location of the Client Contr= ol, VNC, or PNC, is not specified to be on generic hardware. Instead, the = resources of the transport network are being presented in different views t= o clients. So what is being virtualized are transport network resources. = The software function to provide the virtualized view of the transport netw= ork resources may itself be in a virtual environment, but I don't think tha= t's the main point of the I-D. Some modification of the I-D title, or a de= scription of whether the VNC is being virtualized, would be helpful. 2. I suggest that the authors look at ITU-T Recommendations Y.1312 and= Y.1313, both on L1 virtual private networks. Clients can initiate connect= ions to other clients in the same VPN, and VPN topology can be exposed to c= lients. In talking with Young Lee this morning, he indicated that the I-D = did not refer to L1 VPNs, but the distinction isn't very clear to me. It w= ould be helpful to explain where the I-D differs from L1 VPNs as described = in Y.1312 and Y.1313 as they were written 10 years ago. Stephen Shew | Director, Standards sshew@ciena.com | 3500 Carling Ave. | Ottawa CANADA = K2H 8E9 Direct +1.613.670.3211 --_000_510C3D5C5DFBCB46AE189D936C1DD605A7297A998AONWVEXCHMB02c_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

I have some comments on= draft-lee-network-control-function-virtualization-01.txt that could not be= made in this morning’s meeting due to time constraints.

 

1.=       In reading the I-D= , it was not clear what was being virtualized.  In Network Functions V= irtualization (the ETSI ISR), forwarding and network protocols are virtuali= zed onto servers.  Virtualization in this sense is a substitution of a= function running on dedicated hardware, to it running in some generic envi= ronment (e.g., data center).  In the I-D, it doesn’t seem to me = that this is what is meant.  That is, the location of the Client Contr= ol, VNC, or PNC, is not specified to be on generic hardware.  Instead,= the resources of the transport network are being presented in different vi= ews to clients.  So what is being virtualized are transport network re= sources.  The software function to provide the virtualized view of the= transport network resources may itself be in a virtual environment, but I = don’t think that’s the main point of the I-D.  Some modifi= cation of the I-D title, or a description of whether the VNC is being virtu= alized, would be helpful.

<= span style=3D'font-family:"Times New Roman","serif";color:#31849B'>2.&nbs= p;     I suggest that the autho= rs look at ITU-T Recommendations Y.1312 and Y.1313, both on L1 virtual priv= ate networks.  Clients can initiate connections to other clients in th= e same VPN, and VPN topology can be exposed to clients.  In talking wi= th Young Lee this morning, he indicated that the I-D did not refer to L1 VP= Ns, but the distinction isn’t very clear to me.  It would be hel= pful to explain where the I-D differs from L1 VPNs as described in Y.1312 a= nd Y.1313 as they were written 10 years ago.

 

Stephen Shew<= /span> | Director, Standards<= span style=3D'font-size:7.5pt;font-family:"Arial","sans-serif";color:#31849= B'>
sshew@ciena.com | 35= 00 Carling Ave. | Ottawa CANADA K2H 8E9
Di= rect +1.613.670.3211

 <= /o:p>

= --_000_510C3D5C5DFBCB46AE189D936C1DD605A7297A998AONWVEXCHMB02c_-- From russw@riw.us Wed Nov 6 10:04:24 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9627521E816B for ; Wed, 6 Nov 2013 10:04:24 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.274 X-Spam-Level: X-Spam-Status: No, score=-0.274 tagged_above=-999 required=5 tests=[AWL=-0.929, BAYES_20=-0.74, MIME_QP_LONG_LINE=1.396] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id TnUBeB0rgEFr for ; Wed, 6 Nov 2013 10:04:18 -0800 (PST) Received: from server.riw.us (server.riw.us [162.144.32.236]) by ietfa.amsl.com (Postfix) with ESMTP id C9AB521E816F for ; Wed, 6 Nov 2013 10:04:18 -0800 (PST) Received: from dhcp-a335.meeting.ietf.org ([31.133.163.53]:57248) by server.riw.us with esmtpsa (TLSv1:AES128-SHA:128) (Exim 4.80.1) (envelope-from ) id 1Ve7Sd-0000TJ-Ll for sdn@irtf.org; Wed, 06 Nov 2013 18:04:12 +0000 From: Russ White Content-Type: text/plain; charset=us-ascii X-Mailer: iPad Mail (11B511) Message-Id: Date: Wed, 6 Nov 2013 09:58:56 -0800 To: "sdn@irtf.org" Content-Transfer-Encoding: quoted-printable Mime-Version: 1.0 (1.0) X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server.riw.us X-AntiAbuse: Original Domain - irtf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - riw.us X-Get-Message-Sender-Via: server.riw.us: authenticated_id: russ@riw.us X-Source: X-Source-Args: X-Source-Dir: Subject: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 Nov 2013 18:04:24 -0000 Y'all: In the SDN meeting, there was some discussion over the management and contro= l planes. I think defining these two is important in having consistent langu= age (hermeneutics being a hobby of mine, among many others). To wit, a possi= ble set of definitions for consideration and discussion. Not claiming these a= re perfect, but I do think we need to get past "this is faster than that," a= nd other permeable boundaries. - control plane: Those processes / configuration which directly impacts the i= nformation used to forward (or switch) traffic through a device. This would i= nclude distributed protocols, static configuration, etc. - management plane: Those processes or configuration that modify the operati= on of the control plane, or the general operation of the device on which the= control plane processes run. - data plane: The information and processes actually used to forward or proc= ess packets. So, for example: - OSPF is a control plane protocol - Configuring which interfaces OSPF runs on is a management function, since i= t impacts the operation of a control plane protocol - FORCES is a control plane protocol ( in the main) A single SDN system might interact with all three, of course (though I tend t= o believe these are different enough areas to warrant different solutions). I know there are probably hard cases that won't cleanly fit here, but we sho= uldn't let platypuses disturb our ability to differentiate between a duck an= d a beaver... Thoughts and discussion welcome, just would like to get this n= ailed down so we can actually have a common language to work from. :-) Russ <>< russw@riw.us Ericsson= From linda.dunbar@huawei.com Wed Nov 6 10:12:23 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 541E711E81CC for ; Wed, 6 Nov 2013 10:12:23 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -6.599 X-Spam-Level: X-Spam-Status: No, score=-6.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id xDHc+fIz4EMV for ; Wed, 6 Nov 2013 10:12:19 -0800 (PST) Received: from dfwrgout.huawei.com (dfwrgout.huawei.com [206.16.17.72]) by ietfa.amsl.com (Postfix) with ESMTP id 1932821F9339 for ; Wed, 6 Nov 2013 10:12:19 -0800 (PST) Received: from 172.18.9.243 (EHLO dfweml202-edg.china.huawei.com) ([172.18.9.243]) by dfwrg02-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id AOH35633; Wed, 06 Nov 2013 12:12:13 -0600 (CST) Received: from DFWEML406-HUB.china.huawei.com (10.193.5.131) by dfweml202-edg.china.huawei.com (172.18.9.108) with Microsoft SMTP Server (TLS) id 14.3.158.1; Wed, 6 Nov 2013 10:12:06 -0800 Received: from DFWEML509-MBX.china.huawei.com ([169.254.11.113]) by dfweml406-hub.china.huawei.com ([10.193.5.131]) with mapi id 14.03.0158.001; Wed, 6 Nov 2013 10:11:57 -0800 From: Linda Dunbar To: Russ White , "sdn@irtf.org" Thread-Topic: [Sdn] Thoughts on Defining control and Management Planes Thread-Index: AQHO2xqnEhbL93h6Jk+K7G6o0v+Mu5oYf9AA Date: Wed, 6 Nov 2013 18:11:57 +0000 Message-ID: <4A95BA014132FF49AE685FAB4B9F17F645BFD66E@dfweml509-mbx.china.huawei.com> References: In-Reply-To: Accept-Language: en-US, zh-CN Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.212.245.34] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-CFilter-Loop: Reflected Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 Nov 2013 18:12:23 -0000 It would be more useful to clarify why the NETCONF, that is commonly percei= ved as interface to management system, can't be used as interface to Contro= ller. I've heard that NETCONF can't do it fast enough. What is the minimum speed for interface to Controller? Linda > -----Original Message----- > From: sdn-bounces@irtf.org [mailto:sdn-bounces@irtf.org] On Behalf Of > Russ White > Sent: Wednesday, November 06, 2013 11:59 AM > To: sdn@irtf.org > Subject: [Sdn] Thoughts on Defining control and Management Planes >=20 > Y'all: >=20 > In the SDN meeting, there was some discussion over the management and > control planes. I think defining these two is important in having > consistent language (hermeneutics being a hobby of mine, among many > others). To wit, a possible set of definitions for consideration and > discussion. Not claiming these are perfect, but I do think we need to > get past "this is faster than that," and other permeable boundaries. >=20 > - control plane: Those processes / configuration which directly impacts > the information used to forward (or switch) traffic through a device. > This would include distributed protocols, static configuration, etc. >=20 > - management plane: Those processes or configuration that modify the > operation of the control plane, or the general operation of the device > on which the control plane processes run. >=20 > - data plane: The information and processes actually used to forward or > process packets. >=20 > So, for example: >=20 > - OSPF is a control plane protocol > - Configuring which interfaces OSPF runs on is a management function, > since it impacts the operation of a control plane protocol > - FORCES is a control plane protocol ( in the main) >=20 > A single SDN system might interact with all three, of course (though I > tend to believe these are different enough areas to warrant different > solutions). >=20 > I know there are probably hard cases that won't cleanly fit here, but > we shouldn't let platypuses disturb our ability to differentiate > between a duck and a beaver... Thoughts and discussion welcome, just > would like to get this nailed down so we can actually have a common > language to work from. >=20 > :-) >=20 > Russ >=20 >=20 >=20 > <>< > russw@riw.us > Ericsson > _______________________________________________ > sdn mailing list > sdn@irtf.org > https://www.irtf.org/mailman/listinfo/sdn From rraszuk@gmail.com Wed Nov 6 10:27:14 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D9BE411E8118 for ; Wed, 6 Nov 2013 10:27:14 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.605 X-Spam-Level: X-Spam-Status: No, score=-1.605 tagged_above=-999 required=5 tests=[AWL=0.373, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id O+BmIDbuhUox for ; Wed, 6 Nov 2013 10:27:14 -0800 (PST) Received: from mail-ie0-x22f.google.com (mail-ie0-x22f.google.com [IPv6:2607:f8b0:4001:c03::22f]) by ietfa.amsl.com (Postfix) with ESMTP id 3195611E8127 for ; Wed, 6 Nov 2013 10:27:14 -0800 (PST) Received: by mail-ie0-f175.google.com with SMTP id aq17so18433818iec.34 for ; Wed, 06 Nov 2013 10:27:13 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:date:message-id:subject :from:to:cc:content-type:content-transfer-encoding; bh=qhw20gtno8njn1J8On6HqmI9s6BmRngr+lKI3345U/0=; b=xJshzg+yTUAOqcNAvNYYeL4ec9FNI97bbq6IzXq+P4ZMR+5dyfjGwRGciwhsIZ9wgb JDqhQFq2G0ulqxFXsVZYx0bIIG/ULQ1v9mzRKF+X1UkkU0Zd2fZIfI9Psyi8pdqAmu2e Rixo0hDfEFQTPtxzzN4vx7OuNYb0b9EMNOhAe0ApZkOZJtzpwp0FYgaymXRJ4ou9FA/v DYibcVU9xjyqL6IHT8SVMj5n0fEwOYo1Is9iujyLGAuTZXkRqLl6VyzNDJ3Sh35+K8H3 jWfCThfyETp2zDwyNt64Qm3EUtgFCycZ4dDJ+np9COiNC+pR9SpmOJOetqx9ND6YxdgL yrTQ== MIME-Version: 1.0 X-Received: by 10.50.11.67 with SMTP id o3mr3388626igb.55.1383762433407; Wed, 06 Nov 2013 10:27:13 -0800 (PST) Sender: rraszuk@gmail.com Received: by 10.64.61.129 with HTTP; Wed, 6 Nov 2013 10:27:13 -0800 (PST) In-Reply-To: References: Date: Wed, 6 Nov 2013 19:27:13 +0100 X-Google-Sender-Auth: qZGqSdIrZd0tLq4wgYrSaXWAnMY Message-ID: From: Robert Raszuk To: Russ White Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Cc: "sdn@irtf.org" Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 Nov 2013 18:27:15 -0000 Hi Russ, To me network consists of three fundamental functional blocks: -A- topology discovery (centralized or distributed) -B- reachability computation/distribution/installation -C- monitoring/configuration Using your control plane vs management plane I see only the last one -C- can be categorized quite clearly as the mgmt plane. For -A- and -B- I have see real examples of complete mixture and any attempt to put those in any of your basket will clearly fail. Best, R. On Wed, Nov 6, 2013 at 6:58 PM, Russ White wrote: > Y'all: > > In the SDN meeting, there was some discussion over the management and con= trol planes. I think defining these two is important in having consistent l= anguage (hermeneutics being a hobby of mine, among many others). To wit, a = possible set of definitions for consideration and discussion. Not claiming = these are perfect, but I do think we need to get past "this is faster than = that," and other permeable boundaries. > > - control plane: Those processes / configuration which directly impacts t= he information used to forward (or switch) traffic through a device. This w= ould include distributed protocols, static configuration, etc. > > - management plane: Those processes or configuration that modify the oper= ation of the control plane, or the general operation of the device on which= the control plane processes run. > > - data plane: The information and processes actually used to forward or p= rocess packets. > > So, for example: > > - OSPF is a control plane protocol > - Configuring which interfaces OSPF runs on is a management function, sin= ce it impacts the operation of a control plane protocol > - FORCES is a control plane protocol ( in the main) > > A single SDN system might interact with all three, of course (though I te= nd to believe these are different enough areas to warrant different solutio= ns). > > I know there are probably hard cases that won't cleanly fit here, but we = shouldn't let platypuses disturb our ability to differentiate between a duc= k and a beaver... Thoughts and discussion welcome, just would like to get t= his nailed down so we can actually have a common language to work from. > > :-) > > Russ > > > > <>< > russw@riw.us > Ericsson > _______________________________________________ > sdn mailing list > sdn@irtf.org > https://www.irtf.org/mailman/listinfo/sdn From pedromj@um.es Wed Nov 6 10:31:46 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5DABE21F9AE7 for ; Wed, 6 Nov 2013 10:31:46 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -3.599 X-Spam-Level: X-Spam-Status: No, score=-3.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id eEefPzL1yQND for ; Wed, 6 Nov 2013 10:31:40 -0800 (PST) Received: from xenon13.um.es (xenon13.um.es [155.54.212.167]) by ietfa.amsl.com (Postfix) with ESMTP id DB94B21F9A05 for ; Wed, 6 Nov 2013 10:31:35 -0800 (PST) Received: from localhost (localhost [127.0.0.1]) by xenon13.um.es (Postfix) with ESMTP id 5D8095D945 for ; Wed, 6 Nov 2013 19:31:34 +0100 (CET) X-Virus-Scanned: by antispam in UMU at xenon13.um.es Received: from xenon13.um.es ([127.0.0.1]) by localhost (xenon13.um.es [127.0.0.1]) (amavisd-new, port 10024) with LMTP id Qci3ku4pTmk8 for ; Wed, 6 Nov 2013 19:31:34 +0100 (CET) Received: from localhost (1.Red-88-25-205.staticIP.rima-tde.net [88.25.205.1]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) (Authenticated sender: pedromj@um.es) by xenon13.um.es (Postfix) with ESMTPSA id DE1975D93E for ; Wed, 6 Nov 2013 19:31:32 +0100 (CET) Date: Wed, 6 Nov 2013 19:31:39 +0100 From: Pedro Martinez-Julia To: sdn@irtf.org Message-ID: <20131106183139.GK3809@um.es> References: <4A95BA014132FF49AE685FAB4B9F17F645BFD66E@dfweml509-mbx.china.huawei.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <4A95BA014132FF49AE685FAB4B9F17F645BFD66E@dfweml509-mbx.china.huawei.com> User-Agent: Mutt/1.5.22 (2013-10-16) Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 Nov 2013 18:31:46 -0000 On Wed, Nov 06, 2013 at 06:11:57PM +0000, Linda Dunbar wrote: > It would be more useful to clarify why the NETCONF, that is commonly perceived as interface to management system, can't be used as interface to Controller. I've heard that NETCONF can't do it fast enough. > What is the minimum speed for interface to Controller? > NETCONF is either a control and management protocol, depending on the function that it is used to do. > Linda Regards, Pedro -- Pedro Martinez-Julia Department of Communication and Information Engineering Faculty of Computer Science University of Murcia Email: pedromj@um.es --------------------------------------------------------- *** Entia non sunt multiplicanda praeter necessitatem *** From russw@riw.us Wed Nov 6 10:33:42 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9903F11E81DC for ; Wed, 6 Nov 2013 10:33:42 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.738 X-Spam-Level: X-Spam-Status: No, score=-0.738 tagged_above=-999 required=5 tests=[AWL=0.465, BAYES_00=-2.599, MIME_QP_LONG_LINE=1.396] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id nYm3CwrvIsMS for ; Wed, 6 Nov 2013 10:33:37 -0800 (PST) Received: from server.riw.us (server.riw.us [162.144.32.236]) by ietfa.amsl.com (Postfix) with ESMTP id AC2A221F9AE7 for ; Wed, 6 Nov 2013 10:33:37 -0800 (PST) Received: from dhcp-a335.meeting.ietf.org ([31.133.163.53]:57337) by server.riw.us with esmtpsa (TLSv1:AES128-SHA:128) (Exim 4.80.1) (envelope-from ) id 1Ve7v3-0000mU-JH; Wed, 06 Nov 2013 18:33:34 +0000 References: Mime-Version: 1.0 (1.0) In-Reply-To: Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Message-Id: <1B0BF471-3E6C-452E-96B8-FD6C88256B0C@riw.us> X-Mailer: iPad Mail (11B511) From: Russ White Date: Wed, 6 Nov 2013 10:33:33 -0800 To: Robert Raszuk X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server.riw.us X-AntiAbuse: Original Domain - irtf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - riw.us X-Get-Message-Sender-Via: server.riw.us: authenticated_id: russ@riw.us X-Source: X-Source-Args: X-Source-Dir: Cc: "sdn@irtf.org" Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 Nov 2013 18:33:45 -0000 The first part of the question is, then, should we take a network centric vi= ew of the question, or a device centric view. IMHO, as much as I think the n= etwork as a whole is crucial, the only way actually move forward with workab= le definitions is with a device centric view (from which we build broader ne= twork level models). You've essentially subsumed my entire model in one cate= gory within your model -- but I'm afraid that If we start with the ocean, st= reams and rivers become indistinguishable. :-) Russ <>< russw@riw.us Ericsson > On Nov 6, 2013, at 10:27 AM, Robert Raszuk wrote: >=20 > Hi Russ, >=20 > To me network consists of three fundamental functional blocks: >=20 > -A- topology discovery (centralized or distributed) > -B- reachability computation/distribution/installation > -C- monitoring/configuration >=20 > Using your control plane vs management plane I see only the last one > -C- can be categorized quite clearly as the mgmt plane. >=20 > For -A- and -B- I have see real examples of complete mixture and any > attempt to put those in any of your basket will clearly fail. >=20 > Best, > R. >=20 >=20 >=20 >> On Wed, Nov 6, 2013 at 6:58 PM, Russ White wrote: >> Y'all: >>=20 >> In the SDN meeting, there was some discussion over the management and con= trol planes. I think defining these two is important in having consistent la= nguage (hermeneutics being a hobby of mine, among many others). To wit, a po= ssible set of definitions for consideration and discussion. Not claiming the= se are perfect, but I do think we need to get past "this is faster than that= ," and other permeable boundaries. >>=20 >> - control plane: Those processes / configuration which directly impacts t= he information used to forward (or switch) traffic through a device. This wo= uld include distributed protocols, static configuration, etc. >>=20 >> - management plane: Those processes or configuration that modify the oper= ation of the control plane, or the general operation of the device on which t= he control plane processes run. >>=20 >> - data plane: The information and processes actually used to forward or p= rocess packets. >>=20 >> So, for example: >>=20 >> - OSPF is a control plane protocol >> - Configuring which interfaces OSPF runs on is a management function, sin= ce it impacts the operation of a control plane protocol >> - FORCES is a control plane protocol ( in the main) >>=20 >> A single SDN system might interact with all three, of course (though I te= nd to believe these are different enough areas to warrant different solution= s). >>=20 >> I know there are probably hard cases that won't cleanly fit here, but we s= houldn't let platypuses disturb our ability to differentiate between a duck a= nd a beaver... Thoughts and discussion welcome, just would like to get this n= ailed down so we can actually have a common language to work from. >>=20 >> :-) >>=20 >> Russ >>=20 >>=20 >>=20 >> <>< >> russw@riw.us >> Ericsson >> _______________________________________________ >> sdn mailing list >> sdn@irtf.org >> https://www.irtf.org/mailman/listinfo/sdn From russw@riw.us Wed Nov 6 10:36:00 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3855811E8164 for ; Wed, 6 Nov 2013 10:36:00 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.893 X-Spam-Level: X-Spam-Status: No, score=-0.893 tagged_above=-999 required=5 tests=[AWL=0.310, BAYES_00=-2.599, MIME_QP_LONG_LINE=1.396] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id nN0ZYRfXusZE for ; Wed, 6 Nov 2013 10:35:55 -0800 (PST) Received: from server.riw.us (server.riw.us [162.144.32.236]) by ietfa.amsl.com (Postfix) with ESMTP id 8DBFF11E8205 for ; Wed, 6 Nov 2013 10:35:54 -0800 (PST) Received: from dhcp-a335.meeting.ietf.org ([31.133.163.53]:57341) by server.riw.us with esmtpsa (TLSv1:AES128-SHA:128) (Exim 4.80.1) (envelope-from ) id 1Ve7xG-0000nX-Ru; Wed, 06 Nov 2013 18:35:51 +0000 References: <4A95BA014132FF49AE685FAB4B9F17F645BFD66E@dfweml509-mbx.china.huawei.com> Mime-Version: 1.0 (1.0) In-Reply-To: <4A95BA014132FF49AE685FAB4B9F17F645BFD66E@dfweml509-mbx.china.huawei.com> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Message-Id: <0BFF0FF1-2F2D-430C-B540-0CE5F9E204ED@riw.us> X-Mailer: iPad Mail (11B511) From: Russ White Date: Wed, 6 Nov 2013 10:35:49 -0800 To: Linda Dunbar X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server.riw.us X-AntiAbuse: Original Domain - irtf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - riw.us X-Get-Message-Sender-Via: server.riw.us: authenticated_id: russ@riw.us X-Source: X-Source-Args: X-Source-Dir: Cc: "sdn@irtf.org" Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 Nov 2013 18:36:00 -0000 I'd prefer to start with understanding what the areas are, then build requir= ements for those areas, then decide why protocol x will or won't work. This i= s actually why I don't think we can start with, "faster is control plane, sl= ower is management," won't work, because it subsumed requirements within the= definition itself. :-) Russ <>< russw@riw.us Ericsson > On Nov 6, 2013, at 10:11 AM, Linda Dunbar wrote:= >=20 > It would be more useful to clarify why the NETCONF, that is commonly perce= ived as interface to management system, can't be used as interface to Contro= ller. I've heard that NETCONF can't do it fast enough. > What is the minimum speed for interface to Controller? >=20 > Linda >> -----Original Message----- >> From: sdn-bounces@irtf.org [mailto:sdn-bounces@irtf.org] On Behalf Of >> Russ White >> Sent: Wednesday, November 06, 2013 11:59 AM >> To: sdn@irtf.org >> Subject: [Sdn] Thoughts on Defining control and Management Planes >>=20 >> Y'all: >>=20 >> In the SDN meeting, there was some discussion over the management and >> control planes. I think defining these two is important in having >> consistent language (hermeneutics being a hobby of mine, among many >> others). To wit, a possible set of definitions for consideration and >> discussion. Not claiming these are perfect, but I do think we need to >> get past "this is faster than that," and other permeable boundaries. >>=20 >> - control plane: Those processes / configuration which directly impacts >> the information used to forward (or switch) traffic through a device. >> This would include distributed protocols, static configuration, etc. >>=20 >> - management plane: Those processes or configuration that modify the >> operation of the control plane, or the general operation of the device >> on which the control plane processes run. >>=20 >> - data plane: The information and processes actually used to forward or >> process packets. >>=20 >> So, for example: >>=20 >> - OSPF is a control plane protocol >> - Configuring which interfaces OSPF runs on is a management function, >> since it impacts the operation of a control plane protocol >> - FORCES is a control plane protocol ( in the main) >>=20 >> A single SDN system might interact with all three, of course (though I >> tend to believe these are different enough areas to warrant different >> solutions). >>=20 >> I know there are probably hard cases that won't cleanly fit here, but >> we shouldn't let platypuses disturb our ability to differentiate >> between a duck and a beaver... Thoughts and discussion welcome, just >> would like to get this nailed down so we can actually have a common >> language to work from. >>=20 >> :-) >>=20 >> Russ >>=20 >>=20 >>=20 >> <>< >> russw@riw.us >> Ericsson >> _______________________________________________ >> sdn mailing list >> sdn@irtf.org >> https://www.irtf.org/mailman/listinfo/sdn From rraszuk@gmail.com Wed Nov 6 10:43:47 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 06B5A11E80D9 for ; Wed, 6 Nov 2013 10:43:47 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.631 X-Spam-Level: X-Spam-Status: No, score=-1.631 tagged_above=-999 required=5 tests=[AWL=0.347, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Ge6+15e+g5Nd for ; Wed, 6 Nov 2013 10:43:46 -0800 (PST) Received: from mail-ie0-x22f.google.com (mail-ie0-x22f.google.com [IPv6:2607:f8b0:4001:c03::22f]) by ietfa.amsl.com (Postfix) with ESMTP id 4E4E221E808D for ; Wed, 6 Nov 2013 10:43:46 -0800 (PST) Received: by mail-ie0-f175.google.com with SMTP id aq17so18471386iec.34 for ; Wed, 06 Nov 2013 10:43:45 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:date:message-id:subject :from:to:cc:content-type:content-transfer-encoding; bh=HT0AC6qVZq6kVop/OD7XMEoz29Ly0keJwcHkJWfdQ3w=; b=VRTWAXb9E0zxGinVzIzlxkw1xqszTY1H7FEYQdMh3Gc5/xcLe0ltLJYKqGZ0lQXm9Z KnV6RFrsQrKLBntoAZKmOPNiG2dZlkoX880mp4nV3CTMk3kZ4uhThLllytS3NuRDNcQf PDv9/opEuES8DcTkpG33SipxERg6uRBghFS9+h77NythqjPdmITdC8wO+UwQgDpcs5HA 3sT4s1ZQScKteBOsIwQs+hSWZA+vmhDHCTIQip3KcRZ/fqYIpq0nsjQVc/FlkCvnUmqK pjTl+gIOORLkG1e9BJ8HbIDSNeBYQ6lrUso2V2TS0vKihyudL3z+MdIbikM9xWpusvjn 9zZA== MIME-Version: 1.0 X-Received: by 10.42.232.206 with SMTP id jv14mr3047801icb.52.1383763425681; Wed, 06 Nov 2013 10:43:45 -0800 (PST) Sender: rraszuk@gmail.com Received: by 10.64.61.129 with HTTP; Wed, 6 Nov 2013 10:43:45 -0800 (PST) In-Reply-To: <1B0BF471-3E6C-452E-96B8-FD6C88256B0C@riw.us> References: <1B0BF471-3E6C-452E-96B8-FD6C88256B0C@riw.us> Date: Wed, 6 Nov 2013 19:43:45 +0100 X-Google-Sender-Auth: cAECQxSdlvbjDOM0HvgRhjRrHqY Message-ID: From: Robert Raszuk To: Russ White Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Cc: "sdn@irtf.org" Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 Nov 2013 18:43:47 -0000 Russ, IMHO we should take neither. Neither network nor device model works. SDN is about service models and then it can be mapped to network to realize it. of course networks consists of devices (physical or virtual). Such mapping can be done via some controller automation (example SDN compil= er). So finding what service is the target (can be multiple) is like first knowing where do you want to go on a map, before specifying your turn by turn directions. And of course there will be different set of directions depending what "network" types you are traversing ... city, forest, sea, air will all have very different results. Best, R. On Wed, Nov 6, 2013 at 7:33 PM, Russ White wrote: > > The first part of the question is, then, should we take a network centric= view of the question, or a device centric view. IMHO, as much as I think t= he network as a whole is crucial, the only way actually move forward with w= orkable definitions is with a device centric view (from which we build broa= der network level models). You've essentially subsumed my entire model in o= ne category within your model -- but I'm afraid that If we start with the o= cean, streams and rivers become indistinguishable. > > :-) > > Russ > > > > <>< > russw@riw.us > Ericsson > >> On Nov 6, 2013, at 10:27 AM, Robert Raszuk wrote: >> >> Hi Russ, >> >> To me network consists of three fundamental functional blocks: >> >> -A- topology discovery (centralized or distributed) >> -B- reachability computation/distribution/installation >> -C- monitoring/configuration >> >> Using your control plane vs management plane I see only the last one >> -C- can be categorized quite clearly as the mgmt plane. >> >> For -A- and -B- I have see real examples of complete mixture and any >> attempt to put those in any of your basket will clearly fail. >> >> Best, >> R. >> >> >> >>> On Wed, Nov 6, 2013 at 6:58 PM, Russ White wrote: >>> Y'all: >>> >>> In the SDN meeting, there was some discussion over the management and c= ontrol planes. I think defining these two is important in having consistent= language (hermeneutics being a hobby of mine, among many others). To wit, = a possible set of definitions for consideration and discussion. Not claimin= g these are perfect, but I do think we need to get past "this is faster tha= n that," and other permeable boundaries. >>> >>> - control plane: Those processes / configuration which directly impacts= the information used to forward (or switch) traffic through a device. This= would include distributed protocols, static configuration, etc. >>> >>> - management plane: Those processes or configuration that modify the op= eration of the control plane, or the general operation of the device on whi= ch the control plane processes run. >>> >>> - data plane: The information and processes actually used to forward or= process packets. >>> >>> So, for example: >>> >>> - OSPF is a control plane protocol >>> - Configuring which interfaces OSPF runs on is a management function, s= ince it impacts the operation of a control plane protocol >>> - FORCES is a control plane protocol ( in the main) >>> >>> A single SDN system might interact with all three, of course (though I = tend to believe these are different enough areas to warrant different solut= ions). >>> >>> I know there are probably hard cases that won't cleanly fit here, but w= e shouldn't let platypuses disturb our ability to differentiate between a d= uck and a beaver... Thoughts and discussion welcome, just would like to get= this nailed down so we can actually have a common language to work from. >>> >>> :-) >>> >>> Russ >>> >>> >>> >>> <>< >>> russw@riw.us >>> Ericsson >>> _______________________________________________ >>> sdn mailing list >>> sdn@irtf.org >>> https://www.irtf.org/mailman/listinfo/sdn From pedromj@um.es Wed Nov 6 10:44:24 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id BA61411E81C7 for ; Wed, 6 Nov 2013 10:44:24 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -5.099 X-Spam-Level: X-Spam-Status: No, score=-5.099 tagged_above=-999 required=5 tests=[AWL=1.500, BAYES_00=-2.599, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id JHvzmPVRKtqy for ; Wed, 6 Nov 2013 10:44:18 -0800 (PST) Received: from xenon11.um.es (xenon11.um.es [155.54.212.165]) by ietfa.amsl.com (Postfix) with ESMTP id B9E9821E815A for ; Wed, 6 Nov 2013 10:44:18 -0800 (PST) Received: from localhost (localhost [127.0.0.1]) by xenon11.um.es (Postfix) with ESMTP id D12B853B9B for ; Wed, 6 Nov 2013 19:44:11 +0100 (CET) X-Virus-Scanned: by antispam in UMU at xenon11.um.es Received: from xenon11.um.es ([127.0.0.1]) by localhost (xenon11.um.es [127.0.0.1]) (amavisd-new, port 10024) with LMTP id 6xrdjA6vRKyW for ; Wed, 6 Nov 2013 19:44:11 +0100 (CET) Received: from localhost (1.Red-88-25-205.staticIP.rima-tde.net [88.25.205.1]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) (Authenticated sender: pedromj@um.es) by xenon11.um.es (Postfix) with ESMTPSA id 48F95538F8 for ; Wed, 6 Nov 2013 19:44:11 +0100 (CET) Date: Wed, 6 Nov 2013 19:44:18 +0100 From: Pedro Martinez-Julia To: sdn@irtf.org Message-ID: <20131106184418.GL3809@um.es> References: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.22 (2013-10-16) Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 Nov 2013 18:44:24 -0000 On Wed, Nov 06, 2013 at 07:27:13PM +0100, Robert Raszuk wrote: > Hi Russ, > > To me network consists of three fundamental functional blocks: > > -A- topology discovery (centralized or distributed) In the context of current networks and SDN, I think that topology discovery should not be into the "core" functional blocks. I do not doubt that knowing the status of a device or link is important bu I advocate for separating "topology discovery", which should not be required for all scenarios, and "status control", which would be required by (almost) all scenarios. > -B- reachability computation/distribution/installation I agree on this and those could be certainly classified as control plane functions. > -C- monitoring/configuration > As you mentioned, this is a typical management plane function. > Using your control plane vs management plane I see only the last one > -C- can be categorized quite clearly as the mgmt plane. > > For -A- and -B- I have see real examples of complete mixture and any > attempt to put those in any of your basket will clearly fail. > > Best, > R. > Regards, Pedro -- Pedro Martinez-Julia Department of Communication and Information Engineering Faculty of Computer Science University of Murcia Email: pedromj@um.es --------------------------------------------------------- *** Entia non sunt multiplicanda praeter necessitatem *** From pedromj@um.es Wed Nov 6 10:51:42 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1F3FB21F9EAF for ; Wed, 6 Nov 2013 10:51:42 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -5.849 X-Spam-Level: X-Spam-Status: No, score=-5.849 tagged_above=-999 required=5 tests=[AWL=0.750, BAYES_00=-2.599, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id KnqcgYWRlmeh for ; Wed, 6 Nov 2013 10:51:32 -0800 (PST) Received: from xenon12.um.es (xenon12.um.es [155.54.212.166]) by ietfa.amsl.com (Postfix) with ESMTP id 8459D21E815C for ; Wed, 6 Nov 2013 10:51:25 -0800 (PST) Received: from localhost (localhost [127.0.0.1]) by xenon12.um.es (Postfix) with ESMTP id 641324C761 for ; Wed, 6 Nov 2013 19:51:22 +0100 (CET) X-Virus-Scanned: by antispam in UMU at xenon12.um.es Received: from xenon12.um.es ([127.0.0.1]) by localhost (xenon12.um.es [127.0.0.1]) (amavisd-new, port 10024) with LMTP id O3VloRLNSGau for ; Wed, 6 Nov 2013 19:51:22 +0100 (CET) Received: from localhost (1.Red-88-25-205.staticIP.rima-tde.net [88.25.205.1]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) (Authenticated sender: pedromj@um.es) by xenon12.um.es (Postfix) with ESMTPSA id E13D84C75F for ; Wed, 6 Nov 2013 19:51:21 +0100 (CET) Date: Wed, 6 Nov 2013 19:51:28 +0100 From: Pedro Martinez-Julia To: sdn@irtf.org Message-ID: <20131106185128.GM3809@um.es> References: <4A95BA014132FF49AE685FAB4B9F17F645BFD66E@dfweml509-mbx.china.huawei.com> <0BFF0FF1-2F2D-430C-B540-0CE5F9E204ED@riw.us> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <0BFF0FF1-2F2D-430C-B540-0CE5F9E204ED@riw.us> User-Agent: Mutt/1.5.22 (2013-10-16) Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 Nov 2013 18:51:42 -0000 On Wed, Nov 06, 2013 at 10:35:49AM -0800, Russ White wrote: > > I'd prefer to start with understanding what the areas are, then build requirements for those areas, then decide why protocol x will or won't work. This is actually why I don't think we can start with, "faster is control plane, slower is management," won't work, because it subsumed requirements within the definition itself. > > :-) > By the way, do we have something like a wiki page where we can edit together to reach an agreement on the definitions. It is very important to have the concepts very clear before discussing more deep questions. > Russ Regards, Pedro -- Pedro Martinez-Julia Department of Communication and Information Engineering Faculty of Computer Science University of Murcia Email: pedromj@um.es --------------------------------------------------------- *** Entia non sunt multiplicanda praeter necessitatem *** From leeyoung@huawei.com Wed Nov 6 10:52:25 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 27C5621E8161 for ; Wed, 6 Nov 2013 10:52:24 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -6.599 X-Spam-Level: X-Spam-Status: No, score=-6.599 tagged_above=-999 required=5 tests=[AWL=-0.001, BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id bMckcK1CrAYz for ; Wed, 6 Nov 2013 10:52:17 -0800 (PST) Received: from dfwrgout.huawei.com (dfwrgout.huawei.com [206.16.17.72]) by ietfa.amsl.com (Postfix) with ESMTP id BA72621E8175 for ; Wed, 6 Nov 2013 10:52:09 -0800 (PST) Received: from 172.18.9.243 (EHLO dfweml202-edg.china.huawei.com) ([172.18.9.243]) by dfwrg01-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id BWU33441; Wed, 06 Nov 2013 12:52:07 -0600 (CST) Received: from DFWEML408-HUB.china.huawei.com (10.193.5.134) by dfweml202-edg.china.huawei.com (172.18.9.108) with Microsoft SMTP Server (TLS) id 14.3.158.1; Wed, 6 Nov 2013 10:52:08 -0800 Received: from dfweml511-mbs.china.huawei.com ([169.254.15.141]) by dfweml408-hub.china.huawei.com ([10.193.5.134]) with mapi id 14.03.0158.001; Wed, 6 Nov 2013 10:52:02 -0800 From: Leeyoung To: "Shew, Stephen" , "sdn@irtf.org" Thread-Topic: [Sdn] some comments on draft-lee-network-control-function-virtualization-01.txt Thread-Index: Ac7aaE4Hv8ppLNYUQXG7+EBHyZOVegAt1Mtg Date: Wed, 6 Nov 2013 18:52:01 +0000 Message-ID: <7AEB3D6833318045B4AE71C2C87E8E17291E189D@dfweml511-mbs.china.huawei.com> References: <510C3D5C5DFBCB46AE189D936C1DD605A7297A998A@ONWVEXCHMB02.ciena.com> In-Reply-To: <510C3D5C5DFBCB46AE189D936C1DD605A7297A998A@ONWVEXCHMB02.ciena.com> Accept-Language: en-US, zh-CN Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.47.137.50] Content-Type: multipart/alternative; boundary="_000_7AEB3D6833318045B4AE71C2C87E8E17291E189Ddfweml511mbschi_" MIME-Version: 1.0 X-CFilter-Loop: Reflected Subject: Re: [Sdn] some comments on draft-lee-network-control-function-virtualization-01.txt X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 Nov 2013 18:52:25 -0000 --_000_7AEB3D6833318045B4AE71C2C87E8E17291E189Ddfweml511mbschi_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi Stephen, Thanks for this comment. We have discussed already these questions yesterda= y in the side meeting. But here's my response inline for a larger audience. Regards, Young From: sdn-bounces@irtf.org [mailto:sdn-bounces@irtf.org] On Behalf Of Shew,= Stephen Sent: Tuesday, November 05, 2013 3:22 PM To: sdn@irtf.org Subject: [Sdn] some comments on draft-lee-network-control-function-virtuali= zation-01.txt I have some comments on draft-lee-network-control-function-virtualization-0= 1.txt that could not be made in this morning's meeting due to time constrai= nts. 1. In reading the I-D, it was not clear what was being virtualized. I= n Network Functions Virtualization (the ETSI ISR), forwarding and network p= rotocols are virtualized onto servers. Virtualization in this sense is a s= ubstitution of a function running on dedicated hardware, to it running in s= ome generic environment (e.g., data center). In the I-D, it doesn't seem t= o me that this is what is meant. That is, the location of the Client Contr= ol, VNC, or PNC, is not specified to be on generic hardware. Instead, the = resources of the transport network are being presented in different views t= o clients. So what is being virtualized are transport network resources. = The software function to provide the virtualized view of the transport netw= ork resources may itself be in a virtual environment, but I don't think tha= t's the main point of the I-D. Some modification of the I-D title, or a de= scription of whether the VNC is being virtualized, would be helpful. YOUNG>> We are talking about virtual network control functions that operate= on abstracted/virtual networks. We are not attempting to extending VNF con= cept of NFV here. We are inserting virtual control function layer on top of= today's optical control plane layer to allow clients to define their virtu= al services in a programmable fashion. Basically transport network resource= s are shared across "multi-tenants" while giving clients control over their= resources allocated to them. 2. I suggest that the authors look at ITU-T Recommendations Y.1312 and= Y.1313, both on L1 virtual private networks. Clients can initiate connect= ions to other clients in the same VPN, and VPN topology can be exposed to c= lients. In talking with Young Lee this morning, he indicated that the I-D = did not refer to L1 VPNs, but the distinction isn't very clear to me. It w= ould be helpful to explain where the I-D differs from L1 VPNs as described = in Y.1312 and Y.1313 as they were written 10 years ago. YOUNG>> We will look into your suggested references. Stephen Shew | Director, Standards sshew@ciena.com | 3500 Carling Ave. | Ottawa CANADA = K2H 8E9 Direct +1.613.670.3211 --_000_7AEB3D6833318045B4AE71C2C87E8E17291E189Ddfweml511mbschi_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi Stephen,=

 

Thanks for this commen= t. We have discussed already these questions yesterday in the side meeting.= But here’s my response inline for a larger audience.

 

Regards,

Young

 

From: sdn-boun= ces@irtf.org [mailto:sdn-bounces@irtf.org] On Behalf Of Shew, Stephen
Sent: Tuesday, November 05, 2013 3:22 PM
To: sdn@irtf.org
Subject: [Sdn] some comments on draft-lee-network-control-function-v= irtualization-01.txt

 

I have some comments on draft-lee-netwo= rk-control-function-virtualization-01.txt that could not be made in this mo= rning’s meeting due to time constraints.

 

1= .   &= nbsp;  In reading the I-D, it was not = clear what was being virtualized.  In Network Functions Virtualization= (the ETSI ISR), forwarding and network protocols are virtualized onto servers.  Virtualization in this sense is a substitution of a fu= nction running on dedicated hardware, to it running in some generic environ= ment (e.g., data center).  In the I-D, it doesn’t seem to me tha= t this is what is meant.  That is, the location of the Client Control, VNC, or PNC, is not specified to be on generic hard= ware.  Instead, the resources of the transport network are being prese= nted in different views to clients.  So what is being virtualized are = transport network resources.  The software function to provide the virtualized view of the transport network resource= s may itself be in a virtual environment, but I don’t think that̵= 7;s the main point of the I-D.  Some modification of the I-D title, or= a description of whether the VNC is being virtualized, would be helpful.

 

YOUNG>> We are t= alking about virtual network control functions that operate on abstracted/v= irtual networks. We are not attempting to extending VNF concept of NFV here= . We are inserting virtual control function layer on top of today’s optical control plane layer to allow clients= to define their virtual services in a programmable fashion. Basically tran= sport network resources are shared across “multi-tenants” while= giving clients control over their resources allocated to them.

 

2= .   &= nbsp;  I suggest that the authors look= at ITU-T Recommendations Y.1312 and Y.1313, both on L1 virtual private net= works.  Clients can initiate connections to other clients in the same VPN, and VPN topology can be exposed to clients.  In talk= ing with Young Lee this morning, he indicated that the I-D did not refer to= L1 VPNs, but the distinction isn’t very clear to me.  It would = be helpful to explain where the I-D differs from L1 VPNs as described in Y.1312 and Y.1313 as they were written 10 years ag= o.

 

YOUNG>> We will = look into your suggested references.

 

Stephen Shew | Director, Standards
sshew@cien= a.com | 3500 Carling Ave. | Ottawa CANADA K2H 8E9
Direct +1.613.670.3211

 

--_000_7AEB3D6833318045B4AE71C2C87E8E17291E189Ddfweml511mbschi_-- From russw@riw.us Wed Nov 6 10:53:24 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 50E5021E818E for ; Wed, 6 Nov 2013 10:53:24 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.971 X-Spam-Level: X-Spam-Status: No, score=-0.971 tagged_above=-999 required=5 tests=[AWL=0.232, BAYES_00=-2.599, MIME_QP_LONG_LINE=1.396] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Jkq3WL99m6U4 for ; Wed, 6 Nov 2013 10:53:19 -0800 (PST) Received: from server.riw.us (server.riw.us [162.144.32.236]) by ietfa.amsl.com (Postfix) with ESMTP id 8B4C221E8180 for ; Wed, 6 Nov 2013 10:53:05 -0800 (PST) Received: from dhcp-a335.meeting.ietf.org ([31.133.163.53]:57423) by server.riw.us with esmtpsa (TLSv1:AES128-SHA:128) (Exim 4.80.1) (envelope-from ) id 1Ve8Dt-0000wn-Fx; Wed, 06 Nov 2013 18:53:01 +0000 References: <1B0BF471-3E6C-452E-96B8-FD6C88256B0C@riw.us> Mime-Version: 1.0 (1.0) In-Reply-To: Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Message-Id: X-Mailer: iPad Mail (11B511) From: Russ White Date: Wed, 6 Nov 2013 10:52:59 -0800 To: Robert Raszuk X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server.riw.us X-AntiAbuse: Original Domain - irtf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - riw.us X-Get-Message-Sender-Via: server.riw.us: authenticated_id: russ@riw.us X-Source: X-Source-Args: X-Source-Dir: Cc: "sdn@irtf.org" Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 Nov 2013 18:53:26 -0000 The service model cuts across the network and device divide, but I think des= cribing individual devices can fit within the service model, or rather that a= device centric model can be used to help build a service oriented model in t= he long run. But starting from a services model won't help us (I don't think= ) to build and understand the device level models needed to talk intelligent= ly about the problems that need to be addressed. :-) Russ <>< russw@riw.us Ericsson > On Nov 6, 2013, at 10:43 AM, Robert Raszuk wrote: >=20 > Russ, >=20 > IMHO we should take neither. Neither network nor device model works. >=20 > SDN is about service models and then it can be mapped to network to > realize it. of course networks consists of devices (physical or > virtual). >=20 > Such mapping can be done via some controller automation (example SDN compi= ler). >=20 > So finding what service is the target (can be multiple) is like first > knowing where do you want to go on a map, before specifying your turn > by turn directions. >=20 > And of course there will be different set of directions depending what > "network" types you are traversing ... city, forest, sea, air will all > have very different results. >=20 > Best, > R. >=20 >=20 >> On Wed, Nov 6, 2013 at 7:33 PM, Russ White wrote: >>=20 >> The first part of the question is, then, should we take a network centric= view of the question, or a device centric view. IMHO, as much as I think th= e network as a whole is crucial, the only way actually move forward with wor= kable definitions is with a device centric view (from which we build broader= network level models). You've essentially subsumed my entire model in one c= ategory within your model -- but I'm afraid that If we start with the ocean,= streams and rivers become indistinguishable. >>=20 >> :-) >>=20 >> Russ >>=20 >>=20 >>=20 >> <>< >> russw@riw.us >> Ericsson >>=20 >>> On Nov 6, 2013, at 10:27 AM, Robert Raszuk wrote: >>>=20 >>> Hi Russ, >>>=20 >>> To me network consists of three fundamental functional blocks: >>>=20 >>> -A- topology discovery (centralized or distributed) >>> -B- reachability computation/distribution/installation >>> -C- monitoring/configuration >>>=20 >>> Using your control plane vs management plane I see only the last one >>> -C- can be categorized quite clearly as the mgmt plane. >>>=20 >>> For -A- and -B- I have see real examples of complete mixture and any >>> attempt to put those in any of your basket will clearly fail. >>>=20 >>> Best, >>> R. >>>=20 >>>=20 >>>=20 >>>> On Wed, Nov 6, 2013 at 6:58 PM, Russ White wrote: >>>> Y'all: >>>>=20 >>>> In the SDN meeting, there was some discussion over the management and c= ontrol planes. I think defining these two is important in having consistent l= anguage (hermeneutics being a hobby of mine, among many others). To wit, a p= ossible set of definitions for consideration and discussion. Not claiming th= ese are perfect, but I do think we need to get past "this is faster than tha= t," and other permeable boundaries. >>>>=20 >>>> - control plane: Those processes / configuration which directly impacts= the information used to forward (or switch) traffic through a device. This w= ould include distributed protocols, static configuration, etc. >>>>=20 >>>> - management plane: Those processes or configuration that modify the op= eration of the control plane, or the general operation of the device on whic= h the control plane processes run. >>>>=20 >>>> - data plane: The information and processes actually used to forward or= process packets. >>>>=20 >>>> So, for example: >>>>=20 >>>> - OSPF is a control plane protocol >>>> - Configuring which interfaces OSPF runs on is a management function, s= ince it impacts the operation of a control plane protocol >>>> - FORCES is a control plane protocol ( in the main) >>>>=20 >>>> A single SDN system might interact with all three, of course (though I t= end to believe these are different enough areas to warrant different solutio= ns). >>>>=20 >>>> I know there are probably hard cases that won't cleanly fit here, but w= e shouldn't let platypuses disturb our ability to differentiate between a du= ck and a beaver... Thoughts and discussion welcome, just would like to get t= his nailed down so we can actually have a common language to work from. >>>>=20 >>>> :-) >>>>=20 >>>> Russ >>>>=20 >>>>=20 >>>>=20 >>>> <>< >>>> russw@riw.us >>>> Ericsson >>>> _______________________________________________ >>>> sdn mailing list >>>> sdn@irtf.org >>>> https://www.irtf.org/mailman/listinfo/sdn From rraszuk@gmail.com Wed Nov 6 11:02:48 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6FECF21E8142 for ; Wed, 6 Nov 2013 11:02:48 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.642 X-Spam-Level: X-Spam-Status: No, score=-1.642 tagged_above=-999 required=5 tests=[AWL=0.336, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 0AM1gbZqNwkr for ; Wed, 6 Nov 2013 11:02:48 -0800 (PST) Received: from mail-ie0-x231.google.com (mail-ie0-x231.google.com [IPv6:2607:f8b0:4001:c03::231]) by ietfa.amsl.com (Postfix) with ESMTP id 0459411E817A for ; Wed, 6 Nov 2013 11:02:47 -0800 (PST) Received: by mail-ie0-f177.google.com with SMTP id e14so18202695iej.36 for ; Wed, 06 Nov 2013 11:02:47 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:date:message-id:subject :from:to:cc:content-type; bh=gKn2HninKVjrhJg6Poq2T4ULVJpOKZ8l1OEd0OIpm9s=; b=jSV/oyyZpNLjL3Xfk8HowEfJP/Sen54b7q9q5dJ/2ZIy2rhb23D2A+qaryoEQVE+OL rqLaqG1BKPJCLPnaCkhec0fY6H/ZOfrbodd6bLUtMNTspoquirYBZsij58boqsr/3wlu CykehMOYU7PhzcLC/ydDVRKFAh7+KRR3+f6cyx7kiuK8vZHUEg0ixMczbTrfODkmBYAS M4FdrfAXwT+2OC3c7ewwxG5802Vg74OrnJmjJUeQSCHHoqHpa9at+QrAjXU25qHeJdHE YDURm9fXoAYRrtXj7kCSQBRpGg2P+q78hLdpBbl6hIS/iu2Pkiyomc1iDTD40JfBec/g d9Tg== MIME-Version: 1.0 X-Received: by 10.43.78.20 with SMTP id zk20mr1803642icb.61.1383764567412; Wed, 06 Nov 2013 11:02:47 -0800 (PST) Sender: rraszuk@gmail.com Received: by 10.64.61.129 with HTTP; Wed, 6 Nov 2013 11:02:47 -0800 (PST) In-Reply-To: <20131106184418.GL3809@um.es> References: <20131106184418.GL3809@um.es> Date: Wed, 6 Nov 2013 20:02:47 +0100 X-Google-Sender-Auth: -Gihh6RzC6RabLSrKQEmd6FuLZo Message-ID: From: Robert Raszuk To: Pedro Martinez-Julia Content-Type: text/plain; charset=ISO-8859-1 Cc: SDN IRTF list Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 Nov 2013 19:02:48 -0000 >> -A- topology discovery (centralized or distributed) > > In the context of current networks and SDN, I think that topology > discovery should not be into the "core" functional blocks. I do not > doubt that knowing the status of a device or link is important bu I > advocate for separating "topology discovery", which should not be > required for all scenarios, and "status control", which would be > required by (almost) all scenarios. I think topology discovery is extremely important for any service delivery (including overlays). In fact I think that's a mistake of number of SDN folks including ONF where they do not focus on topology. That alone allows one to say that IGPs are legacy yet they do not provide any where equal connectivity restoration mechanisms. Thx, r, From pedromj@um.es Wed Nov 6 11:23:29 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7AB5E11E817A for ; Wed, 6 Nov 2013 11:23:29 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -6.099 X-Spam-Level: X-Spam-Status: No, score=-6.099 tagged_above=-999 required=5 tests=[AWL=0.500, BAYES_00=-2.599, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 0REEYS1Ih+Q8 for ; Wed, 6 Nov 2013 11:23:23 -0800 (PST) Received: from xenon11.um.es (xenon11.um.es [155.54.212.165]) by ietfa.amsl.com (Postfix) with ESMTP id 8A96921F9CAC for ; Wed, 6 Nov 2013 11:23:22 -0800 (PST) Received: from localhost (localhost [127.0.0.1]) by xenon11.um.es (Postfix) with ESMTP id 7206153BD3 for ; Wed, 6 Nov 2013 20:23:21 +0100 (CET) X-Virus-Scanned: by antispam in UMU at xenon11.um.es Received: from xenon11.um.es ([127.0.0.1]) by localhost (xenon11.um.es [127.0.0.1]) (amavisd-new, port 10024) with LMTP id lKpqTwwlxbR2 for ; Wed, 6 Nov 2013 20:23:21 +0100 (CET) Received: from localhost (1.Red-88-25-205.staticIP.rima-tde.net [88.25.205.1]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) (Authenticated sender: pedromj@um.es) by xenon11.um.es (Postfix) with ESMTPSA id DF35D53BDB for ; Wed, 6 Nov 2013 20:23:19 +0100 (CET) Date: Wed, 6 Nov 2013 20:23:26 +0100 From: Pedro Martinez-Julia To: sdn@irtf.org Message-ID: <20131106192326.GO3809@um.es> References: <20131106184418.GL3809@um.es> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.22 (2013-10-16) Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 Nov 2013 19:23:29 -0000 On Wed, Nov 06, 2013 at 08:02:47PM +0100, Robert Raszuk wrote: > > I think topology discovery is extremely important for any service > delivery (including overlays). > It may be if the interested party do not know the topology but the SDN controllers *must* know the topology of their network, so the only missing function would be to control its state. I am not arguing against having a topology discovery function as part of the network but I think it should be separated from the state of elements and links. > In fact I think that's a mistake of number of SDN folks including ONF > where they do not focus on topology. That alone allows one to say that > IGPs are legacy yet they do not provide any where equal connectivity > restoration mechanisms. > As the controllers are in responsible of topology and link states, IGPs following the current model are no longer needed. However some functions may require an IGP-like protocol for controller-to-controller exchange of status (and topology) information. > Thx, > r, Regards, Pedro -- Pedro Martinez-Julia Department of Communication and Information Engineering Faculty of Computer Science University of Murcia Email: pedromj@um.es --------------------------------------------------------- *** Entia non sunt multiplicanda praeter necessitatem *** From rraszuk@gmail.com Wed Nov 6 11:31:31 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id BFF8421E808D for ; Wed, 6 Nov 2013 11:31:25 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.652 X-Spam-Level: X-Spam-Status: No, score=-1.652 tagged_above=-999 required=5 tests=[AWL=0.325, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Pz87bObkxCNb for ; Wed, 6 Nov 2013 11:31:24 -0800 (PST) Received: from mail-ie0-x22e.google.com (mail-ie0-x22e.google.com [IPv6:2607:f8b0:4001:c03::22e]) by ietfa.amsl.com (Postfix) with ESMTP id 036BC21F9EE1 for ; Wed, 6 Nov 2013 11:31:23 -0800 (PST) Received: by mail-ie0-f174.google.com with SMTP id qd12so17861318ieb.19 for ; Wed, 06 Nov 2013 11:31:23 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:date:message-id:subject :from:to:cc:content-type; bh=XsWxO4V7O1RFQVYrF2lbTs4R2FrgmLEAwl8wOnMF6FM=; b=yPiPhERezCBDiKGnfSC2NP5pZ4ioFXghuiLdlAbVR76fTYsLIcngZf5ybya2KZLFWB lSA7k2Al8kIpKfa1QBeg/7I5+xcd6bedB/ULybvx87PPbrMCTQ2vOQK/vhaZmUkRi0my rD1RYOa4dihvthXPhu25Nnrrb0T0v2ARhZrEd8E9RrC6d3bltWO3TZNqcJPtwtuNCTMI WfUiH4o6n/E+97uDLdcqSpM5e/czIw4Ad96gHGH4scR7KuoxePvi4slUeMV1jk+btGHW eQQ4dKIMqMRwKbGp1lKdmTL9vm0sDX0k2wOjBF/80OXrCCt7T9IKalkZvykYYScedM3s /reg== MIME-Version: 1.0 X-Received: by 10.42.54.132 with SMTP id r4mr3095412icg.19.1383766283142; Wed, 06 Nov 2013 11:31:23 -0800 (PST) Sender: rraszuk@gmail.com Received: by 10.64.61.129 with HTTP; Wed, 6 Nov 2013 11:31:23 -0800 (PST) Received: by 10.64.61.129 with HTTP; Wed, 6 Nov 2013 11:31:23 -0800 (PST) In-Reply-To: <20131106192326.GO3809@um.es> References: <20131106184418.GL3809@um.es> <20131106192326.GO3809@um.es> Date: Wed, 6 Nov 2013 20:31:23 +0100 X-Google-Sender-Auth: cw_i8dnX8HK9BUSdBr2K6DoSHUg Message-ID: From: Robert Raszuk To: Pedro Martinez-Julia Content-Type: multipart/alternative; boundary=90e6ba539e94c2db4a04ea873177 Cc: SDN IRTF list Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 Nov 2013 19:31:31 -0000 --90e6ba539e94c2db4a04ea873177 Content-Type: text/plain; charset=ISO-8859-1 Ahhh ok I was mainly talking about state of links and nodes. Physical topology discovery/verification is also needed though. Regarding your comment that igp-s are no longer needed we clearly have different opinions and can agree to disagree here ;). Best, R On Nov 6, 2013 11:23 AM, "Pedro Martinez-Julia" wrote: > On Wed, Nov 06, 2013 at 08:02:47PM +0100, Robert Raszuk wrote: > > > > I think topology discovery is extremely important for any service > > delivery (including overlays). > > > > It may be if the interested party do not know the topology but the SDN > controllers *must* know the topology of their network, so the only > missing function would be to control its state. I am not arguing against > having a topology discovery function as part of the network but I think > it should be separated from the state of elements and links. > > > In fact I think that's a mistake of number of SDN folks including ONF > > where they do not focus on topology. That alone allows one to say that > > IGPs are legacy yet they do not provide any where equal connectivity > > restoration mechanisms. > > > > As the controllers are in responsible of topology and link states, IGPs > following the current model are no longer needed. However some functions > may require an IGP-like protocol for controller-to-controller exchange > of status (and topology) information. > > > Thx, > > r, > > Regards, > Pedro > > -- > Pedro Martinez-Julia > Department of Communication and Information Engineering > Faculty of Computer Science > University of Murcia > Email: pedromj@um.es > --------------------------------------------------------- > *** Entia non sunt multiplicanda praeter necessitatem *** > _______________________________________________ > sdn mailing list > sdn@irtf.org > https://www.irtf.org/mailman/listinfo/sdn > --90e6ba539e94c2db4a04ea873177 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable

Ahhh ok I was mainly talking about state of links and nodes.=

Physical topology discovery/verification is also needed thou= gh.

Regarding your comment that igp-s are no longer needed we cl= early have different opinions and can agree to disagree here ;).

Best,
R

On Nov 6, 2013 11:23 AM, "Pedro Martinez-Ju= lia" <pedromj@um.es> wrote:=
On Wed, Nov 06, 2013 at 08:02:47PM +0100, Robert Raszuk wrote:
>
> I think topology discovery is extremely important for any service
> delivery (including overlays).
>

It may be if the interested party do not know the topology but the SDN
controllers *must* know the topology of their network, so the only
missing function would be to control its state. I am not arguing against having a topology discovery function as part of the network but I think
it should be separated from the state of elements and links.

> In fact I think that's a mistake of number of SDN folks including = ONF
> where they do not focus on topology. That alone allows one to say that=
> IGPs are legacy yet they do not provide any where equal connectivity > restoration mechanisms.
>

As the controllers are in responsible of topology and link states, IGPs
following the current model are no longer needed. However some functions may require an IGP-like protocol for controller-to-controller exchange
of status (and topology) information.

> Thx,
> r,

Regards,
Pedro

--
Pedro Martinez-Julia
Department of Communication and Information Engineering
Faculty of Computer Science
University of Murcia
Email: pedromj@um.es
---------------------------------------------------------
*** Entia non sunt multiplicanda praeter necessitatem ***
_______________________________________________
sdn mailing list
sdn@irtf.org
htt= ps://www.irtf.org/mailman/listinfo/sdn
--90e6ba539e94c2db4a04ea873177-- From russw@riw.us Wed Nov 6 13:32:42 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3BE5821E819F for ; Wed, 6 Nov 2013 13:32:42 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.463 X-Spam-Level: X-Spam-Status: No, score=-0.463 tagged_above=-999 required=5 tests=[AWL=0.277, BAYES_20=-0.74] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 05OzEorHGR1g for ; Wed, 6 Nov 2013 13:32:34 -0800 (PST) Received: from server.riw.us (server.riw.us [162.144.32.236]) by ietfa.amsl.com (Postfix) with ESMTP id C139321E8185 for ; Wed, 6 Nov 2013 13:32:34 -0800 (PST) Received: from [64.114.24.114] (port=51729 helo=RussPC) by server.riw.us with esmtpsa (TLSv1:AES128-SHA:128) (Exim 4.80.1) (envelope-from ) id 1VeAiD-00028D-Vq; Wed, 06 Nov 2013 21:32:30 +0000 From: "Russ White" To: "'Robert Raszuk'" , "'Pedro Martinez-Julia'" References: <20131106184418.GL3809@um.es> <20131106192326.GO3809@um.es> In-Reply-To: Date: Wed, 6 Nov 2013 16:32:35 -0500 Message-ID: <01d701cedb37$b68421c0$238c6540$@riw.us> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Outlook 15.0 Thread-Index: AQENI0eiA8rOH7Iq3TRo8LAe8dZyDQN1fs+AAdnfhV4B1XWY0AMFmjmlAiqfHQSbOYA7AA== Content-Language: en-us X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server.riw.us X-AntiAbuse: Original Domain - irtf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - riw.us X-Get-Message-Sender-Via: server.riw.us: authenticated_id: russw@riw.us X-Source: X-Source-Args: X-Source-Dir: Cc: 'SDN IRTF list' Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 Nov 2013 21:32:42 -0000 > Regarding your comment that igp-s are no longer needed we clearly have > different opinions and can agree to disagree here ;). A world without IGPs would be like a world without... Well... Sliced bread? I don't know. Scary thought. :-) Russ From russw@riw.us Wed Nov 6 13:35:25 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7651121E8155 for ; Wed, 6 Nov 2013 13:35:25 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.531 X-Spam-Level: X-Spam-Status: No, score=-1.531 tagged_above=-999 required=5 tests=[AWL=1.068, BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Uiw2l6ZDdiZt for ; Wed, 6 Nov 2013 13:35:19 -0800 (PST) Received: from server.riw.us (server.riw.us [162.144.32.236]) by ietfa.amsl.com (Postfix) with ESMTP id E528C21E80B0 for ; Wed, 6 Nov 2013 13:35:18 -0800 (PST) Received: from [64.114.24.114] (port=51738 helo=RussPC) by server.riw.us with esmtpsa (TLSv1:AES128-SHA:128) (Exim 4.80.1) (envelope-from ) id 1VeAkr-00029m-Ba; Wed, 06 Nov 2013 21:35:14 +0000 From: "Russ White" To: "'Gurkan, Deniz'" , References: In-Reply-To: Date: Wed, 6 Nov 2013 16:35:19 -0500 Message-ID: <01d801cedb38$17e3ce20$47ab6a60$@riw.us> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Outlook 15.0 Thread-Index: AQENI0eiA8rOH7Iq3TRo8LAe8dZyDQG87cWIm45BiXA= Content-Language: en-us X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server.riw.us X-AntiAbuse: Original Domain - irtf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - riw.us X-Get-Message-Sender-Via: server.riw.us: authenticated_id: russw@riw.us X-Source: X-Source-Args: X-Source-Dir: Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 Nov 2013 21:35:25 -0000 > I am trying to understand whether your definition of management plane also > includes a view of resources on devices. After all, if one does not know what > devices are in one's network, how do we manage them? This might be in > "discovery" operation for topology but manageability is not limited to > topology only. I am talking about configurable parameters on devices that > only a management plane would deal with such as queues, TCAM spaces (or > flow spaces), etc. I would consider resources, such as memory, physical ports, cpu, power, environmentals, etc., all within the management plane, myself. Of course I'm open to having my mind changed (the point of discussion!) through some other model... It might also be useful to somehow differentiate between management of the protocols in the control plane, and management of the device on which the protocols run in some way (?). :-) Russ From pedromj@um.es Wed Nov 6 13:45:04 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E7B1C11E815F for ; Wed, 6 Nov 2013 13:45:03 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.724 X-Spam-Level: X-Spam-Status: No, score=-4.724 tagged_above=-999 required=5 tests=[AWL=-1.125, BAYES_00=-2.599, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id AfNl8zAf5c89 for ; Wed, 6 Nov 2013 13:44:58 -0800 (PST) Received: from xenon13.um.es (xenon13.um.es [155.54.212.167]) by ietfa.amsl.com (Postfix) with ESMTP id 0404721F9B7E for ; Wed, 6 Nov 2013 13:42:30 -0800 (PST) Received: from localhost (localhost [127.0.0.1]) by xenon13.um.es (Postfix) with ESMTP id F1FD95D93A for ; Wed, 6 Nov 2013 22:42:27 +0100 (CET) X-Virus-Scanned: by antispam in UMU at xenon13.um.es Received: from xenon13.um.es ([127.0.0.1]) by localhost (xenon13.um.es [127.0.0.1]) (amavisd-new, port 10024) with LMTP id hqjgJM8Sky5T for ; Wed, 6 Nov 2013 22:42:27 +0100 (CET) Received: from localhost (1.Red-88-25-205.staticIP.rima-tde.net [88.25.205.1]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) (Authenticated sender: pedromj@um.es) by xenon13.um.es (Postfix) with ESMTPSA id 6B5205D6F3 for ; Wed, 6 Nov 2013 22:42:27 +0100 (CET) Date: Wed, 6 Nov 2013 22:42:34 +0100 From: Pedro Martinez-Julia To: sdn@irtf.org Message-ID: <20131106214234.GP3809@um.es> References: <20131106184418.GL3809@um.es> <20131106192326.GO3809@um.es> <01d701cedb37$b68421c0$238c6540$@riw.us> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <01d701cedb37$b68421c0$238c6540$@riw.us> User-Agent: Mutt/1.5.22 (2013-10-16) Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 Nov 2013 21:45:04 -0000 On Wed, Nov 06, 2013 at 04:32:35PM -0500, Russ White wrote: > > > Regarding your comment that igp-s are no longer needed we clearly have > > different opinions and can agree to disagree here ;). > > A world without IGPs would be like a world without... Well... Sliced bread? > I don't know. Scary thought. > I prefer to see a world where each "entity" is dedicated and specialized to do its job, and dealing with IGP is not a good job for a forwarding entity. The more functionality you include into the forwarding entity, the less efficient it is. > :-) > > Russ > Regards, Pedro -- Pedro Martinez-Julia Department of Communication and Information Engineering Faculty of Computer Science University of Murcia Email: pedromj@um.es --------------------------------------------------------- *** Entia non sunt multiplicanda praeter necessitatem *** From rraszuk@gmail.com Wed Nov 6 14:52:51 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7F16521E809E for ; Wed, 6 Nov 2013 14:52:50 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.204 X-Spam-Level: X-Spam-Status: No, score=-1.204 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, MIME_QP_LONG_LINE=1.396, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id VdBpZZ6y9zdX for ; Wed, 6 Nov 2013 14:52:49 -0800 (PST) Received: from mail-pb0-x22a.google.com (mail-pb0-x22a.google.com [IPv6:2607:f8b0:400e:c01::22a]) by ietfa.amsl.com (Postfix) with ESMTP id 3811E21E80FD for ; Wed, 6 Nov 2013 14:52:37 -0800 (PST) Received: by mail-pb0-f42.google.com with SMTP id jt11so176310pbb.29 for ; Wed, 06 Nov 2013 14:52:36 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=references:mime-version:in-reply-to:content-type :content-transfer-encoding:message-id:cc:from:subject:date:to; bh=i4U90Z0WgDXrt8yzG23MgGUMXmW/jycwFeIDJYKRHRw=; b=r0k0xA+xFCBbbWNDX71aXO/3mw0kzSVbxHxi1qCdPRvxqvz0vgNhnYci84/m0/lQDy QvAsu9eTExMpBYcel/vhLZZaVkOip4nyYz5N5pI1hRjRT2KMMT+YbOMmN+q+cw+WqMrz +mBzEhrpFxpWjqQkVWE75FFwsrm48QMnrrZlyXi0ZKQ9vxon6UCAVfdGQ+lwFKRFHDst JzazbEskhhaYx8R9t87Me3NWmHAuoVHPHndB/UUNXkICL7ORn4Hjpw2rnecgtLIMif7U 6gpCM3mEMR9jBP/jCcM9ldSJIN71nJQqkoekDgBVZzwufxFOT8OStxRyvNHAM2QrnlGx xIdQ== X-Received: by 10.66.124.138 with SMTP id mi10mr6158870pab.141.1383778356561; Wed, 06 Nov 2013 14:52:36 -0800 (PST) Received: from ?IPv6:2001:67c:370:176:2935:8e18:f8a4:3a69? ([2001:67c:370:176:2935:8e18:f8a4:3a69]) by mx.google.com with ESMTPSA id o1sm423346pbe.37.2013.11.06.14.52.35 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Wed, 06 Nov 2013 14:52:35 -0800 (PST) References: <20131106184418.GL3809@um.es> <20131106192326.GO3809@um.es> <01d701cedb37$b68421c0$238c6540$@riw.us> <20131106214234.GP3809@um.es> Mime-Version: 1.0 (1.0) In-Reply-To: <20131106214234.GP3809@um.es> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Message-Id: <5B1B2570-660C-4088-88D7-07C78B193B02@gmail.com> X-Mailer: iPad Mail (11B511) From: Robert Raszuk Date: Wed, 6 Nov 2013 14:52:34 -0800 To: Pedro Martinez-Julia Cc: "sdn@irtf.org" Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 Nov 2013 22:52:51 -0000 The issue is that you perhaps do consider the complexity associated with dis= tribution from controller to network element required for forwarding data. All I can say that number of existing distributed routers do struggle a lot t= o distribute forwarding state from local RE/RP to local line cards. Most do i= t via fabric replication or local reliable multicast. Doing the same over ne= twork may work on slides or on lab with 5 routes but I am extremely pessimis= tic that you can do this over network at any decent scale. The you need to consider protection computation like LFAs which for each nod= e and each link will be different. It just does not make sense to centralize= everything. You centralize what you must and distribute what you can. Best, R. Sent from my iPad > On Nov 6, 2013, at 1:42 PM, Pedro Martinez-Julia wrote: >=20 >> On Wed, Nov 06, 2013 at 04:32:35PM -0500, Russ White wrote: >>=20 >>> Regarding your comment that igp-s are no longer needed we clearly have >>> different opinions and can agree to disagree here ;). >>=20 >> A world without IGPs would be like a world without... Well... Sliced brea= d? >> I don't know. Scary thought. >>=20 >=20 > I prefer to see a world where each "entity" is dedicated and specialized > to do its job, and dealing with IGP is not a good job for a forwarding > entity. The more functionality you include into the forwarding entity, > the less efficient it is. >=20 >> :-) >>=20 >> Russ=20 >>=20 >=20 > Regards, > Pedro >=20 > --=20 > Pedro Martinez-Julia > Department of Communication and Information Engineering > Faculty of Computer Science > University of Murcia > Email: pedromj@um.es > --------------------------------------------------------- > *** Entia non sunt multiplicanda praeter necessitatem *** > _______________________________________________ > sdn mailing list > sdn@irtf.org > https://www.irtf.org/mailman/listinfo/sdn From yaakov_s@rad.com Wed Nov 6 19:43:49 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D5CE311E8230 for ; Wed, 6 Nov 2013 19:43:03 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.442 X-Spam-Level: X-Spam-Status: No, score=-102.442 tagged_above=-999 required=5 tests=[AWL=-0.155, BAYES_00=-2.599, HOST_MISMATCH_COM=0.311, UNPARSEABLE_RELAY=0.001, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id KYsa+S2HiJBK for ; Wed, 6 Nov 2013 19:42:54 -0800 (PST) Received: from rad.co.il (mailrelay01-ib1.rad.com [94.188.133.165]) by ietfa.amsl.com (Postfix) with ESMTP id A6F6621E80C8 for ; Wed, 6 Nov 2013 19:42:51 -0800 (PST) Received: from Internal Mail-Server by MailRelay01 (envelope-from yaakov?s@rad.com) with RC4-SHA encrypted SMTP; 7 Nov 2013 05:42:47 +0200 Received: from EXRAD6.ad.rad.co.il (2002:c072:18be::c072:18be) by exrad6.ad.rad.co.il (2002:c072:18be::c072:18be) with Microsoft SMTP Server (TLS) id 15.0.712.24; Thu, 7 Nov 2013 05:42:20 +0200 Received: from EXRAD6.ad.rad.co.il ([fe80::f962:6fb8:5c46:a76a]) by exrad6.ad.rad.co.il ([fe80::f962:6fb8:5c46:a76a%20]) with mapi id 15.00.0712.012; Thu, 7 Nov 2013 05:42:02 +0200 From: Yaakov Stein To: Russ White , "sdn@irtf.org" Thread-Topic: [Sdn] Thoughts on Defining control and Management Planes Thread-Index: AQHO2xqln5belLyQLUuIkuyZNXbJhJoZGb3Q Date: Thu, 7 Nov 2013 03:42:01 +0000 Message-ID: References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [94.188.160.12] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Commtouch-Refid: str=0001.0A090207.527B0C37.0075, ss=1, re=0.100, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0 (Unknown) Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 07 Nov 2013 03:43:49 -0000 I would like to explain my comment at the meeting on the difference between= the two planes, and add something about why the difference between the two is important. In the olden days, three planes were defined - the data or user (or forward= ing) plane, the control plane, and the management plane. The difference between the latter two was less functional than operational. The control plane was fast and distributed and local. The management plane was anything that required, or at least enabled, human= intervention. As an example, OAM messages are user plane (since they fate share with user= data), but may trigger control protocol operations such as protection swit= ching, or may trigger alarms (management plane) or be used to collect statistics t= hat can be retrieved via the management plane. Over time more and more "intelligent" operations that were once performed b= y humans were replaced by software. However, two fundamental differences remained. First - since control plane operations are automatic they remain faster tha= n management plane operations.=20 Second - since humans were localized in NOCs the management intelligence re= mains centralized, while control protocols are distributed. Why did these two planes not fuse ?=20 Because there are operations that are better carried out locally,=20 and there are others that are better managed from a central management site= . The reason has to do with the CAP theorem. I don't have the room to fully explain this here, but the CAP theorem dictates that at most two of consistency, availability,= and partition tolerance can be achieved simultaneously. Here the calculation to be carried out is how to forward packets from ingre= ss to egress. In general, service providers are required to guarantee availability (e.g.,= five nines) and partition tolerance (e.g., 50 msec) for operational services, and they forgo consistency (which is why we need OAM and TTL fields).=20 This can be carried out by distributed local control planes, but not by cen= tralized management systems. However, there are tasks that require consistency and can give up availabil= ity, such as new service creation; these require a centralized management system (which is why service activation is slow - it is not immediately available)= . Network operations involves disciplined decision behind the use of one or t= he other plane for various tasks. What SDN has done is not so much separating the user plane from the control= plane -=20 that was well known (and as aforementioned this misses the management plane= ). What SDN does is remove the control plane and rename the centralized manage= ment plane to be "control" instead. It does so at the expense of emphasizing consistency, but losing the abilit= y to simultaneously guarantee availability and partition tolerance. Y(J)S -----Original Message----- From: sdn-bounces@irtf.org [mailto:sdn-bounces@irtf.org] On Behalf Of Russ = White Sent: 06 November, 2013 19:59 To: sdn@irtf.org Subject: [Sdn] Thoughts on Defining control and Management Planes Y'all: In the SDN meeting, there was some discussion over the management and contr= ol planes. I think defining these two is important in having consistent lan= guage (hermeneutics being a hobby of mine, among many others). To wit, a po= ssible set of definitions for consideration and discussion. Not claiming th= ese are perfect, but I do think we need to get past "this is faster than th= at," and other permeable boundaries. - control plane: Those processes / configuration which directly impacts the= information used to forward (or switch) traffic through a device. This wou= ld include distributed protocols, static configuration, etc. - management plane: Those processes or configuration that modify the operat= ion of the control plane, or the general operation of the device on which t= he control plane processes run. - data plane: The information and processes actually used to forward or pro= cess packets. So, for example: - OSPF is a control plane protocol - Configuring which interfaces OSPF runs on is a management function, since= it impacts the operation of a control plane protocol - FORCES is a control plane protocol ( in the main) A single SDN system might interact with all three, of course (though I tend= to believe these are different enough areas to warrant different solutions= ). I know there are probably hard cases that won't cleanly fit here, but we sh= ouldn't let platypuses disturb our ability to differentiate between a duck = and a beaver... Thoughts and discussion welcome, just would like to get thi= s nailed down so we can actually have a common language to work from. :-) Russ <>< russw@riw.us Ericsson _______________________________________________ sdn mailing list sdn@irtf.org https://www.irtf.org/mailman/listinfo/sdn From kireeti.kompella@gmail.com Wed Nov 6 20:09:19 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 01A7A11E8183 for ; Wed, 6 Nov 2013 20:09:19 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ColYFRF4JVVp for ; Wed, 6 Nov 2013 20:09:18 -0800 (PST) Received: from mail-qc0-x22e.google.com (mail-qc0-x22e.google.com [IPv6:2607:f8b0:400d:c01::22e]) by ietfa.amsl.com (Postfix) with ESMTP id 1483811E8147 for ; Wed, 6 Nov 2013 20:09:17 -0800 (PST) Received: by mail-qc0-f174.google.com with SMTP id v1so426qcw.33 for ; Wed, 06 Nov 2013 20:09:11 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=content-type:mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=K2XjemcgUVfPHZzxJed+ykfpSzdWp8cNMrsWR8JbqgM=; b=NfBUeXiQOSHIlYC+vXg+RzGZbDDvLcwcGYor9q+l4ZFqwO1hDoT+hqS0MK5gQpLWmP VPNm4QTa+j8Vac5YmXtH2J2x3xSKUp6IDwCmVFyOOr8bVwkzcRhuKhAYKH/GITb/uJoQ XiVkhi5/LSYyigjnk1+D+lVrI/GtTSlvtyrtDh79y6VwkpS9/U/rL0lPBivbWw1RZtxW fjhDUHmbiwZbdQSSVFvEuWCcSgvFUKuWcHCiyhnTWASfmI+EWgl+R8sqQA2caTzr0KDV AQU1lt4eC/MeDTIht1BlqYy9tTqlT+TmUxygUrW9n0/evQk4zv1mv0nL/gf8QhK+wjP/ N9YQ== X-Received: by 10.224.28.130 with SMTP id m2mr10507624qac.98.1383797350977; Wed, 06 Nov 2013 20:09:10 -0800 (PST) Received: from kireeti-sslvpn-nc.jnpr.net ([66.129.241.13]) by mx.google.com with ESMTPSA id a5sm5778242qae.2.2013.11.06.20.09.09 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Wed, 06 Nov 2013 20:09:10 -0800 (PST) Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 7.0 \(1816\)) From: Kireeti Kompella In-Reply-To: Date: Wed, 6 Nov 2013 20:09:12 -0800 Content-Transfer-Encoding: quoted-printable Message-Id: References: <1B0BF471-3E6C-452E-96B8-FD6C88256B0C@riw.us> To: Robert Raszuk X-Mailer: Apple Mail (2.1816) Cc: "sdn@irtf.org" Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 07 Nov 2013 04:09:19 -0000 Right on! On Nov 6, 2013, at 10:43 , Robert Raszuk wrote: > Russ, >=20 > IMHO we should take neither. Neither network nor device model works. >=20 > SDN is about service models and then it can be mapped to network to > realize it. of course networks consists of devices (physical or > virtual). >=20 > Such mapping can be done via some controller automation (example SDN = compiler). >=20 > So finding what service is the target (can be multiple) is like first > knowing where do you want to go on a map, before specifying your turn > by turn directions. >=20 > And of course there will be different set of directions depending what > "network" types you are traversing ... city, forest, sea, air will all > have very different results. >=20 > Best, > R. >=20 >=20 > On Wed, Nov 6, 2013 at 7:33 PM, Russ White wrote: >>=20 >> The first part of the question is, then, should we take a network = centric view of the question, or a device centric view. IMHO, as much as = I think the network as a whole is crucial, the only way actually move = forward with workable definitions is with a device centric view (from = which we build broader network level models). You've essentially = subsumed my entire model in one category within your model -- but I'm = afraid that If we start with the ocean, streams and rivers become = indistinguishable. >>=20 >> :-) >>=20 >> Russ >>=20 >>=20 >>=20 >> <>< >> russw@riw.us >> Ericsson >>=20 >>> On Nov 6, 2013, at 10:27 AM, Robert Raszuk = wrote: >>>=20 >>> Hi Russ, >>>=20 >>> To me network consists of three fundamental functional blocks: >>>=20 >>> -A- topology discovery (centralized or distributed) >>> -B- reachability computation/distribution/installation >>> -C- monitoring/configuration >>>=20 >>> Using your control plane vs management plane I see only the last one >>> -C- can be categorized quite clearly as the mgmt plane. >>>=20 >>> For -A- and -B- I have see real examples of complete mixture and any >>> attempt to put those in any of your basket will clearly fail. >>>=20 >>> Best, >>> R. >>>=20 >>>=20 >>>=20 >>>> On Wed, Nov 6, 2013 at 6:58 PM, Russ White wrote: >>>> Y'all: >>>>=20 >>>> In the SDN meeting, there was some discussion over the management = and control planes. I think defining these two is important in having = consistent language (hermeneutics being a hobby of mine, among many = others). To wit, a possible set of definitions for consideration and = discussion. Not claiming these are perfect, but I do think we need to = get past "this is faster than that," and other permeable boundaries. >>>>=20 >>>> - control plane: Those processes / configuration which directly = impacts the information used to forward (or switch) traffic through a = device. This would include distributed protocols, static configuration, = etc. >>>>=20 >>>> - management plane: Those processes or configuration that modify = the operation of the control plane, or the general operation of the = device on which the control plane processes run. >>>>=20 >>>> - data plane: The information and processes actually used to = forward or process packets. >>>>=20 >>>> So, for example: >>>>=20 >>>> - OSPF is a control plane protocol >>>> - Configuring which interfaces OSPF runs on is a management = function, since it impacts the operation of a control plane protocol >>>> - FORCES is a control plane protocol ( in the main) >>>>=20 >>>> A single SDN system might interact with all three, of course = (though I tend to believe these are different enough areas to warrant = different solutions). >>>>=20 >>>> I know there are probably hard cases that won't cleanly fit here, = but we shouldn't let platypuses disturb our ability to differentiate = between a duck and a beaver... Thoughts and discussion welcome, just = would like to get this nailed down so we can actually have a common = language to work from. >>>>=20 >>>> :-) >>>>=20 >>>> Russ >>>>=20 >>>>=20 >>>>=20 >>>> <>< >>>> russw@riw.us >>>> Ericsson >>>> _______________________________________________ >>>> sdn mailing list >>>> sdn@irtf.org >>>> https://www.irtf.org/mailman/listinfo/sdn > _______________________________________________ > sdn mailing list > sdn@irtf.org > https://www.irtf.org/mailman/listinfo/sdn From kireeti.kompella@gmail.com Wed Nov 6 20:13:12 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8A2C521E80F0 for ; Wed, 6 Nov 2013 20:13:12 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Qap-KaFZxTHp for ; Wed, 6 Nov 2013 20:13:12 -0800 (PST) Received: from mail-qe0-x22e.google.com (mail-qe0-x22e.google.com [IPv6:2607:f8b0:400d:c02::22e]) by ietfa.amsl.com (Postfix) with ESMTP id 0A04821E80E5 for ; Wed, 6 Nov 2013 20:13:11 -0800 (PST) Received: by mail-qe0-f46.google.com with SMTP id s14so5196qeb.19 for ; Wed, 06 Nov 2013 20:13:11 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=content-type:mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=cL4cn/7yCbny6LAEE6pvCoATVP89BEAOxEAh3LLq7Js=; b=I5iUoTuHWIQCV6Id9OabwPaVPdrlgZwE2lFw2O8Pl+2CTdDhq7z+lDCKuqYEHpHQYP /3gqbr7P2c280d8i9650MD/yorhByqkbumV/UwxL4yeMUrzwFTte6Xec8lWmvuI0pjcQ FzgorO29UEmie3PFg6Qeqri0eSLYKFrEOeQR7LlijFF2HptbVjVlIHd54vw7+jiOI1jW qEv+TKdrifl/Mx4Xsns07ToyURD7bEbFNGbgzeOTm/8G7GrsSqjJTu7NEb10/U5VOp95 INuLaC0WicvKwci91qbEgrT8J8RcagvJBIGbiBjjZdHipigEfeLLCac57b2C6kZ82cHC SQZA== X-Received: by 10.49.29.130 with SMTP id k2mr9270401qeh.20.1383797591544; Wed, 06 Nov 2013 20:13:11 -0800 (PST) Received: from kireeti-sslvpn-nc.jnpr.net ([66.129.241.13]) by mx.google.com with ESMTPSA id 4sm5737679qak.11.2013.11.06.20.13.10 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Wed, 06 Nov 2013 20:13:11 -0800 (PST) Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 7.0 \(1816\)) From: Kireeti Kompella In-Reply-To: <5B1B2570-660C-4088-88D7-07C78B193B02@gmail.com> Date: Wed, 6 Nov 2013 20:13:13 -0800 Content-Transfer-Encoding: quoted-printable Message-Id: <99D0BF21-FECB-44CC-8567-8F3B2BF5AA32@gmail.com> References: <20131106184418.GL3809@um.es> <20131106192326.GO3809@um.es> <01d701cedb37$b68421c0$238c6540$@riw.us> <20131106214234.GP3809@um.es> <5B1B2570-660C-4088-88D7-07C78B193B02@gmail.com> To: Robert Raszuk X-Mailer: Apple Mail (2.1816) Cc: "sdn@irtf.org" Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 07 Nov 2013 04:13:12 -0000 On Nov 6, 2013, at 14:52 , Robert Raszuk wrote: > You centralize what you must and distribute what you can. Right on! (again!) The difficulty for some folks (like me) is to drag our heads out of = distributing everything on principle, and understand when centralization = is a must.= From rraszuk@gmail.com Wed Nov 6 21:36:04 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id EF69E11E823C for ; Wed, 6 Nov 2013 21:36:04 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.663 X-Spam-Level: X-Spam-Status: No, score=-1.663 tagged_above=-999 required=5 tests=[AWL=0.315, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id I62GTvedDcfH for ; Wed, 6 Nov 2013 21:36:04 -0800 (PST) Received: from mail-ie0-x230.google.com (mail-ie0-x230.google.com [IPv6:2607:f8b0:4001:c03::230]) by ietfa.amsl.com (Postfix) with ESMTP id 65A8D11E8230 for ; Wed, 6 Nov 2013 21:36:04 -0800 (PST) Received: by mail-ie0-f176.google.com with SMTP id u16so96946iet.21 for ; Wed, 06 Nov 2013 21:36:03 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:date:message-id:subject :from:to:cc:content-type; bh=HBhmnGpjEPgLRiJbsK48l6ewHO0zYkbi/PblkiAeh3c=; b=c/cfY7yjYk87/3ZdElCAHSKya4aGPBYGkbcfn3Z/f60DDuwGbz5a1JpQevvVQlY6XN GNtsEsuW+Mr7BaDX3qWOPeijiGnqDg8Xaw7CzuBueQn3ai+pL+OoL8YvsBSm97LJ0yHS cVS/+pW5fR066CFBJ+ofItdi1bETdZqeBZwPcrQlXHjPF1byIptDcH4GimL8M3Z3KzHh 9BKcYcsZpa6xfme6vrbo5eJNKh0NR/cfg17eGUCh9ZjS7o5WUKooLWNKgF01eaS8RRdc RWIFd64pSjHQ3hgaPgtqcppoSzlBtwjmI28w1SLAhfTaqBQcPpJRJzbQS2FLFbGrm9Fl jTpA== MIME-Version: 1.0 X-Received: by 10.50.16.45 with SMTP id c13mr728443igd.55.1383802563563; Wed, 06 Nov 2013 21:36:03 -0800 (PST) Sender: rraszuk@gmail.com Received: by 10.64.61.129 with HTTP; Wed, 6 Nov 2013 21:36:03 -0800 (PST) In-Reply-To: <99D0BF21-FECB-44CC-8567-8F3B2BF5AA32@gmail.com> References: <20131106184418.GL3809@um.es> <20131106192326.GO3809@um.es> <01d701cedb37$b68421c0$238c6540$@riw.us> <20131106214234.GP3809@um.es> <5B1B2570-660C-4088-88D7-07C78B193B02@gmail.com> <99D0BF21-FECB-44CC-8567-8F3B2BF5AA32@gmail.com> Date: Thu, 7 Nov 2013 06:36:03 +0100 X-Google-Sender-Auth: j-WS1brwLVALP_lVkRejBiUqy7U Message-ID: From: Robert Raszuk To: Kireeti Kompella Content-Type: text/plain; charset=ISO-8859-1 Cc: "sdn@irtf.org" Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 07 Nov 2013 05:36:05 -0000 Hi Kireeti, >> You centralize what you must and distribute what you can. > > Right on! (again!) > > The difficulty for some folks (like me) is to drag our heads out of > distributing everything on principle, and understand when centralization > is a must. Indeed ! And as you know me I am not of much help here .. been to long around distributed protocols and saw how nicely they operate under very different circumstances to just turn 180 degrees around and say they are all *legacy* just because someone said so. And to go a bit more maybe it is worth to spend a moment to see what the issue is ? Folks complain running BGP is so complex .. developing it even worse. Well for those there is really well done BGP implementation of OpenContrail which those guys are free to use. I would consider at this point of time this topic as checked. Then we see enemies of IGPs .. OSPF and ISIS maybe even TRILL ... perhaps someone needs to found efforts to deliver solid open source of those components as well .. maybe Quagga will catch up .. maybe we will see other options .. but then one can take ODM box put Cumulus OS on it and run it as seems fit. If you run those on the box you can already claim SDN ! After all both data plane and contrail plane (ooops control plane) would be completely decoupled and even coming from many sources. Such modern new NG network or old fashioned legacy network can then focus on central PCE deployment for path computation, could deliver customized services like transport aware VPNs, could shift most services to data centers etc ... and this is where we should be looking for SDN killer apps. Not upside down from the Broadcom/Marvell ASICs up the stack. That's like climbing the ladder from the tip of the tree ;) Best, R. From russw@riw.us Wed Nov 6 21:59:50 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7F80C21E8090 for ; Wed, 6 Nov 2013 21:59:50 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.065 X-Spam-Level: X-Spam-Status: No, score=-2.065 tagged_above=-999 required=5 tests=[AWL=0.534, BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id P9uMyTBQaYeS for ; Wed, 6 Nov 2013 21:59:42 -0800 (PST) Received: from server.riw.us (server.riw.us [162.144.32.236]) by ietfa.amsl.com (Postfix) with ESMTP id 9D42E11E8242 for ; Wed, 6 Nov 2013 21:59:42 -0800 (PST) Received: from [64.114.24.114] (port=63199 helo=RussPC) by server.riw.us with esmtpsa (TLSv1:AES128-SHA:128) (Exim 4.80.1) (envelope-from ) id 1VeIcu-0000tC-P6; Thu, 07 Nov 2013 05:59:32 +0000 From: "Russ White" To: "'Kireeti Kompella'" , "'Robert Raszuk'" References: <20131106184418.GL3809@um.es> <20131106192326.GO3809@um.es> <01d701cedb37$b68421c0$238c6540$@riw.us> <20131106214234.GP3809@um.es> <5B1B2570-660C-4088-88D7-07C78B193B02@gmail.com> <99D0BF21-FECB-44CC-8567-8F3B2BF5AA32@gmail.com> In-Reply-To: <99D0BF21-FECB-44CC-8567-8F3B2BF5AA32@gmail.com> Date: Thu, 7 Nov 2013 00:59:37 -0500 Message-ID: <001a01cedb7e$8c043010$a40c9030$@riw.us> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Outlook 15.0 Thread-Index: AQENI0eiA8rOH7Iq3TRo8LAe8dZyDQN1fs+AAdnfhV4B1XWY0AMFmjmlAiqfHQQCL8e8UQEnnBpYAhy0Qa8B1cVbF5r/uipw Content-Language: en-us X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server.riw.us X-AntiAbuse: Original Domain - irtf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - riw.us X-Get-Message-Sender-Via: server.riw.us: authenticated_id: russw@riw.us X-Source: X-Source-Args: X-Source-Dir: Cc: sdn@irtf.org Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 07 Nov 2013 05:59:50 -0000 > The difficulty for some folks (like me) is to drag our heads out of distributing > everything on principle, and understand when centralization is a must. Of course --but that doesn't really help us determine a solid model to use... The point here is to find a model that can be used to accurately describe interactions and protocols at the device level, so we can sort and classify the APIs and protocols needed at this level, then figure out how those protocols and APIs relate to services and the network as a whole. I agree there is a need for higher level models to show how services interact, and how the network works as a whole, but we can't simply ignore that there are physical devices someplace connected to tangible wires that must switch real packets between two specific destinations in the network. If we can't describe what the pieces of that device are and how things outside that device interact with it, then all the services and network models in the world aren't going to get us from an architecture to actually making packets flow from point a to point b. One of the problems with the SDN space is we always start with the ocean and a thousand uncoordinated matches. Let's try with a single small cup and a large stove instead. So the services and network models are beautiful. I love drawing them on the board, and theorizing a ton of them out. But what about the device? To repeat: - Data: Information used to actually forward packets. - Control: protocols and processes used to build the information needed by the data plane. - Management: protocols, configuration, and processes that manage the device on which the control and data plane processes run, and configure/manage the control plane processes themselves. Seems pretty simple to me --it's not about speed (which can change), and it's not about remote/local, etc. I don't think it's perfect, but again, if we allow platypuses to define our model, we'll have a hard time with ducks and beavers. :-) Russ From rraszuk@gmail.com Wed Nov 6 22:10:11 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C284F11E8232 for ; Wed, 6 Nov 2013 22:10:10 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.673 X-Spam-Level: X-Spam-Status: No, score=-1.673 tagged_above=-999 required=5 tests=[AWL=0.305, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id tE8C2IWMurRF for ; Wed, 6 Nov 2013 22:10:09 -0800 (PST) Received: from mail-ie0-x22b.google.com (mail-ie0-x22b.google.com [IPv6:2607:f8b0:4001:c03::22b]) by ietfa.amsl.com (Postfix) with ESMTP id 907DA11E8242 for ; Wed, 6 Nov 2013 22:09:43 -0800 (PST) Received: by mail-ie0-f171.google.com with SMTP id tp5so133704ieb.2 for ; Wed, 06 Nov 2013 22:09:41 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:date:message-id:subject :from:to:cc:content-type; bh=kjcnZXnmiwOAFvBFlFC2b7K1IAWf3tr0T4/sEtsc36Y=; b=0c+dBIxLGYh8/01RMTnt1BYQiFw+LFu4aI16/AmcXavmH3olzs4I5lJJ6VP7ezG6th kyw/VImuO08f4nY9J4mGxHfXnNQ0oYpIYTBvLmKATK7gh9nfSiZazUE24kljdrn7ICPh ZBjzmY0djmSIP2ksoUqnjM0bHcCbGXekBuZzhTpTh1wChd0v7UG2Bp55zEC40M50Blhy aUHI/CaFIevzMI4vpOKH7Ji2lA7WB0zz6GJfDofIZUBdd3dQagRqq7fseeAVa5TvgOAO Pg4Sn0gBgUICdCNb9taSat99FpS0rXo6AusV31ZYC97mnrDrS3N4uNBYIJi1iCYeHjpX Pv4w== MIME-Version: 1.0 X-Received: by 10.42.94.208 with SMTP id c16mr4523432icn.18.1383804581363; Wed, 06 Nov 2013 22:09:41 -0800 (PST) Sender: rraszuk@gmail.com Received: by 10.64.61.129 with HTTP; Wed, 6 Nov 2013 22:09:41 -0800 (PST) In-Reply-To: <001a01cedb7e$8c043010$a40c9030$@riw.us> References: <20131106184418.GL3809@um.es> <20131106192326.GO3809@um.es> <01d701cedb37$b68421c0$238c6540$@riw.us> <20131106214234.GP3809@um.es> <5B1B2570-660C-4088-88D7-07C78B193B02@gmail.com> <99D0BF21-FECB-44CC-8567-8F3B2BF5AA32@gmail.com> <001a01cedb7e$8c043010$a40c9030$@riw.us> Date: Thu, 7 Nov 2013 07:09:41 +0100 X-Google-Sender-Auth: nlZqwcDl5azIT9J1pjSTFghTlM4 Message-ID: From: Robert Raszuk To: Russ White Content-Type: text/plain; charset=ISO-8859-1 Cc: Kireeti Kompella , SDN IRTF list Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 07 Nov 2013 06:10:11 -0000 Russ, Brilliant ! So what *SDN* "real physical device" do you have in mind ? URL would be great as well as pointer to its specification ! Maybe indeed we need to start from that, but I am afraid the discussion is going to be rather short ;-) Cheers, R. On Thu, Nov 7, 2013 at 6:59 AM, Russ White wrote: > >> The difficulty for some folks (like me) is to drag our heads out of > distributing >> everything on principle, and understand when centralization is a must. > > Of course --but that doesn't really help us determine a solid model to > use... The point here is to find a model that can be used to accurately > describe interactions and protocols at the device level, so we can sort and > classify the APIs and protocols needed at this level, then figure out how > those protocols and APIs relate to services and the network as a whole. > > I agree there is a need for higher level models to show how services > interact, and how the network works as a whole, but we can't simply ignore > that there are physical devices someplace connected to tangible wires that > must switch real packets between two specific destinations in the network. > If we can't describe what the pieces of that device are and how things > outside that device interact with it, then all the services and network > models in the world aren't going to get us from an architecture to actually > making packets flow from point a to point b. One of the problems with the > SDN space is we always start with the ocean and a thousand uncoordinated > matches. Let's try with a single small cup and a large stove instead. > > So the services and network models are beautiful. I love drawing them on the > board, and theorizing a ton of them out. But what about the device? To > repeat: > > - Data: Information used to actually forward packets. > - Control: protocols and processes used to build the information needed by > the data plane. > - Management: protocols, configuration, and processes that manage the device > on which the control and data plane processes run, and configure/manage the > control plane processes themselves. > > Seems pretty simple to me --it's not about speed (which can change), and > it's not about remote/local, etc. I don't think it's perfect, but again, if > we allow platypuses to define our model, we'll have a hard time with ducks > and beavers. > > :-) > > Russ > > From russw@riw.us Wed Nov 6 22:27:41 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2670021E8064 for ; Wed, 6 Nov 2013 22:27:35 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.243 X-Spam-Level: X-Spam-Status: No, score=-2.243 tagged_above=-999 required=5 tests=[AWL=0.356, BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id F4Fbdq5fP6Gb for ; Wed, 6 Nov 2013 22:27:29 -0800 (PST) Received: from server.riw.us (server.riw.us [162.144.32.236]) by ietfa.amsl.com (Postfix) with ESMTP id C734021F8E97 for ; Wed, 6 Nov 2013 22:27:28 -0800 (PST) Received: from [64.114.24.114] (port=63633 helo=RussPC) by server.riw.us with esmtpsa (TLSv1:AES128-SHA:128) (Exim 4.80.1) (envelope-from ) id 1VeJ3l-0001Bv-Td; Thu, 07 Nov 2013 06:27:22 +0000 From: "Russ White" To: "'Robert Raszuk'" References: <20131106184418.GL3809@um.es> <20131106192326.GO3809@um.es> <01d701cedb37$b68421c0$238c6540$@riw.us> <20131106214234.GP3809@um.es> <5B1B2570-660C-4088-88D7-07C78B193B02@gmail.com> <99D0BF21-FECB-44CC-8567-8F3B2BF5AA32@gmail.com> <001a01cedb7e$8c043010$a40c9030$@riw.us> In-Reply-To: Date: Thu, 7 Nov 2013 01:27:18 -0500 Message-ID: <000001cedb82$6c7f3330$457d9990$@riw.us> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Outlook 15.0 Thread-Index: AQENI0eiA8rOH7Iq3TRo8LAe8dZyDQN1fs+AAdnfhV4B1XWY0AMFmjmlAiqfHQQCL8e8UQEnnBpYAhy0Qa8B1cVbFwH9vdGKAlYqo3Wa3SLq0A== Content-Language: en-us X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server.riw.us X-AntiAbuse: Original Domain - irtf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - riw.us X-Get-Message-Sender-Via: server.riw.us: authenticated_id: russw@riw.us X-Source: X-Source-Args: X-Source-Dir: Cc: 'Kireeti Kompella' , 'SDN IRTF list' Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 07 Nov 2013 06:27:42 -0000 > Brilliant ! So what *SDN* "real physical device" do you have in mind ? Do you need an actual unicorn to describe what a unicorn should look like? :-) Being a research group, it's okay to attempt to describe things that might not exist in the real world (I hope). It might even be a useful exercise (if it can give us a channel for energy, so we don't keep building horses with horns all over the place in an attempt to finally get to a unicorn...) I'm hoping it's worth a try, at any rate. :-) Russ P.S. OTOH, I could ask for some pointers to an operational "services based network," that doesn't have any hardware to switch actual packets. :-) From rraszuk@gmail.com Wed Nov 6 22:43:15 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5D43121E80C3 for ; Wed, 6 Nov 2013 22:43:15 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.682 X-Spam-Level: X-Spam-Status: No, score=-1.682 tagged_above=-999 required=5 tests=[AWL=0.296, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id kLgPR6jVoSN8 for ; Wed, 6 Nov 2013 22:43:15 -0800 (PST) Received: from mail-ie0-x230.google.com (mail-ie0-x230.google.com [IPv6:2607:f8b0:4001:c03::230]) by ietfa.amsl.com (Postfix) with ESMTP id E9A3B11E810B for ; Wed, 6 Nov 2013 22:43:14 -0800 (PST) Received: by mail-ie0-f176.google.com with SMTP id u16so169194iet.7 for ; Wed, 06 Nov 2013 22:43:14 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:date:message-id:subject :from:to:cc:content-type; bh=iDzjjJurG2qPCp+HEay6SzH00cyUOqYte0zSlNpfhDI=; b=D4Ojb2CYFbl9Ko+X6MZRIHwjaHEH23+nAdWEsDBbQdAMe2MujkQ3DxCGGkCEx9RMfU ABYXKHkdt5+ym+fdoiiyn7Hpv9oP3VinFBZEOtFvm59MVUtXsju4UJhrONS3CqKOLZz/ zjMyifcfRatRt53KHyGTAPBfxsxW9ewdjVnFU7aRHQfdW5pw65+brkmnhc9KQwDFnldy cakC0EYFwPuthCRxZRRsGXYEbme8zE1g2CIkvUmwOn9jPsl7Qi9bmvTGtKz11fPPyYdm jJSZAoKMLdrxdgfv5RZrw5GkCiYxg6wcldbX0KX6Pi8f+ePxiN1k9nPv+/Tv44J2bB3J +RYg== MIME-Version: 1.0 X-Received: by 10.50.16.45 with SMTP id c13mr856813igd.55.1383806594306; Wed, 06 Nov 2013 22:43:14 -0800 (PST) Sender: rraszuk@gmail.com Received: by 10.64.61.129 with HTTP; Wed, 6 Nov 2013 22:43:14 -0800 (PST) In-Reply-To: <000001cedb82$6c7f3330$457d9990$@riw.us> References: <20131106184418.GL3809@um.es> <20131106192326.GO3809@um.es> <01d701cedb37$b68421c0$238c6540$@riw.us> <20131106214234.GP3809@um.es> <5B1B2570-660C-4088-88D7-07C78B193B02@gmail.com> <99D0BF21-FECB-44CC-8567-8F3B2BF5AA32@gmail.com> <001a01cedb7e$8c043010$a40c9030$@riw.us> <000001cedb82$6c7f3330$457d9990$@riw.us> Date: Thu, 7 Nov 2013 07:43:14 +0100 X-Google-Sender-Auth: RuVU9XElkB2TuaGmNJn0WfoqTy8 Message-ID: From: Robert Raszuk To: Russ White Content-Type: text/plain; charset=ISO-8859-1 Cc: Kireeti Kompella , SDN IRTF list Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 07 Nov 2013 06:43:15 -0000 Is purpose of this IRTF group to describe new imaginary model of non-existent physical device used for undefined set of services ? Don't we have enough of those "research" already elsewhere ? > P.S. OTOH, I could ask for some pointers to an operational "services > based network," that doesn't have any hardware to switch actual > packets. :-) That's simple .. all *overlay* services work equally well over any transport .. physical or virtual. But this was not the point. The point was to suggest focusing on SDN as service driven research to be able to map it later to any forwarding transport paradigm. That IMHO could be the most useful approach for applied research as opposed to spending time on theoretical/imaginary neverending discussions. From pedromj@um.es Thu Nov 7 00:27:20 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D16FD11E818A for ; Thu, 7 Nov 2013 00:27:20 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -5.999 X-Spam-Level: X-Spam-Status: No, score=-5.999 tagged_above=-999 required=5 tests=[AWL=0.600, BAYES_00=-2.599, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id CbHw3S7VrDt2 for ; Thu, 7 Nov 2013 00:27:14 -0800 (PST) Received: from xenon11.um.es (xenon11.um.es [155.54.212.165]) by ietfa.amsl.com (Postfix) with ESMTP id D449B11E80E0 for ; Thu, 7 Nov 2013 00:27:05 -0800 (PST) Received: from localhost (localhost [127.0.0.1]) by xenon11.um.es (Postfix) with ESMTP id 292A753BF3 for ; Thu, 7 Nov 2013 09:27:04 +0100 (CET) X-Virus-Scanned: by antispam in UMU at xenon11.um.es Received: from xenon11.um.es ([127.0.0.1]) by localhost (xenon11.um.es [127.0.0.1]) (amavisd-new, port 10024) with LMTP id BTUZBA44oCFf for ; Thu, 7 Nov 2013 09:27:03 +0100 (CET) Received: from localhost (1.Red-88-25-205.staticIP.rima-tde.net [88.25.205.1]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) (Authenticated sender: pedromj@um.es) by xenon11.um.es (Postfix) with ESMTPSA id A06C55395F for ; Thu, 7 Nov 2013 09:27:03 +0100 (CET) Date: Thu, 7 Nov 2013 09:27:10 +0100 From: Pedro Martinez-Julia To: sdn@irtf.org Message-ID: <20131107082710.GQ3809@um.es> References: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.22 (2013-10-16) Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 07 Nov 2013 08:27:20 -0000 On Thu, Nov 07, 2013 at 03:42:01AM +0000, Yaakov Stein wrote: > What SDN has done is not so much separating the user plane from the control plane - > that was well known (and as aforementioned this misses the management plane). > What SDN does is remove the control plane and rename the centralized management plane to be "control" instead. > It does so at the expense of emphasizing consistency, but losing the ability to simultaneously guarantee availability and partition tolerance. > Really? I don't think so. Maybe I am misunderstanding the SDN concept but, from my point of view, SDN provides enormous flexibility to the scene, so different networks can have different levels of control and management functions, either centralized or decentralized. With SDN you can still decide to keep the control model tightly coupled with the forwarding model, i.e. having a controller per switch/router, or you can decide the opposite, have just one centralized controller in charge of the control and to which you interact to achieve management. It is up to the network architect to determine the requirements of the network and translate them to a specific model. SDN enables you to do it. > > Y(J)S > Regards, Pedro -- Pedro Martinez-Julia Department of Communication and Information Engineering Faculty of Computer Science University of Murcia Email: pedromj@um.es --------------------------------------------------------- *** Entia non sunt multiplicanda praeter necessitatem *** From pedromj@um.es Thu Nov 7 01:38:55 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2BA8321E8131 for ; Thu, 7 Nov 2013 01:38:55 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -6.599 X-Spam-Level: X-Spam-Status: No, score=-6.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Zn0vlbD+mq1i for ; Thu, 7 Nov 2013 01:38:49 -0800 (PST) Received: from xenon14.um.es (xenon14.um.es [155.54.212.168]) by ietfa.amsl.com (Postfix) with ESMTP id 29F9B21E80DC for ; Thu, 7 Nov 2013 01:38:49 -0800 (PST) Received: from localhost (localhost [127.0.0.1]) by xenon14.um.es (Postfix) with ESMTP id 5A45D5D6C4 for ; Thu, 7 Nov 2013 10:38:47 +0100 (CET) X-Virus-Scanned: by antispam in UMU at xenon14.um.es Received: from xenon14.um.es ([127.0.0.1]) by localhost (xenon14.um.es [127.0.0.1]) (amavisd-new, port 10024) with LMTP id lEKmICQTsWkx for ; Thu, 7 Nov 2013 10:38:47 +0100 (CET) Received: from localhost (unknown [155.54.210.233]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) (Authenticated sender: pedromj@um.es) by xenon14.um.es (Postfix) with ESMTPSA id 0D5F85D6C1 for ; Thu, 7 Nov 2013 10:38:45 +0100 (CET) Date: Thu, 7 Nov 2013 10:38:52 +0100 From: Pedro Martinez-Julia To: sdn@irtf.org Message-ID: <20131107093852.GR3809@um.es> References: <20131106184418.GL3809@um.es> <20131106192326.GO3809@um.es> <01d701cedb37$b68421c0$238c6540$@riw.us> <20131106214234.GP3809@um.es> <5B1B2570-660C-4088-88D7-07C78B193B02@gmail.com> <99D0BF21-FECB-44CC-8567-8F3B2BF5AA32@gmail.com> <001a01cedb7e$8c043010$a40c9030$@riw.us> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <001a01cedb7e$8c043010$a40c9030$@riw.us> User-Agent: Mutt/1.5.22 (2013-10-16) Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 07 Nov 2013 09:38:55 -0000 On Thu, Nov 07, 2013 at 12:59:37AM -0500, Russ White wrote: > So the services and network models are beautiful. I love drawing them on the > board, and theorizing a ton of them out. But what about the device? To > repeat: > > - Data: Information used to actually forward packets. > - Control: protocols and processes used to build the information needed by > the data plane. > - Management: protocols, configuration, and processes that manage the device > on which the control and data plane processes run, and configure/manage the > control plane processes themselves. > Be careful with these definitions because they imply a single device for the control and data planes. More precise definitions are needed. For instance, the data plane definition should remark that its only function is to forward data packets without looking to their payload unless they are targeted at the device that forwards them. It could be difficult to have a single definition of the planes but I think that almost everybody agree in that there are three separate planes and also agree in the spirit behind this separation. We should begin at this point to build some consistent and agreed definitions of the planes. Something like a wiki page to gather different definitions and work on them to refine a potential single definition could be good to reach a good level of agreement. > Russ > Regards, Pedro -- Pedro Martinez-Julia Department of Communication and Information Engineering Faculty of Computer Science University of Murcia Email: pedromj@um.es --------------------------------------------------------- *** Entia non sunt multiplicanda praeter necessitatem *** From russw@riw.us Thu Nov 7 05:49:17 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4EAB611E8168 for ; Thu, 7 Nov 2013 05:49:17 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.294 X-Spam-Level: X-Spam-Status: No, score=-2.294 tagged_above=-999 required=5 tests=[AWL=0.305, BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id oW9OlmgSeOWP for ; Thu, 7 Nov 2013 05:48:57 -0800 (PST) Received: from server.riw.us (server.riw.us [162.144.32.236]) by ietfa.amsl.com (Postfix) with ESMTP id 20AE411E819C for ; Thu, 7 Nov 2013 05:48:56 -0800 (PST) Received: from [64.114.24.114] (port=64322 helo=RussPC) by server.riw.us with esmtpsa (TLSv1:AES128-SHA:128) (Exim 4.80.1) (envelope-from ) id 1VePx5-0006PF-Qc; Thu, 07 Nov 2013 13:48:52 +0000 From: "Russ White" To: "'Pedro Martinez-Julia'" , References: <20131106184418.GL3809@um.es> <20131106192326.GO3809@um.es> <01d701cedb37$b68421c0$238c6540$@riw.us> <20131106214234.GP3809@um.es> <5B1B2570-660C-4088-88D7-07C78B193B02@gmail.com> <99D0BF21-FECB-44CC-8567-8F3B2BF5AA32@gmail.com> <001a01cedb7e$8c043010$a40c9030$@riw.us> <20131107093852.GR3809@um.es> In-Reply-To: <20131107093852.GR3809@um.es> Date: Thu, 7 Nov 2013 08:48:57 -0500 Message-ID: <019b01cedbc0$1bf507d0$53df1770$@riw.us> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Outlook 15.0 Thread-Index: AQN1fs+A4hyCwlhOvddyi6X6/mjl2gHZ34VeAdV1mNADBZo5pQIqnx0EAi/HvFEBJ5waWAIctEGvAdXFWxcB/b3RigH1jKcqliuYAfA= Content-Language: en-us X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server.riw.us X-AntiAbuse: Original Domain - irtf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - riw.us X-Get-Message-Sender-Via: server.riw.us: authenticated_id: russw@riw.us X-Source: X-Source-Args: X-Source-Dir: Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 07 Nov 2013 13:49:17 -0000 > > - Data: Information used to actually forward packets. > > - Control: protocols and processes used to build the information > > needed by the data plane. > > - Management: protocols, configuration, and processes that manage the > > device on which the control and data plane processes run, and > > configure/manage the control plane processes themselves. > > > > Be careful with these definitions because they imply a single device for the > control and data planes. Two points: - They're designed to represent a single device. I'm trying to represent a single device intentionally for a specific reason (see below). - The way you get to groups of devices is by combining groups of actual devices. I understand the need for models that capture the behavior of groups of devices, as well, but I don't understand how such models can be useful when actually interacting with single devices. In other words, if you have a model for a network, that's all fine and dandy, but that model has to eventually interact with the actual single devices that make up the "network" at some point. Hand waving and saying, "we don't care about single devices," won't work -- somehow the information required to switch actual packets must be sent to and managed on actual physical individual devices. > More precise definitions are needed. For instance, the data plane definition > should remark that its only function is to forward data packets without > looking to their payload unless they are targeted at the device that forwards > them. This isn't more precise, it is g --it is jumping to the network model. There's nothing wrong with network models --we need such things-- but now you have this generalized data plane containing all the information across ten thousand devices. Great. How do you actually install the data plane information on each of those ten thousand devices? What is the protocol? What is the model? OTOH, vendors and people who manage these networks also need to know how the individual device they're building, or that's sitting in front of their face in a rack in the real world, interact with that network model. I could, for instance, say, "OSPF's control plane is the shared database across all the devices in a flooding domain," and I'd be right. But that doesn't tell me anything about how that database was shared, or how it's used, or how consistency is (roughly) enforced, or how mismatches between the topology and the database are detected, etc. Those things are all at the individual device level, and would need to be modeled as interactions between individual devices. Both models are useful, and both are also necessary. > It could be difficult to have a single definition of the planes but I think that > almost everybody agree in that there are three separate planes and also > agree in the spirit behind this separation. We should begin at this point to > build some consistent and agreed definitions of the planes. That's the problem with network level models --there are too many definitions, and they vary according to the application and protocols in place. Part of the reason we're spinning around without a lot of progress in actually researching is that when you work from the network model, the only option you have is to say, "well, we did this using this model," and "we did that using that model." IMHO, one way forward is to impose a model for an individual device so we at least start with that one thing in common, and then let's see where we can go from there. I'm not positing that we limit ourselves to a single device model, only that we start there, because I think we can actually get to a single device model everyone can agree on if we think about it hard enough. Once we get that piece in place, we have common ground to start talking about network and service models in relation to the single device model we all share. :-) Russ From russw@riw.us Thu Nov 7 06:08:23 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id F1E6811E826D for ; Thu, 7 Nov 2013 06:08:22 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.332 X-Spam-Level: X-Spam-Status: No, score=-2.332 tagged_above=-999 required=5 tests=[AWL=0.267, BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id t9RA8X-SKTKk for ; Thu, 7 Nov 2013 06:08:16 -0800 (PST) Received: from server.riw.us (server.riw.us [162.144.32.236]) by ietfa.amsl.com (Postfix) with ESMTP id 14FA211E8186 for ; Thu, 7 Nov 2013 06:07:38 -0800 (PST) Received: from [64.114.24.114] (port=64376 helo=RussPC) by server.riw.us with esmtpsa (TLSv1:AES128-SHA:128) (Exim 4.80.1) (envelope-from ) id 1VeQFC-0006eQ-Pq; Thu, 07 Nov 2013 14:07:35 +0000 From: "Russ White" To: "'Robert Raszuk'" References: <20131106184418.GL3809@um.es> <20131106192326.GO3809@um.es> <01d701cedb37$b68421c0$238c6540$@riw.us> <20131106214234.GP3809@um.es> <5B1B2570-660C-4088-88D7-07C78B193B02@gmail.com> <99D0BF21-FECB-44CC-8567-8F3B2BF5AA32@gmail.com> <001a01cedb7e$8c043010$a40c9030$@riw.us> <000001cedb82$6c7f3330$457d9990$@riw.us> In-Reply-To: Date: Thu, 7 Nov 2013 09:07:40 -0500 Message-ID: <01b601cedbc2$b94d1ca0$2be755e0$@riw.us> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Outlook 15.0 Thread-Index: AQENI0eiA8rOH7Iq3TRo8LAe8dZyDQN1fs+AAdnfhV4B1XWY0AMFmjmlAiqfHQQCL8e8UQEnnBpYAhy0Qa8B1cVbFwH9vdGKAlYqo3UCJlskYgIabcNYmrudrjA= Content-Language: en-us X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server.riw.us X-AntiAbuse: Original Domain - irtf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - riw.us X-Get-Message-Sender-Via: server.riw.us: authenticated_id: russw@riw.us X-Source: X-Source-Args: X-Source-Dir: Cc: 'Kireeti Kompella' , 'SDN IRTF list' Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 07 Nov 2013 14:08:23 -0000 > Is purpose of this IRTF group to describe new imaginary model of non- > existent physical device used for undefined set of services ? I thought the purpose was to research into the purpose and applications of SDNs, to help guide the work of various IETF working groups working in this space. IMHO, one of the fundamental things we can do here is to build the models and definitions needed to have common ground so we can talk about such things. Saying, "here is a limitless number of service models to work from, choose according to your need," isn't particularly useful unless you have some way to actually instantiate some of those models on individual devices. :-) Let me point something out that might not be so obvious, but I think is fairly interesting. We have at least four widely deployed IGPs in the wild, and one widely deployed EGP. All of them share the same model of a single device, and work from that same model when defining the protocols and network models from which they work. I don't think this was a conscious decision, but rather a matter of the interaction of the hardware and software. This "single device model," isn't the only model in play, but it sets a baseline which is useful to all the protocols, and helps everyone have discussions around how those protocols work, etc. > > P.S. OTOH, I could ask for some pointers to an operational "services > > based network," that doesn't have any hardware to switch actual > > packets. :-) > > That's simple .. all *overlay* services work equally well over any transport .. Overlay networks are called "overlay networks," because they overlay some actual physical network which presumably has physical devices forwarding individual packets. At least I don't know of any overlay network that has become so abstract that it doesn't have to run on physical hardware someplace or another in the final analysis... I guess white board demonstrations might count, but I'm not certain how many folks will pay for a white board network, rather than a real world one. > The point was to suggest focusing on SDN as service driven research to be > able to map it later to any forwarding transport paradigm. That IMHO could > be the most useful approach for applied research as opposed to spending > time on theoretical/imaginary neverending discussions. My point is that focusing on service models will lead us to a never ending spin on the different service models available, and we won't be able to map any of it to any sort of transport because we won't have a single model onto which to map all these services (or rather to instantiate them). If we start from the other end, then we actually have a common model where, when someone presents a new service model, we can say, "how does this map onto actual physical devices that forward real packets?" It provides a ground from which to work. Castles in the air are great, but you either need to ground them (turning them into fog, like all good cloud designs), or you can just watch while they blow away, to be replaced by another beautiful cloud in ten minutes. :-) Russ From sarlimatti@gmail.com Thu Nov 7 06:23:13 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7D6B911E8270 for ; Thu, 7 Nov 2013 06:23:13 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.197 X-Spam-Level: X-Spam-Status: No, score=-2.197 tagged_above=-999 required=5 tests=[AWL=0.402, BAYES_00=-2.599, HTML_MESSAGE=0.001, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id zEJvIyxuMFLh for ; Thu, 7 Nov 2013 06:23:11 -0800 (PST) Received: from mail-pd0-x229.google.com (mail-pd0-x229.google.com [IPv6:2607:f8b0:400e:c02::229]) by ietfa.amsl.com (Postfix) with ESMTP id B0FC411E8287 for ; Thu, 7 Nov 2013 06:23:08 -0800 (PST) Received: by mail-pd0-f169.google.com with SMTP id q10so664684pdj.0 for ; Thu, 07 Nov 2013 06:23:08 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:date:message-id:subject:from:to:content-type; bh=Kpbr31MSt7M4qIZS3aXI/zSn++pv1m+LSMt0IzaynZA=; b=V/I7ec6gBZQRKobDCM5EAg7Pi0NNSbJrApyXbrBU+aqNhFoXiZaaWh69A1yWMV0Nls eQdCEAiklVGsELZ3QOd2sOXVtBOeK6q77j3Z//7UF4Irt2znecIo/Mx+2uIX01fIcHRF ny5jL3KuH6QQ/Nart/h91WDlyWVVS/utUSESHv5ltUZrPihkhrm1g/P27gSvC0zN0sMF shFjg856yqFLw24qwIYwwGI9RimnfSys8WUMtEWl3LMW5Pj7DlbF5pELvEMbpmfx+FLN x4x0o34ono0C1z+Jzkc+RZfNmFu3N6EbPyZml+ClbcJ4tHYp3kuWPZenQabqx3cJ191L ynSA== MIME-Version: 1.0 X-Received: by 10.66.142.193 with SMTP id ry1mr10074222pab.150.1383834188295; Thu, 07 Nov 2013 06:23:08 -0800 (PST) Received: by 10.70.28.161 with HTTP; Thu, 7 Nov 2013 06:23:08 -0800 (PST) Date: Thu, 7 Nov 2013 22:23:08 +0800 Message-ID: From: Shivleela Arlimatti To: sdn@irtf.org Content-Type: multipart/alternative; boundary=001a113450c238b8b604ea97012b Subject: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 07 Nov 2013 14:23:13 -0000 --001a113450c238b8b604ea97012b Content-Type: text/plain; charset=ISO-8859-1 after reading all this really we beginners get confused. If we remove control plane and redefine it as centralized manager? according to me if we do this control plane will be in the control of end users...Then it may be difficult to manage the network because management layer applications are different as control plane applications. Shivaleela Arlimatti Research scholar, InterNetworks Research Lab, CAS UUM Sintok, Malaysia. On Thu, Nov 7, 2013 at 4:27 PM, wrote: > If you have received this digest without all the individual message > attachments you will need to update your digest options in your list > subscription. To do so, go to > > https://www.irtf.org/mailman/listinfo/sdn > > Click the 'Unsubscribe or edit options' button, log in, and set "Get > MIME or Plain Text Digests?" to MIME. You can set this option > globally for all the list digests you receive at this point. > > > > Send sdn mailing list submissions to > sdn@irtf.org > > To subscribe or unsubscribe via the World Wide Web, visit > https://www.irtf.org/mailman/listinfo/sdn > or, via email, send a message with subject or body 'help' to > sdn-request@irtf.org > > You can reach the person managing the list at > sdn-owner@irtf.org > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of sdn digest..." > > > Today's Topics: > > 1. Re: Thoughts on Defining control and Management Planes > (Kireeti Kompella) > 2. Re: Thoughts on Defining control and Management Planes > (Robert Raszuk) > 3. Re: Thoughts on Defining control and Management Planes > (Russ White) > 4. Re: Thoughts on Defining control and Management Planes > (Robert Raszuk) > 5. Re: Thoughts on Defining control and Management Planes > (Russ White) > 6. Re: Thoughts on Defining control and Management Planes > (Robert Raszuk) > 7. Re: Thoughts on Defining control and Management Planes > (Pedro Martinez-Julia) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Wed, 6 Nov 2013 20:13:13 -0800 > From: Kireeti Kompella > To: Robert Raszuk > Cc: "sdn@irtf.org" > Subject: Re: [Sdn] Thoughts on Defining control and Management Planes > Message-ID: <99D0BF21-FECB-44CC-8567-8F3B2BF5AA32@gmail.com> > Content-Type: text/plain; charset=us-ascii > > On Nov 6, 2013, at 14:52 , Robert Raszuk wrote: > > > You centralize what you must and distribute what you can. > > Right on! (again!) > > The difficulty for some folks (like me) is to drag our heads out of > distributing everything on principle, and understand when centralization is > a must. > > ------------------------------ > > Message: 2 > Date: Thu, 7 Nov 2013 06:36:03 +0100 > From: Robert Raszuk > To: Kireeti Kompella > Cc: "sdn@irtf.org" > Subject: Re: [Sdn] Thoughts on Defining control and Management Planes > Message-ID: > WjDeC-pOCMzp5oTu3qz+_0U9eFCdcOVzm40K63Xhhtw@mail.gmail.com> > Content-Type: text/plain; charset=ISO-8859-1 > > Hi Kireeti, > > >> You centralize what you must and distribute what you can. > > > > Right on! (again!) > > > > The difficulty for some folks (like me) is to drag our heads out of > > distributing everything on principle, and understand when centralization > > is a must. > > Indeed ! And as you know me I am not of much help here .. been to long > around distributed protocols and saw how nicely they operate under > very different circumstances to just turn 180 degrees around and say > they are all *legacy* just because someone said so. > > And to go a bit more maybe it is worth to spend a moment to see what > the issue is ? Folks complain running BGP is so complex .. developing > it even worse. Well for those there is really well done BGP > implementation of OpenContrail which those guys are free to use. I > would consider at this point of time this topic as checked. > > Then we see enemies of IGPs .. OSPF and ISIS maybe even TRILL ... > perhaps someone needs to found efforts to deliver solid open source of > those components as well .. maybe Quagga will catch up .. maybe we > will see other options .. but then one can take ODM box put Cumulus OS > on it and run it as seems fit. > > If you run those on the box you can already claim SDN ! After all both > data plane and contrail plane (ooops control plane) would be > completely decoupled and even coming from many sources. > > Such modern new NG network or old fashioned legacy network can then > focus on central PCE deployment for path computation, could deliver > customized services like transport aware VPNs, could shift most > services to data centers etc ... and this is where we should be > looking for SDN killer apps. Not upside down from the Broadcom/Marvell > ASICs up the stack. That's like climbing the ladder from the tip of > the tree ;) > > Best, > R. > > > ------------------------------ > > Message: 3 > Date: Thu, 7 Nov 2013 00:59:37 -0500 > From: "Russ White" > To: "'Kireeti Kompella'" , "'Robert > Raszuk'" > Cc: sdn@irtf.org > Subject: Re: [Sdn] Thoughts on Defining control and Management Planes > Message-ID: <001a01cedb7e$8c043010$a40c9030$@riw.us> > Content-Type: text/plain; charset="us-ascii" > > > > The difficulty for some folks (like me) is to drag our heads out of > distributing > > everything on principle, and understand when centralization is a must. > > Of course --but that doesn't really help us determine a solid model to > use... The point here is to find a model that can be used to accurately > describe interactions and protocols at the device level, so we can sort and > classify the APIs and protocols needed at this level, then figure out how > those protocols and APIs relate to services and the network as a whole. > > I agree there is a need for higher level models to show how services > interact, and how the network works as a whole, but we can't simply ignore > that there are physical devices someplace connected to tangible wires that > must switch real packets between two specific destinations in the network. > If we can't describe what the pieces of that device are and how things > outside that device interact with it, then all the services and network > models in the world aren't going to get us from an architecture to actually > making packets flow from point a to point b. One of the problems with the > SDN space is we always start with the ocean and a thousand uncoordinated > matches. Let's try with a single small cup and a large stove instead. > > So the services and network models are beautiful. I love drawing them on > the > board, and theorizing a ton of them out. But what about the device? To > repeat: > > - Data: Information used to actually forward packets. > - Control: protocols and processes used to build the information needed by > the data plane. > - Management: protocols, configuration, and processes that manage the > device > on which the control and data plane processes run, and configure/manage the > control plane processes themselves. > > Seems pretty simple to me --it's not about speed (which can change), and > it's not about remote/local, etc. I don't think it's perfect, but again, if > we allow platypuses to define our model, we'll have a hard time with ducks > and beavers. > > :-) > > Russ > > > > > ------------------------------ > > Message: 4 > Date: Thu, 7 Nov 2013 07:09:41 +0100 > From: Robert Raszuk > To: Russ White > Cc: Kireeti Kompella , SDN IRTF list > > Subject: Re: [Sdn] Thoughts on Defining control and Management Planes > Message-ID: > < > CA+b+ERkZv_z75Wr5tPfzhYt+WserFT-PoHMe_GXnw0t54S+cGA@mail.gmail.com> > Content-Type: text/plain; charset=ISO-8859-1 > > Russ, > > Brilliant ! So what *SDN* "real physical device" do you have in mind ? > > URL would be great as well as pointer to its specification ! > > Maybe indeed we need to start from that, but I am afraid the > discussion is going to be rather short ;-) > > Cheers, > R. > > On Thu, Nov 7, 2013 at 6:59 AM, Russ White wrote: > > > >> The difficulty for some folks (like me) is to drag our heads out of > > distributing > >> everything on principle, and understand when centralization is a must. > > > > Of course --but that doesn't really help us determine a solid model to > > use... The point here is to find a model that can be used to accurately > > describe interactions and protocols at the device level, so we can sort > and > > classify the APIs and protocols needed at this level, then figure out how > > those protocols and APIs relate to services and the network as a whole. > > > > I agree there is a need for higher level models to show how services > > interact, and how the network works as a whole, but we can't simply > ignore > > that there are physical devices someplace connected to tangible wires > that > > must switch real packets between two specific destinations in the > network. > > If we can't describe what the pieces of that device are and how things > > outside that device interact with it, then all the services and network > > models in the world aren't going to get us from an architecture to > actually > > making packets flow from point a to point b. One of the problems with the > > SDN space is we always start with the ocean and a thousand uncoordinated > > matches. Let's try with a single small cup and a large stove instead. > > > > So the services and network models are beautiful. I love drawing them on > the > > board, and theorizing a ton of them out. But what about the device? To > > repeat: > > > > - Data: Information used to actually forward packets. > > - Control: protocols and processes used to build the information needed > by > > the data plane. > > - Management: protocols, configuration, and processes that manage the > device > > on which the control and data plane processes run, and configure/manage > the > > control plane processes themselves. > > > > Seems pretty simple to me --it's not about speed (which can change), and > > it's not about remote/local, etc. I don't think it's perfect, but again, > if > > we allow platypuses to define our model, we'll have a hard time with > ducks > > and beavers. > > > > :-) > > > > Russ > > > > > > > ------------------------------ > > Message: 5 > Date: Thu, 7 Nov 2013 01:27:18 -0500 > From: "Russ White" > To: "'Robert Raszuk'" > Cc: 'Kireeti Kompella' , 'SDN IRTF list' > > Subject: Re: [Sdn] Thoughts on Defining control and Management Planes > Message-ID: <000001cedb82$6c7f3330$457d9990$@riw.us> > Content-Type: text/plain; charset="us-ascii" > > > > Brilliant ! So what *SDN* "real physical device" do you have in mind ? > > Do you need an actual unicorn to describe what a unicorn should look like? > :-) Being a research group, it's okay to attempt to describe things that > might not exist in the real world (I hope). It might even be a useful > exercise (if it can give us a channel for energy, so we don't keep building > horses with horns all over the place in an attempt to finally get to a > unicorn...) I'm hoping it's worth a try, at any rate. > > :-) > > Russ > > P.S. OTOH, I could ask for some pointers to an operational "services based > network," that doesn't have any hardware to switch actual packets. :-) > > > > > ------------------------------ > > Message: 6 > Date: Thu, 7 Nov 2013 07:43:14 +0100 > From: Robert Raszuk > To: Russ White > Cc: Kireeti Kompella , SDN IRTF list > > Subject: Re: [Sdn] Thoughts on Defining control and Management Planes > Message-ID: > < > CA+b+ERmHHWuXscdazrSXS3ejKuFTe1GsmhMaPc9bT4YMzDenKw@mail.gmail.com> > Content-Type: text/plain; charset=ISO-8859-1 > > Is purpose of this IRTF group to describe new imaginary model of > non-existent physical device used for undefined set of services ? > > Don't we have enough of those "research" already elsewhere ? > > > P.S. OTOH, I could ask for some pointers to an operational "services > > based network," that doesn't have any hardware to switch actual > > packets. :-) > > That's simple .. all *overlay* services work equally well over any > transport .. physical or virtual. But this was not the point. > > The point was to suggest focusing on SDN as service driven research to > be able to map it later to any forwarding transport paradigm. That > IMHO could be the most useful approach for applied research as opposed > to spending time on theoretical/imaginary neverending discussions. > > > ------------------------------ > > Message: 7 > Date: Thu, 7 Nov 2013 09:27:10 +0100 > From: Pedro Martinez-Julia > To: sdn@irtf.org > Subject: Re: [Sdn] Thoughts on Defining control and Management Planes > Message-ID: <20131107082710.GQ3809@um.es> > Content-Type: text/plain; charset=utf-8 > > On Thu, Nov 07, 2013 at 03:42:01AM +0000, Yaakov Stein wrote: > > What SDN has done is not so much separating the user plane from the > control plane - > > that was well known (and as aforementioned this misses the management > plane). > > What SDN does is remove the control plane and rename the centralized > management plane to be "control" instead. > > It does so at the expense of emphasizing consistency, but losing the > ability to simultaneously guarantee availability and partition tolerance. > > > > Really? I don't think so. Maybe I am misunderstanding the SDN concept > but, from my point of view, SDN provides enormous flexibility to the > scene, so different networks can have different levels of control and > management functions, either centralized or decentralized. With SDN you > can still decide to keep the control model tightly coupled with the > forwarding model, i.e. having a controller per switch/router, or you can > decide the opposite, have just one centralized controller in charge of > the control and to which you interact to achieve management. It is up to > the network architect to determine the requirements of the network and > translate them to a specific model. SDN enables you to do it. > > > > > Y(J)S > > > > Regards, > Pedro > > -- > Pedro Martinez-Julia > Department of Communication and Information Engineering > Faculty of Computer Science > University of Murcia > Email: pedromj@um.es > --------------------------------------------------------- > *** Entia non sunt multiplicanda praeter necessitatem *** > > > ------------------------------ > > _______________________________________________ > sdn mailing list > sdn@irtf.org > https://www.irtf.org/mailman/listinfo/sdn > > > End of sdn Digest, Vol 19, Issue 8 > ********************************** > --001a113450c238b8b604ea97012b Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
after reading all this really we beginners get confused. = =A0If we remove control plane =A0and redefine it as centralized manager? ac= cording to me if we do this control plane will be in the control of end use= rs...Then it may be difficult to manage the network because management laye= r applications are different as control plane applications.=A0

Shivalee= la Arlimatti
Research scholar,
InterNetworks Research Lab, CA= S
UUM Sintok, Malaysia.=A0


On Thu, Nov 7, 2013 at 4:27 PM, <sd= n-request@irtf.org> wrote:
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Today's Topics:

=A0 =A01. Re: Thoughts on Defining control and Management Planes
=A0 =A0 =A0 (Kireeti Kompella)
=A0 =A02. Re: Thoughts on Defining control and Management Planes
=A0 =A0 =A0 (Robert Raszuk)
=A0 =A03. Re: Thoughts on Defining control and Management Planes
=A0 =A0 =A0 (Russ White)
=A0 =A04. Re: Thoughts on Defining control and Management Planes
=A0 =A0 =A0 (Robert Raszuk)
=A0 =A05. Re: Thoughts on Defining control and Management Planes
=A0 =A0 =A0 (Russ White)
=A0 =A06. Re: Thoughts on Defining control and Management Planes
=A0 =A0 =A0 (Robert Raszuk)
=A0 =A07. Re: Thoughts on Defining control and Management Planes
=A0 =A0 =A0 (Pedro Martinez-Julia)


----------------------------------------------------------------------

Message: 1
Date: Wed, 6 Nov 2013 20:13:13 -0800
From: Kireeti Kompella <ki= reeti.kompella@gmail.com>
To: Robert Raszuk <rraszuk@gmail.co= m>
Cc: "sdn@irtf.org" <sdn@irtf.org>
Subject: Re: [Sdn] Thoughts on Defining control and Management Planes
Message-ID: <99D0BF21-FECB-44CC-8567-8F3B2BF5AA32@gmail.com>
Content-Type: text/plain; charset=3Dus-ascii

On Nov 6, 2013, at 14:52 , Robert Raszuk <rraszuk@gmail.com> wrote:

> You centralize what you must and distribute what you can.

Right on! =A0(again!)

The difficulty for some folks (like me) is to drag our heads out of distrib= uting everything on principle, and understand when centralization is a must= .

------------------------------

Message: 2
Date: Thu, 7 Nov 2013 06:36:03 +0100
From: Robert Raszuk <robert@raszuk.= net>
To: Kireeti Kompella <kire= eti.kompella@gmail.com>
Cc: "sdn@irtf.org" <sdn@irtf.org>
Subject: Re: [Sdn] Thoughts on Defining control and Management Planes
Message-ID:
=A0 =A0 =A0 =A0 <CA+b+ER=3DWjDeC-pOCMzp5oTu3qz+_0U9eFCdcOVzm40K63Xh= htw@mail.gmail.com>
Content-Type: text/plain; charset=3DISO-8859-1

Hi Kireeti,

>> You centralize what you must and distribute what you can.
>
> Right on! =A0(again!)
>
> The difficulty for some folks (like me) is to drag our heads out of > distributing everything on principle, and understand when centralizati= on
> is a must.

Indeed ! And as you know me I am not of much help here .. been to long
around distributed protocols and saw how nicely they operate under
very different circumstances to just turn 180 degrees around and say
they are all *legacy* just because someone said so.

And to go a bit more maybe it is worth to spend a moment to see what
the issue is ? Folks complain running BGP is so complex .. developing
it even worse. Well for those there is really well done BGP
implementation of OpenContrail which those guys are free to use. I
would consider at this point of time this topic as checked.

Then we see enemies of IGPs .. OSPF and ISIS maybe even TRILL ...
perhaps someone needs to found efforts to deliver solid open source of
those components as well .. maybe Quagga will catch up .. maybe we
will see other options .. but then one can take ODM box put Cumulus OS
on it and run it as seems fit.

If you run those on the box you can already claim SDN ! After all both
data plane and contrail plane (ooops control plane) would be
completely decoupled and even coming from many sources.

Such modern new NG network or old fashioned legacy network can then
focus =A0on central PCE deployment for path computation, could deliver
customized services like transport aware VPNs, could shift most
services to data centers etc ... and this is where we should be
looking for SDN killer apps. Not upside down from the Broadcom/Marvell
ASICs up the stack. That's like climbing the ladder from the tip of
the tree ;)

Best,
R.


------------------------------

Message: 3
Date: Thu, 7 Nov 2013 00:59:37 -0500
From: "Russ White" <russw@riw.= us>
To: "'Kireeti Kompella'" <kireeti.kompella@gmail.com>, =A0"'Robert<= br> =A0 =A0 =A0 =A0 Raszuk'" <= rraszuk@gmail.com>
Cc: sdn@irtf.org
Subject: Re: [Sdn] Thoughts on Defining control and Management Planes
Message-ID: <001a01cedb7e$8c043010$a40c9030$@riw.us>
Content-Type: text/plain; =A0 =A0 =A0 charset=3D"us-ascii"


> The difficulty for some folks (like me) is to drag our heads out of distributing
> everything on principle, and understand when centralization is a must.=

Of course --but that doesn't really help us determine a solid model to<= br> use... The point here is to find a model that can be used to accurately
describe interactions and protocols at the device level, so we can sort and=
classify the APIs and protocols needed at this level, then figure out how those protocols and APIs relate to services and the network as a whole.

I agree there is a need for higher level models to show how services
interact, and how the network works as a whole, but we can't simply ign= ore
that there are physical devices someplace connected to tangible wires that<= br> must switch real packets between two specific destinations in the network.<= br> If we can't describe what the pieces of that device are and how things<= br> outside that device interact with it, then all the services and network
models in the world aren't going to get us from an architecture to actu= ally
making packets flow from point a to point b. One of the problems with the SDN space is we always start with the ocean and a thousand uncoordinated matches. Let's try with a single small cup and a large stove instead.
So the services and network models are beautiful. I love drawing them on th= e
board, and theorizing a ton of them out. But what about the device? To
repeat:

- Data: Information used to actually forward packets.
- Control: protocols and processes used to build the information needed by<= br> the data plane.
- Management: protocols, configuration, and processes that manage the devic= e
on which the control and data plane processes run, and configure/manage the=
control plane processes themselves.

Seems pretty simple to me --it's not about speed (which can change), an= d
it's not about remote/local, etc. I don't think it's perfect, b= ut again, if
we allow platypuses to define our model, we'll have a hard time with du= cks
and beavers.

:-)

Russ




------------------------------

Message: 4
Date: Thu, 7 Nov 2013 07:09:41 +0100
From: Robert Raszuk <robert@raszuk.= net>
To: Russ White <russw@riw.us>
Cc: Kireeti Kompella <kire= eti.kompella@gmail.com>, SDN IRTF list
=A0 =A0 =A0 =A0 <sdn@irtf.org> Subject: Re: [Sdn] Thoughts on Defining control and Management Planes
Message-ID:
=A0 =A0 =A0 =A0 <CA+b+ERkZv_z75Wr5tPfzhYt+WserFT-PoHM= e_GXnw0t54S+cGA@mail.gmail.com>
Content-Type: text/plain; charset=3DISO-8859-1

Russ,

Brilliant ! So what *SDN* "real physical device" do you have in m= ind ?

URL would be great as well as pointer to its specification !

Maybe indeed we need to start from that, but I am afraid the
discussion is going to be rather short ;-)

Cheers,
R.

On Thu, Nov 7, 2013 at 6:59 AM, Russ White <russw@riw.us> wrote:
>
>> The difficulty for some folks (like me) is to drag our heads out o= f
> distributing
>> everything on principle, and understand when centralization is a m= ust.
>
> Of course --but that doesn't really help us determine a solid mode= l to
> use... The point here is to find a model that can be used to accuratel= y
> describe interactions and protocols at the device level, so we can sor= t and
> classify the APIs and protocols needed at this level, then figure out = how
> those protocols and APIs relate to services and the network as a whole= .
>
> I agree there is a need for higher level models to show how services > interact, and how the network works as a whole, but we can't simpl= y ignore
> that there are physical devices someplace connected to tangible wires = that
> must switch real packets between two specific destinations in the netw= ork.
> If we can't describe what the pieces of that device are and how th= ings
> outside that device interact with it, then all the services and networ= k
> models in the world aren't going to get us from an architecture to= actually
> making packets flow from point a to point b. One of the problems with = the
> SDN space is we always start with the ocean and a thousand uncoordinat= ed
> matches. Let's try with a single small cup and a large stove inste= ad.
>
> So the services and network models are beautiful. I love drawing them = on the
> board, and theorizing a ton of them out. But what about the device? To=
> repeat:
>
> - Data: Information used to actually forward packets.
> - Control: protocols and processes used to build the information neede= d by
> the data plane.
> - Management: protocols, configuration, and processes that manage the = device
> on which the control and data plane processes run, and configure/manag= e the
> control plane processes themselves.
>
> Seems pretty simple to me --it's not about speed (which can change= ), and
> it's not about remote/local, etc. I don't think it's perfe= ct, but again, if
> we allow platypuses to define our model, we'll have a hard time wi= th ducks
> and beavers.
>
> :-)
>
> Russ
>
>


------------------------------

Message: 5
Date: Thu, 7 Nov 2013 01:27:18 -0500
From: "Russ White" <russw@riw.= us>
To: "'Robert Raszuk'" <robert@raszuk.net>
Cc: 'Kireeti Kompella' <kireeti.kompella@gmail.com>, =A0 =A0'SDN IRTF list' =A0 =A0 =A0 =A0 <sdn@irtf.org> Subject: Re: [Sdn] Thoughts on Defining control and Management Planes
Message-ID: <000001cedb82$6c7f3330$457d9990$@riw.us>
Content-Type: text/plain; =A0 =A0 =A0 charset=3D"us-ascii"


> Brilliant ! So what *SDN* "real physical device" do you have= in mind ?

Do you need an actual unicorn to describe what a unicorn should look like?<= br> :-) Being a research group, it's okay to attempt to describe things tha= t
might not exist in the real world (I hope). It might even be a useful
exercise (if it can give us a channel for energy, so we don't keep buil= ding
horses with horns all over the place in an attempt to finally get to a
unicorn...) I'm hoping it's worth a try, at any rate.

:-)

Russ

P.S. OTOH, I could ask for some pointers to an operational "services b= ased
network," that doesn't have any hardware to switch actual packets.= :-)




------------------------------

Message: 6
Date: Thu, 7 Nov 2013 07:43:14 +0100
From: Robert Raszuk <robert@raszuk.= net>
To: Russ White <russw@riw.us>
Cc: Kireeti Kompella <kire= eti.kompella@gmail.com>, SDN IRTF list
=A0 =A0 =A0 =A0 <sdn@irtf.org> Subject: Re: [Sdn] Thoughts on Defining control and Management Planes
Message-ID:
=A0 =A0 =A0 =A0 <CA+b+ERmHHWuXscdazrSXS3ejKuFTe1GsmhMaPc9= bT4YMzDenKw@mail.gmail.com>
Content-Type: text/plain; charset=3DISO-8859-1

Is purpose of this IRTF group to describe new imaginary model of
non-existent physical device used for undefined set of services ?

Don't we have enough of those "research" already elsewhere ?<= br>
> P.S. OTOH, I could ask for some pointers to an operational "servi= ces
> based network," that doesn't have any hardware to switch actu= al
> packets. :-)

That's simple .. all *overlay* services work equally well over any
transport .. physical or virtual. But this was not the point.

The point was to suggest focusing on SDN as service driven research to
be able to map it later to any forwarding transport paradigm. That
IMHO could be the most useful approach for applied research as opposed
to spending time on theoretical/imaginary neverending discussions.


------------------------------

Message: 7
Date: Thu, 7 Nov 2013 09:27:10 +0100
From: Pedro Martinez-Julia <pedromj@um.= es>
To: sdn@irtf.org
Subject: Re: [Sdn] Thoughts on Defining control and Management Planes
Message-ID: <201311070827= 10.GQ3809@um.es>
Content-Type: text/plain; charset=3Dutf-8

On Thu, Nov 07, 2013 at 03:42:01AM +0000, Yaakov Stein wrote:
> What SDN has done is not so much separating the user plane from the co= ntrol plane -
> that was well known (and as aforementioned this misses the management = plane).
> What SDN does is remove the control plane and rename the centralized m= anagement plane to be "control" instead.
> It does so at the expense of emphasizing consistency, but losing the a= bility to simultaneously guarantee availability and partition tolerance. >

Really? I don't think so. Maybe I am misunderstanding the SDN concept but, from my point of view, SDN provides enormous flexibility to the
scene, so different networks can have different levels of control and
management functions, either centralized or decentralized. With SDN you
can still decide to keep the control model tightly coupled with the
forwarding model, i.e. having a controller per switch/router, or you can decide the opposite, have just one centralized controller in charge of
the control and to which you interact to achieve management. It is up to the network architect to determine the requirements of the network and
translate them to a specific model. SDN enables you to do it.

>
> Y(J)S
>

Regards,
Pedro

--
Pedro Martinez-Julia
Department of Communication and Information Engineering
Faculty of Computer Science
University of Murcia
Email: pedromj@um.es
---------------------------------------------------------
*** Entia non sunt multiplicanda praeter necessitatem ***


------------------------------

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sdn mailing list
sdn@irtf.org
htt= ps://www.irtf.org/mailman/listinfo/sdn


End of sdn Digest, Vol 19, Issue 8
**********************************

--001a113450c238b8b604ea97012b-- From pedromj@um.es Thu Nov 7 08:11:24 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 110F421E813B for ; Thu, 7 Nov 2013 08:11:22 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -6.099 X-Spam-Level: X-Spam-Status: No, score=-6.099 tagged_above=-999 required=5 tests=[AWL=0.500, BAYES_00=-2.599, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id l1m0lowaRhk9 for ; Thu, 7 Nov 2013 08:11:13 -0800 (PST) Received: from xenon11.um.es (xenon11.um.es [155.54.212.165]) by ietfa.amsl.com (Postfix) with ESMTP id E095221E8116 for ; Thu, 7 Nov 2013 08:11:05 -0800 (PST) Received: from localhost (localhost [127.0.0.1]) by xenon11.um.es (Postfix) with ESMTP id C0D9E53D1C for ; Thu, 7 Nov 2013 17:10:58 +0100 (CET) X-Virus-Scanned: by antispam in UMU at xenon11.um.es Received: from xenon11.um.es ([127.0.0.1]) by localhost (xenon11.um.es [127.0.0.1]) (amavisd-new, port 10024) with LMTP id ejrrzMOcWvaA for ; Thu, 7 Nov 2013 17:10:58 +0100 (CET) Received: from localhost (1.Red-88-25-205.staticIP.rima-tde.net [88.25.205.1]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) (Authenticated sender: pedromj@um.es) by xenon11.um.es (Postfix) with ESMTPSA id 78B5C53D45 for ; Thu, 7 Nov 2013 17:10:52 +0100 (CET) Date: Thu, 7 Nov 2013 17:10:51 +0100 From: Pedro Martinez-Julia To: sdn@irtf.org Message-ID: <20131107161051.GA9494@um.es> References: <20131106192326.GO3809@um.es> <01d701cedb37$b68421c0$238c6540$@riw.us> <20131106214234.GP3809@um.es> <5B1B2570-660C-4088-88D7-07C78B193B02@gmail.com> <99D0BF21-FECB-44CC-8567-8F3B2BF5AA32@gmail.com> <001a01cedb7e$8c043010$a40c9030$@riw.us> <20131107093852.GR3809@um.es> <019b01cedbc0$1bf507d0$53df1770$@riw.us> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <019b01cedbc0$1bf507d0$53df1770$@riw.us> User-Agent: Mutt/1.5.22 (2013-10-16) Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 07 Nov 2013 16:11:24 -0000 On Thu, Nov 07, 2013 at 08:48:57AM -0500, Russ White wrote: > > IMHO, one way forward is to impose a model for an individual device so we at > least start with that one thing in common, and then let's see where we can > go from there. I'm not positing that we limit ourselves to a single device > model, only that we start there, because I think we can actually get to a > single device model everyone can agree on if we think about it hard enough. > Once we get that piece in place, we have common ground to start talking > about network and service models in relation to the single device model we > all share. > I agree with this. We have to specify the basement to define such device model. I propose to begin here with a draft definition of the functions that should be supported by a single device and the interfaces it offers to other devices or elements. According to this I like the "keep it simple" principle so I would start with a simple device model: - N ports for incoming/outgoing packets. - A forwarding table with rules used to determine the outgoing port for the packets that match them. - A packet analyzer that matches incoming packets (from incoming ports) with the rules of the forwarding table. - At least two queues (incoming/outgoing) for each port. - A status control unit that verifies each hardware component to know its working status and other performance values. This includes: + A link status monitor that verifies that a link works and that the device/element connected to the other side is working correctly. + A queue checker that verifies that a queue is not dropping packets constantly. - A configuration unit that stores the different options supported by the device and sets them to the units that correspond to them. - A control interface that can be used by other elements to query and/or update the entries of the forwarding table. - A management interface that can be used by other elements to get the status collected by the status control unit and to configure different variables of the device. This model is a very initial draft so it is incomplete (and superfluous) but, please, let me know your thoughts or opinions. Thank you. > :-) > > Russ > Regards, Pedro -- Pedro Martinez-Julia Department of Communication and Information Engineering Faculty of Computer Science University of Murcia Email: pedromj@um.es --------------------------------------------------------- *** Entia non sunt multiplicanda praeter necessitatem *** From russw@riw.us Thu Nov 7 08:35:36 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5AF2A21F9CF7 for ; Thu, 7 Nov 2013 08:35:36 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.405 X-Spam-Level: X-Spam-Status: No, score=-2.405 tagged_above=-999 required=5 tests=[AWL=0.194, BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id CLEG+q2JYC69 for ; Thu, 7 Nov 2013 08:35:30 -0800 (PST) Received: from server.riw.us (server.riw.us [162.144.32.236]) by ietfa.amsl.com (Postfix) with ESMTP id 2431C21F9CC2 for ; Thu, 7 Nov 2013 08:35:28 -0800 (PST) Received: from [64.114.24.114] (port=49195 helo=RussPC) by server.riw.us with esmtpsa (TLSv1:AES128-SHA:128) (Exim 4.80.1) (envelope-from ) id 1VeSYF-0007j9-6f; Thu, 07 Nov 2013 16:35:23 +0000 From: "Russ White" To: "'Pedro Martinez-Julia'" , References: <20131106192326.GO3809@um.es> <01d701cedb37$b68421c0$238c6540$@riw.us> <20131106214234.GP3809@um.es> <5B1B2570-660C-4088-88D7-07C78B193B02@gmail.com> <99D0BF21-FECB-44CC-8567-8F3B2BF5AA32@gmail.com> <001a01cedb7e$8c043010$a40c9030$@riw.us> <20131107093852.GR3809@um.es> <019b01cedbc0$1bf507d0$53df1770$@riw.us> <20131107161051.GA9494@um.es> In-Reply-To: <20131107161051.GA9494@um.es> Date: Thu, 7 Nov 2013 11:35:27 -0500 Message-ID: <004901cedbd7$5f3b81b0$1db28510$@riw.us> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Outlook 15.0 Thread-Index: AQHVdZjQqqdt0WvyXgFgPlMwrYB5nAMFmjmlAiqfHQQCL8e8UQEnnBpYAhy0Qa8B1cVbFwH9vdGKAfWMpyoBNtJNUwNdGw8wmWS4N3A= Content-Language: en-us X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server.riw.us X-AntiAbuse: Original Domain - irtf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - riw.us X-Get-Message-Sender-Via: server.riw.us: authenticated_id: russw@riw.us X-Source: X-Source-Args: X-Source-Dir: Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 07 Nov 2013 16:35:36 -0000 > - N ports for incoming/outgoing packets. > - A forwarding table with rules used to determine the outgoing port for > the packets that match them. > - A packet analyzer that matches incoming packets (from incoming ports) > with the rules of the forwarding table. > - At least two queues (incoming/outgoing) for each port. These would all fit as components under the data plane in the model I proposed previously. > - A status control unit that verifies each hardware component to know > its working status and other performance values. This includes: > + A link status monitor that verifies that a link works and that the > device/element connected to the other side is working correctly. > + A queue checker that verifies that a queue is not dropping packets > constantly. > - A configuration unit that stores the different options supported by > the device and sets them to the units that correspond to them. > - A control interface that can be used by other elements to query and/or > update the entries of the forwarding table. > - A management interface that can be used by other elements to get the > status collected by the status control unit and to configure different > variables of the device. These would all fit under the management plane in the model I previously proposed. There would be a third component, the control plane, which is the intermediary between protocols and processes that maintain a view of the network state and the actual data plane databases. On the whole, I'd like to work from the middle --we can work down to components, and up to network, but we need three or four broad categories which will serve to describe all the "stuff" that goes on in a single device. These things need to be abstract enough to be useful from above, and yet specific enough to be useful from below. :-) Russ From dmm@1-4-5.net Thu Nov 7 08:38:46 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D37CC21E81B2 for ; Thu, 7 Nov 2013 08:38:45 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.977 X-Spam-Level: X-Spam-Status: No, score=-2.977 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 4s9YQ8JDuPdu for ; Thu, 7 Nov 2013 08:38:41 -0800 (PST) Received: from mail-oa0-f53.google.com (mail-oa0-f53.google.com [209.85.219.53]) by ietfa.amsl.com (Postfix) with ESMTP id 34D1E21F9CF7 for ; Thu, 7 Nov 2013 08:38:00 -0800 (PST) Received: by mail-oa0-f53.google.com with SMTP id j17so1193985oag.40 for ; Thu, 07 Nov 2013 08:37:44 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type :content-transfer-encoding; bh=wABLwh1bhwAvxsrg2ePEGw2FHbLChrFSRSIY4Dkhmfo=; b=iUh7TqO065hwnuof8hEV/I4Z8vwDuCaM8ZUpLY/1L4+OfwgozPyOliJDkwebZMdiy9 3f7wjeoMwlOvm2HqWfRtKRb45Uz/9L3Sq+7DBdn18/EFp6l+vHN2rkiQPN0Z5EFDwhEe 2IqM+NuJSTvTvWdby7RBKpJvPcIMVaJxzTlYSicqYUwxbtGMkCG03Rxplt76lTaU5z3y d+MDQU7QAAV4AU6VKPHjPHRqJXqZc1whZ8KiuHUnfDP6O/T++sSIVJQGlgK+AJVp1sZd NFagN9TKUxwiet/XsyZ5Jgq/LQwc9r8KM4fb2L2p10zt3w4f0+NbwZuhKBdG8sDAkjVV HwMg== X-Gm-Message-State: ALoCoQlUBTjZw+PfSiUEaBu5sC4ui0HFUjB5q1B4RHYtq9lDshCakLB5XRKiI0j6Q6UiQKrHtMEB MIME-Version: 1.0 X-Received: by 10.182.213.97 with SMTP id nr1mr655886obc.48.1383842264613; Thu, 07 Nov 2013 08:37:44 -0800 (PST) Received: by 10.182.66.168 with HTTP; Thu, 7 Nov 2013 08:37:44 -0800 (PST) X-Originating-IP: [144.49.132.3] In-Reply-To: References: Date: Thu, 7 Nov 2013 08:37:44 -0800 Message-ID: From: David Meyer To: Yaakov Stein Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Cc: Russ White , "sdn@irtf.org" Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 07 Nov 2013 16:38:46 -0000 Yaakov, On Wed, Nov 6, 2013 at 7:42 PM, Yaakov Stein wrote: > I would like to explain my comment at the meeting on the difference betwe= en the two planes, > and add something about why the difference between the two is important. First, thank you for your thoughtful analysis. > > In the olden days, three planes were defined - the data or user (or forwa= rding) plane, > the control plane, and the management plane. > The difference between the latter two was less functional than operationa= l. > > The control plane was fast and distributed and local. > The management plane was anything that required, or at least enabled, hum= an intervention. > As an example, OAM messages are user plane (since they fate share with us= er data), but may trigger control protocol operations such as protection sw= itching, > or may trigger alarms (management plane) or be used to collect statistics= that can be retrieved via the management plane. > > Over time more and more "intelligent" operations that were once performed= by humans > were replaced by software. However, two fundamental differences remained. > First - since control plane operations are automatic they remain faster t= han management plane operations. > Second - since humans were localized in NOCs the management intelligence = remains centralized, > while control protocols are distributed. Agreed, this is history. But as I mentioned this paradigm (almost explicitly) no longer really applies (especially in the age of what I would call "deep automation"; see e.g. [0]; but then I think we all know this). > > Why did these two planes not fuse ? > Because there are operations that are better carried out locally, > and there are others that are better managed from a central management si= te. > > The reason has to do with the CAP theorem. > I don't have the room to fully explain this here, > but the CAP theorem dictates that at most two of consistency, availabilit= y, and partition tolerance can be achieved simultaneously. I highly advise [1] for folks seeking to get some intuition about what the CAP theorem is all about. > Here the calculation to be carried out is how to forward packets from ing= ress to egress. > In general, service providers are required to guarantee availability (e.g= ., five nines) > and partition tolerance (e.g., 50 msec) for operational services, > and they forgo consistency (which is why we need OAM and TTL fields). > This can be carried out by distributed local control planes, but not by c= entralized management systems. Proponents of centralized approaches might disagree. Personally it seems almost trivial to see that a lower bound would be something like LB(convergence) =3D RTT(controller, switch) + PPT(controller) + PPT(switch) where RTT is the round trip time, and PPT is the packet processing time (note in the case of something like OF you might have sum this over the entire path). > However, there are tasks that require consistency and can give up availab= ility, > such as new service creation; these require a centralized management syst= em > (which is why service activation is slow - it is not immediately availabl= e). I would s/require/can make use of/g (require is a strong term that needs something to substantiate it). > Network operations involves disciplined decision behind the use of one or= the other plane > for various tasks. > > What SDN has done is not so much separating the user plane from the contr= ol plane - > that was well known (and as aforementioned this misses the management pla= ne). Yes, nothing new under the sun. However, separation of control and data planes was a key component of what was perhaps early thinking about the attributes of what was then called SDN. See e.g., [2] (or any number of other references). Now, if you are arguing that those definitions were either wrong is fair game, however, that doesn't change the fact that control/data plane separation was a key part of early definitions of SDN. > What SDN does is remove the control plane and rename the centralized mana= gement plane to be "control" instead. > It does so at the expense of emphasizing consistency, but losing the abil= ity to simultaneously guarantee availability and partition tolerance. That is also not clear. I can make the "centralized management plane" a distributed system as well, at which point the CAP theorem is in play. Thx, --dmm [0] http://www.theregister.co.uk/2013/11/04/google_living_omega_cloud/ [1] http://www.infoq.com/articles/cap-twelve-years-later-how-the-rules-have= -changed [2] https://www.opennetworking.org/sdn-resources/sdn-definition > > > Y(J)S > > > -----Original Message----- > From: sdn-bounces@irtf.org [mailto:sdn-bounces@irtf.org] On Behalf Of Rus= s White > Sent: 06 November, 2013 19:59 > To: sdn@irtf.org > Subject: [Sdn] Thoughts on Defining control and Management Planes > > Y'all: > > In the SDN meeting, there was some discussion over the management and con= trol planes. I think defining these two is important in having consistent l= anguage (hermeneutics being a hobby of mine, among many others). To wit, a = possible set of definitions for consideration and discussion. Not claiming = these are perfect, but I do think we need to get past "this is faster than = that," and other permeable boundaries. > > - control plane: Those processes / configuration which directly impacts t= he information used to forward (or switch) traffic through a device. This w= ould include distributed protocols, static configuration, etc. > > - management plane: Those processes or configuration that modify the oper= ation of the control plane, or the general operation of the device on which= the control plane processes run. > > - data plane: The information and processes actually used to forward or p= rocess packets. > > So, for example: > > - OSPF is a control plane protocol > - Configuring which interfaces OSPF runs on is a management function, sin= ce it impacts the operation of a control plane protocol > - FORCES is a control plane protocol ( in the main) > > A single SDN system might interact with all three, of course (though I te= nd to believe these are different enough areas to warrant different solutio= ns). > > I know there are probably hard cases that won't cleanly fit here, but we = shouldn't let platypuses disturb our ability to differentiate between a duc= k and a beaver... Thoughts and discussion welcome, just would like to get t= his nailed down so we can actually have a common language to work from. > > :-) > > Russ > > > > <>< > russw@riw.us > Ericsson > _______________________________________________ > sdn mailing list > sdn@irtf.org > https://www.irtf.org/mailman/listinfo/sdn > _______________________________________________ > sdn mailing list > sdn@irtf.org > https://www.irtf.org/mailman/listinfo/sdn From dmm@1-4-5.net Thu Nov 7 08:44:57 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5EC2711E80DC for ; Thu, 7 Nov 2013 08:44:57 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.977 X-Spam-Level: X-Spam-Status: No, score=-2.977 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id f57DZCAQXhjE for ; Thu, 7 Nov 2013 08:44:52 -0800 (PST) Received: from mail-oa0-f43.google.com (mail-oa0-f43.google.com [209.85.219.43]) by ietfa.amsl.com (Postfix) with ESMTP id 0F53B11E8260 for ; Thu, 7 Nov 2013 08:44:21 -0800 (PST) Received: by mail-oa0-f43.google.com with SMTP id m1so1186309oag.2 for ; Thu, 07 Nov 2013 08:44:13 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type :content-transfer-encoding; bh=FGUGOuVUM0ERmq9Fv9f5vL4/JM3pFRgtSC8jfDMC0qA=; b=ZzCHDKxOAOxu56bpQy1+yKfKUeKC1e4WfMb+po0Ibw0LVq5pdKBa37943Fqp4huyt9 VY0eLiJ56BhifZEKZB0YfLJ17Qh5kRQDfmqL1Gb8OUhwmFV4q3oOnxx4PTEW0K/TD03o u6lAA+k/3MxBNPSHKpdH0if8iX3jsGXqx+t3YaLYWTEwHmTGRWd4R5JNz68KrSROOCV+ ux6A3gQG2tidHBQqrTlW/OVDeM5ow0ajhkrPUtWS076pTNT1vvcIM5V68HSdKTiBYAcs 0/6x/aKGGRiWYtoWiRj+EK9AGraWBA8ttjrt23VXpWRGB/7Tuy4FVDMLL1k86/aFe7c2 icUw== X-Gm-Message-State: ALoCoQlqRBq3d910kwiZKQmovQaLLXYhvdjgyvsfWjHLhQyMZnW696erBDz8pw7j7xNXXbcxcC0k MIME-Version: 1.0 X-Received: by 10.60.33.74 with SMTP id p10mr7348601oei.18.1383842653632; Thu, 07 Nov 2013 08:44:13 -0800 (PST) Received: by 10.182.66.168 with HTTP; Thu, 7 Nov 2013 08:44:13 -0800 (PST) X-Originating-IP: [144.49.132.3] In-Reply-To: References: Date: Thu, 7 Nov 2013 08:44:13 -0800 Message-ID: From: David Meyer To: Yaakov Stein Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Cc: Russ White , "sdn@irtf.org" Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 07 Nov 2013 16:44:57 -0000 On Thu, Nov 7, 2013 at 8:37 AM, David Meyer wrote: > Yaakov, > > On Wed, Nov 6, 2013 at 7:42 PM, Yaakov Stein wrote: >> I would like to explain my comment at the meeting on the difference betw= een the two planes, >> and add something about why the difference between the two is important. > > First, thank you for your thoughtful analysis. > >> >> In the olden days, three planes were defined - the data or user (or forw= arding) plane, >> the control plane, and the management plane. >> The difference between the latter two was less functional than operation= al. >> >> The control plane was fast and distributed and local. >> The management plane was anything that required, or at least enabled, hu= man intervention. >> As an example, OAM messages are user plane (since they fate share with u= ser data), but may trigger control protocol operations such as protection s= witching, >> or may trigger alarms (management plane) or be used to collect statistic= s that can be retrieved via the management plane. >> >> Over time more and more "intelligent" operations that were once performe= d by humans >> were replaced by software. However, two fundamental differences remained= . >> First - since control plane operations are automatic they remain faster = than management plane operations. >> Second - since humans were localized in NOCs the management intelligence= remains centralized, >> while control protocols are distributed. > > Agreed, this is history. But as I mentioned this paradigm (almost > explicitly) no longer really applies (especially in the age of what I > would call "deep automation"; see e.g. [0]; but then I think we all > know this). > >> >> Why did these two planes not fuse ? >> Because there are operations that are better carried out locally, >> and there are others that are better managed from a central management s= ite. >> >> The reason has to do with the CAP theorem. >> I don't have the room to fully explain this here, >> but the CAP theorem dictates that at most two of consistency, availabili= ty, and partition tolerance can be achieved simultaneously. > > I highly advise [1] for folks seeking to get some intuition about what > the CAP theorem is all about. > >> Here the calculation to be carried out is how to forward packets from in= gress to egress. >> In general, service providers are required to guarantee availability (e.= g., five nines) >> and partition tolerance (e.g., 50 msec) for operational services, >> and they forgo consistency (which is why we need OAM and TTL fields). >> This can be carried out by distributed local control planes, but not by = centralized management systems. > > Proponents of centralized approaches might disagree. Personally it > seems almost trivial to see that a lower bound would be something like > > LB(convergence) =3D RTT(controller, switch) + PPT(controller) + PPT(switc= h) > > where > > RTT is the round trip time, and PPT is the packet processing time > (note in the case of something like OF you might have sum this over > the entire path). > > >> However, there are tasks that require consistency and can give up availa= bility, >> such as new service creation; these require a centralized management sys= tem >> (which is why service activation is slow - it is not immediately availab= le). > > I would s/require/can make use of/g > > (require is a strong term that needs something to substantiate it). > >> Network operations involves disciplined decision behind the use of one o= r the other plane >> for various tasks. >> >> What SDN has done is not so much separating the user plane from the cont= rol plane - >> that was well known (and as aforementioned this misses the management pl= ane). > > Yes, nothing new under the sun. However, separation of control and > data planes was a key component of what was perhaps early thinking > about the attributes of what was then called SDN. See e.g., [2] (or > any number of other references). Now, if you are arguing that those > definitions were either wrong is fair game, however, that doesn't > change the fact that control/data plane separation was a key part of > early definitions of SDN. > >> What SDN does is remove the control plane and rename the centralized man= agement plane to be "control" instead. >> It does so at the expense of emphasizing consistency, but losing the abi= lity to simultaneously guarantee availability and partition tolerance. > > That is also not clear. I can make the "centralized management plane" > a distributed system as well, at which point the CAP theorem is in > play. I see that I kinda misread your statement. My point is that since the "centralized management plane" can be a distributed system (I would ague "has to be" for reasons of scale and resilience), then CAP tradeoffs are in play. We might have designed for the tradeoff that you mention, but that is not "architecturally" required. --dmm > > Thx, > > --dmm > > > [0] http://www.theregister.co.uk/2013/11/04/google_living_omega_cloud/ > [1] http://www.infoq.com/articles/cap-twelve-years-later-how-the-rules-ha= ve-changed > [2] https://www.opennetworking.org/sdn-resources/sdn-definition > >> >> >> Y(J)S >> >> >> -----Original Message----- >> From: sdn-bounces@irtf.org [mailto:sdn-bounces@irtf.org] On Behalf Of Ru= ss White >> Sent: 06 November, 2013 19:59 >> To: sdn@irtf.org >> Subject: [Sdn] Thoughts on Defining control and Management Planes >> >> Y'all: >> >> In the SDN meeting, there was some discussion over the management and co= ntrol planes. I think defining these two is important in having consistent = language (hermeneutics being a hobby of mine, among many others). To wit, a= possible set of definitions for consideration and discussion. Not claiming= these are perfect, but I do think we need to get past "this is faster than= that," and other permeable boundaries. >> >> - control plane: Those processes / configuration which directly impacts = the information used to forward (or switch) traffic through a device. This = would include distributed protocols, static configuration, etc. >> >> - management plane: Those processes or configuration that modify the ope= ration of the control plane, or the general operation of the device on whic= h the control plane processes run. >> >> - data plane: The information and processes actually used to forward or = process packets. >> >> So, for example: >> >> - OSPF is a control plane protocol >> - Configuring which interfaces OSPF runs on is a management function, si= nce it impacts the operation of a control plane protocol >> - FORCES is a control plane protocol ( in the main) >> >> A single SDN system might interact with all three, of course (though I t= end to believe these are different enough areas to warrant different soluti= ons). >> >> I know there are probably hard cases that won't cleanly fit here, but we= shouldn't let platypuses disturb our ability to differentiate between a du= ck and a beaver... Thoughts and discussion welcome, just would like to get = this nailed down so we can actually have a common language to work from. >> >> :-) >> >> Russ >> >> >> >> <>< >> russw@riw.us >> Ericsson >> _______________________________________________ >> sdn mailing list >> sdn@irtf.org >> https://www.irtf.org/mailman/listinfo/sdn >> _______________________________________________ >> sdn mailing list >> sdn@irtf.org >> https://www.irtf.org/mailman/listinfo/sdn From dmm@1-4-5.net Thu Nov 7 08:53:10 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0D65611E80EC for ; Thu, 7 Nov 2013 08:53:10 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.977 X-Spam-Level: X-Spam-Status: No, score=-2.977 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 1K00fvYelKta for ; Thu, 7 Nov 2013 08:52:42 -0800 (PST) Received: from mail-ob0-f169.google.com (mail-ob0-f169.google.com [209.85.214.169]) by ietfa.amsl.com (Postfix) with ESMTP id DB41021E81C6 for ; Thu, 7 Nov 2013 08:50:58 -0800 (PST) Received: by mail-ob0-f169.google.com with SMTP id uz6so311554obc.28 for ; Thu, 07 Nov 2013 08:50:53 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type; bh=FOvctjbO/7LWVfF5rcuRRTtk+4T8I3HDPR+zi7eTU/Q=; b=Z8q0jNQEe3+lPfBPjvouNVZIOXrIh4yX4AB06FFjfcMFK/3fVnK46l5roCbrgTmqPR QQzFK2e5lshksTiJ+aJ2kZ0P3QvoDTfkT/RUOdLkC8dz35LkPN5IJYFJZeXkhGb+Ovc6 DBH8CHlY0wsCPJpBL85a3gwlCKKGFTbo1Xe0bEw24hhsj2Iou271m/6sLYtZafnLAXTT dAXq2BWkLhBLPM/ISzxJY1LQGRKz8jl+c/fjJF5EU1zJqi+jWCC/wFWsoT9Agnhz9nPN HmO/ei1AwTmmYVjsuq2DMENWlV7YdWrLR6fVl663JD4nizvsW+EF37mvw2qX0MlG91gL JKhA== X-Gm-Message-State: ALoCoQkXRX1jFCV97mGsZduCH/D/TyoYs9EITi3+ztVwGYpzIoGFBg8znqDfUwUC1vzDalS30NG3 MIME-Version: 1.0 X-Received: by 10.182.144.136 with SMTP id sm8mr683042obb.63.1383843053872; Thu, 07 Nov 2013 08:50:53 -0800 (PST) Received: by 10.182.66.168 with HTTP; Thu, 7 Nov 2013 08:50:53 -0800 (PST) X-Originating-IP: [144.49.132.3] In-Reply-To: <20131107082710.GQ3809@um.es> References: <20131107082710.GQ3809@um.es> Date: Thu, 7 Nov 2013 08:50:53 -0800 Message-ID: From: David Meyer To: Pedro Martinez-Julia Content-Type: text/plain; charset=ISO-8859-1 Cc: SDN IRTF list Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 07 Nov 2013 16:53:10 -0000 On Thu, Nov 7, 2013 at 12:27 AM, Pedro Martinez-Julia wrote: > On Thu, Nov 07, 2013 at 03:42:01AM +0000, Yaakov Stein wrote: >> What SDN has done is not so much separating the user plane from the control plane - >> that was well known (and as aforementioned this misses the management plane). >> What SDN does is remove the control plane and rename the centralized management plane to be "control" instead. >> It does so at the expense of emphasizing consistency, but losing the ability to simultaneously guarantee availability and partition tolerance. >> > > Really? I don't think so. Maybe I am misunderstanding the SDN concept > but, from my point of view, SDN provides enormous flexibility to the > scene, so different networks can have different levels of control and > management functions, either centralized or decentralized. With SDN you > can still decide to keep the control model tightly coupled with the > forwarding model, i.e. having a controller per switch/router, or you can > decide the opposite, have just one centralized controller in charge of > the control and to which you interact to achieve management. It is up to > the network architect to determine the requirements of the network and > translate them to a specific model. SDN enables you to do it. I agree with you but the decomposition you mention doesn't seem to be clean, namely, loose/tight coupling vs. number of control planes. In particular, I can have one controller/switch but still have them be loosely coupled. --dmm > >> >> Y(J)S >> > > Regards, > Pedro > > -- > Pedro Martinez-Julia > Department of Communication and Information Engineering > Faculty of Computer Science > University of Murcia > Email: pedromj@um.es > --------------------------------------------------------- > *** Entia non sunt multiplicanda praeter necessitatem *** > _______________________________________________ > sdn mailing list > sdn@irtf.org > https://www.irtf.org/mailman/listinfo/sdn From dgurkan@Central.UH.EDU Thu Nov 7 09:45:22 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 37A0721E8127 for ; Thu, 7 Nov 2013 09:45:22 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -6.433 X-Spam-Level: X-Spam-Status: No, score=-6.433 tagged_above=-999 required=5 tests=[AWL=0.166, BAYES_00=-2.599, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id eC9vGNhS5ZNJ for ; Thu, 7 Nov 2013 09:45:17 -0800 (PST) Received: from sophos3.cc.uh.edu (sophos3.cc.uh.edu [129.7.234.89]) by ietfa.amsl.com (Postfix) with ESMTP id 5996B21E813F for ; Thu, 7 Nov 2013 09:45:17 -0800 (PST) Received: from sophos3.cc.uh.edu (localhost.localdomain [127.0.0.1]) by localhost (Postfix) with SMTP id 442761BB60C; Thu, 7 Nov 2013 11:33:40 -0600 (CST) Received: from ExFenode3B.cougarnet.uh.edu (unknown [129.7.40.160]) by sophos3.cc.uh.edu (Postfix) with ESMTP id 3E4C41BB366; Thu, 7 Nov 2013 11:33:40 -0600 (CST) Received: from ExServer2.cougarnet.uh.edu ([fe80::5495:e6f7:bdb5:1651]) by ExFenode3B.cougarnet.uh.edu ([fe80::6489:875b:ea52:7670%14]) with mapi; Thu, 7 Nov 2013 11:45:16 -0600 From: "Gurkan, Deniz" To: Russ White , "sdn@irtf.org" Date: Thu, 7 Nov 2013 11:45:15 -0600 Thread-Topic: [Sdn] Thoughts on Defining control and Management Planes Thread-Index: Ac7bGqIJORFgEYwARK2Ihw/22tFCPgABO+Lg Message-ID: References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 07 Nov 2013 17:45:22 -0000 We published a limited experience with management plane within OpenFlow-cap= able device-based network on GENI (http://www.geni.net) based on OFConfig (= NetConf on transport). Narisetty, RajaRevanth, Levent Dane, Anatoliy Malishevskiy, Deniz Gurkan, S= tuart Bailey, Sandhya Narayan, and Shivaram Mysore. "OpenFlow Configuration= Protocol: Implementation for the of Management Plane." In Research and Edu= cational Experiment Workshop (GREE), 2013 Second GENI, pp. 66-67. IEEE, 201= 3. I am trying to understand whether the definition of management plane also i= ncludes a view of resources on devices. After all, if one does not know wha= t devices are in one's network, how do we manage them? This might be in "di= scovery" operation for topology but manageability is not limited to topolog= y only. I am talking about configurable parameters on devices that only a m= anagement plane would be dealing with such as queues, TCAM spaces (and/or f= low spaces), etc. Deniz -----Original Message----- From: sdn-bounces@irtf.org [mailto:sdn-bounces@irtf.org] On Behalf Of Russ = White Sent: Wednesday, November 06, 2013 11:59 AM To: sdn@irtf.org Subject: [Sdn] Thoughts on Defining control and Management Planes Y'all: In the SDN meeting, there was some discussion over the management and contr= ol planes. I think defining these two is important in having consistent lan= guage (hermeneutics being a hobby of mine, among many others). To wit, a po= ssible set of definitions for consideration and discussion. Not claiming th= ese are perfect, but I do think we need to get past "this is faster than th= at," and other permeable boundaries. - control plane: Those processes / configuration which directly impacts the= information used to forward (or switch) traffic through a device. This wou= ld include distributed protocols, static configuration, etc. - management plane: Those processes or configuration that modify the operat= ion of the control plane, or the general operation of the device on which t= he control plane processes run. - data plane: The information and processes actually used to forward or pro= cess packets. So, for example: - OSPF is a control plane protocol - Configuring which interfaces OSPF runs on is a management function, since= it impacts the operation of a control plane protocol - FORCES is a control plane protocol ( in the main) A single SDN system might interact with all three, of course (though I tend= to believe these are different enough areas to warrant different solutions= ). I know there are probably hard cases that won't cleanly fit here, but we sh= ouldn't let platypuses disturb our ability to differentiate between a duck = and a beaver... Thoughts and discussion welcome, just would like to get thi= s nailed down so we can actually have a common language to work from. :-) Russ <>< russw@riw.us Ericsson _______________________________________________ sdn mailing list sdn@irtf.org https://www.irtf.org/mailman/listinfo/sdn From pedromj@um.es Thu Nov 7 11:24:38 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id ECA4711E8281 for ; Thu, 7 Nov 2013 11:24:38 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.67 X-Spam-Level: X-Spam-Status: No, score=-4.67 tagged_above=-999 required=5 tests=[AWL=-1.071, BAYES_00=-2.599, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id v9169U49ia+I for ; Thu, 7 Nov 2013 11:24:33 -0800 (PST) Received: from xenon13.um.es (xenon13.um.es [155.54.212.167]) by ietfa.amsl.com (Postfix) with ESMTP id EEF4911E81BD for ; Thu, 7 Nov 2013 11:24:32 -0800 (PST) Received: from localhost (localhost [127.0.0.1]) by xenon13.um.es (Postfix) with ESMTP id EB07C5D91C for ; Thu, 7 Nov 2013 20:24:31 +0100 (CET) X-Virus-Scanned: by antispam in UMU at xenon13.um.es Received: from xenon13.um.es ([127.0.0.1]) by localhost (xenon13.um.es [127.0.0.1]) (amavisd-new, port 10024) with LMTP id a7sXaUVLaqoS for ; Thu, 7 Nov 2013 20:24:31 +0100 (CET) Received: from localhost (1.Red-88-25-205.staticIP.rima-tde.net [88.25.205.1]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) (Authenticated sender: pedromj@um.es) by xenon13.um.es (Postfix) with ESMTPSA id 2F7665D72F for ; Thu, 7 Nov 2013 20:24:30 +0100 (CET) Date: Thu, 7 Nov 2013 20:24:29 +0100 From: Pedro Martinez-Julia To: sdn@irtf.org Message-ID: <20131107192429.GB9494@um.es> References: <20131107082710.GQ3809@um.es> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.22 (2013-10-16) Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 07 Nov 2013 19:24:39 -0000 On Thu, Nov 07, 2013 at 08:50:53AM -0800, David Meyer wrote: > > Really? I don't think so. Maybe I am misunderstanding the SDN concept > > but, from my point of view, SDN provides enormous flexibility to the > > scene, so different networks can have different levels of control and > > management functions, either centralized or decentralized. With SDN you > > can still decide to keep the control model tightly coupled with the > > forwarding model, i.e. having a controller per switch/router, or you can > > decide the opposite, have just one centralized controller in charge of > > the control and to which you interact to achieve management. It is up to > > the network architect to determine the requirements of the network and > > translate them to a specific model. SDN enables you to do it. > > I agree with you but the decomposition you mention doesn't seem to be > clean, namely, loose/tight coupling vs. number of control planes. In > particular, I can have one controller/switch but still have them be > loosely coupled. > Yes, you can. That is part of the flexibility I am talking about. I was mistakenly too much specific in the definition. > --dmm > Regards, Pedro -- Pedro Martinez-Julia Department of Communication and Information Engineering Faculty of Computer Science University of Murcia Email: pedromj@um.es --------------------------------------------------------- *** Entia non sunt multiplicanda praeter necessitatem *** From sbarkai@gmail.com Sun Nov 10 07:54:32 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 34F7211E810D for ; Sun, 10 Nov 2013 07:54:32 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.203 X-Spam-Level: X-Spam-Status: No, score=-1.203 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, MIME_QP_LONG_LINE=1.396] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 8b8dWR+Vvreg for ; Sun, 10 Nov 2013 07:54:31 -0800 (PST) Received: from mail-qc0-x22f.google.com (mail-qc0-x22f.google.com [IPv6:2607:f8b0:400d:c01::22f]) by ietfa.amsl.com (Postfix) with ESMTP id 5748F11E811B for ; Sun, 10 Nov 2013 07:54:31 -0800 (PST) Received: by mail-qc0-f175.google.com with SMTP id e16so3415253qcx.34 for ; Sun, 10 Nov 2013 07:54:31 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=references:in-reply-to:mime-version:content-transfer-encoding :content-type:message-id:cc:from:subject:date:to; bh=axHIC2gYQc9J5NBMMFD1geASh0Nyhd0rSpS3wRH8HIs=; b=Q8cfg5ZqKXRrtUtrgqrUvQOjWRhSefgXyxIpWsJX+IEPTLMHsfLB95VsBlrl+JYDox MQkaml9XAeAOID3nvcg42Zpiqlo1/Q/8MoyEn6LncE1Ia9/eP+zC+cW2VrWCPA4XjdRm r3qQQieX5Jboh+LnJoDI42WHJklxPZaVzJlyGsuIWxIlytVngIvAPyjnhcgOckqBGjt0 mPumYxXpjuc2A/ttvG6Aa7VSkZuvHgEYa5Hnj7Ml7jtB5LXbibor2j4lYKAujD253bAt emb8Gp2rzYx+NnqlkJdR9469eJrurhDFLTjgak7u42Dw+NSg32McDby5dgpMPHO2JJfL SGcQ== X-Received: by 10.224.12.140 with SMTP id x12mr2866584qax.42.1384098870941; Sun, 10 Nov 2013 07:54:30 -0800 (PST) Received: from [192.168.1.87] (108-214-96-27.lightspeed.sntcca.sbcglobal.net. [108.214.96.27]) by mx.google.com with ESMTPSA id s20sm31863814yhi.0.2013.11.10.07.54.29 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Sun, 10 Nov 2013 07:54:29 -0800 (PST) References: In-Reply-To: Mime-Version: 1.0 (1.0) Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii Message-Id: X-Mailer: iPhone Mail (11B511) From: Sharon Date: Sun, 10 Nov 2013 07:54:28 -0800 To: Yaakov Stein Cc: Russ White , "sdn@irtf.org" Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 10 Nov 2013 15:54:32 -0000 That's an excellent account of the problem statement... the clear need for immediate, non topological, non stochastic network cloud-= programming, And the CAP wall! As far as am ware there will never be a silver bullet solution, defiantly no= t (only) seaming lack of partition using out of band centralized circuit-flo= w switching. However there's a clear way to reduce the CAP for net-programming problem to= CAP to databases using flow-overlays with shared fate underlay-mapping. No= t a full solution but excellent proven best practices. Highly recommend taking a look at the solutions in this space, namely - lisp= 4 nvo, lisp 4 nfv --szb On Nov 6, 2013, at 7:42 PM, Yaakov Stein wrote: I would like to explain my comment at the meeting on the difference between t= he two planes, and add something about why the difference between the two is important. In the olden days, three planes were defined - the data or user (or forwardi= ng) plane, the control plane, and the management plane. The difference between the latter two was less functional than operational. The control plane was fast and distributed and local. The management plane was anything that required, or at least enabled, human i= ntervention. As an example, OAM messages are user plane (since they fate share with user d= ata), but may trigger control protocol operations such as protection switchi= ng, or may trigger alarms (management plane) or be used to collect statistics th= at can be retrieved via the management plane. Over time more and more "intelligent" operations that were once performed by= humans were replaced by software. However, two fundamental differences remained. First - since control plane operations are automatic they remain faster than= management plane operations.=20 Second - since humans were localized in NOCs the management intelligence rem= ains centralized, while control protocols are distributed. Why did these two planes not fuse ?=20 Because there are operations that are better carried out locally,=20 and there are others that are better managed from a central management site.= The reason has to do with the CAP theorem. I don't have the room to fully explain this here, but the CAP theorem dictates that at most two of consistency, availability, a= nd partition tolerance can be achieved simultaneously. Here the calculation to be carried out is how to forward packets from ingres= s to egress. In general, service providers are required to guarantee availability (e.g., f= ive nines) and partition tolerance (e.g., 50 msec) for operational services, and they forgo consistency (which is why we need OAM and TTL fields).=20 This can be carried out by distributed local control planes, but not by cent= ralized management systems. However, there are tasks that require consistency and can give up availabili= ty, such as new service creation; these require a centralized management system (which is why service activation is slow - it is not immediately available).= Network operations involves disciplined decision behind the use of one or th= e other plane for various tasks. What SDN has done is not so much separating the user plane from the control p= lane -=20 that was well known (and as aforementioned this misses the management plane)= . What SDN does is remove the control plane and rename the centralized managem= ent plane to be "control" instead. It does so at the expense of emphasizing consistency, but losing the ability= to simultaneously guarantee availability and partition tolerance. Y(J)S -----Original Message----- From: sdn-bounces@irtf.org [mailto:sdn-bounces@irtf.org] On Behalf Of Russ W= hite Sent: 06 November, 2013 19:59 To: sdn@irtf.org Subject: [Sdn] Thoughts on Defining control and Management Planes Y'all: In the SDN meeting, there was some discussion over the management and contro= l planes. I think defining these two is important in having consistent langu= age (hermeneutics being a hobby of mine, among many others). To wit, a possi= ble set of definitions for consideration and discussion. Not claiming these a= re perfect, but I do think we need to get past "this is faster than that," a= nd other permeable boundaries. - control plane: Those processes / configuration which directly impacts the i= nformation used to forward (or switch) traffic through a device. This would i= nclude distributed protocols, static configuration, etc. - management plane: Those processes or configuration that modify the operati= on of the control plane, or the general operation of the device on which the= control plane processes run. - data plane: The information and processes actually used to forward or proc= ess packets. So, for example: - OSPF is a control plane protocol - Configuring which interfaces OSPF runs on is a management function, since i= t impacts the operation of a control plane protocol - FORCES is a control plane protocol ( in the main) A single SDN system might interact with all three, of course (though I tend t= o believe these are different enough areas to warrant different solutions). I know there are probably hard cases that won't cleanly fit here, but we sho= uldn't let platypuses disturb our ability to differentiate between a duck an= d a beaver... Thoughts and discussion welcome, just would like to get this n= ailed down so we can actually have a common language to work from. :-) Russ <>< russw@riw.us Ericsson _______________________________________________ sdn mailing list sdn@irtf.org https://www.irtf.org/mailman/listinfo/sdn _______________________________________________ sdn mailing list sdn@irtf.org https://www.irtf.org/mailman/listinfo/sdn From scott.brim@gmail.com Sun Nov 10 10:11:54 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 29EFA11E81CC for ; Sun, 10 Nov 2013 10:11:54 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.553 X-Spam-Level: X-Spam-Status: No, score=-102.553 tagged_above=-999 required=5 tests=[AWL=0.046, BAYES_00=-2.599, HTML_MESSAGE=0.001, NO_RELAYS=-0.001, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Sp8ALNt9UvDi for ; Sun, 10 Nov 2013 10:11:53 -0800 (PST) Received: from mail-ob0-x234.google.com (mail-ob0-x234.google.com [IPv6:2607:f8b0:4003:c01::234]) by ietfa.amsl.com (Postfix) with ESMTP id 752DC11E80E6 for ; Sun, 10 Nov 2013 10:11:53 -0800 (PST) Received: by mail-ob0-f180.google.com with SMTP id vb8so537663obc.25 for ; Sun, 10 Nov 2013 10:11:52 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc:content-type; bh=KFbYJ6kuKMRK2cdWYoUSMVrAuAdetvT63ILL8+htGQ0=; b=LFvJpe38f6/mOL2NO1WnhSzu6sxqCroKqnSzRloscCfmUE2bz4R01tL6v4wd1Zpaf8 VnVi2MxId8M6MobfYvb8jUIzzlnBeELbyTdq42/9KZ+KohAxEZZ3Fd8YEO3EOox1jw4z IDshdZymbFVf1Hdrr53zcq3LBeIxysYV6orrkkYom2Qz0sW/Ovr3DlEpxP+7hazEfTCr hw999uzYsQZhZ3awCxpn6KKWbRtRTofhjTGHLa/qe05DzkK4CYgeNJpGlrUxoaU16F2a zwWJrW00OsQMBD73N6YsJbHK9Fgp121KX1bOVSUaDvbvRYqbhQSL+/0cCcxgItpQ5PeW rltw== X-Received: by 10.182.247.68 with SMTP id yc4mr23322obc.67.1384107112343; Sun, 10 Nov 2013 10:11:52 -0800 (PST) MIME-Version: 1.0 Received: by 10.182.2.134 with HTTP; Sun, 10 Nov 2013 10:11:32 -0800 (PST) In-Reply-To: References: From: Scott Brim Date: Sun, 10 Nov 2013 13:11:32 -0500 Message-ID: To: Russ White Content-Type: multipart/alternative; boundary=089e015384d6c3ee3304ead68cad Cc: "sdn@irtf.org" Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 10 Nov 2013 18:11:54 -0000 --089e015384d6c3ee3304ead68cad Content-Type: text/plain; charset=ISO-8859-1 Pardon the delay but now that the IETF is over ... For me the difference is between something that is supposed to be in continuous operation, and something that is supposed to set up that continuous operation. I see the former as control plane and forwarding plane, and the latter as management. When you perform a management function, then you can sit back and watch to make sure you did it right. A control function, on the other hand, continues _as part of_ things going right. If you look at it this way, management can manage more than the control plane - it manages all the functions it has to. I've seen management for different planes (and "layers", whatever you mean by them) partitioned, and only management of the forwarding plane considered to be the management plane proper -- just as we usually partition forwarding for the control and management planes from the forwarding plane proper. However you define it, I believe the essential characteristic is what I said above - management sets up the machinery and sits back to watch, while control is an essential part of the functioning of the machinery. The function of I2RS is to monitor and to set things up so that they will run right (including both control and forwarding) so I call I2RS management. SDN is a multifaceted beast but I would consider most of what people call SDN to focus on management interfaces, despite the nomenclature of "controllers" and so on. Yaakov, I disagree with you about local vs remote. That might have been true in what you worked on in your formative years but take a look at the formal modeling in SG15 and some of the SG13 "future network" documents. Control vs management - to the extent it matters - is orthogonal to how close the relationship is. People are right about functional definitions. A particular package like netconf is not part of any plane, rather its functions can be distributed across multiple planes, depending on goals and results. Scott --089e015384d6c3ee3304ead68cad Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
Pardon the delay but now that t= he IETF is over ...

For me the difference is between something that is supposed t= o be in continuous operation, and something that is supposed to set up that= continuous operation. =A0I see the former as control plane and forwarding = plane, and the latter as management. =A0When you perform a management funct= ion, then you can sit back and watch to make sure you did it right. =A0A co= ntrol function, on the other hand, continues _as part of_ things going righ= t. =A0

If you look= at it this way, management can manage more than the control plane - it man= ages all the functions it has to. =A0I've seen management for different= planes (and "layers", whatever you mean by them) partitioned, an= d only management of the forwarding plane considered to be the management p= lane proper -- just as we usually partition forwarding for the control and = management planes from the forwarding plane proper. However you define it, = I believe the essential characteristic is what I said above - management se= ts up the machinery and sits back to watch, while control is an essential p= art of the functioning of the machinery.

The functio= n of I2RS is to monitor and to set things up so that they will run right (i= ncluding both control and forwarding) so I call I2RS management. =A0SDN is = a multifaceted beast but I would consider most of what people call SDN to f= ocus on management interfaces, despite the nomenclature of "controller= s" and so on.

Yaakov, I d= isagree with you about local vs remote. That might have been true in what y= ou worked on in your formative years but take a look at the formal modeling= in SG15 and some of the SG13 "future network" documents. =A0Cont= rol vs management - to the extent it matters - is orthogonal to how close t= he relationship is.

People are = right about functional definitions. A particular package like netconf is no= t part of any plane, rather its functions can be distributed across multipl= e planes, depending on goals and results.

Scott
=
--089e015384d6c3ee3304ead68cad-- From russw@riw.us Sun Nov 10 20:36:01 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5AFAB11E81FE for ; Sun, 10 Nov 2013 20:36:01 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.221 X-Spam-Level: X-Spam-Status: No, score=-0.221 tagged_above=-999 required=5 tests=[AWL=-1.618, BAYES_50=0.001, MIME_QP_LONG_LINE=1.396] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id dqC5B2Wk-NGf for ; Sun, 10 Nov 2013 20:35:55 -0800 (PST) Received: from server.riw.us (server.riw.us [162.144.32.236]) by ietfa.amsl.com (Postfix) with ESMTP id 8DD0C11E81E8 for ; Sun, 10 Nov 2013 20:35:55 -0800 (PST) Received: from cpe-098-122-144-218.nc.res.rr.com ([98.122.144.218]:53134 helo=[192.168.100.55]) by server.riw.us with esmtpsa (TLSv1:AES128-SHA:128) (Exim 4.80.1) (envelope-from ) id 1VfjE9-0005aZ-GN; Mon, 11 Nov 2013 04:35:53 +0000 References: Mime-Version: 1.0 (1.0) In-Reply-To: Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Message-Id: <66422454-39A4-40F0-BFF6-986BFC4CAF9A@riw.us> X-Mailer: iPad Mail (11B511) From: Russ White Date: Sun, 10 Nov 2013 23:35:54 -0500 To: Scott Brim X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server.riw.us X-AntiAbuse: Original Domain - irtf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - riw.us X-Get-Message-Sender-Via: server.riw.us: authenticated_id: russ@riw.us X-Source: X-Source-Args: X-Source-Dir: Cc: "sdn@irtf.org" Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 11 Nov 2013 04:36:01 -0000 > For me the difference is between something that is supposed to be in conti= nuous operation, and something that is supposed to set up that continuous op= eration. I see the former as control plane and forwarding plane, and the la= tter as management. When you perform a management function, then you can si= t back and watch to make sure you did it right. A control function, on the o= ther hand, continues _as part of_ things going right. =20 I think this merges the control and data planes, though -- and I think we wa= nt to be able to differentiate between them. :-) Russ <>< russw@riw.us Ericsson From yaakov_s@rad.com Mon Nov 11 01:35:27 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D8C8521F9DA9 for ; Mon, 11 Nov 2013 01:35:26 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.39 X-Spam-Level: X-Spam-Status: No, score=-102.39 tagged_above=-999 required=5 tests=[AWL=-0.104, BAYES_00=-2.599, HOST_MISMATCH_COM=0.311, UNPARSEABLE_RELAY=0.001, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id p3pq33iMFclZ for ; Mon, 11 Nov 2013 01:35:22 -0800 (PST) Received: from rad.co.il (mailrelay01-ib1.rad.com [94.188.133.165]) by ietfa.amsl.com (Postfix) with ESMTP id 3175D21F99F8 for ; Mon, 11 Nov 2013 01:35:19 -0800 (PST) Received: from Internal Mail-Server by MailRelay01 (envelope-from yaakov?s@rad.com) with RC4-SHA encrypted SMTP; 11 Nov 2013 11:35:16 +0200 Received: from EXRAD6.ad.rad.co.il (2002:c072:18be::c072:18be) by exrad6.ad.rad.co.il (2002:c072:18be::c072:18be) with Microsoft SMTP Server (TLS) id 15.0.712.24; Mon, 11 Nov 2013 11:35:15 +0200 Received: from EXRAD6.ad.rad.co.il ([fe80::95ed:2d3a:ffd9:390a]) by exrad6.ad.rad.co.il ([fe80::95ed:2d3a:ffd9:390a%20]) with mapi id 15.00.0712.012; Mon, 11 Nov 2013 11:35:15 +0200 From: Yaakov Stein To: David Meyer Thread-Topic: [Sdn] Thoughts on Defining control and Management Planes Thread-Index: AQHO2xqln5belLyQLUuIkuyZNXbJhJoZGb3QgAC95ACABeaIIA== Date: Mon, 11 Nov 2013 09:35:14 +0000 Message-ID: References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [94.188.160.12] Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Commtouch-Refid: str=0001.0A090207.5280A4D4.00F9, ss=1, re=0.100, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0 (Unknown) Cc: Russ White , "sdn@irtf.org" , Scott Brim Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 11 Nov 2013 09:35:27 -0000 David,=20 I believe that the name "centralized control plane" is an oxymoron. I was just catching up on the emails on this list, and saw Scott's on the newer ITU-T work. All I can say is that I don't agree with what has happened since I stopped = contributing there. A few years back I heard in SG13 several people saying that the distinction= between control and management planes had become archaic, and that since the manage= ment plane no longer required manual intervention (since intelligent software performe= d the management tasks better and more reliably than humans) we should sett= le on a two-plane model. This is perhaps what you and Scott (and SDN enthusiasts in general) are pro= posing. However, the statement led me to consider what differences there may be bet= ween=20 two paths, once of which was a configured static route (i.e., set up by man= agement plane), and the other determined by a routing protocol (i.e., set up by control pla= ne). My first inclination was indeed that the speed of one vis-=E0-vis the other was no longer important, and indeed many "control protocols" now have relat= ively slow timers. But the centralized vs. distributed distinction was still in effect,=20 which meant some time duration effect, but more importantly a difference in= computational strength and consistency. Distributed routing protocols base themselves on the fundamental tenet of d= ynamic programming, that is, that in certain very special cases local decision can lead to a gl= obal optimum. Basically, routing protocols are good at finding basic connectivity, and pe= rhaps optimizing an additive criterion (e.g., hop count), but are dismal at= solving more complex tasks. On the other hand a centralized computation paradigm (assuming on full know= ledge at the centralized site), reduces arbitrary routing tasks to computat= ion on graphs,=20 which may be NP-complete, but are always, in principle, solvable. So, could this be the real difference between control and management planes= ? Could a control plane be for "simple" tasks that could be accomplished by d= istributed protocols, while the management plane was left for more complex tasks, that required m= ore knowledge to solve ? But then, why should we use distributed protocols at all ?=20 Distributed protocols are at best eventually consistent. Surely anything that they could do, a centralized platform could do better. Perhaps they would require more bandwidth (to send the request for computat= ion to the central site) and append additional delay (for the same reason),= but surely bandwidth is now cheap and this shouldn't be a major issue. But then I started considering the fact that the connection to the centrali= zed site may be lost, and started worrying about availability (the famous five nines), and fault = tolerance. Surely there were differences here. When I first heard Brewer's = result, it all fell into place. And the new emphasis of SDN proponents that packet forwarding is a computat= ional problem, provides the justification for applying the CAP theorem in t= he first place.=20 Since then, time and time again I have seen how tasks carried out by vetera= n service providers in particular ways are all exquisitely fashioned to mee= t CAP constraints. This is accomplished by performing some tasks using centralized management,= and others using distributed control. The control is always local, simple,= automatic (fast), reliable, but not necessarily optimal or consistent; whi= le the management is always consistent, complex, but possibly slow to respo= nd, and sometimes unavailable. This is not just history. This is a provable corollary of the CAP theorem.= =20 Eliminating the ability to choose which of the CAP constraints can be ignor= ed for a given task, means losing a crucial tool for service provision and = maintenance.=20 Those proposing providing high-availability and fault-tolerant services usi= ng a centralized architecture (i.e., a management system) don't understand = the consequences of the CAP theorem. Those striving to build "fault-tolerant SDN controllers" are deluding thems= elves. Bottom line, there is a need for both a local/distributed system, AND a rem= ote/centralized system. I think the names control and management are suitable denotations due to hi= storic convention, but you can rename them as long as you understand their separate purposes. Y(J)S -----Original Message----- From: David Meyer [mailto:dmm@1-4-5.net]=20 Sent: 07 November, 2013 18:38 To: Yaakov Stein Cc: Russ White; sdn@irtf.org Subject: Re: [Sdn] Thoughts on Defining control and Management Planes Yaakov, On Wed, Nov 6, 2013 at 7:42 PM, Yaakov Stein wrote: > I would like to explain my comment at the meeting on the difference=20 > between the two planes, and add something about why the difference betwee= n the two is important. First, thank you for your thoughtful analysis. > > In the olden days, three planes were defined - the data or user (or=20 > forwarding) plane, the control plane, and the management plane. > The difference between the latter two was less functional than operationa= l. > > The control plane was fast and distributed and local. > The management plane was anything that required, or at least enabled, hum= an intervention. > As an example, OAM messages are user plane (since they fate share with=20 > user data), but may trigger control protocol operations such as protectio= n switching, or may trigger alarms (management plane) or be used to collect= statistics that can be retrieved via the management plane. > > Over time more and more "intelligent" operations that were once=20 > performed by humans were replaced by software. However, two fundamental d= ifferences remained. > First - since control plane operations are automatic they remain faster t= han management plane operations. > Second - since humans were localized in NOCs the management=20 > intelligence remains centralized, while control protocols are distributed= . Agreed, this is history. But as I mentioned this paradigm (almost explicitly) no longer really applies (especially in the age of what I would= call "deep automation"; see e.g. [0]; but then I think we all know this). > > Why did these two planes not fuse ? > Because there are operations that are better carried out locally, and=20 > there are others that are better managed from a central management site. > > The reason has to do with the CAP theorem. > I don't have the room to fully explain this here, but the CAP theorem=20 > dictates that at most two of consistency, availability, and partition tol= erance can be achieved simultaneously. I highly advise [1] for folks seeking to get some intuition about what the = CAP theorem is all about. > Here the calculation to be carried out is how to forward packets from ing= ress to egress. > In general, service providers are required to guarantee availability=20 > (e.g., five nines) and partition tolerance (e.g., 50 msec) for=20 > operational services, and they forgo consistency (which is why we need OA= M and TTL fields). > This can be carried out by distributed local control planes, but not by c= entralized management systems. Proponents of centralized approaches might disagree. Personally it seems al= most trivial to see that a lower bound would be something like LB(convergence) =3D RTT(controller, switch) + PPT(controller) + PPT(switch) where RTT is the round trip time, and PPT is the packet processing time (note in = the case of something like OF you might have sum this over the entire path= ). > However, there are tasks that require consistency and can give up=20 > availability, such as new service creation; these require a=20 > centralized management system (which is why service activation is slow - = it is not immediately available). I would s/require/can make use of/g (require is a strong term that needs something to substantiate it). > Network operations involves disciplined decision behind the use of one=20 > or the other plane for various tasks. > > What SDN has done is not so much separating the user plane from the=20 > control plane - that was well known (and as aforementioned this misses th= e management plane). Yes, nothing new under the sun. However, separation of control and data pla= nes was a key component of what was perhaps early thinking about the attrib= utes of what was then called SDN. See e.g., [2] (or any number of other ref= erences). Now, if you are arguing that those definitions were either wrong = is fair game, however, that doesn't change the fact that control/data plane= separation was a key part of early definitions of SDN. > What SDN does is remove the control plane and rename the centralized mana= gement plane to be "control" instead. > It does so at the expense of emphasizing consistency, but losing the abil= ity to simultaneously guarantee availability and partition tolerance. That is also not clear. I can make the "centralized management plane" a distributed system as well, at which point the CAP theorem is in play. Thx, --dmm [0] http://www.theregister.co.uk/2013/11/04/google_living_omega_cloud/ [1] http://www.infoq.com/articles/cap-twelve-years-later-how-the-rules-have= -changed [2] https://www.opennetworking.org/sdn-resources/sdn-definition > > > Y(J)S > > > -----Original Message----- > From: sdn-bounces@irtf.org [mailto:sdn-bounces@irtf.org] On Behalf Of=20 > Russ White > Sent: 06 November, 2013 19:59 > To: sdn@irtf.org > Subject: [Sdn] Thoughts on Defining control and Management Planes > > Y'all: > > In the SDN meeting, there was some discussion over the management and con= trol planes. I think defining these two is important in having consistent l= anguage (hermeneutics being a hobby of mine, among many others). To wit, a = possible set of definitions for consideration and discussion. Not claiming = these are perfect, but I do think we need to get past "this is faster than = that," and other permeable boundaries. > > - control plane: Those processes / configuration which directly impacts t= he information used to forward (or switch) traffic through a device. This w= ould include distributed protocols, static configuration, etc. > > - management plane: Those processes or configuration that modify the oper= ation of the control plane, or the general operation of the device on which= the control plane processes run. > > - data plane: The information and processes actually used to forward or p= rocess packets. > > So, for example: > > - OSPF is a control plane protocol > - Configuring which interfaces OSPF runs on is a management function,=20 > since it impacts the operation of a control plane protocol > - FORCES is a control plane protocol ( in the main) > > A single SDN system might interact with all three, of course (though I te= nd to believe these are different enough areas to warrant different solutio= ns). > > I know there are probably hard cases that won't cleanly fit here, but we = shouldn't let platypuses disturb our ability to differentiate between a duc= k and a beaver... Thoughts and discussion welcome, just would like to get t= his nailed down so we can actually have a common language to work from. > > :-) > > Russ > > > > <>< > russw@riw.us > Ericsson > _______________________________________________ > sdn mailing list > sdn@irtf.org > https://www.irtf.org/mailman/listinfo/sdn > _______________________________________________ > sdn mailing list > sdn@irtf.org > https://www.irtf.org/mailman/listinfo/sdn From russw@riw.us Mon Nov 11 03:25:15 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D6B7B11E8162 for ; Mon, 11 Nov 2013 03:25:15 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.742 X-Spam-Level: X-Spam-Status: No, score=-0.742 tagged_above=-999 required=5 tests=[AWL=-0.557, BAYES_40=-0.185] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id OxTkbitBaN3t for ; Mon, 11 Nov 2013 03:25:09 -0800 (PST) Received: from server.riw.us (server.riw.us [162.144.32.236]) by ietfa.amsl.com (Postfix) with ESMTP id 99CA111E815E for ; Mon, 11 Nov 2013 03:25:08 -0800 (PST) Received: from cpe-098-122-144-218.nc.res.rr.com ([98.122.144.218]:56031 helo=RussPC) by server.riw.us with esmtpsa (TLSv1:AES128-SHA:128) (Exim 4.80.1) (envelope-from ) id 1Vfpc7-0002gh-Ou; Mon, 11 Nov 2013 11:25:04 +0000 From: "Russ White" To: "'Yaakov Stein'" , "'David Meyer'" References: In-Reply-To: Date: Mon, 11 Nov 2013 06:25:02 -0500 Message-ID: <001301ceded0$ab50b4c0$01f21e40$@riw.us> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Outlook 15.0 Thread-Index: AQENI0eiA8rOH7Iq3TRo8LAe8dZyDQFI1QtMAbjUhh0BxvBVopt9FQDA Content-Language: en-us X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server.riw.us X-AntiAbuse: Original Domain - irtf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - riw.us X-Get-Message-Sender-Via: server.riw.us: authenticated_id: russw@riw.us X-Source: X-Source-Args: X-Source-Dir: Cc: sdn@irtf.org, 'Scott Brim' Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 11 Nov 2013 11:25:16 -0000 > So, could this be the real difference between control and management > planes ? > Could a control plane be for "simple" tasks that could be accomplished by > distributed protocols, while the management plane was left for more > complex tasks, that required more knowledge to solve ? No, I don't buy this definition, either. Complexity level doesn't differentiate between the two. > I think the names control and management are suitable denotations due to > historic convention, but you can rename them as long as you understand > their separate purposes. I think the distinction is "what touches the information used by the data plane to forward traffic directly." It's simple, direct, and differentiates between control functions (like routing protocols, static routes, etc.), and the management plane (like environmentals, memory, cpu, control plane operation configuration and parameters, etc.). We're really struggling to make this theoretical, when what we want is something that's simple and easy to pin down in 90% of the cases. There might be hard cases to figure out, but hard cases make bad definitions. :-) Russ From yaakov_s@rad.com Mon Nov 11 05:31:36 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6F7B621E8091 for ; Mon, 11 Nov 2013 05:31:36 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.52 X-Spam-Level: X-Spam-Status: No, score=-102.52 tagged_above=-999 required=5 tests=[AWL=0.078, BAYES_00=-2.599, UNPARSEABLE_RELAY=0.001, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id wfe0pu7hdlc9 for ; Mon, 11 Nov 2013 05:31:30 -0800 (PST) Received: from rad.co.il (mailrelay02-q.rad.co.il [94.188.133.159]) by ietfa.amsl.com (Postfix) with ESMTP id 1035511E8149 for ; Mon, 11 Nov 2013 05:31:29 -0800 (PST) Received: from Internal Mail-Server by MailRelay02 (envelope-from yaakov?s@rad.com) with RC4-SHA encrypted SMTP; 11 Nov 2013 15:31:25 +0200 Received: from EXRAD6.ad.rad.co.il (2002:c072:18be::c072:18be) by exrad6.ad.rad.co.il (2002:c072:18be::c072:18be) with Microsoft SMTP Server (TLS) id 15.0.712.24; Mon, 11 Nov 2013 15:31:24 +0200 Received: from EXRAD6.ad.rad.co.il ([fe80::95ed:2d3a:ffd9:390a]) by exrad6.ad.rad.co.il ([fe80::95ed:2d3a:ffd9:390a%20]) with mapi id 15.00.0712.012; Mon, 11 Nov 2013 15:31:24 +0200 From: Yaakov Stein To: Russ White , 'David Meyer' Thread-Topic: [Sdn] Thoughts on Defining control and Management Planes Thread-Index: AQHO2xqln5belLyQLUuIkuyZNXbJhJoZGb3QgAC95ACABeaIIIAAC20AgAAwjYA= Date: Mon, 11 Nov 2013 13:31:24 +0000 Message-ID: <4d2ee44e6fcb4dd18a26f8bc33c8abf1@exrad6.ad.rad.co.il> References: <001301ceded0$ab50b4c0$01f21e40$@riw.us> In-Reply-To: <001301ceded0$ab50b4c0$01f21e40$@riw.us> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [94.188.160.12] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Commtouch-Refid: str=0001.0A090204.5280DC2E.000F, ss=1, re=0.100, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0 (Unknown) Cc: "sdn@irtf.org" , 'Scott Brim' Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 11 Nov 2013 13:31:36 -0000 Russ Perhaps we should first agree on specific cases. I assume that you agree that routing protocols are part of the control plan= e, while configuring policies, identifiers, and which protocols to use are man= agement operations. What about static routes ? Are these management plane ? According to your definition there aren't (they touch information used by t= he user plane). But they can be considered a rather strict policy as to how to handle a spe= cific kind of packet. What about fault management functions ? According to conventional wisdom, OAM protocols are user plane (they MUST b= e, since their purpose is to share fate with user traffic), but they can tr= igger automatic protection switching or fast reroute (control plane operati= ons), and/or raise alarms (management plane). But what if I have some software in the OSS that detects that protection sw= itching didn't work, and forces a switchover. That certainly touches the behavior of the user pl= ane - does that make it control plane ? What if a human made the decision t= o force a switchover ? Is the human a control plane function ? Y(J)S -----Original Message----- From: Russ White [mailto:russw@riw.us]=20 Sent: 11 November, 2013 13:25 To: Yaakov Stein; 'David Meyer' Cc: 'Scott Brim'; sdn@irtf.org Subject: RE: [Sdn] Thoughts on Defining control and Management Planes > So, could this be the real difference between control and management=20 > planes ? > Could a control plane be for "simple" tasks that could be accomplished=20 > by distributed protocols, while the management plane was left for more=20 > complex tasks, that required more knowledge to solve ? No, I don't buy this definition, either. Complexity level doesn't different= iate between the two. > I think the names control and management are suitable denotations due=20 > to historic convention, but you can rename them as long as you=20 > understand their separate purposes. I think the distinction is "what touches the information used by the data p= lane to forward traffic directly." It's simple, direct, and differentiates= between control functions (like routing protocols, static routes, etc.), a= nd the management plane (like environmentals, memory, cpu, control plane op= eration configuration and parameters, etc.). We're really struggling to make this theoretical, when what we want is some= thing that's simple and easy to pin down in 90% of the cases. There might b= e hard cases to figure out, but hard cases make bad definitions. :-) Russ From hadi@mojatatu.com Mon Nov 11 05:42:00 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id CFD4411E8149 for ; Mon, 11 Nov 2013 05:42:00 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.952 X-Spam-Level: X-Spam-Status: No, score=-102.952 tagged_above=-999 required=5 tests=[AWL=0.025, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, RCVD_IN_DNSWL_LOW=-1, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id I2Xr1tVPDL3N for ; Mon, 11 Nov 2013 05:41:55 -0800 (PST) Received: from mail-vb0-f45.google.com (mail-vb0-f45.google.com [209.85.212.45]) by ietfa.amsl.com (Postfix) with ESMTP id 9972911E80FA for ; Mon, 11 Nov 2013 05:41:55 -0800 (PST) Received: by mail-vb0-f45.google.com with SMTP id p6so3217658vbe.18 for ; Mon, 11 Nov 2013 05:41:54 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:from:date:message-id:subject:to:cc :content-type; bh=ioQJYNFTWdBijU2Gns4EJqIRQlh+r8RrPvEvkIeA+vs=; b=D6kFvQ6OXZIw69CFxM6paCmzl+Y1FjVoYC8otlTQR+tT++F1fjd3Xxay/T07T4Etjy GJsNyUEmJXfgkAiytGR8ZP0GILbfj4NzBDl/m4m1CWJ1+ZzxIHCWvOrDdjIlKRswjXkL QjU8/9j+02uv4wkOj5+zwRYz8B2q3n6JhHfNKBhXBD8mXIkEsM7XdSwxc32H1uIPYH2T QEp929+c0BJKU9AVgbh94woWQ+jz/laHC4cHH3K3XmY9eeIEaeRC3MIQhoSdbtR0vPlb 8H51fd8wbjlqr8+AY6RcBZCnwjET6CUEy7lxVclh5oKaDIyzP64uFlXyFm5gyGEbiSLF 2VOA== X-Gm-Message-State: ALoCoQldcwgh4GTbGxd5mLzRZm8qGvdBHNSg5U9yb9QwRQl+9WmFFXqUUWbuT0U9GmJtIEED1fs9 X-Received: by 10.52.233.2 with SMTP id ts2mr121560vdc.44.1384177314764; Mon, 11 Nov 2013 05:41:54 -0800 (PST) MIME-Version: 1.0 Received: by 10.58.8.19 with HTTP; Mon, 11 Nov 2013 05:41:34 -0800 (PST) From: Jamal Hadi Salim Date: Mon, 11 Nov 2013 08:41:34 -0500 Message-ID: To: David Meyer Content-Type: text/plain; charset=ISO-8859-1 Cc: Russ White , Yaakov Stein , "sdn@irtf.org" Subject: [Sdn] Timeliness WAS(Re: Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 11 Nov 2013 13:42:01 -0000 While I am enjoying Yaakov's postings, let me just zone in on one issue: On Thu, Nov 7, 2013 at 11:37 AM, David Meyer wrote: > LB(convergence) = RTT(controller, switch) + PPT(controller) + PPT(switch) > > where > > RTT is the round trip time, and PPT is the packet processing time > (note in the case of something like OF you might have sum this over > the entire path). As Yaakov points out - there is the "human intervention" aspect in what would be labelled as "management". This is the point that was being made in our draft as well. If you have a human in the loop, the PPT(controller) is typically designed to have tolerance in the seconds range. Granted the new kids (and OSS/BSS) solutions have mostly removed the human from the loop. The challenge as we express in the draft is that the underlying protocols are not designed to handle the rates a machine can generate. Execing a CLI via a bash script is still in the 100s of milliseconds. Netconf being ascii has high PPT on both ends (the switch i am running has a tiny ppc 32 bit processor which doesnt have any offload for string processing). On the other hand OF or ForCES were designed from ground up to be able to handle large transaction rates. Is someone making the contention that this is no longer important just because we now have automation as a driver? If you are - please explain why ;-> cheers, jamal From russw@riw.us Mon Nov 11 05:50:54 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 357FD11E8172 for ; Mon, 11 Nov 2013 05:50:54 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.87 X-Spam-Level: X-Spam-Status: No, score=-1.87 tagged_above=-999 required=5 tests=[AWL=0.729, BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id dXE6S4QbtXN8 for ; Mon, 11 Nov 2013 05:50:48 -0800 (PST) Received: from server.riw.us (server.riw.us [162.144.32.236]) by ietfa.amsl.com (Postfix) with ESMTP id 5797411E80FA for ; Mon, 11 Nov 2013 05:50:48 -0800 (PST) Received: from cpe-098-122-144-218.nc.res.rr.com ([98.122.144.218]:59679 helo=RussPC) by server.riw.us with esmtpsa (TLSv1:AES128-SHA:128) (Exim 4.80.1) (envelope-from ) id 1Vfrt3-0003eO-C9; Mon, 11 Nov 2013 13:50:42 +0000 From: "Russ White" To: "'Yaakov Stein'" , "'David Meyer'" References: <001301ceded0$ab50b4c0$01f21e40$@riw.us> <4d2ee44e6fcb4dd18a26f8bc33c8abf1@exrad6.ad.rad.co.il> In-Reply-To: <4d2ee44e6fcb4dd18a26f8bc33c8abf1@exrad6.ad.rad.co.il> Date: Mon, 11 Nov 2013 08:50:41 -0500 Message-ID: <00d201cedee5$039eaa10$0adbfe30$@riw.us> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Outlook 15.0 Thread-Index: AQENI0eiA8rOH7Iq3TRo8LAe8dZyDQFI1QtMAbjUhh0BxvBVogKnk/x4AZ6SrJKbWwjuMA== Content-Language: en-us X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server.riw.us X-AntiAbuse: Original Domain - irtf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - riw.us X-Get-Message-Sender-Via: server.riw.us: authenticated_id: russw@riw.us X-Source: X-Source-Args: X-Source-Dir: Cc: sdn@irtf.org, 'Scott Brim' Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 11 Nov 2013 13:50:54 -0000 > Perhaps we should first agree on specific cases. I think we need a general definition based on the underlying assumptions in devices and protocols already in use. If we propound a few dozen specific cases, we're going to find we can always build specific models for each one. The reason I started this thread was to find a single definition that we could all build on, even if it doesn't fit every situation perfectly. If we don't have common ground, the only discussion we're going to have is about which specific case is the most interesting/pertinent/what I have a customer trying to do/etc. -- a conversation that's not going to lead us anywhere, in the end. > I assume that you agree that routing protocols are part of the control plane, > while configuring policies, identifiers, and which protocols to use are > management operations. > > What about static routes ? Are these management plane ? Control plane --they touch the databases used to forward packets directly. > But they can be considered a rather strict policy as to how to handle a specific > kind of packet. Forget policy for the moment -- part of the problem is we want to merge different things into a single humongous model that covers the entire ocean in one sweep. Down that path lies confusion. Break the problem apart, and deal with each part. Policy is a different problem, a different thread, and a different definition. > What about fault management functions ? First option -- 1. The instant removal of local data plane forwarding information from the forwarding path on a local interface state change, so this would be in the data plane. 2. The subsequent notification of management and control planes to trigger processes to modify the data plane forwarding tables, etc. This would seem to fall into the control plane if the notification is to a control plane protocol, and into the management plane if the notification is to a management plane system. IE, reporting for fault management would be considered management plane, while notification for reconvergence of the control plane (whether distributed or centralized) would fall into the control plane. I know there's overlap here, but again, hard cases make bad definitions. Second option -- All messages and protocols are classified on where they originate or "run" (???). In this case, notifications based on changes to the data plane would be consider part of the data plane. I'm ambivalent about which of these two is better, but I tend to think the second is probably clearer in the long run. > According to conventional wisdom, OAM protocols are user plane (they > MUST be, since their purpose is to share fate with user traffic), but they can > trigger automatic protection switching or fast reroute (control plane > operations), and/or raise alarms (management plane). Don't worry about whether the management traffic shares fate with the data plane traffic --again, a different topic. If we reach out into side issues far enough, we wind up without any meaningful definition, because we can always find some instance that seems at least tangentially related, and yet doesn't seem to fit into the definition absolutely. IE, narrowing scope is the best way to get good definitions. Conventional wisdom is going to get us just where we are today -- a lot of presentations about interesting stuff, but no real way to set goals and move towards them, IMHO. :-) Russ From russw@riw.us Mon Nov 11 05:59:18 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A30EE21E80CA for ; Mon, 11 Nov 2013 05:59:18 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.961 X-Spam-Level: X-Spam-Status: No, score=-1.961 tagged_above=-999 required=5 tests=[AWL=0.638, BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id T7qLw2w-59cT for ; Mon, 11 Nov 2013 05:59:12 -0800 (PST) Received: from server.riw.us (server.riw.us [162.144.32.236]) by ietfa.amsl.com (Postfix) with ESMTP id C04CE21E8091 for ; Mon, 11 Nov 2013 05:59:12 -0800 (PST) Received: from cpe-098-122-144-218.nc.res.rr.com ([98.122.144.218]:59794 helo=RussPC) by server.riw.us with esmtpsa (TLSv1:AES128-SHA:128) (Exim 4.80.1) (envelope-from ) id 1Vfs1F-0003hs-Ga; Mon, 11 Nov 2013 13:59:09 +0000 From: "Russ White" To: "'Jamal Hadi Salim'" , "'David Meyer'" References: In-Reply-To: Date: Mon, 11 Nov 2013 08:59:09 -0500 Message-ID: <00dc01cedee6$327f9730$977ec590$@riw.us> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Outlook 15.0 Thread-Index: AQKSXn4n3hDi42+hLGgUk8fxj5gdlpiZDS6Q Content-Language: en-us X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server.riw.us X-AntiAbuse: Original Domain - irtf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - riw.us X-Get-Message-Sender-Via: server.riw.us: authenticated_id: russw@riw.us X-Source: X-Source-Args: X-Source-Dir: Cc: 'Yaakov Stein' , sdn@irtf.org Subject: Re: [Sdn] Timeliness WAS(Re: Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 11 Nov 2013 13:59:18 -0000 > Is someone making the contention that this is no longer important just > because we now have automation as a driver? If you are - please explain why > ;-> There's a difference between setting definitions to ground a conversation and deciding what is important within the realms thus defined... In fact, the point you're trying to make -- that automation makes the current assumptions underlying "management plane" operations problematic -- is specifically the situation you get when you start with what I consider to be a bad definition. If you define the management plane as "those things which interact with the device on which the control plane and data planes run, and those things that interact with the way the control plane operates," (in other words, what doesn't fit into the control or data planes fits into the management plane), then you can quickly see there should be absolutely no assumption about timing and speed of operation between the three. When you define management plane as, "those things which interact with humans," you imply timing -- and hence either are forced to consider virtually everything that's automated part of the control plane (including checking the temperature of the processors on the box, or the speed of a hard drive spin, etc.), simply because it's automated. In this case, a bad definition drives us to muddling two different sets of functionality into one "thing," which makes it much harder to think through the problem of centralized verses distributed control planes, what's needed where, etc. (a distributed protocol to carry the cpu temp to all devices in the network, anyone??). The bottom line, to me, is that routers and switches process packets. Models designed to help us understand and classify the operation of networks based on routers and switches should, therefore, be based on processing packets -- not services, not collections of such devices, not naming systems, and not use cases. Once we get the idea of what a forwarding system looks like, then we can begin to fumble our way around trying to figure out what a group of these things looks like, acts, can be controlled, etc. :-) Russ From hadi@mojatatu.com Mon Nov 11 06:17:47 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C3E6621F9D52 for ; Mon, 11 Nov 2013 06:17:47 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.954 X-Spam-Level: X-Spam-Status: No, score=-102.954 tagged_above=-999 required=5 tests=[AWL=0.023, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, RCVD_IN_DNSWL_LOW=-1, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id kzTz6ZH1+s4o for ; Mon, 11 Nov 2013 06:17:42 -0800 (PST) Received: from mail-vb0-f49.google.com (mail-vb0-f49.google.com [209.85.212.49]) by ietfa.amsl.com (Postfix) with ESMTP id CC9C221F9FDA for ; Mon, 11 Nov 2013 06:17:39 -0800 (PST) Received: by mail-vb0-f49.google.com with SMTP id o19so755426vbm.8 for ; Mon, 11 Nov 2013 06:17:39 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc:content-type; bh=fZKkYZyISx2ufV1X3bzrltVrxo27fn14hwelzMd+T2E=; b=iJ72DAA/8FOEar9+NJb5DNImZFJEPb+6qKTErXG9C5WHz+stNmSwDGjx9b4muhHGXF zOZfB4JcMSUvJooOgD21sZlmgn7jHib012Kraxud49LfMxsRYpPxAKZZSWwONAHd1uIa KvtSWvonWjCnLHJsLqju2I9Alxzn1D95H2R0RTTdC4fxVtYAK4aD86s3K9CwSHwFsnGv Up1fxtySSQ+QWihPuAvBzGm1k9s3kBQYhhJm7OPW9RDAM1U0hTh4xg3YK0VeLtZmSJc8 Aq7t36i+dIccUSEUS9xaifJa1opnEYVZuERPbU3SpdaufZDuKUDpvxMrg72keCVqmW3h /QCg== X-Gm-Message-State: ALoCoQlpluEDbRwS97i6l1jIgK9dMfbAcxMoS9hAh3cdRwfGGLPOCNh9ZeL42AtYEH+eFMsPI/VP X-Received: by 10.58.255.233 with SMTP id at9mr5147854ved.20.1384179459211; Mon, 11 Nov 2013 06:17:39 -0800 (PST) MIME-Version: 1.0 Received: by 10.58.8.19 with HTTP; Mon, 11 Nov 2013 06:17:19 -0800 (PST) In-Reply-To: <00dc01cedee6$327f9730$977ec590$@riw.us> References: <00dc01cedee6$327f9730$977ec590$@riw.us> From: Jamal Hadi Salim Date: Mon, 11 Nov 2013 09:17:19 -0500 Message-ID: To: Russ White Content-Type: text/plain; charset=ISO-8859-1 Cc: David Meyer , Yaakov Stein , "sdn@irtf.org" Subject: Re: [Sdn] Timeliness WAS(Re: Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 11 Nov 2013 14:17:47 -0000 On Mon, Nov 11, 2013 at 8:59 AM, Russ White wrote: > There's a difference between setting definitions to ground a conversation > and deciding what is important within the realms thus defined... In fact, > the point you're trying to make -- that automation makes the current > assumptions underlying "management plane" operations problematic -- is > specifically the situation you get when you start with what I consider to be > a bad definition. > > If you define the management plane as "those things which > interact with the device on which the control plane and data planes run, and > those things that interact with the way the control plane operates," (in > other words, what doesn't fit into the control or data planes fits into the > management plane), then you can quickly see there should be absolutely no > assumption about timing and speed of operation between the three. > [comments below] > When you define management plane as, "those things which interact with > humans," you imply timing -- and hence either are forced to consider > virtually everything that's automated part of the control plane (including > checking the temperature of the processors on the box, or the speed of a > hard drive spin, etc.), simply because it's automated. In this case, a bad > definition drives us to muddling two different sets of functionality into > one "thing," which makes it much harder to think through the problem of > centralized verses distributed control planes, what's needed where, etc. (a > distributed protocol to carry the cpu temp to all devices in the network, > anyone??). > Timing is relevant IMO for the historical nature around it. Yaakov aptly pointed out the human loop. Protocols and interfaces that are today automated were designed with a human loop in mind. Usability for example is an important factor. > The bottom line, to me, is that routers and switches process packets. Models > designed to help us understand and classify the operation of networks based > on routers and switches should, therefore, be based on processing packets -- > not services, not collections of such devices, not naming systems, and not > use cases. Once we get the idea of what a forwarding system looks like, then > we can begin to fumble our way around trying to figure out what a group of > these things looks like, acts, can be controlled, etc. > > :-) We are sticking to the term "resources" in our doc for "things that you interact with" - regardless of where they sit. Someone/thing that has brains either controls or manages those "things". Datapath is a packet processing resource; but: that is just one resource that exists in a datapath. If i am setting a debug level for logs on a line card then that is a different resource altogether. Your response that entering a static route makes it a control plane activity i think needs to be qualified. If i enter a static route from a CLI - that is a management activity because the timeliness is not as important as if i exported the same route from an IGP. I would argue this has nothing to do with whether the later is automated or not; more to the urgency of it. So, IMO - automation does not qualify something as "control"; the interfaces are not ready for it and timeliness is a factor. cheers, jamal From pedromj@um.es Mon Nov 11 06:19:26 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 50D5E11E817F for ; Mon, 11 Nov 2013 06:19:26 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -6.599 X-Spam-Level: X-Spam-Status: No, score=-6.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 3mKadYAVIEzw for ; Mon, 11 Nov 2013 06:19:20 -0800 (PST) Received: from xenon12.um.es (xenon12.um.es [155.54.212.166]) by ietfa.amsl.com (Postfix) with ESMTP id AB58B11E817E for ; Mon, 11 Nov 2013 06:19:10 -0800 (PST) Received: from localhost (localhost [127.0.0.1]) by xenon12.um.es (Postfix) with ESMTP id 4D12A4C4AA for ; Mon, 11 Nov 2013 15:19:09 +0100 (CET) X-Virus-Scanned: by antispam in UMU at xenon12.um.es Received: from xenon12.um.es ([127.0.0.1]) by localhost (xenon12.um.es [127.0.0.1]) (amavisd-new, port 10024) with LMTP id e6OjhzVzABK8 for ; Mon, 11 Nov 2013 15:19:09 +0100 (CET) Received: from localhost (unknown [46.25.162.195]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) (Authenticated sender: pedromj@um.es) by xenon12.um.es (Postfix) with ESMTPSA id 7441E4C4A6 for ; Mon, 11 Nov 2013 15:19:08 +0100 (CET) Date: Mon, 11 Nov 2013 15:19:07 +0100 From: Pedro Martinez-Julia To: sdn@irtf.org Message-ID: <20131111141907.GO17999@um.es> References: <001301ceded0$ab50b4c0$01f21e40$@riw.us> <4d2ee44e6fcb4dd18a26f8bc33c8abf1@exrad6.ad.rad.co.il> <00d201cedee5$039eaa10$0adbfe30$@riw.us> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <00d201cedee5$039eaa10$0adbfe30$@riw.us> User-Agent: Mutt/1.5.22 (2013-10-16) Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 11 Nov 2013 14:19:26 -0000 On Mon, Nov 11, 2013 at 08:50:41AM -0500, Russ White wrote: > > Second option -- > > All messages and protocols are classified on where they originate or "run" > (???). In this case, notifications based on changes to the data plane would > be consider part of the data plane. > This option *must* not be considered. It is really confusing the terms and may confuse anyone working with them. The notifications originated from a network device can never be considered part of the data plane and the functional block that sends it can never be part of the data plane. Again, from my point of view, protocol/function classification is very clear. In a device centric model: - Data Plane: Those protocols/functions that forward data from incoming to outgoing interfaces/ports. - Control Plane: Those protocols/functions that change the information used by the protocols/functions of the data plane (forwarding tables) in order to achieve the objectives or general operation of the device. - Management Plane: Those protocols/functions used to monitor the status of a device, set configuration parameters and general policies that the device must enforce to achieve its objectives (yes, definition of policies is part of the management plane), etc. The management plane may be a bit "catchall" but all its functions come from administrative decisions, so it is tied to management operation. Regards, Pedro -- Pedro Martinez-Julia Department of Communication and Information Engineering Faculty of Computer Science University of Murcia Email: pedromj@um.es --------------------------------------------------------- *** Entia non sunt multiplicanda praeter necessitatem *** From rraszuk@gmail.com Mon Nov 11 06:29:05 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 97FA821E81E1 for ; Mon, 11 Nov 2013 06:29:05 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.485 X-Spam-Level: X-Spam-Status: No, score=-1.485 tagged_above=-999 required=5 tests=[AWL=0.493, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id sziLgiGjy-jA for ; Mon, 11 Nov 2013 06:29:05 -0800 (PST) Received: from mail-ie0-x22d.google.com (mail-ie0-x22d.google.com [IPv6:2607:f8b0:4001:c03::22d]) by ietfa.amsl.com (Postfix) with ESMTP id 41AD621F9D2E for ; Mon, 11 Nov 2013 06:28:55 -0800 (PST) Received: by mail-ie0-f173.google.com with SMTP id x13so5265102ief.32 for ; Mon, 11 Nov 2013 06:28:49 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:date:message-id:subject :from:to:cc:content-type; bh=OHQNlDouvgvzmlaljtyw5MX6vnvDAaAVh9JsOiS8h+w=; b=zi9VmFFYLrRFX0M/Da3AlbFYakxI2CnWd2J2XYMOCVcw4Lq00tfOs5cXbhyNBBss+A cvQZb7ke/ZzyfWqp53BRf8ZSGp+CPdJh2Vavths0NuVB3EolsBk85ieoDsKPIcFubFhr dowpSBtQX7aWjsvBvYk+CmWb/q2NYwvZRv98/yrSsSrOA0WI8J6dddbFwCdgCqa/OaDm 4G8kqGGCMEdqt8/xl2abg0qM8Heae6GPlBB+dOasVf/hNrpbnZ7H0/DUqYYQI/LCSq8z 4+/5K08DjEfv4IJJzL83TVveysh5PNe0QuFKn6PDDxMBKYrFKcQrj5qdqXEEw3vS+6vJ jrGg== MIME-Version: 1.0 X-Received: by 10.50.61.35 with SMTP id m3mr12573758igr.56.1384180129831; Mon, 11 Nov 2013 06:28:49 -0800 (PST) Sender: rraszuk@gmail.com Received: by 10.64.61.129 with HTTP; Mon, 11 Nov 2013 06:28:49 -0800 (PST) In-Reply-To: <20131111141907.GO17999@um.es> References: <001301ceded0$ab50b4c0$01f21e40$@riw.us> <4d2ee44e6fcb4dd18a26f8bc33c8abf1@exrad6.ad.rad.co.il> <00d201cedee5$039eaa10$0adbfe30$@riw.us> <20131111141907.GO17999@um.es> Date: Mon, 11 Nov 2013 15:28:49 +0100 X-Google-Sender-Auth: 9z7GeKQ-Ixku5H3iFosglPlzL0A Message-ID: From: Robert Raszuk To: Pedro Martinez-Julia Content-Type: text/plain; charset=ISO-8859-1 Cc: SDN IRTF list Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 11 Nov 2013 14:29:05 -0000 How would you classify BFD running between two devices ? To which plane in your "very clear" model does it belong ? Best, r. > Again, from my point of view, protocol/function classification is very > clear. In a device centric model: > - Data Plane: Those protocols/functions that forward data from incoming > to outgoing interfaces/ports. > - Control Plane: Those protocols/functions that change the information > used by the protocols/functions of the data plane (forwarding tables) > in order to achieve the objectives or general operation of the device. > - Management Plane: Those protocols/functions used to monitor the status > of a device, set configuration parameters and general policies that > the device must enforce to achieve its objectives (yes, definition of > policies is part of the management plane), etc. > > The management plane may be a bit "catchall" but all its functions come > from administrative decisions, so it is tied to management operation. > > Regards, > Pedro From russw@riw.us Mon Nov 11 06:30:08 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0E4EE21E81EE for ; Mon, 11 Nov 2013 06:30:08 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.032 X-Spam-Level: X-Spam-Status: No, score=-2.032 tagged_above=-999 required=5 tests=[AWL=0.567, BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id wLEf3XsV99gv for ; Mon, 11 Nov 2013 06:30:02 -0800 (PST) Received: from server.riw.us (server.riw.us [162.144.32.236]) by ietfa.amsl.com (Postfix) with ESMTP id E592721E815D for ; Mon, 11 Nov 2013 06:30:01 -0800 (PST) Received: from cpe-098-122-144-218.nc.res.rr.com ([98.122.144.218]:61894 helo=RussPC) by server.riw.us with esmtpsa (TLSv1:AES128-SHA:128) (Exim 4.80.1) (envelope-from ) id 1VfsV2-0003tb-9g; Mon, 11 Nov 2013 14:29:56 +0000 From: "Russ White" To: "'Jamal Hadi Salim'" References: <00dc01cedee6$327f9730$977ec590$@riw.us> In-Reply-To: Date: Mon, 11 Nov 2013 09:29:56 -0500 Message-ID: <012501cedeea$7f46c120$7dd44360$@riw.us> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Outlook 15.0 Thread-Index: AQKSXn4n3hDi42+hLGgUk8fxj5gdlgGzlX7SAms++cyYeB4YgA== Content-Language: en-us X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server.riw.us X-AntiAbuse: Original Domain - irtf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - riw.us X-Get-Message-Sender-Via: server.riw.us: authenticated_id: russw@riw.us X-Source: X-Source-Args: X-Source-Dir: Cc: 'David Meyer' , 'Yaakov Stein' , sdn@irtf.org Subject: Re: [Sdn] Timeliness WAS(Re: Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 11 Nov 2013 14:30:08 -0000 > > If you define the management plane as "those things which interact > > with the device on which the control plane and data planes run, and > > those things that interact with the way the control plane operates," > > (in other words, what doesn't fit into the control or data planes fits > > into the management plane), then you can quickly see there should be > > absolutely no assumption about timing and speed of operation between > the three. > > > When you define management plane as, "those things which interact with > > humans," you imply timing -- and hence either are forced to consider > > virtually everything that's automated part of the control plane > > (including checking the temperature of the processors on the box, or > > the speed of a hard drive spin, etc.), simply because it's automated. > > In this case, a bad definition drives us to muddling two different > > sets of functionality into one "thing," which makes it much harder to > > think through the problem of centralized verses distributed control > > planes, what's needed where, etc. (a distributed protocol to carry the > > cpu temp to all devices in the network, anyone??). > > Timing is relevant IMO for the historical nature around it. Yaakov aptly > pointed out the human loop. Protocols and interfaces that are today > automated were designed with a human loop in mind. Usability for example > is an important factor. So, should we put absolute times around it then? - Data Plane -- timing less than 500ms - Control Plane --timing greater than 501ms and less than 10 seconds - Management Plane -- timing greater than 10 seconds Do humans with faster reaction times now count as control planes rather than management planes? Or are all managers just slower than all "control humans?" :-) Sorry, this doesn't work --I don't care what the "historical nature," is... We don't want a definition that's "historically accurate," or etymologically correct. We want a definition that will work to build a solid model of device operation on which we can build a solid model of network and services operation. > We are sticking to the term "resources" in our doc for "things that you > interact with" - regardless of where they sit. Someone/thing that has brains > either controls or manages those "things". Stick with whatever you'd like --but I'm going to continue to argue with every revision of your doc that your definitions don't reflect a usable model in the real world. What is "brains?" Anything that does processing? And what happens when two "brains" interact? Is the interaction itself another "resource?" These definitions are so broad as to say just about anything. > Your response that entering a static route makes it a control plane activity i > think needs to be qualified. If i enter a static route from a CLI - that is a > management activity because the timeliness is not as important as if i > exported the same route from an IGP. So a static route entered by an automated process which is faster than a distributed control plane is not control plane simply because it's traditionally entered by fingers on a keyboard? I suppose it all depends on the typing speed of the person on the keyboard... ?? And setting up the configuration to export a route from an IGP is somehow faster than configuring a static route? > So, IMO - automation does not qualify something as "control"; the interfaces > are not ready for it and timeliness is a factor. You are trying to define something based on a mixture of requirements and operations. "This operates that way, so it is x, but the timing of that is y, so it is y." When you encounter overlaps, these definitions aren't going to work --nor are they useful to describe timing requirements. If I want to describe a requirement for a management plane operation that executes in less time than you've allowed, must I now call it a data plane requirement, no matter where it executes? In other words, "I need to check the cpu temperature every 200 ms for the next 10 seconds," is now a data plane requirement simply because it's fast, not because of the operation actually being performed. The only way towards clarity is to separate timing --traditional, historical, modern, or future-- from the operations. Then you can describe an operation, determine the timing requirements for performing that operation, and then design a system that reaches those performance requirements. Simply saying, "this is slower, so it's control plane, and that's slower still, so it's management plane," won't help with that process at all. :-) Russ From russw@riw.us Mon Nov 11 06:31:13 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B2F4821E81E5 for ; Mon, 11 Nov 2013 06:31:12 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.088 X-Spam-Level: X-Spam-Status: No, score=-2.088 tagged_above=-999 required=5 tests=[AWL=0.511, BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id JhUB1w8e5PSt for ; Mon, 11 Nov 2013 06:31:03 -0800 (PST) Received: from server.riw.us (server.riw.us [162.144.32.236]) by ietfa.amsl.com (Postfix) with ESMTP id 0E60F21E815D for ; Mon, 11 Nov 2013 06:31:03 -0800 (PST) Received: from cpe-098-122-144-218.nc.res.rr.com ([98.122.144.218]:61903 helo=RussPC) by server.riw.us with esmtpsa (TLSv1:AES128-SHA:128) (Exim 4.80.1) (envelope-from ) id 1VfsVv-0003uY-6p; Mon, 11 Nov 2013 14:30:53 +0000 From: "Russ White" To: "'Robert Raszuk'" , "'Pedro Martinez-Julia'" References: <001301ceded0$ab50b4c0$01f21e40$@riw.us> <4d2ee44e6fcb4dd18a26f8bc33c8abf1@exrad6.ad.rad.co.il> <00d201cedee5$039eaa10$0adbfe30$@riw.us> <20131111141907.GO17999@um.es> In-Reply-To: Date: Mon, 11 Nov 2013 09:30:51 -0500 Message-ID: <012601cedeea$a00097b0$e001c710$@riw.us> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Outlook 15.0 Thread-Index: AQENI0eiA8rOH7Iq3TRo8LAe8dZyDQFI1QtMAbjUhh0BxvBVogKnk/x4AZ6SrJICDtdm1QI/0JY2Aq9RpP2bIyiuQA== Content-Language: en-us X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server.riw.us X-AntiAbuse: Original Domain - irtf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - riw.us X-Get-Message-Sender-Via: server.riw.us: authenticated_id: russw@riw.us X-Source: X-Source-Args: X-Source-Dir: Cc: 'SDN IRTF list' Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 11 Nov 2013 14:31:13 -0000 > How would you classify BFD running between two devices ? To which plane > in your "very clear" model does it belong ? The control plane --it is a protocol which impacts the information used to actually forward packets. Speed doesn't matter, function does. :-) Russ From russw@riw.us Mon Nov 11 06:33:27 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A6F0421E81E5 for ; Mon, 11 Nov 2013 06:33:27 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.135 X-Spam-Level: X-Spam-Status: No, score=-2.135 tagged_above=-999 required=5 tests=[AWL=0.464, BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id du3c-DxLujdg for ; Mon, 11 Nov 2013 06:33:21 -0800 (PST) Received: from server.riw.us (server.riw.us [162.144.32.236]) by ietfa.amsl.com (Postfix) with ESMTP id 9B95221F9F8F for ; Mon, 11 Nov 2013 06:33:19 -0800 (PST) Received: from cpe-098-122-144-218.nc.res.rr.com ([98.122.144.218]:61927 helo=RussPC) by server.riw.us with esmtpsa (TLSv1:AES128-SHA:128) (Exim 4.80.1) (envelope-from ) id 1VfsYF-0003w8-9K; Mon, 11 Nov 2013 14:33:15 +0000 From: "Russ White" To: "'Pedro Martinez-Julia'" , References: <001301ceded0$ab50b4c0$01f21e40$@riw.us> <4d2ee44e6fcb4dd18a26f8bc33c8abf1@exrad6.ad.rad.co.il> <00d201cedee5$039eaa10$0adbfe30$@riw.us> <20131111141907.GO17999@um.es> In-Reply-To: <20131111141907.GO17999@um.es> Date: Mon, 11 Nov 2013 09:33:15 -0500 Message-ID: <012701cedeea$f5e174b0$e1a45e10$@riw.us> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Outlook 15.0 Thread-Index: AQENI0eiA8rOH7Iq3TRo8LAe8dZyDQFI1QtMAbjUhh0BxvBVogKnk/x4AZ6SrJICDtdm1QI/0JY2mzijszA= Content-Language: en-us X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server.riw.us X-AntiAbuse: Original Domain - irtf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - riw.us X-Get-Message-Sender-Via: server.riw.us: authenticated_id: russw@riw.us X-Source: X-Source-Args: X-Source-Dir: Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 11 Nov 2013 14:33:28 -0000 > This option *must* not be considered. It is really confusing the terms and > may confuse anyone working with them. The notifications originated from a > network device can never be considered part of the data plane and the > functional block that sends it can never be part of the data plane. Hmm... I can see your point. > Again, from my point of view, protocol/function classification is very clear. In > a device centric model: > - Data Plane: Those protocols/functions that forward data from incoming > to outgoing interfaces/ports. > - Control Plane: Those protocols/functions that change the information > used by the protocols/functions of the data plane (forwarding tables) > in order to achieve the objectives or general operation of the device. > - Management Plane: Those protocols/functions used to monitor the status > of a device, set configuration parameters and general policies that > the device must enforce to achieve its objectives (yes, definition of > policies is part of the management plane), etc. These are fine with me --only I'd leave "policy" to a different discussion, just because it's going to need a separate discussion. :-) :-) Russ From rraszuk@gmail.com Mon Nov 11 06:33:56 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C4DFD21F9EAF for ; Mon, 11 Nov 2013 06:33:56 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.497 X-Spam-Level: X-Spam-Status: No, score=-1.497 tagged_above=-999 required=5 tests=[AWL=0.481, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id PFRZhpfLLg5a for ; Mon, 11 Nov 2013 06:33:56 -0800 (PST) Received: from mail-ie0-x234.google.com (mail-ie0-x234.google.com [IPv6:2607:f8b0:4001:c03::234]) by ietfa.amsl.com (Postfix) with ESMTP id 7321521E80D2 for ; Mon, 11 Nov 2013 06:33:46 -0800 (PST) Received: by mail-ie0-f180.google.com with SMTP id e14so7482156iej.25 for ; Mon, 11 Nov 2013 06:33:36 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:date:message-id:subject :from:to:cc:content-type; bh=MP4IW0hPACY3iIVXaOZPmwq2QgpD7gjhTRVAfzeyZU0=; b=E9f0FikqncR+OF53rZ81X9T/suvqwPW9PyLq1xtirN4CYruXG5mVVXSGpezKwKTCPH UFmrjkHoddu0ie0ICu0JvY+j6owm0JMXM/tf9R+zKpsEhe5mxDq8mDJGMY5J2JrqiUY0 bSf+dCasuPmsQ+T3LReB5BvtoIKOZS0bIQFXTB2JkK8JY+W3AsCkPyRSamJOjG4GG0Nw vcKHgVYKuqNqtTx4RNF3oSGdLoqtZRsrL5e1fUO7ScoQTUscCkxVoqnLTGXgUc4RKul9 ldfo2xSwvyfO5Naf/L6t78wbKCgqY1u8fQsZIXQ/Qs/QgS80pAkTSjgz6mlrnFqHSiCV vwew== MIME-Version: 1.0 X-Received: by 10.50.11.67 with SMTP id o3mr12542552igb.55.1384180416084; Mon, 11 Nov 2013 06:33:36 -0800 (PST) Sender: rraszuk@gmail.com Received: by 10.64.61.129 with HTTP; Mon, 11 Nov 2013 06:33:35 -0800 (PST) In-Reply-To: <012601cedeea$a00097b0$e001c710$@riw.us> References: <001301ceded0$ab50b4c0$01f21e40$@riw.us> <4d2ee44e6fcb4dd18a26f8bc33c8abf1@exrad6.ad.rad.co.il> <00d201cedee5$039eaa10$0adbfe30$@riw.us> <20131111141907.GO17999@um.es> <012601cedeea$a00097b0$e001c710$@riw.us> Date: Mon, 11 Nov 2013 15:33:35 +0100 X-Google-Sender-Auth: OXjz2TDimZTGlJIUJ78vw6cHLQI Message-ID: From: Robert Raszuk To: Russ White Content-Type: text/plain; charset=ISO-8859-1 Cc: SDN IRTF list , Pedro Martinez-Julia Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 11 Nov 2013 14:33:56 -0000 Well not according to Pedro ... He says that "Those protocols/functions used to monitor the status of a device" is a mgmt plane :) r. On Mon, Nov 11, 2013 at 3:30 PM, Russ White wrote: > >> How would you classify BFD running between two devices ? To which plane >> in your "very clear" model does it belong ? > > The control plane --it is a protocol which impacts the information used to > actually forward packets. Speed doesn't matter, function does. > > :-) > > Russ > > From pedromj@um.es Mon Nov 11 06:59:22 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0A50B21E8064 for ; Mon, 11 Nov 2013 06:59:21 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -6.599 X-Spam-Level: X-Spam-Status: No, score=-6.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id pRFoIlzPFsTt for ; Mon, 11 Nov 2013 06:59:13 -0800 (PST) Received: from xenon12.um.es (xenon12.um.es [155.54.212.166]) by ietfa.amsl.com (Postfix) with ESMTP id 9476821E81E9 for ; Mon, 11 Nov 2013 06:58:55 -0800 (PST) Received: from localhost (localhost [127.0.0.1]) by xenon12.um.es (Postfix) with ESMTP id C79DD4C52D for ; Mon, 11 Nov 2013 15:58:54 +0100 (CET) X-Virus-Scanned: by antispam in UMU at xenon12.um.es Received: from xenon12.um.es ([127.0.0.1]) by localhost (xenon12.um.es [127.0.0.1]) (amavisd-new, port 10024) with LMTP id zu0hwGN7Sm51 for ; Mon, 11 Nov 2013 15:58:54 +0100 (CET) Received: from localhost (unknown [46.25.162.195]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) (Authenticated sender: pedromj@um.es) by xenon12.um.es (Postfix) with ESMTPSA id 3D9834C4AA for ; Mon, 11 Nov 2013 15:58:53 +0100 (CET) Date: Mon, 11 Nov 2013 15:58:53 +0100 From: Pedro Martinez-Julia To: sdn@irtf.org Message-ID: <20131111145853.GA18189@um.es> References: <001301ceded0$ab50b4c0$01f21e40$@riw.us> <4d2ee44e6fcb4dd18a26f8bc33c8abf1@exrad6.ad.rad.co.il> <00d201cedee5$039eaa10$0adbfe30$@riw.us> <20131111141907.GO17999@um.es> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.22 (2013-10-16) Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 11 Nov 2013 14:59:33 -0000 On Mon, Nov 11, 2013 at 03:28:49PM +0100, Robert Raszuk wrote: > How would you classify BFD running between two devices ? To which > plane in your "very clear" model does it belong ? > For me, th BFD protocol is classified as control plane because it will affect to the forwarding behavior (if BFD is connected to the device forwarding tables). The reason for not being part of the data plane is obvious, it does not forwards packets form other entities. It is not from a management plane because its objective is not to communicate administrative decisions. On the other hand, if BFD is just used to know the health of links, it can effectively be considered part of the management plane. This can be an example of how the same protocol may operate for the control plane or for the management plane, but it does not break the boundaries among the planes, just demonstrates that the classification should be applied to running functions/protocols, not to their architecture. > Best, > r. Regards, Pedro -- Pedro Martinez-Julia Department of Communication and Information Engineering Faculty of Computer Science University of Murcia Email: pedromj@um.es --------------------------------------------------------- *** Entia non sunt multiplicanda praeter necessitatem *** From hadi@mojatatu.com Mon Nov 11 07:01:00 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id DD46421F9E83 for ; Mon, 11 Nov 2013 07:01:00 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.956 X-Spam-Level: X-Spam-Status: No, score=-102.956 tagged_above=-999 required=5 tests=[AWL=0.021, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, RCVD_IN_DNSWL_LOW=-1, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id QTgHbDJIwQox for ; Mon, 11 Nov 2013 07:00:56 -0800 (PST) Received: from mail-ve0-f179.google.com (mail-ve0-f179.google.com [209.85.128.179]) by ietfa.amsl.com (Postfix) with ESMTP id 83FAE21E8064 for ; Mon, 11 Nov 2013 07:00:56 -0800 (PST) Received: by mail-ve0-f179.google.com with SMTP id oz11so2190297veb.24 for ; Mon, 11 Nov 2013 07:00:56 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc:content-type; bh=QRmLxITa/3qva7PirTAPP2rgUQNsZddlbrfojNjk0QU=; b=bhxco0Nxe84mkDlRfzUJm2Ox3eyXcSn0XcV9tB45CTgv0IOErYVLYUst4/e2MGAaWG k0lj9hM+yy1xZMd3d8jbh41v+qNyLERwTg3S2jZ72NbsvjDAOiJxaGXUXjidcWATanTg Rro47fF4PoqK3oSLbOvGYVnjQwOKp/xYvyPs8Zmp9LQ8dVAfaGuoSpqwg9epl0zfDPAf qp1mNfSL3Tlj7DdRb58ErYQdUAANUVcJZsgArHAfoFl+b7nF0NHy99cOip0JBVqsFEDq 4qIzawpoiXKQCS32Q2nQHMKekuVIIrtrz1hcSAmT9Jn8OqysYdBMEHgfAd9ZqTBECSUM GxbQ== X-Gm-Message-State: ALoCoQl7CPbTvbEGU7tHG2NR7KCyDeqXLqq8vYOW6CDJ8ZGsRJgqPYNrT+HkrNgzUPIuPapOd6AJ X-Received: by 10.52.98.99 with SMTP id eh3mr1727147vdb.29.1384182055967; Mon, 11 Nov 2013 07:00:55 -0800 (PST) MIME-Version: 1.0 Received: by 10.58.8.19 with HTTP; Mon, 11 Nov 2013 07:00:35 -0800 (PST) In-Reply-To: <012501cedeea$7f46c120$7dd44360$@riw.us> References: <00dc01cedee6$327f9730$977ec590$@riw.us> <012501cedeea$7f46c120$7dd44360$@riw.us> From: Jamal Hadi Salim Date: Mon, 11 Nov 2013 10:00:35 -0500 Message-ID: To: Russ White Content-Type: text/plain; charset=ISO-8859-1 Cc: David Meyer , Yaakov Stein , "sdn@irtf.org" Subject: Re: [Sdn] Timeliness WAS(Re: Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 11 Nov 2013 15:01:01 -0000 On Mon, Nov 11, 2013 at 9:29 AM, Russ White wrote: > So, should we put absolute times around it then? > > - Data Plane -- timing less than 500ms > - Control Plane --timing greater than 501ms and less than 10 seconds > - Management Plane -- timing greater than 10 seconds > > > Do humans with faster reaction times now count as control planes rather than > management planes? Or are all managers just slower than all "control > humans?" :-) > Picking some handwave numbers maybe sensible. > Sorry, this doesn't work --I don't care what the "historical nature," is... > We don't want a definition that's "historically accurate," or etymologically > correct. We want a definition that will work to build a solid model of > device operation on which we can build a solid model of network and services > operation. > And isnt basing it on today's realities meet sufficiently meet those goals? The interfaces for classical "management" were simply not designed to scale to the latencies and throughput needs of "control". You would have to perform acrobatics to get netconf in all its glory with yang to achieve 100K table updates per second. > Stick with whatever you'd like --but I'm going to continue to argue with > every revision of your doc that your definitions don't reflect a usable > model in the real world. > > What is "brains?" Anything that does processing? And what happens when two > "brains" interact? Is the interaction itself another "resource?" These > definitions are so broad as to say just about anything. > The brain: A human; a clever control plane application; an autonomous system of some form. On resource: I see your point. My view of a resource is something that can be scheduled by some manager aka "brain" above. i.e not trying to go beyond what is defined today. > So a static route entered by an automated process which is faster than a > distributed control plane is not control plane simply because it's > traditionally entered by fingers on a keyboard? >I suppose it all depends on > the typing speed of the person on the keyboard... ?? And setting up the > configuration to export a route from an IGP is somehow faster than > configuring a static route? > I said if it is entered by a CLI, then the sense of urgency is not as much as BGP would have updated the RIB/FIB. This has nothing to do with how fast you can type;-> It is the intent of the interface. If you take that interface and automate it, that still doesnt change its noun. It prefixes it with "automated" > You are trying to define something based on a mixture of requirements and > operations. "This operates that way, so it is x, but the timing of that is > y, so it is y." Precisely - because the doc is trying to provide some taxanomy. It is not intended to be judgemental on why someone automating CLIs is saying they are doing SDN. It is merely stating the differences in the different things called SDN - and latency and throughput are a part of that. >When you encounter overlaps, these definitions aren't going > to work --nor are they useful to describe timing requirements. If I want to > describe a requirement for a management plane operation that executes in > less time than you've allowed, must I now call it a data plane requirement, > no matter where it executes? In other words, "I need to check the cpu > temperature every 200 ms for the next 10 seconds," is now a data plane > requirement simply because it's fast, not because of the operation actually > being performed. > Monitoring the temparature of the CPU is definetely a management activity. Just because cpu i am monitoring sits on a line card is not important. >From a timeliness/throughput lens: I dont expect to be scaling it to 100K times/second. That defeats the intent. > The only way towards clarity is to separate timing --traditional, > historical, modern, or future-- from the operations. Then you can describe > an operation, determine the timing requirements for performing that > operation, and then design a system that reaches those performance > requirements. Simply saying, "this is slower, so it's control plane, and > that's slower still, so it's management plane," won't help with that process > at all. > The important part is what existing interfaces do. If you can tell me that you would automate FIB updates via a CLI when resyncing 500K routes, or use netconf and achieve the same results as using ForCES or whatever proprietary scheme used, then timeliness and throughput are not important. I dont think that is the case. And that was my starting point in this post. cheers, jamal ___________________________________ > sdn mailing list > sdn@irtf.org > https://www.irtf.org/mailman/listinfo/sdn From pedromj@um.es Mon Nov 11 07:03:49 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E264C11E817A for ; Mon, 11 Nov 2013 07:03:49 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -6.599 X-Spam-Level: X-Spam-Status: No, score=-6.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 8wWzNvTgj9Tr for ; Mon, 11 Nov 2013 07:03:44 -0800 (PST) Received: from xenon11.um.es (xenon11.um.es [155.54.212.165]) by ietfa.amsl.com (Postfix) with ESMTP id 5E16211E817E for ; Mon, 11 Nov 2013 07:03:38 -0800 (PST) Received: from localhost (localhost [127.0.0.1]) by xenon11.um.es (Postfix) with ESMTP id E3E775376E for ; Mon, 11 Nov 2013 16:03:36 +0100 (CET) X-Virus-Scanned: by antispam in UMU at xenon11.um.es Received: from xenon11.um.es ([127.0.0.1]) by localhost (xenon11.um.es [127.0.0.1]) (amavisd-new, port 10024) with LMTP id PCH7IrQZa6ZD for ; Mon, 11 Nov 2013 16:03:36 +0100 (CET) Received: from localhost (unknown [46.25.162.195]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) (Authenticated sender: pedromj@um.es) by xenon11.um.es (Postfix) with ESMTPSA id 53CF4537AB for ; Mon, 11 Nov 2013 16:03:36 +0100 (CET) Date: Mon, 11 Nov 2013 16:03:36 +0100 From: Pedro Martinez-Julia To: sdn@irtf.org Message-ID: <20131111150336.GB18189@um.es> References: <001301ceded0$ab50b4c0$01f21e40$@riw.us> <4d2ee44e6fcb4dd18a26f8bc33c8abf1@exrad6.ad.rad.co.il> <00d201cedee5$039eaa10$0adbfe30$@riw.us> <20131111141907.GO17999@um.es> <012601cedeea$a00097b0$e001c710$@riw.us> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.22 (2013-10-16) Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 11 Nov 2013 15:03:50 -0000 On Mon, Nov 11, 2013 at 03:33:35PM +0100, Robert Raszuk wrote: > Well not according to Pedro ... He says that "Those > protocols/functions used to monitor the status of a device" is a mgmt > plane :) > I've answered your previous mail but in this rough definition, "status" means the global status of a device and the objective is important so I can add to the definition that the objective of a function/protocol of the management plane is to support management/administrative decisions. > r. > Regards, Pedro -- Pedro Martinez-Julia Department of Communication and Information Engineering Faculty of Computer Science University of Murcia Email: pedromj@um.es --------------------------------------------------------- *** Entia non sunt multiplicanda praeter necessitatem *** From dmm@1-4-5.net Mon Nov 11 07:51:32 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 24D9811E8218 for ; Mon, 11 Nov 2013 07:51:32 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.977 X-Spam-Level: X-Spam-Status: No, score=-2.977 tagged_above=-999 required=5 tests=[AWL=-0.000, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id WIdyw-XJhg+T for ; Mon, 11 Nov 2013 07:51:27 -0800 (PST) Received: from mail-ob0-f169.google.com (mail-ob0-f169.google.com [209.85.214.169]) by ietfa.amsl.com (Postfix) with ESMTP id E053711E823B for ; Mon, 11 Nov 2013 07:50:49 -0800 (PST) Received: by mail-ob0-f169.google.com with SMTP id wn1so3957962obc.28 for ; Mon, 11 Nov 2013 07:50:46 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type; bh=8Se+m3bjeSDzEguGBZsn6N0iTiDG3DnBGXQMc7Bj0ZA=; b=Zt+ez5R3fe+WwL0YUXXxuvberYEYM60/T31fG2OyKccbI/WUqEXwf4Anx6VVPW1KCb GzUxsEvBybQrYLsdTLPdMopUI9G49T7y227VuOJfMfaFyDQLbq2anWrM0jt8sj2adsxU Wym80dX269qpjdZITSZeaIFM4Gggo3g2r29xiJT7fQWc1cwNS8Ir6n1WEQn05QBdOrkx ba1mccWWH+c09ge4iY4e+f5TfD7FRe0TgLRHZWb5uXDTudfqzzw4MkdDzUT2GUlVAfSP gOWV3qswWa2t/BGTpqTlDb4AblyeeZyWuc4flayW6a5HMyOBSj3NOqqx47mLOYMWOdGh +JEQ== X-Gm-Message-State: ALoCoQn6I4LBA1gfmCW8upvkU9JEwvUtSQkYbXKfnLBZ9q2vGYV+y1lMwVeTw+DbHZC5RvPEve1J MIME-Version: 1.0 X-Received: by 10.182.80.196 with SMTP id t4mr25932271obx.1.1384185046367; Mon, 11 Nov 2013 07:50:46 -0800 (PST) Received: by 10.182.66.168 with HTTP; Mon, 11 Nov 2013 07:50:46 -0800 (PST) X-Originating-IP: [2001:468:d01:9c:a07b:e96c:646e:83a0] In-Reply-To: <012501cedeea$7f46c120$7dd44360$@riw.us> References: <00dc01cedee6$327f9730$977ec590$@riw.us> <012501cedeea$7f46c120$7dd44360$@riw.us> Date: Mon, 11 Nov 2013 07:50:46 -0800 Message-ID: From: David Meyer To: Russ White Content-Type: text/plain; charset=ISO-8859-1 Cc: Yaakov Stein , SDN IRTF list , Jamal Hadi Salim Subject: Re: [Sdn] Timeliness WAS(Re: Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 11 Nov 2013 15:51:32 -0000 -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On Mon, Nov 11, 2013 at 6:29 AM, Russ White <russw@riw.us> wrote:>>> > If you define the management plane as "those things which interact>> > with the device on which the control plane and data planes run, and>> > those things that interact with the way the control plane operates,">> > (in other words, what doesn't fit into the control or data planes fits>> > into the management plane), then you can quickly see there should be>> > absolutely no assumption about timing and speed of operation between>> the three.>>>> > When you define management plane as, "those things which interact with>> > humans," you imply timing -- and hence either are forced to consider>> > virtually everything that's automated part of the control plane>> > (including checking the temperature of the processors on the box, or>> > the speed of a hard drive spin, etc.), simply because it's automated.>> > In this case, a bad definition drives us to muddling two different>> > sets of functionality into one "thing," which makes it much harder to>> > think through the problem of centralized verses distributed control>> > planes, what's needed where, etc. (a distributed protocol to carry the>> > cpu temp to all devices in the network, anyone??).>>>> Timing is relevant IMO for the historical nature around it. Yaakov aptly>> pointed out the human loop. Protocols and interfaces that are today>> automated were designed with a human loop in mind. Usability for example>> is an important factor.>> So, should we put absolute times around it then?>> - Data Plane -- timing less than 500ms> - Control Plane --timing greater than 501ms and less than 10 seconds> - Management Plane -- timing greater than 10 secondsIMO this is almost certainly the wrong approach, as whatever times you decide to use will adjust to technology over time. That is, the time required by whatever operations is not an architectural feature; rather these are artifacts of current technology and approaches.>> Do humans with faster reaction times now count as control planes rather than> management planes? Or are all managers just slower than all "control> humans?" :-)>> Sorry, this doesn't work - --I don't care what the "historical nature," is...> We don't want a definition that's "historically accurate," or etymologically> correct. We want a definition that will work to build a solid model of> device operation on which we can build a solid model of network and services> operation.History is a good thing to understand, but I agree we need extensible notions (I hesitate to use the word "models") of current and if possible future usage.>>> We are sticking to the term "resources" in our doc for "things that you>> interact with" - regardless of where they sit. Someone/thing that has> brains>> either controls or manages those "things".>> Stick with whatever you'd like - --but I'm going to continue to argue with> every revision of your doc that your definitions don't reflect a usable> model in the real world.I've kinda lost which document you're talking about here.>> What is "brains?" Anything that does processing? And what happens when two> "brains" interact? Is the interaction itself another "resource?" These> definitions are so broad as to say just about anything.>>> Your response that entering a static route makes it a control plane> activity i>> think needs to be qualified. If i enter a static route from a CLI - that> is a>> management activity because the timeliness is not as important as if i>> exported the same route from an IGP.>> So a static route entered by an automated process which is faster than a> distributed control plane is not control plane simply because it's> traditionally entered by fingers on a keyboard? I suppose it all depends on> the typing speed of the person on the keyboard... ?? And setting up the> configuration to export a route from an IGP is somehow faster than> configuring a static route?>> So, IMO - automation does not qualify something as "control"; the> interfaces>> are not ready for it and timeliness is a factor.>> You are trying to define something based on a mixture of requirements and> operations. "This operates that way, so it is x, but the timing of that is> y, so it is y." When you encounter overlaps, these definitions aren't going> to work --nor are they useful to describe timing requirements. If I want to> describe a requirement for a management plane operation that executes in> less time than you've allowed, must I now call it a data plane requirement,> no matter where it executes? In other words, "I need to check the cpu> temperature every 200 ms for the next 10 seconds," is now a data plane> requirement simply because it's fast, not because of the operation actually> being performed.>> The only way towards clarity is to separate timing --traditional,> historical, modern, or future-- from the operations. Then you can describe> an ogooleperation, determine the timing requirements for performing that> operation, and then design a system that reaches those performance> requirements. Simply saying, "this is slower, so it's control plane, and> that's slower still, so it's management plane," won't help with that process> at all.Agreed. In addition, if we really want to model this we'll need to understand the "separation of timescales" (a key idea in the study of complex systems, see e.g., [0], anything dealing with the architecture of transcription networks, or google). I'm not sure we want to go to this level of description here, but if you open that can of worms...--dmm[0] http://cmg.soton.ac.uk/research/projects/separation-of-timescales-in-models-of-complex-networks/>> :-)>> Russ> -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.15 (GNU/Linux) iEYEARECAAYFAlKA/NYACgkQORgD1qCZ2KepXwCeOduOYFCr01fn5JBmpwmnWI3S Y50AnjzhbBEzfVlnmRmUS30IiaGH90ds =yAiG -----END PGP SIGNATURE----- From k.pentikousis@eict.de Mon Nov 11 08:07:37 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C7A7F21F9D87 for ; Mon, 11 Nov 2013 08:07:35 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.089 X-Spam-Level: X-Spam-Status: No, score=-2.089 tagged_above=-999 required=5 tests=[AWL=0.160, BAYES_00=-2.599, HELO_EQ_DE=0.35] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id sd-B3XIbcnDj for ; Mon, 11 Nov 2013 08:07:24 -0800 (PST) Received: from mx2.eict.de (mx2.eict.de [212.91.241.168]) by ietfa.amsl.com (Postfix) with ESMTP id D057E21E80B3 for ; Mon, 11 Nov 2013 08:07:23 -0800 (PST) Received: from mail.eict.de (mx1 [172.16.6.1]) by mx2.eict.de (Postfix) with ESMTP id D5FD41FF3F; Mon, 11 Nov 2013 17:07:22 +0100 (CET) Received: from sbs2008.eict.local (sbs2008.intern.eict.de [192.168.2.11]) by mail.eict.de (Postfix) with ESMTP id 82AC2378232; Mon, 11 Nov 2013 17:07:22 +0100 (CET) Received: from SBS2008.eict.local ([fe80::2051:ef24:c7c9:f298]) by SBS2008.eict.local ([fe80::2051:ef24:c7c9:f298%13]) with mapi; Mon, 11 Nov 2013 17:07:22 +0100 From: Konstantinos Pentikousis To: Russ White , 'Jamal Hadi Salim' Date: Mon, 11 Nov 2013 17:07:21 +0100 Thread-Topic: [Sdn] Timeliness WAS(Re: Thoughts on Defining control and Management Planes Thread-Index: Ac7e6o7T5w05h5U+Rw+jj6NMrlWpWQAClN5A Message-ID: <0C7EDCF89AB9E2478B5D010026CFF4AEA10C129C05@SBS2008.eict.local> References: <00dc01cedee6$327f9730$977ec590$@riw.us> <012501cedeea$7f46c120$7dd44360$@riw.us> In-Reply-To: <012501cedeea$7f46c120$7dd44360$@riw.us> Accept-Language: en-US, de-DE Content-Language: de-DE X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US, de-DE Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Cc: 'David Meyer' , 'Yaakov Stein' , "sdn@irtf.org" Subject: Re: [Sdn] Timeliness WAS(Re: Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 11 Nov 2013 16:07:37 -0000 | Stick with whatever you'd like --but I'm going to continue to argue | with every revision of your doc that your definitions don't reflect a | usable model in the real world. Should I read this as "no matter what is the (future/revised) text, we will= have an argument"? Maybe I misunderstood, but that doesn't sound too open-= minded, let alone suitable for a research group discussion. In fact, such k= ind of "argumentation" should convince even the most stern opponents of dra= ft-haleplidis-sdnrg-layer-terminology of the need for a such a draft. Perhaps you would be interested in proposing some text in the grand old IET= F tradition: OLD: ... NEW: ... Then we could be more concrete instead of arguing about which part of the t= ext we do not agree upon today--and we will continue to do so till kingdom = comes. Many thanks, Kostas From yaakov_s@rad.com Mon Nov 11 09:43:36 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3BE5421E80A5 for ; Mon, 11 Nov 2013 09:43:36 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.536 X-Spam-Level: X-Spam-Status: No, score=-102.536 tagged_above=-999 required=5 tests=[AWL=0.062, BAYES_00=-2.599, UNPARSEABLE_RELAY=0.001, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id CSd2O7ofj5eo for ; Mon, 11 Nov 2013 09:43:32 -0800 (PST) Received: from rad.co.il (mailrelay02-q.rad.co.il [94.188.133.159]) by ietfa.amsl.com (Postfix) with ESMTP id 5D93A21E8203 for ; Mon, 11 Nov 2013 09:43:29 -0800 (PST) Received: from Internal Mail-Server by MailRelay02 (envelope-from yaakov?s@rad.com) with RC4-SHA encrypted SMTP; 11 Nov 2013 19:43:27 +0200 Received: from EXRAD6.ad.rad.co.il (2002:c072:18be::c072:18be) by exrad6.ad.rad.co.il (2002:c072:18be::c072:18be) with Microsoft SMTP Server (TLS) id 15.0.712.24; Mon, 11 Nov 2013 19:43:26 +0200 Received: from EXRAD6.ad.rad.co.il ([fe80::95ed:2d3a:ffd9:390a]) by exrad6.ad.rad.co.il ([fe80::95ed:2d3a:ffd9:390a%20]) with mapi id 15.00.0712.012; Mon, 11 Nov 2013 19:43:26 +0200 From: Yaakov Stein To: Russ White , 'Robert Raszuk' , "'Pedro Martinez-Julia'" Thread-Topic: [Sdn] Thoughts on Defining control and Management Planes Thread-Index: AQHO2xqln5belLyQLUuIkuyZNXbJhJoZGb3QgAC95ACABeaIIIAAC20AgAAwjYD///glgIAAB/KAgAACtoCAAACRgIAAVwZA Date: Mon, 11 Nov 2013 17:43:26 +0000 Message-ID: <114475f8112547b2bab678eca08278cb@exrad6.ad.rad.co.il> References: <001301ceded0$ab50b4c0$01f21e40$@riw.us> <4d2ee44e6fcb4dd18a26f8bc33c8abf1@exrad6.ad.rad.co.il> <00d201cedee5$039eaa10$0adbfe30$@riw.us> <20131111141907.GO17999@um.es> <012601cedeea$a00097b0$e001c710$@riw.us> In-Reply-To: <012601cedeea$a00097b0$e001c710$@riw.us> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [2002:c073:f33e::c073:f33e] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Commtouch-Refid: str=0001.0A090203.5281173F.010E, ss=1, re=0.100, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0 (Unknown) Cc: 'SDN IRTF list' Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 11 Nov 2013 17:43:36 -0000 No, BFD is data plane. Control plane protocols can be sent out-of-band; would out-of-band BFD mean anything ? Y(J)S -----Original Message----- From: sdn-bounces@irtf.org [mailto:sdn-bounces@irtf.org] On Behalf Of Russ = White Sent: 11 November, 2013 16:31 To: 'Robert Raszuk'; 'Pedro Martinez-Julia' Cc: 'SDN IRTF list' Subject: Re: [Sdn] Thoughts on Defining control and Management Planes > How would you classify BFD running between two devices ? To which=20 > plane in your "very clear" model does it belong ? The control plane --it is a protocol which impacts the information used to = actually forward packets. Speed doesn't matter, function does. :-) Russ _______________________________________________ sdn mailing list sdn@irtf.org https://www.irtf.org/mailman/listinfo/sdn From yaakov_s@rad.com Mon Nov 11 09:49:22 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 24BF911E81B8 for ; Mon, 11 Nov 2013 09:49:22 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.546 X-Spam-Level: X-Spam-Status: No, score=-102.546 tagged_above=-999 required=5 tests=[AWL=0.052, BAYES_00=-2.599, UNPARSEABLE_RELAY=0.001, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id FCsLhB3wf0iG for ; Mon, 11 Nov 2013 09:49:17 -0800 (PST) Received: from rad.co.il (mailrelay02-q.rad.co.il [94.188.133.159]) by ietfa.amsl.com (Postfix) with ESMTP id 886E421E8248 for ; Mon, 11 Nov 2013 09:48:41 -0800 (PST) Received: from Internal Mail-Server by MailRelay02 (envelope-from yaakov?s@rad.com) with RC4-SHA encrypted SMTP; 11 Nov 2013 19:48:38 +0200 Received: from EXRAD6.ad.rad.co.il (2002:c072:18be::c072:18be) by exrad6.ad.rad.co.il (2002:c072:18be::c072:18be) with Microsoft SMTP Server (TLS) id 15.0.712.24; Mon, 11 Nov 2013 19:48:31 +0200 Received: from EXRAD6.ad.rad.co.il ([fe80::95ed:2d3a:ffd9:390a]) by exrad6.ad.rad.co.il ([fe80::95ed:2d3a:ffd9:390a%20]) with mapi id 15.00.0712.012; Mon, 11 Nov 2013 19:48:31 +0200 From: Yaakov Stein To: Russ White , 'Jamal Hadi Salim' Thread-Topic: Timeliness WAS(Re: [Sdn] Thoughts on Defining control and Management Planes Thread-Index: AQHO3uPO4a2lYVo10UydL8SueR9Md5of7ROAgAAFFICAAAOGAIAAWCeg Date: Mon, 11 Nov 2013 17:48:31 +0000 Message-ID: <2329b8e07d8444a2808de812c4ea0e2a@exrad6.ad.rad.co.il> References: <00dc01cedee6$327f9730$977ec590$@riw.us> <012501cedeea$7f46c120$7dd44360$@riw.us> In-Reply-To: <012501cedeea$7f46c120$7dd44360$@riw.us> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [2002:c073:f33e::c073:f33e] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Commtouch-Refid: str=0001.0A090209.52811876.0060, ss=1, re=0.100, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0 (Unknown) Cc: 'David Meyer' , "sdn@irtf.org" Subject: Re: [Sdn] Timeliness WAS(Re: Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 11 Nov 2013 17:49:22 -0000 No, we needn't put absolute times. The times of importance are those that would signify unavailability for the= particular application. Thus for interactive applications the times would be shorter than for progr= essive download ones. In the old days when voice was the only application, 100 ms was the gold st= andard, and so protection switching was required to be mo more than 50 ms. Y(J)S -----Original Message----- From: Russ White [mailto:russw@riw.us]=20 Sent: 11 November, 2013 16:30 To: 'Jamal Hadi Salim' Cc: 'David Meyer'; Yaakov Stein; sdn@irtf.org Subject: RE: Timeliness WAS(Re: [Sdn] Thoughts on Defining control and Mana= gement Planes > > If you define the management plane as "those things which interact=20 > > with the device on which the control plane and data planes run, and=20 > > those things that interact with the way the control plane operates," > > (in other words, what doesn't fit into the control or data planes=20 > > fits into the management plane), then you can quickly see there=20 > > should be absolutely no assumption about timing and speed of=20 > > operation between > the three. >=20 > > When you define management plane as, "those things which interact=20 > > with humans," you imply timing -- and hence either are forced to=20 > > consider virtually everything that's automated part of the control=20 > > plane (including checking the temperature of the processors on the=20 > > box, or the speed of a hard drive spin, etc.), simply because it's auto= mated. > > In this case, a bad definition drives us to muddling two different=20 > > sets of functionality into one "thing," which makes it much harder=20 > > to think through the problem of centralized verses distributed=20 > > control planes, what's needed where, etc. (a distributed protocol to=20 > > carry the cpu temp to all devices in the network, anyone??). >=20 > Timing is relevant IMO for the historical nature around it. Yaakov=20 > aptly pointed out the human loop. Protocols and interfaces that are=20 > today automated were designed with a human loop in mind. Usability for=20 > example is an important factor. So, should we put absolute times around it then? - Data Plane -- timing less than 500ms - Control Plane --timing greater than 501ms and less than 10 seconds - Management Plane -- timing greater than 10 seconds Do humans with faster reaction times now count as control planes rather tha= n management planes? Or are all managers just slower than all "control huma= ns?" :-) Sorry, this doesn't work --I don't care what the "historical nature," is... We don't want a definition that's "historically accurate," or etymologicall= y correct. We want a definition that will work to build a solid model of de= vice operation on which we can build a solid model of network and services = operation. > We are sticking to the term "resources" in our doc for "things that=20 > you interact with" - regardless of where they sit. Someone/thing that=20 > has brains > either controls or manages those "things". Stick with whatever you'd like --but I'm going to continue to argue with ev= ery revision of your doc that your definitions don't reflect a usable model= in the real world. What is "brains?" Anything that does processing? And what happens when two = "brains" interact? Is the interaction itself another "resource?" These defi= nitions are so broad as to say just about anything. > Your response that entering a static route makes it a control plane activity i > think needs to be qualified. If i enter a static route from a CLI -=20 > that is a > management activity because the timeliness is not as important as if i=20 > exported the same route from an IGP. So a static route entered by an automated process which is faster than a di= stributed control plane is not control plane simply because it's traditiona= lly entered by fingers on a keyboard? I suppose it all depends on the typin= g speed of the person on the keyboard... ?? And setting up the configuratio= n to export a route from an IGP is somehow faster than configuring a static= route? > So, IMO - automation does not qualify something as "control"; the interfaces > are not ready for it and timeliness is a factor. You are trying to define something based on a mixture of requirements and o= perations. "This operates that way, so it is x, but the timing of that is y= , so it is y." When you encounter overlaps, these definitions aren't going = to work --nor are they useful to describe timing requirements. If I want to= describe a requirement for a management plane operation that executes in l= ess time than you've allowed, must I now call it a data plane requirement, = no matter where it executes? In other words, "I need to check the cpu tempe= rature every 200 ms for the next 10 seconds," is now a data plane requireme= nt simply because it's fast, not because of the operation actually being pe= rformed. The only way towards clarity is to separate timing --traditional, historica= l, modern, or future-- from the operations. Then you can describe an operat= ion, determine the timing requirements for performing that operation, and t= hen design a system that reaches those performance requirements. Simply say= ing, "this is slower, so it's control plane, and that's slower still, so it= 's management plane," won't help with that process at all. :-) Russ=20 From pedromj@um.es Mon Nov 11 10:06:42 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6311E11E8229 for ; Mon, 11 Nov 2013 10:06:42 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -6.037 X-Spam-Level: X-Spam-Status: No, score=-6.037 tagged_above=-999 required=5 tests=[AWL=0.562, BAYES_00=-2.599, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 4d4Zjr7OEOG2 for ; Mon, 11 Nov 2013 10:06:36 -0800 (PST) Received: from xenon11.um.es (xenon11.um.es [155.54.212.165]) by ietfa.amsl.com (Postfix) with ESMTP id D5EA011E821C for ; Mon, 11 Nov 2013 10:06:35 -0800 (PST) Received: from localhost (localhost [127.0.0.1]) by xenon11.um.es (Postfix) with ESMTP id A634F53A4B for ; Mon, 11 Nov 2013 19:06:34 +0100 (CET) X-Virus-Scanned: by antispam in UMU at xenon11.um.es Received: from xenon11.um.es ([127.0.0.1]) by localhost (xenon11.um.es [127.0.0.1]) (amavisd-new, port 10024) with LMTP id JpSC5V6K3DOg for ; Mon, 11 Nov 2013 19:06:34 +0100 (CET) Received: from localhost (1.Red-88-25-205.staticIP.rima-tde.net [88.25.205.1]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) (Authenticated sender: pedromj@um.es) by xenon11.um.es (Postfix) with ESMTPSA id 2219253A3A for ; Mon, 11 Nov 2013 19:06:33 +0100 (CET) Date: Mon, 11 Nov 2013 19:06:33 +0100 From: Pedro Martinez-Julia To: sdn@irtf.org Message-ID: <20131111180633.GD18189@um.es> References: <001301ceded0$ab50b4c0$01f21e40$@riw.us> <4d2ee44e6fcb4dd18a26f8bc33c8abf1@exrad6.ad.rad.co.il> <00d201cedee5$039eaa10$0adbfe30$@riw.us> <20131111141907.GO17999@um.es> <012601cedeea$a00097b0$e001c710$@riw.us> <114475f8112547b2bab678eca08278cb@exrad6.ad.rad.co.il> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <114475f8112547b2bab678eca08278cb@exrad6.ad.rad.co.il> User-Agent: Mutt/1.5.22 (2013-10-16) Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 11 Nov 2013 18:06:42 -0000 On Mon, Nov 11, 2013 at 05:43:26PM +0000, Yaakov Stein wrote: > No, BFD is data plane. > > Control plane protocols can be sent out-of-band; > would out-of-band BFD mean anything ? > It would but you cannot achieve the objective without actually crossing the link you are testing. However, it is still control plane because the objective is the control, not to forward data. Remember that packet content in data plane does mean nothing to intermediate devices, just to the source and destination. > > Y(J)S > Regards, Pedro -- Pedro Martinez-Julia Department of Communication and Information Engineering Faculty of Computer Science University of Murcia Email: pedromj@um.es --------------------------------------------------------- *** Entia non sunt multiplicanda praeter necessitatem *** From rraszuk@gmail.com Mon Nov 11 10:53:40 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id ABCF521E8220 for ; Mon, 11 Nov 2013 10:53:40 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.508 X-Spam-Level: X-Spam-Status: No, score=-1.508 tagged_above=-999 required=5 tests=[AWL=0.470, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id LmMaz4oH6kpr for ; Mon, 11 Nov 2013 10:53:40 -0800 (PST) Received: from mail-ie0-x234.google.com (mail-ie0-x234.google.com [IPv6:2607:f8b0:4001:c03::234]) by ietfa.amsl.com (Postfix) with ESMTP id 51A4D11E8165 for ; Mon, 11 Nov 2013 10:53:36 -0800 (PST) Received: by mail-ie0-f180.google.com with SMTP id qd12so207579ieb.25 for ; Mon, 11 Nov 2013 10:53:36 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:date:message-id:subject :from:to:cc:content-type; bh=TUw2pivJrfmrz59gMZrR0qNtJw1kT3uq+rU+PeMgXZs=; b=FpczeMrW53ida0TIh109ditEsQyxY/11VOIWDwXwy/voC4n9rd6bwSprqLU6FYy4IX YSmzc3vZb9UZgPh+/GYI+m5Z3wNXszj/SPECWvuh5l9nc55viODl+ePksczXBS9cgBpA RdtreYL+OdEsi37N5Q7Km0n0R/db2PzMyswkA0o00qz1cRq2dEw7al0I/mblHa2VH8P2 uQt+T71Ks+xsVMonCqxNdBKsrrnj80V5T6j8BTNM0ASJPvpr4wD8HLfvqzcK8deAyZLd YdfGnjkAz7qPdMqd4/S3//LbcyqwM+b0NDkO64F2LWJaV6adZ2wtKq0/llfRYsSCrSmc JMlA== MIME-Version: 1.0 X-Received: by 10.50.164.130 with SMTP id yq2mr13222664igb.53.1384196015973; Mon, 11 Nov 2013 10:53:35 -0800 (PST) Sender: rraszuk@gmail.com Received: by 10.64.61.129 with HTTP; Mon, 11 Nov 2013 10:53:35 -0800 (PST) In-Reply-To: <114475f8112547b2bab678eca08278cb@exrad6.ad.rad.co.il> References: <001301ceded0$ab50b4c0$01f21e40$@riw.us> <4d2ee44e6fcb4dd18a26f8bc33c8abf1@exrad6.ad.rad.co.il> <00d201cedee5$039eaa10$0adbfe30$@riw.us> <20131111141907.GO17999@um.es> <012601cedeea$a00097b0$e001c710$@riw.us> <114475f8112547b2bab678eca08278cb@exrad6.ad.rad.co.il> Date: Mon, 11 Nov 2013 19:53:35 +0100 X-Google-Sender-Auth: flRDzu2qncwqUbfejJw2sjFAIQk Message-ID: From: Robert Raszuk To: Yaakov Stein Content-Type: text/plain; charset=ISO-8859-1 Cc: Russ White , SDN IRTF list , Pedro Martinez-Julia Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 11 Nov 2013 18:53:40 -0000 Indeed - I am with Yaakov here - for me BFD is also much closer to data plane then any other plane. It can run in hardware on a line cards too never even touching local or remote RP/RE where control plane resides. Likewise an interesting question could be to asked about soft-state RSVP-TE ... most will say ohhh for sure control plane .. but TE-LSP is effectively a link and link or node is really a transport for packets. So data plane is not just programming routes or flow-mods to FIB. It is also hardware as well as software which builds data plane. Same for software on the line cards .. for example FIB construction there it has really nothing to do with control plane at all. --- Actually I am not sure why we need this "plane" classification. "planes" can be drawn where we have full system - again starting from what do you want to accomplish - what service(es) you are to run. Arguing for definition of planes now seems to me pretty pointless :-) r. On Mon, Nov 11, 2013 at 6:43 PM, Yaakov Stein wrote: > No, BFD is data plane. > > Control plane protocols can be sent out-of-band; > would out-of-band BFD mean anything ? > > > > Y(J)S > > > -----Original Message----- > From: sdn-bounces@irtf.org [mailto:sdn-bounces@irtf.org] On Behalf Of Russ White > Sent: 11 November, 2013 16:31 > To: 'Robert Raszuk'; 'Pedro Martinez-Julia' > Cc: 'SDN IRTF list' > Subject: Re: [Sdn] Thoughts on Defining control and Management Planes > > >> How would you classify BFD running between two devices ? To which >> plane in your "very clear" model does it belong ? > > The control plane --it is a protocol which impacts the information used to actually forward packets. Speed doesn't matter, function does. > > :-) > > Russ > > > _______________________________________________ > sdn mailing list > sdn@irtf.org > https://www.irtf.org/mailman/listinfo/sdn From pedromj@um.es Mon Nov 11 11:08:51 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5FEFD21E80DC for ; Mon, 11 Nov 2013 11:08:51 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.599 X-Spam-Level: X-Spam-Status: No, score=-4.599 tagged_above=-999 required=5 tests=[AWL=-1.000, BAYES_00=-2.599, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id XOY7ezr5C4By for ; Mon, 11 Nov 2013 11:08:44 -0800 (PST) Received: from xenon13.um.es (xenon13.um.es [155.54.212.167]) by ietfa.amsl.com (Postfix) with ESMTP id 0174311E80E6 for ; Mon, 11 Nov 2013 11:08:44 -0800 (PST) Received: from localhost (localhost [127.0.0.1]) by xenon13.um.es (Postfix) with ESMTP id 53F4A5D70D for ; Mon, 11 Nov 2013 20:06:53 +0100 (CET) X-Virus-Scanned: by antispam in UMU at xenon13.um.es Received: from xenon13.um.es ([127.0.0.1]) by localhost (xenon13.um.es [127.0.0.1]) (amavisd-new, port 10024) with LMTP id hHa7KGSC7w21 for ; Mon, 11 Nov 2013 20:06:53 +0100 (CET) Received: from localhost (1.Red-88-25-205.staticIP.rima-tde.net [88.25.205.1]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) (Authenticated sender: pedromj@um.es) by xenon13.um.es (Postfix) with ESMTPSA id 715625D6FB for ; Mon, 11 Nov 2013 20:06:52 +0100 (CET) Date: Mon, 11 Nov 2013 20:06:52 +0100 From: Pedro Martinez-Julia To: sdn@irtf.org Message-ID: <20131111190652.GE18189@um.es> References: <001301ceded0$ab50b4c0$01f21e40$@riw.us> <4d2ee44e6fcb4dd18a26f8bc33c8abf1@exrad6.ad.rad.co.il> <00d201cedee5$039eaa10$0adbfe30$@riw.us> <20131111141907.GO17999@um.es> <012601cedeea$a00097b0$e001c710$@riw.us> <114475f8112547b2bab678eca08278cb@exrad6.ad.rad.co.il> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.22 (2013-10-16) Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 11 Nov 2013 19:08:51 -0000 On Mon, Nov 11, 2013 at 07:53:35PM +0100, Robert Raszuk wrote: > Indeed - I am with Yaakov here - for me BFD is also much closer to > data plane then any other plane. It can run in hardware on a line > cards too never even touching local or remote RP/RE where control > plane resides. > > Likewise an interesting question could be to asked about soft-state > RSVP-TE ... most will say ohhh for sure control plane .. but TE-LSP is > effectively a link and link or node is really a transport for packets. > > So data plane is not just programming routes or flow-mods to FIB. It > is also hardware as well as software which builds data plane. > > Same for software on the line cards .. for example FIB construction > there it has really nothing to do with control plane at all. > I think you are attributing so much to data plane. Data plane should just have functions that do not analyze the content of packets, i.e. functions that just decide to forward (or not) a packet and to which port it should be forwarded. > --- > > Actually I am not sure why we need this "plane" classification. > "planes" can be drawn where we have full system - again starting from > what do you want to accomplish - what service(es) you are to run. > Arguing for definition of planes now seems to me pretty pointless :-) > The only interest in classification is to have a clear boundary to place functionality. Modularization and loose-coupling are key principles that need such classification to be verified. > r. Regards, Pedro -- Pedro Martinez-Julia Department of Communication and Information Engineering Faculty of Computer Science University of Murcia Email: pedromj@um.es --------------------------------------------------------- *** Entia non sunt multiplicanda praeter necessitatem *** From rraszuk@gmail.com Mon Nov 11 11:18:30 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id DFCF711E8235 for ; Mon, 11 Nov 2013 11:18:30 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.518 X-Spam-Level: X-Spam-Status: No, score=-1.518 tagged_above=-999 required=5 tests=[AWL=0.460, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id VMX81k3Uk7Bw for ; Mon, 11 Nov 2013 11:18:30 -0800 (PST) Received: from mail-ie0-x231.google.com (mail-ie0-x231.google.com [IPv6:2607:f8b0:4001:c03::231]) by ietfa.amsl.com (Postfix) with ESMTP id 780C611E8234 for ; Mon, 11 Nov 2013 11:18:30 -0800 (PST) Received: by mail-ie0-f177.google.com with SMTP id qd12so247269ieb.8 for ; Mon, 11 Nov 2013 11:18:29 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:date:message-id:subject :from:to:cc:content-type; bh=VDAH7ambAkmoYJBRNQJbv+F4xBo4PRGzafoys4ryPUE=; b=0J+xTBwAV7vKZyBbYCzuaOftqz80IVs/WgK9G3Q5/gVi+jRQ2nDMwQ2/DEzedIq2PM 5F3+IAxngfdCUIhE7IokOaniH9lKI4eE8vM0TaEsMaoVt7jnaas2zIOd3468AJp+jGKp kCf5dS6jhSfIsctqcZpzSs2CfvZ4Y65Gf/3/MyTb5BVl++BLmmCaFJD/rKfcYPYLeK0q cB6FCcbccyySW2Imb3uCIG/l3ZEUQUIqxop7ZX69rd/9TZ2Kbq4/oVqKa755zQGr+E8b aeua5+IuMv/GLbMAam8ynAPH+Ur6ZqH0JgBxUQQlPZ9xMuzn/gVThRN1S5KM/GgPNgcI TJPg== MIME-Version: 1.0 X-Received: by 10.50.111.74 with SMTP id ig10mr11445676igb.56.1384197509717; Mon, 11 Nov 2013 11:18:29 -0800 (PST) Sender: rraszuk@gmail.com Received: by 10.64.61.129 with HTTP; Mon, 11 Nov 2013 11:18:29 -0800 (PST) In-Reply-To: <20131111190652.GE18189@um.es> References: <001301ceded0$ab50b4c0$01f21e40$@riw.us> <4d2ee44e6fcb4dd18a26f8bc33c8abf1@exrad6.ad.rad.co.il> <00d201cedee5$039eaa10$0adbfe30$@riw.us> <20131111141907.GO17999@um.es> <012601cedeea$a00097b0$e001c710$@riw.us> <114475f8112547b2bab678eca08278cb@exrad6.ad.rad.co.il> <20131111190652.GE18189@um.es> Date: Mon, 11 Nov 2013 20:18:29 +0100 X-Google-Sender-Auth: o5wCBZgT7Nu58pWoD9zhOxBeDdo Message-ID: From: Robert Raszuk To: Pedro Martinez-Julia Content-Type: text/plain; charset=ISO-8859-1 Cc: SDN IRTF list Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 11 Nov 2013 19:18:31 -0000 Hi Pedro, > I think you are attributing so much to data plane. Data plane should > just have functions that do not analyze the content of packets, i.e. > functions that just decide to forward (or not) a packet and to which > port it should be forwarded. I think you on the other hand vastly underestimate it. Decision on where to forward the packet, how to decapsulate and encapsulate it, decision about ECMP forwarding using physical and virtual links, building FIB hierarchy all require sometimes complex and time optimized code as well as do need deep analysis of the content of the packet. What you sort of describe is of 1.0 definition ... and that's why its of little use for practical applications. Best, R. From pedromj@um.es Mon Nov 11 11:24:52 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id BCAE021E80E5 for ; Mon, 11 Nov 2013 11:24:52 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -5.999 X-Spam-Level: X-Spam-Status: No, score=-5.999 tagged_above=-999 required=5 tests=[AWL=0.600, BAYES_00=-2.599, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id PuchHGHyOTgV for ; Mon, 11 Nov 2013 11:24:47 -0800 (PST) Received: from xenon14.um.es (xenon14.um.es [155.54.212.168]) by ietfa.amsl.com (Postfix) with ESMTP id BBC6621E80E1 for ; Mon, 11 Nov 2013 11:24:46 -0800 (PST) Received: from localhost (localhost [127.0.0.1]) by xenon14.um.es (Postfix) with ESMTP id 6A35C5D5B7 for ; Mon, 11 Nov 2013 20:24:45 +0100 (CET) X-Virus-Scanned: by antispam in UMU at xenon14.um.es Received: from xenon14.um.es ([127.0.0.1]) by localhost (xenon14.um.es [127.0.0.1]) (amavisd-new, port 10024) with LMTP id bJqFWtDERZHL for ; Mon, 11 Nov 2013 20:24:45 +0100 (CET) Received: from localhost (1.Red-88-25-205.staticIP.rima-tde.net [88.25.205.1]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) (Authenticated sender: pedromj@um.es) by xenon14.um.es (Postfix) with ESMTPSA id C7D285D4FB for ; Mon, 11 Nov 2013 20:24:44 +0100 (CET) Date: Mon, 11 Nov 2013 20:24:43 +0100 From: Pedro Martinez-Julia To: sdn@irtf.org Message-ID: <20131111192443.GF18189@um.es> References: <001301ceded0$ab50b4c0$01f21e40$@riw.us> <4d2ee44e6fcb4dd18a26f8bc33c8abf1@exrad6.ad.rad.co.il> <00d201cedee5$039eaa10$0adbfe30$@riw.us> <20131111141907.GO17999@um.es> <012601cedeea$a00097b0$e001c710$@riw.us> <114475f8112547b2bab678eca08278cb@exrad6.ad.rad.co.il> <20131111190652.GE18189@um.es> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.22 (2013-10-16) Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 11 Nov 2013 19:24:52 -0000 On Mon, Nov 11, 2013 at 08:18:29PM +0100, Robert Raszuk wrote: > Hi Pedro, > Hi, > > I think you are attributing so much to data plane. Data plane should > > just have functions that do not analyze the content of packets, i.e. > > functions that just decide to forward (or not) a packet and to which > > port it should be forwarded. > > I think you on the other hand vastly underestimate it. > Maybe. > Decision on where to forward the packet, how to decapsulate and > encapsulate it, decision about ECMP forwarding using physical and > virtual links, building FIB hierarchy all require sometimes complex > and time optimized code as well as do need deep analysis of the > content of the packet. > > What you sort of describe is of 1.0 definition ... and that's why its > of little use for practical applications. > I agree there are other functions for the data plane but I think it is better to keep things simple at first. Anyway, most of the functions you mention do not require to analyze packet content. > Best, > R. Regards, Pedro -- Pedro Martinez-Julia Department of Communication and Information Engineering Faculty of Computer Science University of Murcia Email: pedromj@um.es --------------------------------------------------------- *** Entia non sunt multiplicanda praeter necessitatem *** From rraszuk@gmail.com Mon Nov 11 11:27:58 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id F208C21E80F9 for ; Mon, 11 Nov 2013 11:27:57 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.528 X-Spam-Level: X-Spam-Status: No, score=-1.528 tagged_above=-999 required=5 tests=[AWL=0.450, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id l1zPuVcqdFi9 for ; Mon, 11 Nov 2013 11:27:57 -0800 (PST) Received: from mail-ie0-x22f.google.com (mail-ie0-x22f.google.com [IPv6:2607:f8b0:4001:c03::22f]) by ietfa.amsl.com (Postfix) with ESMTP id 7C83521E80F2 for ; Mon, 11 Nov 2013 11:27:57 -0800 (PST) Received: by mail-ie0-f175.google.com with SMTP id u16so4875061iet.6 for ; Mon, 11 Nov 2013 11:27:57 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:date:message-id:subject :from:to:cc:content-type; bh=4vBpgDIwPLMLrHfhSHRDd/V+3TMtpyP+D1Qm338xSb0=; b=oe2p2EFwoY5Mk1TOTkUZPnKVennkvAZRjvRgdKAskEyrCpgfl1R/pqSf9x1a100z5h BpvgN31csCBwBEug2CSwNNlRi/gsEWvkxc8IqDFv9Wmeoj9hjq3zqD0wkX1X/H58nDnR zuK2MGJdA7kpva+uvRkr7cwfBbu9AKG6P1zUGiABE2++SWCOcd96XV0GWDhlXYXAd7yc xUr464FpEpYSVXuk+463g3nzW7aYpJbUVHkMOUymYitCZD/Pu8j0qoBO/GRMgUN7O/ly kgBrpdcKEquKb/64SlsckGL9iT+3RHg6MmlSuOMqNI9Smnoytx4KCPjRr34oYev54GNx Q93A== MIME-Version: 1.0 X-Received: by 10.50.61.35 with SMTP id m3mr13434589igr.56.1384198077217; Mon, 11 Nov 2013 11:27:57 -0800 (PST) Sender: rraszuk@gmail.com Received: by 10.64.61.129 with HTTP; Mon, 11 Nov 2013 11:27:57 -0800 (PST) In-Reply-To: <20131111192443.GF18189@um.es> References: <001301ceded0$ab50b4c0$01f21e40$@riw.us> <4d2ee44e6fcb4dd18a26f8bc33c8abf1@exrad6.ad.rad.co.il> <00d201cedee5$039eaa10$0adbfe30$@riw.us> <20131111141907.GO17999@um.es> <012601cedeea$a00097b0$e001c710$@riw.us> <114475f8112547b2bab678eca08278cb@exrad6.ad.rad.co.il> <20131111190652.GE18189@um.es> <20131111192443.GF18189@um.es> Date: Mon, 11 Nov 2013 20:27:57 +0100 X-Google-Sender-Auth: ira4dZ7oxXnKOa5KYo48gUpVDVM Message-ID: From: Robert Raszuk To: Pedro Martinez-Julia Content-Type: text/plain; charset=ISO-8859-1 Cc: SDN IRTF list Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 11 Nov 2013 19:27:58 -0000 > I agree there are other functions for the data plane Great ! > but I think it is better to keep things simple at first. Keep it simple, but not simpler then necessary. Otherwise no one will use it. > Anyway, most of the functions you > mention do not require to analyze packet content. They all require to analyze the packet content. The only questions may be what depth of the packet inspection and modification during forwarding is required. r. From scott.brim@gmail.com Mon Nov 11 12:20:15 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 027A821E80E1 for ; Mon, 11 Nov 2013 12:20:15 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.555 X-Spam-Level: X-Spam-Status: No, score=-102.555 tagged_above=-999 required=5 tests=[AWL=0.044, BAYES_00=-2.599, HTML_MESSAGE=0.001, NO_RELAYS=-0.001, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id xEKATEN7LoUc for ; Mon, 11 Nov 2013 12:20:14 -0800 (PST) Received: from mail-ob0-x22b.google.com (mail-ob0-x22b.google.com [IPv6:2607:f8b0:4003:c01::22b]) by ietfa.amsl.com (Postfix) with ESMTP id C722F11E8137 for ; Mon, 11 Nov 2013 12:20:10 -0800 (PST) Received: by mail-ob0-f171.google.com with SMTP id gq1so4890856obb.16 for ; Mon, 11 Nov 2013 12:20:07 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; bh=poh+Klg6/SrBQ7FTZgTl3/+bZJWx2IP1DF/KdpHV8Cc=; b=V3S1O93GX5nylO25ijEpIdM5NTsVxegokw9v8CDaAD1L4Ct/kGQFRc2IizaCj+qTvH AhPuziCaG0ElQshcCgPqvlSMwSNVJfJ0XjksAWIrYBQqKiwm4TWwPw2P9aovH/o9pPay qwRZfSupCDbRU6tK7gYD44SrzOdeTBEAwjSU7gi4qOmxhAgxQ/1lnCn8+/KhUtw0aE1N /ItZlNWgooSkFJbWQ/YEpmYfc1FUKcKiO7lKUKfgoX0V4wr0j9Y6RZZC0uoEshj5hkl0 Pdnt0PH2WaSbmHTzkh55N5zymAm5WfLAp5SF6+9SvLAgz9fFb3wb9DsjCl1o2nxAmugE HUfQ== MIME-Version: 1.0 X-Received: by 10.182.250.163 with SMTP id zd3mr27115719obc.20.1384201207794; Mon, 11 Nov 2013 12:20:07 -0800 (PST) Received: by 10.182.2.134 with HTTP; Mon, 11 Nov 2013 12:20:07 -0800 (PST) In-Reply-To: <66422454-39A4-40F0-BFF6-986BFC4CAF9A@riw.us> References: <66422454-39A4-40F0-BFF6-986BFC4CAF9A@riw.us> Date: Mon, 11 Nov 2013 15:20:07 -0500 Message-ID: From: Scott Brim To: Russ White Content-Type: multipart/alternative; boundary=089e01634ec249d28404eaec7559 Cc: "sdn@irtf.org" Subject: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 11 Nov 2013 20:20:15 -0000 --089e01634ec249d28404eaec7559 Content-Type: text/plain; charset=ISO-8859-1 On Sun, Nov 10, 2013 at 11:35 PM, Russ White > wrote: > > For me the difference is between something that is supposed to be in > continuous operation, and something that is supposed to set up that > continuous operation. I see the former as control plane and forwarding > plane, and the latter as management. When you perform a management > function, then you can sit back and watch to make sure you did it right. A > control function, on the other hand, continues _as part of_ things going > right. > > I think this merges the control and data planes, though -- and I think we > want to be able to differentiate between them. Russ, maybe it merges your concepts of planes, but I'm trying to get you to use different concepts. In what I said, control and management are clearly separated. We can get to specifics if you like, as tests of conceptual models. Just keep in mind that components function in multiple planes simultaneously. Scott --089e01634ec249d28404eaec7559 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
On S= un, Nov 10, 2013 at 11:35 PM, Russ White <russw@riw.us> wrote:
> For me the difference is between something that is supposed to be= in continuous operation, and something that is supposed to set up that con= tinuous operation. =A0I see the former as control plane and forwarding plan= e, and the latter as management. =A0When you perform a management function,= then you can sit back and watch to make sure you did it right. =A0A contro= l function, on the other hand, continues _as part of_ things going right.
I think this merges the control and data planes, though -- and I thin= k we want to be able to differentiate between them.

Russ, maybe it merges your concepts of planes, but I'm trying = to get you to use different concepts. In what I said, control and managemen= t are clearly separated. We can get to specifics if you like, as tests of c= onceptual models. Just keep in mind that components function in multiple pl= anes simultaneously.=A0

Scott

--089e01634ec249d28404eaec7559-- From cpignata@cisco.com Mon Nov 11 13:52:17 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2CB4B11E8114 for ; Mon, 11 Nov 2013 13:52:17 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -110.276 X-Spam-Level: X-Spam-Status: No, score=-110.276 tagged_above=-999 required=5 tests=[AWL=0.323, BAYES_00=-2.599, RCVD_IN_DNSWL_HI=-8, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id IiNIuB9J1JIc for ; Mon, 11 Nov 2013 13:52:12 -0800 (PST) Received: from rtp-iport-2.cisco.com (rtp-iport-2.cisco.com [64.102.122.149]) by ietfa.amsl.com (Postfix) with ESMTP id 4445D21E8089 for ; Mon, 11 Nov 2013 13:52:12 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=1748; q=dns/txt; s=iport; t=1384206732; x=1385416332; h=from:to:cc:subject:date:message-id:references: in-reply-to:mime-version; bh=JPxYDlx1G0THol0Lbynx/Up8O9uRshloUI/jhkj4IXs=; b=Kcy+GBZ/0tMkvOXlEKpuodRN30m497YIZQBRNiNpUYItzakdDif4n9v1 HEZUIIaLYjMa2NgxBKJCqvyhQadDb+4DZ7KxJPb1zoyZwg1IFvSpp1Mw3 YXPg8YzdnCPbJjotnAqDNraw+J+4PpARdcafbhv39si9UbroDn24O1KeS Q=; X-Files: signature.asc : 203 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AhEFABtRgVKtJV2Z/2dsb2JhbABZgwc4U78WgUQWdIIlAQEBAwEBAQFrCwULAgEIRicLJQIEDgUOh20GDb5MBI0LglgHgyCBEAOQMIEwhi+SCoMmgio X-IronPort-AV: E=Sophos;i="4.93,680,1378857600"; d="asc'?scan'208";a="240503497" Received: from rcdn-core-2.cisco.com ([173.37.93.153]) by rtp-iport-2.cisco.com with ESMTP; 11 Nov 2013 21:52:11 +0000 Received: from xhc-rcd-x12.cisco.com (xhc-rcd-x12.cisco.com [173.37.183.86]) by rcdn-core-2.cisco.com (8.14.5/8.14.5) with ESMTP id rABLqA1P024639 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Mon, 11 Nov 2013 21:52:10 GMT Received: from xmb-aln-x02.cisco.com ([169.254.5.229]) by xhc-rcd-x12.cisco.com ([173.37.183.86]) with mapi id 14.03.0123.003; Mon, 11 Nov 2013 15:52:10 -0600 From: "Carlos Pignataro (cpignata)" To: Russ White Thread-Topic: [Sdn] Thoughts on Defining control and Management Planes Thread-Index: AQHO2xqrwFWjJHD27EiGosxotvsH6ZoZhQKAgADYuwCABdNIAIAAHq4AgAAjTgCAAAVjgIAAB/KAgAACtoCAAACRgIAAe0sA Date: Mon, 11 Nov 2013 21:52:10 +0000 Message-ID: <640DC4F7-33C2-4E24-A0D0-BB1609AE108C@cisco.com> References: <001301ceded0$ab50b4c0$01f21e40$@riw.us> <4d2ee44e6fcb4dd18a26f8bc33c8abf1@exrad6.ad.rad.co.il> <00d201cedee5$039eaa10$0adbfe30$@riw.us> <20131111141907.GO17999@um.es> <012601cedeea$a00097b0$e001c710$@riw.us> In-Reply-To: <012601cedeea$a00097b0$e001c710$@riw.us> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: x-originating-ip: [10.117.115.56] Content-Type: multipart/signed; boundary="Apple-Mail=_5B4252E2-572D-4DF9-9887-9FF3E4A18182"; protocol="application/pgp-signature"; micalg=pgp-sha1 MIME-Version: 1.0 Cc: SDN IRTF list , Pedro Martinez-Julia , Robert Raszuk Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 11 Nov 2013 21:52:17 -0000 --Apple-Mail=_5B4252E2-572D-4DF9-9887-9FF3E4A18182 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii On Nov 11, 2013, at 9:30 AM, Russ White wrote: >=20 >> How would you classify BFD running between two devices ? To which = plane >> in your "very clear" model does it belong ? >=20 > The control plane --it is a protocol which impacts the information = used to > actually forward packets. Not necessarily. It's a protocol that notifies a client, and that client = can be a routing protocol that would modify forwarding, or the client = can be a notification to an NMS that will log it without impact to = forwarding. The client can event be just a stub with no "action". Maybe = BFD is plane-less :-) Seems like BFD is executing a fault management function, triggering = control planes and management planes. I am not sure this makes a huge = difference in any case :-) > Speed doesn't matter, function does. >=20 That I agree with. -- Carlos. > :-) >=20 > Russ >=20 >=20 > _______________________________________________ > sdn mailing list > sdn@irtf.org > https://www.irtf.org/mailman/listinfo/sdn --Apple-Mail=_5B4252E2-572D-4DF9-9887-9FF3E4A18182 Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename="signature.asc" Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Message signed with OpenPGP using GPGMail -----BEGIN PGP SIGNATURE----- Comment: GPGTools - http://gpgtools.org iEYEARECAAYFAlKBUYgACgkQtfDPGTp3USwH+QCgggbICvblnJHXQDwL3PZo6oVH 5FEAoIZEOPGpLYwPRpgwEdXCJaH9JQr5 =klJi -----END PGP SIGNATURE----- --Apple-Mail=_5B4252E2-572D-4DF9-9887-9FF3E4A18182-- From rraszuk@gmail.com Mon Nov 11 13:58:44 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 71CA111E814B for ; Mon, 11 Nov 2013 13:58:44 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.538 X-Spam-Level: X-Spam-Status: No, score=-1.538 tagged_above=-999 required=5 tests=[AWL=0.440, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id AwD8fEUmK1xM for ; Mon, 11 Nov 2013 13:58:43 -0800 (PST) Received: from mail-ie0-x232.google.com (mail-ie0-x232.google.com [IPv6:2607:f8b0:4001:c03::232]) by ietfa.amsl.com (Postfix) with ESMTP id F22E321E8089 for ; Mon, 11 Nov 2013 13:58:42 -0800 (PST) Received: by mail-ie0-f178.google.com with SMTP id aq17so3301517iec.23 for ; Mon, 11 Nov 2013 13:58:40 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:date:message-id:subject :from:to:cc:content-type; bh=dH4ET9EpzyXM9gOrNAatkgF8whxr6FYbgKNiHO69tCA=; b=Cq+ZG51OJUVTf/lqeBc8Lwmz/rfPBdV0dT5vMux/qu0QjRagaIlVlfoGMt5DG4j0FC FT8kCp0VcbCXOn1iVgUCeulwO7qFZXkr7PVqjWfMamZY5HIkb/Wq8AE0VwtQt6ktmhtX HOGKbIgDlyOUmXz2FiqCK57uptfsm0H+vOoteq9jVFCeV0l4+O4OhLCAOF6OAof2ztS6 PA4MjboXal8AHQvHZGAgtjTYNpy1/jY1ciC444Or0u4x/sBkBQCa3TdmBuql2dhkL8ng UR+BMFOdlW5wP8Kaz4uJOKBVztK3iaf8TDg/tTmlWud7tjiCygUY4ahhsaFpe4xwzJm6 SWQg== MIME-Version: 1.0 X-Received: by 10.50.61.35 with SMTP id m3mr13762494igr.56.1384207120035; Mon, 11 Nov 2013 13:58:40 -0800 (PST) Sender: rraszuk@gmail.com Received: by 10.64.61.129 with HTTP; Mon, 11 Nov 2013 13:58:39 -0800 (PST) In-Reply-To: <640DC4F7-33C2-4E24-A0D0-BB1609AE108C@cisco.com> References: <001301ceded0$ab50b4c0$01f21e40$@riw.us> <4d2ee44e6fcb4dd18a26f8bc33c8abf1@exrad6.ad.rad.co.il> <00d201cedee5$039eaa10$0adbfe30$@riw.us> <20131111141907.GO17999@um.es> <012601cedeea$a00097b0$e001c710$@riw.us> <640DC4F7-33C2-4E24-A0D0-BB1609AE108C@cisco.com> Date: Mon, 11 Nov 2013 22:58:39 +0100 X-Google-Sender-Auth: 8oy3pznDOuhnju07EeZceLNwM9Q Message-ID: From: Robert Raszuk To: "Carlos Pignataro (cpignata)" Content-Type: text/plain; charset=ISO-8859-1 Cc: Russ White , SDN IRTF list , Pedro Martinez-Julia Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 11 Nov 2013 21:58:44 -0000 > It's a protocol that notifies a client, and that client can be a routing > protocol that would modify forwarding, Nope ... sorry :) That would be way too slow. BFD notification to routing protocol is just side product. BFD #1 goal is to notify forwarding hardware which switches over to backup path at the line card level without *any* action from RP. That switchover takes order of single miliseconds in modern hardware. The detection time is the longest to react to link/node failure. Note that backup paths are already pre-programmed and pre-resolved. Only few 100s of ms later RP takes actions to correct the entries reinstalling in make before break fashion new products of SPF and new set of backup paths. Best, R. From cpignata@cisco.com Mon Nov 11 13:59:15 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6A54321E8092 for ; Mon, 11 Nov 2013 13:59:14 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -110.289 X-Spam-Level: X-Spam-Status: No, score=-110.289 tagged_above=-999 required=5 tests=[AWL=0.310, BAYES_00=-2.599, RCVD_IN_DNSWL_HI=-8, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id XrbDGXTf0hLy for ; Mon, 11 Nov 2013 13:59:09 -0800 (PST) Received: from rcdn-iport-8.cisco.com (rcdn-iport-8.cisco.com [173.37.86.79]) by ietfa.amsl.com (Postfix) with ESMTP id 2097711E8114 for ; Mon, 11 Nov 2013 13:59:05 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=2627; q=dns/txt; s=iport; t=1384207145; x=1385416745; h=from:to:cc:subject:date:message-id:references: in-reply-to:mime-version; bh=zfIf1+AWuFk5TFgU7DPVuLC5SWMLLhijqO5ihYPqxhE=; b=NvwQdqY0C96ltQhivdgErgfB4Ndtwoa7gWcxHY5tuL3T+HESlm1/Fewv wD+kzwx4hvYGvY0ZM8jTKyrBH4lSlIaQWvECGzNFsoD/C43GqObkjW4XS /PsHOxNKVWH4X8ZuK2hW2/dru6b52GjfpeNKCcwlUOMiV70bksva1eG5w A=; X-Files: signature.asc : 203 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AhIFAPhRgVKtJXG//2dsb2JhbABZgwc4U78WgUQWdIIlAQEBAwEBAQFrCwULAgEIEgYuJwsXDgIEDgUOh20GDb5NjhqBSQeDIIEQA5AwgTCGL4EvkFuDJoFxOQ X-IronPort-AV: E=Sophos;i="4.93,680,1378857600"; d="asc'?scan'208";a="283434155" Received: from rcdn-core2-4.cisco.com ([173.37.113.191]) by rcdn-iport-8.cisco.com with ESMTP; 11 Nov 2013 21:59:04 +0000 Received: from xhc-rcd-x04.cisco.com (xhc-rcd-x04.cisco.com [173.37.183.78]) by rcdn-core2-4.cisco.com (8.14.5/8.14.5) with ESMTP id rABLx3hX009537 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Mon, 11 Nov 2013 21:59:03 GMT Received: from xmb-aln-x02.cisco.com ([169.254.5.229]) by xhc-rcd-x04.cisco.com ([fe80::200:5efe:173.37.183.34%12]) with mapi id 14.03.0123.003; Mon, 11 Nov 2013 15:59:03 -0600 From: "Carlos Pignataro (cpignata)" To: Pedro Martinez-Julia Thread-Topic: [Sdn] Thoughts on Defining control and Management Planes Thread-Index: AQHO2xqrwFWjJHD27EiGosxotvsH6ZoZhQKAgADYuwCABdNIAIAAHq4AgAAjTgCAAAVjgIAAB/KAgAACtoCAAAhmgIAAdWOA Date: Mon, 11 Nov 2013 21:59:02 +0000 Message-ID: References: <001301ceded0$ab50b4c0$01f21e40$@riw.us> <4d2ee44e6fcb4dd18a26f8bc33c8abf1@exrad6.ad.rad.co.il> <00d201cedee5$039eaa10$0adbfe30$@riw.us> <20131111141907.GO17999@um.es> <20131111145853.GA18189@um.es> In-Reply-To: <20131111145853.GA18189@um.es> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: x-originating-ip: [10.117.115.56] Content-Type: multipart/signed; boundary="Apple-Mail=_9863DB42-E887-48BA-9D40-5C4010CF8A05"; protocol="application/pgp-signature"; micalg=pgp-sha1 MIME-Version: 1.0 Cc: SDN IRTF list Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 11 Nov 2013 21:59:15 -0000 --Apple-Mail=_9863DB42-E887-48BA-9D40-5C4010CF8A05 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii On Nov 11, 2013, at 9:58 AM, Pedro Martinez-Julia wrote: > On Mon, Nov 11, 2013 at 03:28:49PM +0100, Robert Raszuk wrote: >> How would you classify BFD running between two devices ? To which >> plane in your "very clear" model does it belong ? >>=20 >=20 > For me, th BFD protocol is classified as control plane because it will > affect to the forwarding behavior (if BFD is connected to the device > forwarding tables). Management functions and protocols can affect the forwarding behavior as = well. I think this was mentioned in the meeting as well, in the context = of config management of control plane vs. a platform. > The reason for not being part of the data plane is > obvious, it does not forwards packets form other entities. It is not > from a management plane because its objective is not to communicate > administrative decisions. >=20 > On the other hand, if BFD is just used to know the health of links, it > can effectively be considered part of the management plane. This can = be > an example of how the same protocol may operate for the control plane = or > for the management plane, but it does not break the boundaries among = the > planes, just demonstrates that the classification should be applied to > running functions/protocols, not to their architecture. Yes. Does this also help? http://tools.ietf.org/html/draft-shore-icmp-aup-06#section-4 Thanks, -- Carlos. >=20 >> Best, >> r. >=20 > Regards, > Pedro >=20 > --=20 > Pedro Martinez-Julia > Department of Communication and Information Engineering > Faculty of Computer Science > University of Murcia > Email: pedromj@um.es > --------------------------------------------------------- > *** Entia non sunt multiplicanda praeter necessitatem *** > _______________________________________________ > sdn mailing list > sdn@irtf.org > https://www.irtf.org/mailman/listinfo/sdn --Apple-Mail=_9863DB42-E887-48BA-9D40-5C4010CF8A05 Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename="signature.asc" Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Message signed with OpenPGP using GPGMail -----BEGIN PGP SIGNATURE----- Comment: GPGTools - http://gpgtools.org iEYEARECAAYFAlKBUyUACgkQtfDPGTp3USzgLgCgnTGXI108j0sekWioNF8gnV8T 2jwAoJV4u/zsbth8WcwsJflg0SmkDAXf =X+4p -----END PGP SIGNATURE----- --Apple-Mail=_9863DB42-E887-48BA-9D40-5C4010CF8A05-- From cpignata@cisco.com Mon Nov 11 14:13:19 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5924E11E80F9 for ; 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X-Files: signature.asc : 203 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AhEFAINVgVKtJXHA/2dsb2JhbABZgwc4U78WgUQWdIIlAQEBAwEBAQFrCxACAQhGJwslAgQOBQ6HbQYNvlCOEYFSB4MggRADkDCBMIIMQoNhgS+QW4Mmgio X-IronPort-AV: E=Sophos;i="4.93,680,1378857600"; d="asc'?scan'208";a="283391033" Received: from rcdn-core2-5.cisco.com ([173.37.113.192]) by rcdn-iport-2.cisco.com with ESMTP; 11 Nov 2013 22:13:13 +0000 Received: from xhc-aln-x06.cisco.com (xhc-aln-x06.cisco.com [173.36.12.80]) by rcdn-core2-5.cisco.com (8.14.5/8.14.5) with ESMTP id rABMDDda003571 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Mon, 11 Nov 2013 22:13:13 GMT Received: from xmb-aln-x02.cisco.com ([169.254.5.229]) by xhc-aln-x06.cisco.com ([173.36.12.80]) with mapi id 14.03.0123.003; Mon, 11 Nov 2013 16:13:13 -0600 From: "Carlos Pignataro (cpignata)" To: Robert Raszuk Thread-Topic: [Sdn] Thoughts on Defining control and Management Planes Thread-Index: AQHO2xqrwFWjJHD27EiGosxotvsH6ZoZhQKAgADYuwCABdNIAIAAHq4AgAAjTgCAAAVjgIAAB/KAgAACtoCAAACRgIAAe0sAgAAB0oCAAAQQgA== Date: Mon, 11 Nov 2013 22:13:13 +0000 Message-ID: <6347AD1C-4BB4-4AED-861C-99371B7C64D6@cisco.com> References: <001301ceded0$ab50b4c0$01f21e40$@riw.us> <4d2ee44e6fcb4dd18a26f8bc33c8abf1@exrad6.ad.rad.co.il> <00d201cedee5$039eaa10$0adbfe30$@riw.us> <20131111141907.GO17999@um.es> <012601cedeea$a00097b0$e001c710$@riw.us> <640DC4F7-33C2-4E24-A0D0-BB1609AE108C@cisco.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: x-originating-ip: [10.117.115.56] Content-Type: multipart/signed; boundary="Apple-Mail=_B976A969-4826-444F-AD8B-55B479B353DF"; protocol="application/pgp-signature"; micalg=pgp-sha1 MIME-Version: 1.0 Cc: Russ White , SDN IRTF list , Pedro Martinez-Julia Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 11 Nov 2013 22:13:19 -0000 --Apple-Mail=_B976A969-4826-444F-AD8B-55B479B353DF Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii On Nov 11, 2013, at 4:58 PM, Robert Raszuk wrote: >> It's a protocol that notifies a client, and that client can be a = routing >> protocol that would modify forwarding, >=20 > Nope ... sorry :) Please see http://tools.ietf.org/html/rfc5882#section-4 I understand local optimizations, and certainly BFD's interaction with = clients is mostly an implementation issue, but: http://tools.ietf.org/html/rfc5880 BFD can be abstracted as a simple service. The service primitives provided by BFD are to create, destroy, and modify a session, given the destination address and other parameters. BFD in return provides a signal to its clients indicating when the BFD session goes up or down. http://tools.ietf.org/html/rfc5882 It is important to remember that the interaction between BFD and its client applications has essentially no interoperability issues, because BFD is acting in an advisory nature (similar to hardware signaling the loss of light on a fiber optic circuit, for example) and existing mechanisms in the client applications are used in reaction to BFD events. In fact, BFD may interact with only one of a pair of systems for a particular client application without any ill effect. etc. >=20 > That would be way too slow. BFD notification to routing protocol is > just side product. BFD #1 goal is to notify forwarding hardware which > switches over to backup path at the line card level without *any* > action from RP. That switchover takes order of single miliseconds in > modern hardware. The detection time is the longest to react to > link/node failure. >=20 > Note that backup paths are already pre-programmed and pre-resolved. > Only few 100s of ms later RP takes actions to correct the entries > reinstalling in make before break fashion new products of SPF and new > set of backup paths. See above. Thanks, -- Carlos. >=20 > Best, > R. > _______________________________________________ > sdn mailing list > sdn@irtf.org > https://www.irtf.org/mailman/listinfo/sdn --Apple-Mail=_B976A969-4826-444F-AD8B-55B479B353DF Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename="signature.asc" Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Message signed with OpenPGP using GPGMail -----BEGIN PGP SIGNATURE----- Comment: GPGTools - http://gpgtools.org iEYEARECAAYFAlKBVncACgkQtfDPGTp3USwxTwCggzfycLMbnHLzR6k/Y5XiMh7d qUMAnRFpOR9hdHN9Wkr+oD2WLBiGPeKV =vEmc -----END PGP SIGNATURE----- --Apple-Mail=_B976A969-4826-444F-AD8B-55B479B353DF-- From rraszuk@gmail.com Mon Nov 11 14:23:44 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id F3FDE21E80F4 for ; Mon, 11 Nov 2013 14:23:43 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.547 X-Spam-Level: X-Spam-Status: No, score=-1.547 tagged_above=-999 required=5 tests=[AWL=0.431, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id pWfpLkPowFgt for ; Mon, 11 Nov 2013 14:23:43 -0800 (PST) Received: from mail-ie0-x22a.google.com (mail-ie0-x22a.google.com [IPv6:2607:f8b0:4001:c03::22a]) by ietfa.amsl.com (Postfix) with ESMTP id 7563F21E80F1 for ; Mon, 11 Nov 2013 14:23:35 -0800 (PST) Received: by mail-ie0-f170.google.com with SMTP id to1so3422602ieb.15 for ; Mon, 11 Nov 2013 14:23:35 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:date:message-id:subject :from:to:cc:content-type; bh=SYnwn3xsfePPlTO8XPIHjPbT2InA2Xmq0kAxB/oegzk=; b=NyLRG0yuJCyIG2fV6kW90pZr06epE66khqzJ5pGVM2z3SoDsGpk5gFIO8ylAvH3uRC OXFiBuYPh2IwDTQO9sAeLuPo721YdChB9oPhc2BSYQYkMRMNHadUK29YOXPC9RxHwFST vu8r8fNuFP0rVglmk4C7Y4jOHfprz/jSl29POQVGZ5hhJtINyTe1bdywYin6zG+tpj5h MPNuPev7F0J8RoME9NfRXAKdfWEeH4ZtAhTOdnHVKM/v5Iog2t3RE8G0MjWn6OhCuG0r 9LFWma37NjRpEquzMPmgDHPg5Rhg14uh5vvEk5gl5QxNuruEbAUIbgw1BmjNA0rqP3Gf yuWg== MIME-Version: 1.0 X-Received: by 10.50.11.67 with SMTP id o3mr13783080igb.55.1384208615001; Mon, 11 Nov 2013 14:23:35 -0800 (PST) Sender: rraszuk@gmail.com Received: by 10.64.61.129 with HTTP; Mon, 11 Nov 2013 14:23:34 -0800 (PST) In-Reply-To: <6347AD1C-4BB4-4AED-861C-99371B7C64D6@cisco.com> References: <001301ceded0$ab50b4c0$01f21e40$@riw.us> <4d2ee44e6fcb4dd18a26f8bc33c8abf1@exrad6.ad.rad.co.il> <00d201cedee5$039eaa10$0adbfe30$@riw.us> <20131111141907.GO17999@um.es> <012601cedeea$a00097b0$e001c710$@riw.us> <640DC4F7-33C2-4E24-A0D0-BB1609AE108C@cisco.com> <6347AD1C-4BB4-4AED-861C-99371B7C64D6@cisco.com> Date: Mon, 11 Nov 2013 23:23:34 +0100 X-Google-Sender-Auth: 0xVjLYAglTJVo1VoJir17Ep2Be4 Message-ID: From: Robert Raszuk To: "Carlos Pignataro (cpignata)" Content-Type: text/plain; charset=ISO-8859-1 Cc: Russ White , SDN IRTF list , Pedro Martinez-Julia Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 11 Nov 2013 22:23:44 -0000 My comment was not regarding BFD RFC and its interoperability, but to your point of BFD client being routing protocol as number one. It is just one of many and for real use case of BFD not the most important one. In fact BFD very often brings interface down, then rest of events just happen. So BFD does not directly communicate in this case with any routing protocol. Rgs, R. On Mon, Nov 11, 2013 at 11:13 PM, Carlos Pignataro (cpignata) wrote: > > On Nov 11, 2013, at 4:58 PM, Robert Raszuk wrote: > >>> It's a protocol that notifies a client, and that client can be a routing >>> protocol that would modify forwarding, >> >> Nope ... sorry :) > > Please see http://tools.ietf.org/html/rfc5882#section-4 > > I understand local optimizations, and certainly BFD's interaction with clients is mostly an implementation issue, but: > > http://tools.ietf.org/html/rfc5880 > BFD can be abstracted as a simple service. The service primitives > provided by BFD are to create, destroy, and modify a session, given > the destination address and other parameters. BFD in return provides > a signal to its clients indicating when the BFD session goes up or > down. > http://tools.ietf.org/html/rfc5882 > > It is important to remember that the interaction between BFD and its > client applications has essentially no interoperability issues, > because BFD is acting in an advisory nature (similar to hardware > signaling the loss of light on a fiber optic circuit, for example) > and existing mechanisms in the client applications are used in > reaction to BFD events. In fact, BFD may interact with only one of a > pair of systems for a particular client application without any ill > effect. > etc. > >> >> That would be way too slow. BFD notification to routing protocol is >> just side product. BFD #1 goal is to notify forwarding hardware which >> switches over to backup path at the line card level without *any* >> action from RP. That switchover takes order of single miliseconds in >> modern hardware. The detection time is the longest to react to >> link/node failure. >> >> Note that backup paths are already pre-programmed and pre-resolved. >> Only few 100s of ms later RP takes actions to correct the entries >> reinstalling in make before break fashion new products of SPF and new >> set of backup paths. > > See above. > > Thanks, > > -- Carlos. > >> >> Best, >> R. >> _______________________________________________ >> sdn mailing list >> sdn@irtf.org >> https://www.irtf.org/mailman/listinfo/sdn > From cpignata@cisco.com Mon Nov 11 14:32:32 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 76A7321E8089 for ; Mon, 11 Nov 2013 14:32:32 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -110.457 X-Spam-Level: X-Spam-Status: No, score=-110.457 tagged_above=-999 required=5 tests=[AWL=0.141, BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-8, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 8PyDJk2tVX4r for ; Mon, 11 Nov 2013 14:32:27 -0800 (PST) Received: from rtp-iport-2.cisco.com (rtp-iport-2.cisco.com [64.102.122.149]) by ietfa.amsl.com (Postfix) with ESMTP id 203B811E8103 for ; Mon, 11 Nov 2013 14:32:27 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=11116; q=dns/txt; s=iport; t=1384209147; x=1385418747; h=from:to:cc:subject:date:message-id:references: in-reply-to:mime-version; bh=6fcTGv+QUA1hhgMM6UhclCBOp2c58nCwmN2aoIkT/ZM=; b=eH4S9DrGyATkK0NkkXr1ApxguAe7HohMzDL0kUotbFGlC+2qC2P3BKQT 6Q0EQBV48ULd1n4h7LRHbWY7ZUo4H0X7vIYOdw9c0czG60qh9PMGqC6dW HdedTWXcc2aeWcVoEeY17GsAQfONquBcvQq01viKmHCd5GdQOF5PfJGbn U=; X-Files: signature.asc : 203 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AtEFAHRagVKtJV2c/2dsb2JhbABZgwc4U4QSsj6IRoFDFnSCJQEBAQMBAQEBawsFCwIBCBguJwslAgQOBQ6HbQYNvkOOEYFSB4MggRADkDCBMIIMQoNhgS+QW4Mmgio X-IronPort-AV: E=Sophos;i="4.93,680,1378857600"; d="asc'?scan'208,217";a="240510678" Received: from rcdn-core-5.cisco.com ([173.37.93.156]) by rtp-iport-2.cisco.com with ESMTP; 11 Nov 2013 22:32:25 +0000 Received: from xhc-aln-x09.cisco.com (xhc-aln-x09.cisco.com [173.36.12.83]) by rcdn-core-5.cisco.com (8.14.5/8.14.5) with ESMTP id rABMWPju025718 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Mon, 11 Nov 2013 22:32:25 GMT Received: from xmb-aln-x02.cisco.com ([169.254.5.229]) by xhc-aln-x09.cisco.com ([173.36.12.83]) with mapi id 14.03.0123.003; Mon, 11 Nov 2013 16:32:25 -0600 From: "Carlos Pignataro (cpignata)" To: Robert Raszuk Thread-Topic: [Sdn] Thoughts on Defining control and Management Planes Thread-Index: AQHO2xqrwFWjJHD27EiGosxotvsH6ZoZhQKAgADYuwCABdNIAIAAHq4AgAAjTgCAAAVjgIAAB/KAgAACtoCAAACRgIAAe0sAgAAB0oCAAAQQgIAAAucAgAACdQA= Date: Mon, 11 Nov 2013 22:32:24 +0000 Message-ID: <48E055C8-5AB5-4A57-A7EF-848725E4A261@cisco.com> References: <001301ceded0$ab50b4c0$01f21e40$@riw.us> <4d2ee44e6fcb4dd18a26f8bc33c8abf1@exrad6.ad.rad.co.il> <00d201cedee5$039eaa10$0adbfe30$@riw.us> <20131111141907.GO17999@um.es> <012601cedeea$a00097b0$e001c710$@riw.us> <640DC4F7-33C2-4E24-A0D0-BB1609AE108C@cisco.com> <6347AD1C-4BB4-4AED-861C-99371B7C64D6@cisco.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: x-originating-ip: [10.117.115.56] Content-Type: multipart/signed; boundary="Apple-Mail=_33B1985E-C1BE-4DB5-B9A9-BE0B77E89AF1"; protocol="application/pgp-signature"; micalg=pgp-sha1 MIME-Version: 1.0 Cc: Russ White , SDN IRTF list , Pedro Martinez-Julia Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 11 Nov 2013 22:32:32 -0000 --Apple-Mail=_33B1985E-C1BE-4DB5-B9A9-BE0B77E89AF1 Content-Type: multipart/alternative; boundary="Apple-Mail=_7A9177BE-FBD6-4ED2-AF74-1377BD3C5FB2" --Apple-Mail=_7A9177BE-FBD6-4ED2-AF74-1377BD3C5FB2 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=iso-8859-1 Robert, On Nov 11, 2013, at 5:23 PM, Robert Raszuk wrote: > My comment was not regarding BFD RFC and its interoperability, but to > your point of BFD client being routing protocol as number one. It is > just one of many and for real use case of BFD not the most important > one. You missed my point. My point was that BFD does not modify forwarding. My point was that BFD signals its clients, and other functions or = protocols (bfd clients) take action. Your partial mis-quote of my comment edited out the key elements of my = response. Let me try again: "Not necessarily. It's a protocol that notifies a client, and that = client can be a routing protocol that would modify forwarding, or the = client can be a notification to an NMS that will log it without impact = to forwarding. The client can event be just a stub with no "action". " Number one? Maybe you misread and were commenting on something you = thought you were reading? >=20 > In fact BFD very often brings interface down, then rest of events just > happen. So BFD does not directly communicate in this case with any > routing protocol. Nope. There is a reason why this draft did not progress: http://tools.ietf.org/html/draft-shen-bfd-intf-p2p-nbr-00 ("Interface = Based Point-to-Point Neighbor BFD") This draft says: This document describes a special application for BFD over point-to-point physical or logical circuits. This application is not a normal BFD client such as upper layer routing protocol, but it is a management element for circuit itself where BFD is required and configured. ... INTF-P2P Neighbor BFD is an application of BFD [3], the client is the interface where BFD service is required.=20 Best, Carlos. >=20 > Rgs, > R. >=20 > On Mon, Nov 11, 2013 at 11:13 PM, Carlos Pignataro (cpignata) > wrote: >>=20 >> On Nov 11, 2013, at 4:58 PM, Robert Raszuk wrote: >>=20 >>>> It's a protocol that notifies a client, and that client can be a = routing >>>> protocol that would modify forwarding, >>>=20 >>> Nope ... sorry :) >>=20 >> Please see http://tools.ietf.org/html/rfc5882#section-4 >>=20 >> I understand local optimizations, and certainly BFD's interaction = with clients is mostly an implementation issue, but: >>=20 >> http://tools.ietf.org/html/rfc5880 >> BFD can be abstracted as a simple service. The service primitives >> provided by BFD are to create, destroy, and modify a session, given >> the destination address and other parameters. BFD in return = provides >> a signal to its clients indicating when the BFD session goes up or >> down. >> http://tools.ietf.org/html/rfc5882 >>=20 >> It is important to remember that the interaction between BFD and = its >> client applications has essentially no interoperability issues, >> because BFD is acting in an advisory nature (similar to hardware >> signaling the loss of light on a fiber optic circuit, for example) >> and existing mechanisms in the client applications are used in >> reaction to BFD events. In fact, BFD may interact with only one of = a >> pair of systems for a particular client application without any ill >> effect. >> etc. >>=20 >>>=20 >>> That would be way too slow. BFD notification to routing protocol is >>> just side product. BFD #1 goal is to notify forwarding hardware = which >>> switches over to backup path at the line card level without *any* >>> action from RP. That switchover takes order of single miliseconds in >>> modern hardware. The detection time is the longest to react to >>> link/node failure. >>>=20 >>> Note that backup paths are already pre-programmed and pre-resolved. >>> Only few 100s of ms later RP takes actions to correct the entries >>> reinstalling in make before break fashion new products of SPF and = new >>> set of backup paths. >>=20 >> See above. >>=20 >> Thanks, >>=20 >> -- Carlos. >>=20 >>>=20 >>> Best, >>> R. >>> _______________________________________________ >>> sdn mailing list >>> sdn@irtf.org >>> https://www.irtf.org/mailman/listinfo/sdn >>=20 --Apple-Mail=_7A9177BE-FBD6-4ED2-AF74-1377BD3C5FB2 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=iso-8859-1 Robert,

On Nov 11, 2013, at 5:23 = PM, Robert Raszuk <robert@raszuk.net> = wrote:

My comment was not regarding BFD RFC and its = interoperability, but to
your point of BFD client being routing = protocol as number one. It is
just one of many and for real use case = of BFD not the most = important
one.

You missed my = point.

My point was that BFD does not modify = forwarding.

My point was that BFD signals its = clients, and other functions or protocols (bfd clients) take = action.

Your partial mis-quote  of my = comment edited out the key elements of my response. Let me try = again:

"Not necessarily. It's a protocol that = notifies a client, and that client can be a routing protocol that would = modify forwarding, or the client can be a notification to an NMS that = will log it without impact to forwarding. The client can event be just a = stub with no "action". "

Number one? Maybe you = misread and were commenting on something you thought you were = reading?


In fact BFD very often = brings interface down, then rest of events just
happen. So BFD does = not directly communicate in this case with any
routing = protocol.

Nope.

There is a reason why this draft did not progress:
http://= tools.ietf.org/html/draft-shen-bfd-intf-p2p-nbr-00 ("Interface Based = Point-to-Point Neighbor BFD")

This draft = says:
   This document describes a =
special application for BFD over
   point-to-point physical or logical circuits. This application
   is not a normal BFD client such as upper layer routing
   protocol, but it is a management element for circuit itself
   where BFD is required and configured.
...
   INTF-P2P Neighbor BFD is an application of BFD [3], the =
client is
   the interface where BFD service is required. =
Best,

Carlos.


Rgs,
R.

On Mon, Nov 11, 2013 at = 11:13 PM, Carlos Pignataro (cpignata)
<cpignata@cisco.com> = wrote:

On Nov 11, 2013, at 4:58 PM, = Robert Raszuk <robert@raszuk.net> = wrote:

It's a = protocol that notifies a client, and that client can be a = routing
protocol that would modify = forwarding,

Nope ... sorry = :)

Please see http://tools.ietf.or= g/html/rfc5882#section-4

I understand local optimizations, = and certainly BFD's interaction with clients is mostly an implementation = issue, but:

http://tools.ietf.org/html/rfc= 5880
  BFD can be abstracted as a simple service. =  The service primitives
  provided by BFD are to = create, destroy, and modify a session, given
  the = destination address and other parameters.  BFD in return = provides
  a signal to its clients indicating when the BFD = session goes up or
=   down.
http://tools.ietf.org/html/rfc5882

=   It is important to remember that the interaction between BFD = and its
  client applications has essentially no = interoperability issues,
  because BFD is acting in an = advisory nature (similar to hardware
  signaling the loss = of light on a fiber optic circuit, for example)
  and = existing mechanisms in the client applications are used in
=   reaction to BFD events.  In fact, BFD may interact with = only one of a
  pair of systems for a particular client = application without any ill
=   effect.
etc.


That = would be way too slow. BFD notification to routing protocol is
just = side product. BFD #1 goal is to notify forwarding hardware = which
switches over to backup path at the line card level without = *any*
action from RP. That switchover takes order of single = miliseconds in
modern hardware. The detection time is the longest to = react to
link/node failure.

Note that backup paths are already = pre-programmed and pre-resolved.
Only few 100s of ms later RP takes = actions to correct the entries
reinstalling in make before break = fashion new products of SPF and new
set of backup = paths.

See above.

Thanks,

-- = Carlos.


Best,
R.
_________________________________________= ______
sdn mailing = list
sdn@irtf.org
https://www.irtf.org/mailman/listinfo/sdn


= --Apple-Mail=_7A9177BE-FBD6-4ED2-AF74-1377BD3C5FB2-- --Apple-Mail=_33B1985E-C1BE-4DB5-B9A9-BE0B77E89AF1 Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename="signature.asc" Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Message signed with OpenPGP using GPGMail -----BEGIN PGP SIGNATURE----- Comment: GPGTools - http://gpgtools.org iEYEARECAAYFAlKBWvcACgkQtfDPGTp3USzgkgCeMfnrPWPy4H1TPHRLB0qYQ3hb l/AAn040LfGb81y5RrFzVS3YoU1LQDVY =R1AM -----END PGP SIGNATURE----- --Apple-Mail=_33B1985E-C1BE-4DB5-B9A9-BE0B77E89AF1-- From sriganeshkini@gmail.com Mon Nov 11 14:34:59 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 481C021E8089 for ; Mon, 11 Nov 2013 14:34:59 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.978 X-Spam-Level: X-Spam-Status: No, score=-1.978 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 72K-EZVlIA90 for ; Mon, 11 Nov 2013 14:34:58 -0800 (PST) Received: from mail-pd0-x22a.google.com (mail-pd0-x22a.google.com [IPv6:2607:f8b0:400e:c02::22a]) by ietfa.amsl.com (Postfix) with ESMTP id C0ECF11E8114 for ; Mon, 11 Nov 2013 14:34:58 -0800 (PST) Received: by mail-pd0-f170.google.com with SMTP id q10so2501421pdj.15 for ; Mon, 11 Nov 2013 14:34:58 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:from:date:message-id :subject:to:cc:content-type; bh=7cHWSPvxXwTnRnfG+eBaTZXMgMVrOf1hw0TvBOoIY0U=; b=mK7laXnzs9z4k3DQmDnSPty9A9oB3jfSlrmHCrmAWgr0aW+HCFV0e9SGq26Y7svI6F RqrE8BEbzEIe2xvquOZF5bHeZipPL0T7BsmgpfwTzE9gLU9+Kj3fIqwbVkEeXOA/g7pm j4rn6XFruMHSSFO4NylQGTnnlICrxd0Cgy0LQnE71rezz/kVnxqEdw5iLw0YiUXnB3Dt ijhR3TrrkWiJKZ5vumWCnbR/0S9mKblgPkeUV80YTo/S4+CzbrRhocvor0kBS7QBLhDm 1qXnw7CkMkyuetEYNku+Fy5PcZJwj62OeytL/LLcs3nJWZoVEGnOOsgKwn/cNyZs0VnS 6ToA== X-Received: by 10.68.229.167 with SMTP id sr7mr4965624pbc.159.1384209298259; Mon, 11 Nov 2013 14:34:58 -0800 (PST) MIME-Version: 1.0 Sender: sriganeshkini@gmail.com Received: by 10.70.0.228 with HTTP; Mon, 11 Nov 2013 14:34:28 -0800 (PST) In-Reply-To: References: <001301ceded0$ab50b4c0$01f21e40$@riw.us> <4d2ee44e6fcb4dd18a26f8bc33c8abf1@exrad6.ad.rad.co.il> <00d201cedee5$039eaa10$0adbfe30$@riw.us> <20131111141907.GO17999@um.es> <012601cedeea$a00097b0$e001c710$@riw.us> <640DC4F7-33C2-4E24-A0D0-BB1609AE108C@cisco.com> From: Sriganesh Kini Date: Mon, 11 Nov 2013 14:34:28 -0800 X-Google-Sender-Auth: ytgniEid3yxfGhPxR6tfTIibT3E Message-ID: To: Robert Raszuk Content-Type: text/plain; charset=UTF-8 Cc: Russ White , "Carlos Pignataro \(cpignata\)" , SDN IRTF list , Pedro Martinez-Julia Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 11 Nov 2013 22:34:59 -0000 We seem to be using control-plane and routing-protocols as synonyms. They are not. Routing protocols are considered part of the control plane. But that does not mean that the control-plane consists only of the routing-protocols. We also seem to restrict control-plane to functionality that runs on the route-processor cards but rule out any functionality running on the line-cards. Route-processors cards and line-cards are implementation/system-architecture components whereas control and forwarding plane are functional decomposition components. BFD is control-plane functionality. So is any function (that may exist on the line-card) that builds structures that are required for forwarding a packet. This includes actions on say a BFD-down event that may take place entirely on the line-card. Forwarding-plane is just the function that is executed when a user-traffic is received. If the traffic received is control-plane traffic, then all functions executed once the packet is identified as control-plane traffic, is a part of control-plane, irrespective of whether it occurs in the line-card or route-processor-card or any other card in a system. - Sri On Mon, Nov 11, 2013 at 1:58 PM, Robert Raszuk wrote: >> It's a protocol that notifies a client, and that client can be a routing >> protocol that would modify forwarding, > > Nope ... sorry :) > > That would be way too slow. BFD notification to routing protocol is > just side product. BFD #1 goal is to notify forwarding hardware which > switches over to backup path at the line card level without *any* > action from RP. That switchover takes order of single miliseconds in > modern hardware. The detection time is the longest to react to > link/node failure. > > Note that backup paths are already pre-programmed and pre-resolved. > Only few 100s of ms later RP takes actions to correct the entries > reinstalling in make before break fashion new products of SPF and new > set of backup paths. > > Best, > R. > _______________________________________________ > sdn mailing list > sdn@irtf.org > https://www.irtf.org/mailman/listinfo/sdn From russw@riw.us Mon Nov 11 15:55:17 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 35C1F21E811E for ; Mon, 11 Nov 2013 15:55:17 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.598 X-Spam-Level: X-Spam-Status: No, score=-2.598 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id KEPf5Cu4p-0c for ; Mon, 11 Nov 2013 15:55:12 -0800 (PST) Received: from server.riw.us (server.riw.us [162.144.32.236]) by ietfa.amsl.com (Postfix) with ESMTP id 7A20D21E80FC for ; Mon, 11 Nov 2013 15:55:12 -0800 (PST) Received: from [166.170.57.235] (port=33370 helo=[10.5.23.157]) by server.riw.us with esmtpa (Exim 4.80.1) (envelope-from ) id 1Vg1Jw-0008I7-DQ; Mon, 11 Nov 2013 23:55:04 +0000 MIME-Version: 1.0 To: Yaakov Stein , 'Robert Raszuk' , 'Pedro Martinez-Julia' From: Russ White Date: Mon, 11 Nov 2013 18:54:33 -0500 Content-Type: multipart/alternative; boundary="_BFA6A43C-049E-4706-9901-C70FB68667A5_" X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server.riw.us X-AntiAbuse: Original Domain - irtf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - riw.us X-Get-Message-Sender-Via: server.riw.us: authenticated_id: russw@riw.us X-Source: X-Source-Args: X-Source-Dir: Message-Id: <20131111235512.7A20D21E80FC@ietfa.amsl.com> Cc: 'SDN IRTF list' Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 11 Nov 2013 23:55:17 -0000 --_BFA6A43C-049E-4706-9901-C70FB68667A5_ Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Then routed ip networks don't have a management plane... But this is anothe= r problem with classifying these planes by there characteristics rather tha= n their function. What functional difference does it make how the packet gets there? :-) Russ -----Original Message----- From: "Yaakov Stein" Sent: =E2=80=8E11/=E2=80=8E11/=E2=80=8E2013 12:43 PM To: "Russ White" ; "'Robert Raszuk'" ; "'P= edro Martinez-Julia'" Cc: "'SDN IRTF list'" Subject: RE: [Sdn] Thoughts on Defining control and Management Planes No, BFD is data plane. Control plane protocols can be sent out-of-band; would out-of-band BFD mean anything ? Y(J)S -----Original Message----- From: sdn-bounces@irtf.org [mailto:sdn-bounces@irtf.org] On Behalf Of Russ = White Sent: 11 November, 2013 16:31 To: 'Robert Raszuk'; 'Pedro Martinez-Julia' Cc: 'SDN IRTF list' Subject: Re: [Sdn] Thoughts on Defining control and Management Planes > How would you classify BFD running between two devices ? To which=20 > plane in your "very clear" model does it belong ? The control plane --it is a protocol which impacts the information used to = actually forward packets. Speed doesn't matter, function does. :-) Russ _______________________________________________ sdn mailing list sdn@irtf.org https://www.irtf.org/mailman/listinfo/sdn --_BFA6A43C-049E-4706-9901-C70FB68667A5_ Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset="utf-8"

Then ro= uted ip networks don't have a management plane... But this is another probl= em with classifying these planes by there characteristics rather than their= function.

What functional difference does it make how the packet ge= ts there?

:-)

Russ
From: Yaakov Stein
= Sent: =E2=80=8E11/=E2=80=8E11/=E2=80=8E2013 12:43 PM
To: Russ White; 'Robert Raszuk'; 'Pedro = Martinez-Julia'
Cc: 'SD= N IRTF list'
Subject: RE: [Sdn] Thoughts on Defining co= ntrol and Management Planes

No, BFD is data plane.
<= BR>Control plane protocols can be sent out-of-band;
would out-of-band BF= D mean anything ?



Y(J)S


-----Original Message----= -
From: sdn-bounces@irtf.org [mailto:sdn-bounces@irtf.org] On Behalf Of = Russ White
Sent: 11 November, 2013 16:31
To: 'Robert Raszuk'; 'Pedro = Martinez-Julia'
Cc: 'SDN IRTF list'
Subject: Re: [Sdn] Thoughts on De= fining control and Management Planes


> How would you classify= BFD running between two devices ? To which
> plane in your "very cl= ear" model does it belong ?

The control plane --it is a protocol whi= ch impacts the information used to actually forward packets. Speed doesn't = matter, function does.

:-)

Russ


__________________= _____________________________
sdn mailing list
sdn@irtf.org
https:= //www.irtf.org/mailman/listinfo/sdn
= --_BFA6A43C-049E-4706-9901-C70FB68667A5_-- From ramk@Brocade.com Mon Nov 11 15:56:53 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D07BA21E8137 for ; Mon, 11 Nov 2013 15:56:53 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -3.265 X-Spam-Level: X-Spam-Status: No, score=-3.265 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, IP_NOT_FRIENDLY=0.334, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id WFkgBly9LJkr for ; Mon, 11 Nov 2013 15:56:48 -0800 (PST) Received: from mx0b-000f0801.pphosted.com (mx0b-000f0801.pphosted.com [67.231.152.113]) by ietfa.amsl.com (Postfix) with ESMTP id AD08621E80F8 for ; Mon, 11 Nov 2013 15:56:48 -0800 (PST) Received: from pps.filterd (m0000700 [127.0.0.1]) by mx0b-000f0801.pphosted.com (8.14.5/8.14.5) with SMTP id rABNl2Nn029140; Mon, 11 Nov 2013 15:56:45 -0800 Received: from hq1wp-exchub02.corp.brocade.com ([144.49.131.13]) by mx0b-000f0801.pphosted.com with ESMTP id 1g31q80agd-1 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=NOT); Mon, 11 Nov 2013 15:56:44 -0800 Received: from HQ1WP-EXHUB02.corp.brocade.com (10.70.38.14) by hq1wp-exchub02.corp.brocade.com (10.70.38.99) with Microsoft SMTP Server (TLS) id 14.3.123.3; Mon, 11 Nov 2013 15:52:28 -0800 Received: from HQ1-EXCH01.corp.brocade.com ([fe80::ed42:173e:fe7d:d0a6]) by HQ1WP-EXHUB02.corp.brocade.com ([fe80::e1f4:a4c8:696b:3780%10]) with mapi; Mon, 11 Nov 2013 15:52:28 -0800 From: ramki Krishnan To: Sriganesh Kini , Robert Raszuk Date: Mon, 11 Nov 2013 15:52:25 -0800 Thread-Topic: [Sdn] Thoughts on Defining control and Management Planes Thread-Index: Ac7fLkOh4juotzmETyWSPFGl1gK2UgACQ0og Message-ID: References: <001301ceded0$ab50b4c0$01f21e40$@riw.us> <4d2ee44e6fcb4dd18a26f8bc33c8abf1@exrad6.ad.rad.co.il> <00d201cedee5$039eaa10$0adbfe30$@riw.us> <20131111141907.GO17999@um.es> <012601cedeea$a00097b0$e001c710$@riw.us> <640DC4F7-33C2-4E24-A0D0-BB1609AE108C@cisco.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:5.10.8794, 1.0.431, 0.0.0000 definitions=2013-11-11_04:2013-11-11, 2013-11-11, 1970-01-01 signatures=0 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 suspectscore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=7.0.1-1305240000 definitions=main-1311110177 Cc: Russ White , "Carlos Pignataro \(cpignata\)" , SDN IRTF list , Pedro Martinez-Julia Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 11 Nov 2013 23:56:54 -0000 +1, completely agree. Would like to also add that a control plane functionality like BFD may be i= mplemented in the router through a hardware mechanism such as FPGA for the = purposes of linecard software offload. Thanks, Ramki -----Original Message----- From: sdn-bounces@irtf.org [mailto:sdn-bounces@irtf.org] On Behalf Of Sriga= nesh Kini Sent: Monday, November 11, 2013 2:34 PM To: Robert Raszuk Cc: Russ White; Carlos Pignataro (cpignata); SDN IRTF list; Pedro Martinez-= Julia Subject: Re: [Sdn] Thoughts on Defining control and Management Planes We seem to be using control-plane and routing-protocols as synonyms. They are not. Routing protocols are considered part of the control plane. But that does not mean that the control-plane consists only of the routing-protocols. We also seem to restrict control-plane to functionality that runs on the route-processor cards but rule out any functionality running on the line-cards. Route-processors cards and line-cards are implementation/system-architecture components whereas control and forwarding plane are functional decomposition components. BFD is control-plane functionality. So is any function (that may exist on the line-card) that builds structures that are required for forwarding a packet. This includes actions on say a BFD-down event that may take place entirely on the line-card. Forwarding-plane is just the function that is executed when a user-traffic is received. If the traffic received is control-plane traffic, then all functions executed once the packet is identified as control-plane traffic, is a part of control-plane, irrespective of whether it occurs in the line-card or route-processor-card or any other card in a system. - Sri On Mon, Nov 11, 2013 at 1:58 PM, Robert Raszuk wrote: >> It's a protocol that notifies a client, and that client can be a routing >> protocol that would modify forwarding, > > Nope ... sorry :) > > That would be way too slow. BFD notification to routing protocol is > just side product. BFD #1 goal is to notify forwarding hardware which > switches over to backup path at the line card level without *any* > action from RP. That switchover takes order of single miliseconds in > modern hardware. The detection time is the longest to react to > link/node failure. > > Note that backup paths are already pre-programmed and pre-resolved. > Only few 100s of ms later RP takes actions to correct the entries > reinstalling in make before break fashion new products of SPF and new > set of backup paths. > > Best, > R. > _______________________________________________ > sdn mailing list > sdn@irtf.org > https://www.irtf.org/mailman/listinfo/sdn _______________________________________________ sdn mailing list sdn@irtf.org https://www.irtf.org/mailman/listinfo/sdn From russw@riw.us Mon Nov 11 15:57:57 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id DFA3A21E80D0 for ; Mon, 11 Nov 2013 15:57:57 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.598 X-Spam-Level: X-Spam-Status: No, score=-2.598 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id sLg20aOlZe4R for ; Mon, 11 Nov 2013 15:57:53 -0800 (PST) Received: from server.riw.us (server.riw.us [162.144.32.236]) by ietfa.amsl.com (Postfix) with ESMTP id E4CB021E80F8 for ; Mon, 11 Nov 2013 15:57:52 -0800 (PST) Received: from [166.170.57.235] (port=9321 helo=[10.5.23.157]) by server.riw.us with esmtpa (Exim 4.80.1) (envelope-from ) id 1Vg1Mb-0008KG-8Z; Mon, 11 Nov 2013 23:57:49 +0000 MIME-Version: 1.0 To: Robert Raszuk , Yaakov Stein From: Russ White Date: Mon, 11 Nov 2013 18:57:18 -0500 Content-Type: multipart/alternative; boundary="_A72A7139-E4E1-4704-9D91-7DE78AA0BAF9_" X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server.riw.us X-AntiAbuse: Original Domain - irtf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - riw.us X-Get-Message-Sender-Via: server.riw.us: authenticated_id: russw@riw.us X-Source: X-Source-Args: X-Source-Dir: Message-Id: <20131111235752.E4CB021E80F8@ietfa.amsl.com> Cc: SDN IRTF list , Pedro Martinez-Julia Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 11 Nov 2013 23:57:58 -0000 --_A72A7139-E4E1-4704-9D91-7DE78AA0BAF9_ Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Function, not characteristics. If we consider control plane protocols "data= plane," because they carry control days (but its still data), then everyth= ing is data plane, no matter the speed, or function, or in band, or out of = band, etc. Function, not characteristic. :-) Russ -----Original Message----- From: "Robert Raszuk" Sent: =E2=80=8E11/=E2=80=8E11/=E2=80=8E2013 1:53 PM To: "Yaakov Stein" Cc: "Russ White" ; "SDN IRTF list" ; "Pedro Mar= tinez-Julia" Subject: Re: [Sdn] Thoughts on Defining control and Management Planes Indeed - I am with Yaakov here - for me BFD is also much closer to data plane then any other plane. It can run in hardware on a line cards too never even touching local or remote RP/RE where control plane resides. Likewise an interesting question could be to asked about soft-state RSVP-TE ... most will say ohhh for sure control plane .. but TE-LSP is effectively a link and link or node is really a transport for packets. So data plane is not just programming routes or flow-mods to FIB. It is also hardware as well as software which builds data plane. Same for software on the line cards .. for example FIB construction there it has really nothing to do with control plane at all. --- Actually I am not sure why we need this "plane" classification. "planes" can be drawn where we have full system - again starting from what do you want to accomplish - what service(es) you are to run. Arguing for definition of planes now seems to me pretty pointless :-) r. On Mon, Nov 11, 2013 at 6:43 PM, Yaakov Stein wrote: > No, BFD is data plane. > > Control plane protocols can be sent out-of-band; > would out-of-band BFD mean anything ? > > > > Y(J)S > > > -----Original Message----- > From: sdn-bounces@irtf.org [mailto:sdn-bounces@irtf.org] On Behalf Of Rus= s White > Sent: 11 November, 2013 16:31 > To: 'Robert Raszuk'; 'Pedro Martinez-Julia' > Cc: 'SDN IRTF list' > Subject: Re: [Sdn] Thoughts on Defining control and Management Planes > > >> How would you classify BFD running between two devices ? To which >> plane in your "very clear" model does it belong ? > > The control plane --it is a protocol which impacts the information used t= o actually forward packets. Speed doesn't matter, function does. > > :-) > > Russ > > > _______________________________________________ > sdn mailing list > sdn@irtf.org > https://www.irtf.org/mailman/listinfo/sdn _______________________________________________ sdn mailing list sdn@irtf.org https://www.irtf.org/mailman/listinfo/sdn --_A72A7139-E4E1-4704-9D91-7DE78AA0BAF9_ Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset="utf-8"

Functio= n, not characteristics. If we consider control plane protocols "data plane,= " because they carry control days (but its still data), then everything is = data plane, no matter the speed, or function, or in band, or out of band, e= tc.

Function, not characteristic.

:-)

Russ
From: Robert RaszukSent: =E2=80=8E11/=E2=80=8E11/=E2=80=8E2013 1:53 PM
To: Yaakov Stein
Russ White; SDN IRTF list; Pedro Martinez-= Julia
Subject: Re: [Sdn] Thoughts on Defining control a= nd Management Planes

Indeed - I am with Yaakov here - f= or me BFD is also much closer to
data plane then any other plane. It can= run in hardware on a line
cards too never even touching local or remote= RP/RE where control
plane resides.

Likewise an interesting quest= ion could be to asked about soft-state
RSVP-TE ... most will say ohhh fo= r sure control plane .. but TE-LSP is
effectively a link and link or nod= e is really a transport for packets.

So data plane is not just progr= amming routes or flow-mods to FIB. It
is also hardware as well as softwa= re which builds data plane.

Same for software on the line cards .. f= or example FIB construction
there it has really nothing to do with contr= ol plane at all.

---

Actually I am not sure why we need this = "plane" classification.
"planes" can be drawn where we have full system = - again starting from
what do you want to accomplish - what service(es) = you are to run.
Arguing for definition of planes now seems to me pretty = pointless :-)

r.


On Mon, Nov 11, 2013 at 6:43 PM, Yaakov = Stein <yaakov_s@rad.com> wrote:
> No, BFD is data plane.
>= ;
> Control plane protocols can be sent out-of-band;
> would ou= t-of-band BFD mean anything ?
>
>
>
> Y(J)S
>=
>
> -----Original Message-----
> From: sdn-bounces@irtf.= org [mailto:sdn-bounces@irtf.org] On Behalf Of Russ White
> Sent: 11 = November, 2013 16:31
> To: 'Robert Raszuk'; 'Pedro Martinez-Julia'> Cc: 'SDN IRTF list'
> Subject: Re: [Sdn] Thoughts on Defining c= ontrol and Management Planes
>
>
>> How would you clas= sify BFD running between two devices ? To which
>> plane in your "= very clear" model does it belong ?
>
> The control plane --it i= s a protocol which impacts the information used to actually forward packets= . Speed doesn't matter, function does.
>
> :-)
>
> = Russ
>
>
> ______________________________________________= _
> sdn mailing list
> sdn@irtf.org
> https://www.irtf.or= g/mailman/listinfo/sdn
_______________________________________________sdn mailing list
sdn@irtf.org
https://www.irtf.org/mailman/listinfo= /sdn
= --_A72A7139-E4E1-4704-9D91-7DE78AA0BAF9_-- From russw@riw.us Mon Nov 11 16:01:11 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8561921E80E9 for ; Mon, 11 Nov 2013 16:01:11 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.598 X-Spam-Level: X-Spam-Status: No, score=-2.598 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 76uaimlVGBp7 for ; Mon, 11 Nov 2013 16:01:06 -0800 (PST) Received: from server.riw.us (server.riw.us [162.144.32.236]) by ietfa.amsl.com (Postfix) with ESMTP id CA72211E812A for ; Mon, 11 Nov 2013 16:01:06 -0800 (PST) Received: from [166.170.57.235] (port=13837 helo=[10.5.23.157]) by server.riw.us with esmtpa (Exim 4.80.1) (envelope-from ) id 1Vg1Ph-0008Mw-MW; Tue, 12 Nov 2013 00:01:03 +0000 MIME-Version: 1.0 To: Robert Raszuk , Pedro Martinez-Julia From: Russ White Date: Mon, 11 Nov 2013 19:00:31 -0500 Content-Type: multipart/alternative; boundary="_9AE53B00-D4CB-4E4B-AACD-46CCAAFE1593_" X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server.riw.us X-AntiAbuse: Original Domain - irtf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - riw.us X-Get-Message-Sender-Via: server.riw.us: authenticated_id: russw@riw.us X-Source: X-Source-Args: X-Source-Dir: Message-Id: <20131112000106.CA72211E812A@ietfa.amsl.com> Cc: SDN IRTF list Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 12 Nov 2013 00:01:11 -0000 --_9AE53B00-D4CB-4E4B-AACD-46CCAAFE1593_ Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" It'd not about dividing complexity, its about dividing function. Does it ca= rry transit traffic offered to the network by something other than aneywork= device? Then its either control or management, not data.=20 Maybe attaching qualifiers to the name would help. User data Data plane control Network management=20 Does that gel? :-) Russ -----Original Message----- From: "Robert Raszuk" Sent: =E2=80=8E11/=E2=80=8E11/=E2=80=8E2013 2:18 PM To: "Pedro Martinez-Julia" Cc: "SDN IRTF list" Subject: Re: [Sdn] Thoughts on Defining control and Management Planes Hi Pedro, > I think you are attributing so much to data plane. Data plane should > just have functions that do not analyze the content of packets, i.e. > functions that just decide to forward (or not) a packet and to which > port it should be forwarded. I think you on the other hand vastly underestimate it. Decision on where to forward the packet, how to decapsulate and encapsulate it, decision about ECMP forwarding using physical and virtual links, building FIB hierarchy all require sometimes complex and time optimized code as well as do need deep analysis of the content of the packet. What you sort of describe is of 1.0 definition ... and that's why its of little use for practical applications. Best, R. _______________________________________________ sdn mailing list sdn@irtf.org https://www.irtf.org/mailman/listinfo/sdn --_9AE53B00-D4CB-4E4B-AACD-46CCAAFE1593_ Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset="utf-8"

It'd no= t about dividing complexity, its about dividing function. Does it carry tra= nsit traffic offered to the network by something other than aneywork device= ? Then its either control or management, not data.

Maybe attaching = qualifiers to the name would help.

User data
Data plane controlNetwork management

Does that gel?

:-)

Russ
From: Robert RaszukSent: =E2=80=8E11/=E2=80=8E11/=E2=80=8E2013 2:18 PM
To: Pedro Martinez-Julia
Cc: SDN IRTF list
Re: [Sdn] Thoughts on Defining control and Management Planes=

Hi Pedro,

> I think you are attributing so much to = data plane. Data plane should
> just have functions that do not analy= ze the content of packets, i.e.
> functions that just decide to forwa= rd (or not) a packet and to which
> port it should be forwarded.
<= BR>I think you on the other hand vastly underestimate it.

Decision o= n where to forward the packet, how to decapsulate and
encapsulate it, de= cision about ECMP forwarding using physical and
virtual links, building = FIB hierarchy all require sometimes complex
and time optimized code as w= ell as do need deep analysis of the
content of the packet.

What y= ou sort of describe is of 1.0 definition ... and that's why its
of littl= e use for practical applications.

Best,
R.
___________________= ____________________________
sdn mailing list
sdn@irtf.org
https:/= /www.irtf.org/mailman/listinfo/sdn
= --_9AE53B00-D4CB-4E4B-AACD-46CCAAFE1593_-- From russw@riw.us Mon Nov 11 16:04:57 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3ACAA21E8137 for ; Mon, 11 Nov 2013 16:04:57 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.598 X-Spam-Level: X-Spam-Status: No, score=-2.598 tagged_above=-999 required=5 tests=[AWL=-0.000, BAYES_00=-2.599, HTML_MESSAGE=0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id u8GFREv0DvSc for ; Mon, 11 Nov 2013 16:04:52 -0800 (PST) Received: from server.riw.us (server.riw.us [162.144.32.236]) by ietfa.amsl.com (Postfix) with ESMTP id 6FC8921E80D0 for ; Mon, 11 Nov 2013 16:04:52 -0800 (PST) Received: from [166.170.57.235] (port=46717 helo=[10.5.23.157]) by server.riw.us with esmtpa (Exim 4.80.1) (envelope-from ) id 1Vg1TO-0008Ow-MV; Tue, 12 Nov 2013 00:04:50 +0000 MIME-Version: 1.0 To: "Carlos Pignataro (cpignata)" From: Russ White Date: Mon, 11 Nov 2013 19:04:20 -0500 Content-Type: multipart/alternative; boundary="_A8A2EDE2-9473-439A-B238-1F40A9CA4CF8_" X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server.riw.us X-AntiAbuse: Original Domain - irtf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - riw.us X-Get-Message-Sender-Via: server.riw.us: authenticated_id: russw@riw.us X-Source: X-Source-Args: X-Source-Dir: Message-Id: <20131112000452.6FC8921E80D0@ietfa.amsl.com> Cc: SDN IRTF list , Pedro Martinez-Julia , Robert Raszuk Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 12 Nov 2013 00:04:57 -0000 --_A8A2EDE2-9473-439A-B238-1F40A9CA4CF8_ Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Not necessarily. It's a protocol that notifies a client, and that client ca= n be a routing protocol that would modify forwarding, or the client can be = a notification to an NMS that will log it without impact to forwarding. The= client can event be just a stub with no "action". Maybe BFD is plane-less = :-) =3D=3D It notifies a client which then modifies the forwarding information... If w= e include everything that might eventually touch the forwarding information= , then everything us data plane, including CPU thermals (since the CPU nigh= t overheat, causing the box to shut down, which has a definite impact on th= e data plane). If you do this, you have no interfaces, and interfaces are where the defini= tion needs to be clear. :-) Russ -----Original Message----- From: "Carlos Pignataro (cpignata)" Sent: =E2=80=8E11/=E2=80=8E11/=E2=80=8E2013 4:52 PM To: "Russ White" Cc: "Robert Raszuk" ; "Pedro Martinez-Julia" ; "SDN IRTF list" Subject: Re: [Sdn] Thoughts on Defining control and Management Planes On Nov 11, 2013, at 9:30 AM, Russ White wrote: >=20 >> How would you classify BFD running between two devices ? To which plane >> in your "very clear" model does it belong ? >=20 > The control plane --it is a protocol which impacts the information used t= o > actually forward packets. Not necessarily. It's a protocol that notifies a client, and that client ca= n be a routing protocol that would modify forwarding, or the client can be = a notification to an NMS that will log it without impact to forwarding. The= client can event be just a stub with no "action". Maybe BFD is plane-less = :-) Seems like BFD is executing a fault management function, triggering control= planes and management planes. I am not sure this makes a huge difference i= n any case :-) > Speed doesn't matter, function does. >=20 That I agree with. -- Carlos. > :-) >=20 > Russ >=20 >=20 > _______________________________________________ > sdn mailing list > sdn@irtf.org > https://www.irtf.org/mailman/listinfo/sdn --_A8A2EDE2-9473-439A-B238-1F40A9CA4CF8_ Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset="utf-8"

Not nec= essarily. It's a protocol that notifies a client, and that client can be a = routing protocol that would modify forwarding, or the client can be a notif= ication to an NMS that will log it without impact to forwarding. The client= can event be just a stub with no "action". Maybe BFD is plane-less :-)
= =3D=3D

It notifies a client which then modifies the forwarding infor= mation... If we include everything that might eventually touch the forwardi= ng information, then everything us data plane, including CPU thermals (sinc= e the CPU night overheat, causing the box to shut down, which has a definit= e impact on the data plane).

If you do this, you have no interfaces,= and interfaces are where the definition needs to be clear.

:-)
<= BR>Russ
From: Carlos Pignataro (cpignat= a)
Sent: =E2=80=8E11/=E2=80=8E11/=E2=80=8E2013 4:52 PM<= /SPAN>
To: Russ WhiteCc: Robert Raszuk; Pedro Martinez-Julia; SDN IRTF list
Subject: Re: [Sdn] Thoughts on= Defining control and Management Planes


On Nov 11, = 2013, at 9:30 AM, Russ White <russw@riw.us> wrote:

>
&g= t;> How would you classify BFD running between two devices ? To which pl= ane
>> in your "very clear" model does it belong ?
>
>= ; The control plane --it is a protocol which impacts the information used t= o
> actually forward packets.

Not necessarily. It's a protocol= that notifies a client, and that client can be a routing protocol that wou= ld modify forwarding, or the client can be a notification to an NMS that wi= ll log it without impact to forwarding. The client can event be just a stub= with no "action". Maybe BFD is plane-less :-)

Seems like BFD is exe= cuting a fault management function, triggering control planes and managemen= t planes. I am not sure this makes a huge difference in any case :-)
> Speed doesn't matter, function does.
>

That I agree wit= h.

-- Carlos.

> :-)
>
> Russ
>
>=
> _______________________________________________
> sdn maili= ng list
> sdn@irtf.org
> https://www.irtf.org/mailman/listinfo/= sdn

= --_A8A2EDE2-9473-439A-B238-1F40A9CA4CF8_-- From cpignata@cisco.com Mon Nov 11 16:40:46 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D6E5C11E812A for ; Mon, 11 Nov 2013 16:40:45 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -110.302 X-Spam-Level: X-Spam-Status: No, score=-110.302 tagged_above=-999 required=5 tests=[AWL=0.297, BAYES_00=-2.599, RCVD_IN_DNSWL_HI=-8, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id rfBf6mqQLwWo for ; Mon, 11 Nov 2013 16:40:41 -0800 (PST) Received: from rcdn-iport-2.cisco.com (rcdn-iport-2.cisco.com [173.37.86.73]) by ietfa.amsl.com (Postfix) with ESMTP id AAD0611E8151 for ; Mon, 11 Nov 2013 16:40:36 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=3628; q=dns/txt; s=iport; t=1384216836; x=1385426436; h=from:to:cc:subject:date:message-id:references: in-reply-to:mime-version; bh=eKGIzlmR8G8kaTgNGj30xjJyrNNa8iYQln5ye1t8cEs=; b=DMnz9O5Oh3dyF1n8yzMKw2KbqrtKDW/GbuKzq8zx0//57IZxG+m9YTpv FIgG8YHQ5O2JQ67T9K2qO7yaffpw6SZnL5wh34XkcCclp+0Mv2xrVCf2v /TXcJ2wj9IX6v8IONviexpCYAInZYH0+PJv2sTNJzjQsBjR+ST7N1QgoI 0=; X-Files: signature.asc : 203 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AhIFAKt4gVKtJXG9/2dsb2JhbABZgwc4U78bgT8WdIIlAQEBAwEBAQFrCwULAgEIEgYuJwsXDgIEDgUOh20GDb5IjhGBUgeDIIEQA5AwgTCCToNhgS+QW4Mmgio X-IronPort-AV: E=Sophos;i="4.93,680,1378857600"; d="asc'?scan'208";a="283419056" Received: from rcdn-core2-2.cisco.com ([173.37.113.189]) by rcdn-iport-2.cisco.com with ESMTP; 12 Nov 2013 00:40:34 +0000 Received: from xhc-rcd-x05.cisco.com (xhc-rcd-x05.cisco.com [173.37.183.79]) by rcdn-core2-2.cisco.com (8.14.5/8.14.5) with ESMTP id rAC0eXUh005382 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Tue, 12 Nov 2013 00:40:33 GMT Received: from xmb-aln-x02.cisco.com ([169.254.5.229]) by xhc-rcd-x05.cisco.com ([173.37.183.79]) with mapi id 14.03.0123.003; Mon, 11 Nov 2013 18:40:33 -0600 From: "Carlos Pignataro (cpignata)" To: Sriganesh Kini Thread-Topic: [Sdn] Thoughts on Defining control and Management Planes Thread-Index: AQHO2xqrwFWjJHD27EiGosxotvsH6ZoZhQKAgADYuwCABdNIAIAAHq4AgAAjTgCAAAVjgIAAB/KAgAACtoCAAACRgIAAe0sAgAAB0oCAAAoCAIAAIziA Date: Tue, 12 Nov 2013 00:40:32 +0000 Message-ID: <4D6BF497-AA24-4E5B-AC0C-DF8FB56B4759@cisco.com> References: <001301ceded0$ab50b4c0$01f21e40$@riw.us> <4d2ee44e6fcb4dd18a26f8bc33c8abf1@exrad6.ad.rad.co.il> <00d201cedee5$039eaa10$0adbfe30$@riw.us> <20131111141907.GO17999@um.es> <012601cedeea$a00097b0$e001c710$@riw.us> <640DC4F7-33C2-4E24-A0D0-BB1609AE108C@cisco.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: x-originating-ip: [10.82.218.33] Content-Type: multipart/signed; boundary="Apple-Mail=_E671504D-DF43-4C6D-A12A-837BAC0CABE3"; protocol="application/pgp-signature"; micalg=pgp-sha1 MIME-Version: 1.0 Cc: Russ White , SDN IRTF list , Pedro Martinez-Julia , Robert Raszuk Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 12 Nov 2013 00:40:46 -0000 --Apple-Mail=_E671504D-DF43-4C6D-A12A-837BAC0CABE3 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii Sri, On Nov 11, 2013, at 5:34 PM, Sriganesh Kini = wrote: > We seem to be using control-plane and routing-protocols as synonyms. > They are not. Routing protocols are considered part of the control > plane. But that does not mean that the control-plane consists only of > the routing-protocols. >=20 > We also seem to restrict control-plane to functionality that runs on > the route-processor cards but rule out any functionality running on > the line-cards. Route-processors cards and line-cards are > implementation/system-architecture components whereas control and > forwarding plane are functional decomposition components. >=20 +1. I very much agree with these two paragraphs. > BFD is control-plane functionality. So is any function (that may exist > on the line-card) that builds structures that are required for > forwarding a packet. Here I disagree. BFD performs fault management for the forwarding plane. = It is, by design, decoupled from the control plane (it even has the "C" = bit for "Control Plane Independent").=20 http://tools.ietf.org/html/rfc5880#section-2 > This includes actions on say a BFD-down event > that may take place entirely on the line-card. Forwarding-plane is > just the function that is executed when a user-traffic is received. If > the traffic received is control-plane traffic, then all functions > executed once the packet is identified as control-plane traffic, is a > part of control-plane, irrespective of whether it occurs in the > line-card or route-processor-card or any other card in a system. >=20 BFD can signal to a control plane -- or not. But in itself is not part = of the control plane, IMHO. Thanks, - Carlos. > - Sri >=20 >=20 > On Mon, Nov 11, 2013 at 1:58 PM, Robert Raszuk = wrote: >>> It's a protocol that notifies a client, and that client can be a = routing >>> protocol that would modify forwarding, >>=20 >> Nope ... sorry :) >>=20 >> That would be way too slow. BFD notification to routing protocol is >> just side product. BFD #1 goal is to notify forwarding hardware which >> switches over to backup path at the line card level without *any* >> action from RP. That switchover takes order of single miliseconds in >> modern hardware. The detection time is the longest to react to >> link/node failure. >>=20 >> Note that backup paths are already pre-programmed and pre-resolved. >> Only few 100s of ms later RP takes actions to correct the entries >> reinstalling in make before break fashion new products of SPF and new >> set of backup paths. >>=20 >> Best, >> R. >> _______________________________________________ >> sdn mailing list >> sdn@irtf.org >> https://www.irtf.org/mailman/listinfo/sdn > _______________________________________________ > sdn mailing list > sdn@irtf.org > https://www.irtf.org/mailman/listinfo/sdn --Apple-Mail=_E671504D-DF43-4C6D-A12A-837BAC0CABE3 Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename="signature.asc" Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Message signed with OpenPGP using GPGMail -----BEGIN PGP SIGNATURE----- Comment: GPGTools - http://gpgtools.org iEYEARECAAYFAlKBeP8ACgkQtfDPGTp3USxf5QCfbgYDi1XYcPqbQuTMD+wXyrOJ 5FAAnR2y7eYSpxd8HhaG0xK9g1DT+e8X =HRsX -----END PGP SIGNATURE----- --Apple-Mail=_E671504D-DF43-4C6D-A12A-837BAC0CABE3-- From sriganeshkini@gmail.com Mon Nov 11 17:31:52 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B867911E81DE for ; Mon, 11 Nov 2013 17:31:52 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.978 X-Spam-Level: X-Spam-Status: No, score=-1.978 tagged_above=-999 required=5 tests=[AWL=-0.000, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id hnKfs5eHKDEO for ; Mon, 11 Nov 2013 17:31:52 -0800 (PST) Received: from mail-pd0-x233.google.com (mail-pd0-x233.google.com [IPv6:2607:f8b0:400e:c02::233]) by ietfa.amsl.com (Postfix) with ESMTP id C9C0E11E819A for ; Mon, 11 Nov 2013 17:31:47 -0800 (PST) Received: by mail-pd0-f179.google.com with SMTP id y10so5980300pdj.38 for ; Mon, 11 Nov 2013 17:31:47 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:from:date:message-id :subject:to:cc:content-type; bh=/R0NMmleICv24b2sBnxTvyhOzEtBZxfcpsZtpign2tU=; b=hO7uk/dlxXyIucA7BimOJgM+83mOeOcoT7ZrizTqQKANe0i0H1Qu/jCSVRg4flwg02 poFfcE7rZBCqtVfjcmlCVYrKBs/5lS8u4jBkAjarF7BkPqiWbfB0g2RmhuOa6OvX9kon FpoUC7PzFQlOkhzTJnqMn/8fU+YMZlhhbRohQipKtF6eG07sBu4pGv11/ygI79Uu9+xQ Hi0M2jxFZKf1VGiNDG9mPdJLlbT1c/r4U3HsRFsSoa/KqOb5g3oGIWhSrelpeDCOknfA YCliS9Shl1ufL7cH1mRWgC/IA+TE+l0mp8zGOpAvbpmY9JPBxbk0iUBK3NSHh9C2AGwr 58/w== X-Received: by 10.66.196.168 with SMTP id in8mr33285616pac.18.1384219907304; Mon, 11 Nov 2013 17:31:47 -0800 (PST) MIME-Version: 1.0 Sender: sriganeshkini@gmail.com Received: by 10.70.0.228 with HTTP; Mon, 11 Nov 2013 17:31:16 -0800 (PST) In-Reply-To: <4D6BF497-AA24-4E5B-AC0C-DF8FB56B4759@cisco.com> References: <001301ceded0$ab50b4c0$01f21e40$@riw.us> <4d2ee44e6fcb4dd18a26f8bc33c8abf1@exrad6.ad.rad.co.il> <00d201cedee5$039eaa10$0adbfe30$@riw.us> <20131111141907.GO17999@um.es> <012601cedeea$a00097b0$e001c710$@riw.us> <640DC4F7-33C2-4E24-A0D0-BB1609AE108C@cisco.com> <4D6BF497-AA24-4E5B-AC0C-DF8FB56B4759@cisco.com> From: Sriganesh Kini Date: Mon, 11 Nov 2013 17:31:16 -0800 X-Google-Sender-Auth: 9ijigJbmdyV1GGXfhrKw_M8xL0I Message-ID: To: "Carlos Pignataro (cpignata)" Content-Type: text/plain; charset=UTF-8 Cc: Russ White , SDN IRTF list , Robert Raszuk , Pedro Martinez-Julia Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 12 Nov 2013 01:31:52 -0000 Carlos, see inline On Mon, Nov 11, 2013 at 4:40 PM, Carlos Pignataro (cpignata) wrote: > Sri, > > On Nov 11, 2013, at 5:34 PM, Sriganesh Kini wrote: > >> We seem to be using control-plane and routing-protocols as synonyms. >> They are not. Routing protocols are considered part of the control >> plane. But that does not mean that the control-plane consists only of >> the routing-protocols. >> >> We also seem to restrict control-plane to functionality that runs on >> the route-processor cards but rule out any functionality running on >> the line-cards. Route-processors cards and line-cards are >> implementation/system-architecture components whereas control and >> forwarding plane are functional decomposition components. >> > > +1. > > I very much agree with these two paragraphs. > >> BFD is control-plane functionality. So is any function (that may exist >> on the line-card) that builds structures that are required for >> forwarding a packet. > > Here I disagree. BFD performs fault management for the forwarding plane. It is, by design, decoupled from the control plane (it even has the "C" bit for "Control Plane Independent"). > > http://tools.ietf.org/html/rfc5880#section-2 BFD performs fault-notification (not management) so that other entities can perform useful actions to recover from faults. This even includes notification to human operators. But mainly it is for the control-plane so that it can perform the necessary actions so that forwarding plane only drops as few packets as possible. A good system-design decouples BFD fate from the route-processor (not the control-plane). If BFD was always decoupled from the "control-plane" there wouldn't even be a need to have the C-bit :-) The C-bit was introduced because some older implementations at that time had BFD fate-shared with the routing-protocol fate (due to BFD running on the route-processor) and there was a need to distinguish it from newer BFD implementations that were not fate-shared with the routing-protocol fate (due to BFD running on the line-card). The real requirement was to disentangle BFD and GR state. Note that when C-bit is not set there is risk of undetected failures as explained in RFC5880 sec 4.3.2. Strictly speaking, the BFD C-bit being called control-plane-independent is a misnomer since it wasn't the control-plane independence but rather the independence from routing-protocol fate (especially when routing-protocol is in GR state) that was being expressed. To be blunt there was a need to prevent the far-end of an older implementation from performing recovery actions when reloading the route-processor, restarting processes etc, and an unset C-bit was deployed only after accepting the risks as described in RFC5880 sec 4.3.2. - Sri > > >> This includes actions on say a BFD-down event >> that may take place entirely on the line-card. Forwarding-plane is >> just the function that is executed when a user-traffic is received. If >> the traffic received is control-plane traffic, then all functions >> executed once the packet is identified as control-plane traffic, is a >> part of control-plane, irrespective of whether it occurs in the >> line-card or route-processor-card or any other card in a system. >> > > BFD can signal to a control plane -- or not. But in itself is not part of the control plane, IMHO. > > Thanks, > > - Carlos. > > >> - Sri >> >> >> On Mon, Nov 11, 2013 at 1:58 PM, Robert Raszuk wrote: >>>> It's a protocol that notifies a client, and that client can be a routing >>>> protocol that would modify forwarding, >>> >>> Nope ... sorry :) >>> >>> That would be way too slow. BFD notification to routing protocol is >>> just side product. BFD #1 goal is to notify forwarding hardware which >>> switches over to backup path at the line card level without *any* >>> action from RP. That switchover takes order of single miliseconds in >>> modern hardware. The detection time is the longest to react to >>> link/node failure. >>> >>> Note that backup paths are already pre-programmed and pre-resolved. >>> Only few 100s of ms later RP takes actions to correct the entries >>> reinstalling in make before break fashion new products of SPF and new >>> set of backup paths. >>> >>> Best, >>> R. >>> _______________________________________________ >>> sdn mailing list >>> sdn@irtf.org >>> https://www.irtf.org/mailman/listinfo/sdn >> _______________________________________________ >> sdn mailing list >> sdn@irtf.org >> https://www.irtf.org/mailman/listinfo/sdn > > > _______________________________________________ > sdn mailing list > sdn@irtf.org > https://www.irtf.org/mailman/listinfo/sdn > From cpignata@cisco.com Mon Nov 11 18:23:53 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 156CC21E8113 for ; Mon, 11 Nov 2013 18:23:53 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -110.313 X-Spam-Level: X-Spam-Status: No, score=-110.313 tagged_above=-999 required=5 tests=[AWL=0.286, BAYES_00=-2.599, RCVD_IN_DNSWL_HI=-8, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Ic0QfVZ35zy6 for ; Mon, 11 Nov 2013 18:23:48 -0800 (PST) Received: from rcdn-iport-4.cisco.com (rcdn-iport-4.cisco.com [173.37.86.75]) by ietfa.amsl.com (Postfix) with ESMTP id 0C14721E8146 for ; Mon, 11 Nov 2013 18:23:44 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=7654; q=dns/txt; s=iport; t=1384223024; x=1385432624; h=from:to:cc:subject:date:message-id:references: in-reply-to:mime-version; bh=qBXkaX221krTpm9flvyi285C81+TezDOo24fH/1P4Oo=; b=Lk1AzaiC6QTUdpLMg8aKsltkSjgfSstIHtwFtnyJ0sovpz4JcLRlCJjY eas3/+7W1Kc3ApCJpqIYTiTF/kl2HZbMTk/c2nhy4N6+qU7U7XRypmHkw 6FMloKxzpYLTUkGAvou1eYk/bZITyUWmRPiQrGZJ1f5GNhoBzsE2BrU5J s=; X-Files: signature.asc : 203 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: Ag4FACKQgVKtJXHA/2dsb2JhbABZgwc4U78bgUIWdIIlAQEBAwEBAQFrCwULAgEIEgYuJwsXDgIEDgUOh20GDb48jgiBUgeDIIEQA5AwgTCCToNhgS+QW4Mmgio X-IronPort-AV: E=Sophos;i="4.93,681,1378857600"; d="asc'?scan'208";a="283560356" Received: from rcdn-core2-5.cisco.com ([173.37.113.192]) by rcdn-iport-4.cisco.com with ESMTP; 12 Nov 2013 02:23:43 +0000 Received: from xhc-rcd-x11.cisco.com (xhc-rcd-x11.cisco.com [173.37.183.85]) by rcdn-core2-5.cisco.com (8.14.5/8.14.5) with ESMTP id rAC2NgFO028072 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Tue, 12 Nov 2013 02:23:42 GMT Received: from xmb-aln-x02.cisco.com ([169.254.5.229]) by xhc-rcd-x11.cisco.com ([173.37.183.85]) with mapi id 14.03.0123.003; Mon, 11 Nov 2013 20:23:42 -0600 From: "Carlos Pignataro (cpignata)" To: Sriganesh Kini Thread-Topic: [Sdn] Thoughts on Defining control and Management Planes Thread-Index: AQHO2xqrwFWjJHD27EiGosxotvsH6ZoZhQKAgADYuwCABdNIAIAAHq4AgAAjTgCAAAVjgIAAB/KAgAACtoCAAACRgIAAe0sAgAAB0oCAAAoCAIAAIziAgAAOLgCAAA6kAA== Date: Tue, 12 Nov 2013 02:23:42 +0000 Message-ID: <5E5AEAFC-FFC2-4917-A243-CFC3F121ACA6@cisco.com> References: <001301ceded0$ab50b4c0$01f21e40$@riw.us> <4d2ee44e6fcb4dd18a26f8bc33c8abf1@exrad6.ad.rad.co.il> <00d201cedee5$039eaa10$0adbfe30$@riw.us> <20131111141907.GO17999@um.es> <012601cedeea$a00097b0$e001c710$@riw.us> <640DC4F7-33C2-4E24-A0D0-BB1609AE108C@cisco.com> <4D6BF497-AA24-4E5B-AC0C-DF8FB56B4759@cisco.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: x-originating-ip: [10.82.218.33] Content-Type: multipart/signed; boundary="Apple-Mail=_0AF8622E-F2F8-4797-B8F3-ECA99E741275"; protocol="application/pgp-signature"; micalg=pgp-sha1 MIME-Version: 1.0 Cc: Russ White , SDN IRTF list , Robert Raszuk , Pedro Martinez-Julia Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 12 Nov 2013 02:23:53 -0000 --Apple-Mail=_0AF8622E-F2F8-4797-B8F3-ECA99E741275 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii Hi, Sri, Interesting useful conversation :-) We may be on a tangent, except for = supporting the fact that the definition of terms for these Planes is = fuzzy and not so clear... Please see inline. On Nov 11, 2013, at 8:31 PM, Sriganesh Kini = wrote: > Carlos, see inline >=20 > On Mon, Nov 11, 2013 at 4:40 PM, Carlos Pignataro (cpignata) > wrote: >> Sri, >>=20 >> On Nov 11, 2013, at 5:34 PM, Sriganesh Kini = wrote: >>=20 >>> We seem to be using control-plane and routing-protocols as synonyms. >>> They are not. Routing protocols are considered part of the control >>> plane. But that does not mean that the control-plane consists only = of >>> the routing-protocols. >>>=20 >>> We also seem to restrict control-plane to functionality that runs on >>> the route-processor cards but rule out any functionality running on >>> the line-cards. Route-processors cards and line-cards are >>> implementation/system-architecture components whereas control and >>> forwarding plane are functional decomposition components. >>>=20 >>=20 >> +1. >>=20 >> I very much agree with these two paragraphs. >>=20 >>> BFD is control-plane functionality. So is any function (that may = exist >>> on the line-card) that builds structures that are required for >>> forwarding a packet. >>=20 >> Here I disagree. BFD performs fault management for the forwarding = plane. It is, by design, decoupled from the control plane (it even has = the "C" bit for "Control Plane Independent"). >>=20 >> http://tools.ietf.org/html/rfc5880#section-2 >=20 > BFD performs fault-notification (not management) so that other > entities can perform useful actions to recover from faults. ... or not. Specifically, where does it say "so that other entities can = perform useful actions to recover from faults"? Can you please provide a = pointer? I do realize that recovery from faults is a common useful goal. However, = BFD performs fault *detection* (not notification), a subset of fault = management, but not "in order to recover" necessarily. A perfectly valid = use of BFD is to trigger a log or notification (not an action to = recover). Less useful, sure (depending the case). Valid, yes as well. The Abstract of bfd-base is quite unambiguous: Abstract This document describes a protocol intended to detect faults in the bidirectional path between two forwarding engines, including interfaces, data link(s), and to the extent possible the forwarding engines themselves, with potentially very low latency. It operates independently of media, data protocols, and routing protocols. BFD, intended to detect forwarding plane faults, AKA fault detection. = BFD is part of the IETF's OAM toolset. > This even > includes notification to human operators. But mainly it is for the > control-plane so that it can perform the necessary actions so that > forwarding plane only drops as few packets as possible. Mainly? My only point is that from a functional perspective, BFD is not = data plane and not control plane. It detects data plane failures and = (typically, yet not necessarily) informs the control plane. The "D" in = BFD for detection, it's not "R" for Restoration/Recovery. BFD does = interact with control protocols for recovery. > A good > system-design decouples BFD fate from the route-processor (not the > control-plane). If BFD was always decoupled from the "control-plane" > there wouldn't even be a need to have the C-bit :-) >=20 > The C-bit was introduced because some older implementations at that > time had BFD fate-shared with the routing-protocol fate (due to BFD > running on the route-processor) and there was a need to distinguish it > from newer BFD implementations that were not fate-shared with the > routing-protocol fate (due to BFD running on the line-card). The real > requirement was to disentangle BFD and GR state. Note that when C-bit > is not set there is risk of undetected failures as explained in > RFC5880 sec 4.3.2. Strictly speaking, the BFD C-bit being called > control-plane-independent is a misnomer since it wasn't the > control-plane independence but rather the independence from > routing-protocol fate (especially when routing-protocol is in GR > state) that was being expressed. To be blunt there was a need to > prevent the far-end of an older implementation from performing > recovery actions when reloading the route-processor, restarting > processes etc, and an unset C-bit was deployed only after accepting > the risks as described in RFC5880 sec 4.3.2. >=20 Yes, should be called 'GR routing-protocol independent" -- with the only = nit that this is actually in RFC 5882 (not 5880) Section 4.3.2. Thanks, -- Carlos. > - Sri >=20 >>=20 >>=20 >>> This includes actions on say a BFD-down event >>> that may take place entirely on the line-card. Forwarding-plane is >>> just the function that is executed when a user-traffic is received. = If >>> the traffic received is control-plane traffic, then all functions >>> executed once the packet is identified as control-plane traffic, is = a >>> part of control-plane, irrespective of whether it occurs in the >>> line-card or route-processor-card or any other card in a system. >>>=20 >>=20 >> BFD can signal to a control plane -- or not. But in itself is not = part of the control plane, IMHO. >>=20 >> Thanks, >>=20 >> - Carlos. >>=20 >>=20 >>> - Sri >>>=20 >>>=20 >>> On Mon, Nov 11, 2013 at 1:58 PM, Robert Raszuk = wrote: >>>>> It's a protocol that notifies a client, and that client can be a = routing >>>>> protocol that would modify forwarding, >>>>=20 >>>> Nope ... sorry :) >>>>=20 >>>> That would be way too slow. BFD notification to routing protocol is >>>> just side product. BFD #1 goal is to notify forwarding hardware = which >>>> switches over to backup path at the line card level without *any* >>>> action from RP. That switchover takes order of single miliseconds = in >>>> modern hardware. The detection time is the longest to react to >>>> link/node failure. >>>>=20 >>>> Note that backup paths are already pre-programmed and pre-resolved. >>>> Only few 100s of ms later RP takes actions to correct the entries >>>> reinstalling in make before break fashion new products of SPF and = new >>>> set of backup paths. >>>>=20 >>>> Best, >>>> R. >>>> _______________________________________________ >>>> sdn mailing list >>>> sdn@irtf.org >>>> https://www.irtf.org/mailman/listinfo/sdn >>> _______________________________________________ >>> sdn mailing list >>> sdn@irtf.org >>> https://www.irtf.org/mailman/listinfo/sdn >>=20 >>=20 >> _______________________________________________ >> sdn mailing list >> sdn@irtf.org >> https://www.irtf.org/mailman/listinfo/sdn >>=20 --Apple-Mail=_0AF8622E-F2F8-4797-B8F3-ECA99E741275 Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename="signature.asc" Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Message signed with OpenPGP using GPGMail -----BEGIN PGP SIGNATURE----- Comment: GPGTools - http://gpgtools.org iEYEARECAAYFAlKBkSwACgkQtfDPGTp3USx5kgCeL9F83h3lnMhcM/d1gXX6OXAm 5vUAmwb0l721Oz3ZssiYDCeoVvRraoo4 =q5xh -----END PGP SIGNATURE----- --Apple-Mail=_0AF8622E-F2F8-4797-B8F3-ECA99E741275-- From sriganeshkini@gmail.com Mon Nov 11 23:52:31 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3D0A311E81D5 for ; Mon, 11 Nov 2013 23:52:31 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.978 X-Spam-Level: X-Spam-Status: No, score=-1.978 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 28jCsWGZEenr for ; Mon, 11 Nov 2013 23:52:30 -0800 (PST) Received: from mail-pa0-x22a.google.com (mail-pa0-x22a.google.com [IPv6:2607:f8b0:400e:c03::22a]) by ietfa.amsl.com (Postfix) with ESMTP id 6850511E819B for ; Mon, 11 Nov 2013 23:52:30 -0800 (PST) Received: by mail-pa0-f42.google.com with SMTP id kp14so6187425pab.29 for ; Mon, 11 Nov 2013 23:52:30 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:from:date:message-id :subject:to:cc:content-type:content-transfer-encoding; bh=MZhYORorw8nQvkBcGu99VQznU0nOe8rzJHOHCkXWFvM=; b=eHHzkEaANFyjkiNJHcF7/OQrImP4IxyExA8jpGDcFuDfM5xEbOp5fVObGVwUVum7Bp uGlDT0Omg8YZxpoQGxsTkWdw6ehB6hiw/7Px5ukzNtGBOCBAImA/M88+nWAwAaHwbCNR 3dDva2sOgFohtyMPbhXIt6PPWVJeklFx5cenxUKgbeT9nSYHYlFtLKXoEEOWallgF3ez t8Glykrn8CI/LpgQdKfy6o0k8KU4SYyNMzUxJ1kP9YJPHVYwTWGEn7YrclVEAB89UXEk qih32elIjM8YLfX2qS+7u2qDpHyC8CPBfLmKSN+ahaamC8E53GXIIB48oCoYde4MTRKb dO2w== X-Received: by 10.66.27.9 with SMTP id p9mr8530492pag.65.1384242750107; Mon, 11 Nov 2013 23:52:30 -0800 (PST) MIME-Version: 1.0 Sender: sriganeshkini@gmail.com Received: by 10.70.0.228 with HTTP; Mon, 11 Nov 2013 23:52:00 -0800 (PST) In-Reply-To: <5E5AEAFC-FFC2-4917-A243-CFC3F121ACA6@cisco.com> References: <001301ceded0$ab50b4c0$01f21e40$@riw.us> <4d2ee44e6fcb4dd18a26f8bc33c8abf1@exrad6.ad.rad.co.il> <00d201cedee5$039eaa10$0adbfe30$@riw.us> <20131111141907.GO17999@um.es> <012601cedeea$a00097b0$e001c710$@riw.us> <640DC4F7-33C2-4E24-A0D0-BB1609AE108C@cisco.com> <4D6BF497-AA24-4E5B-AC0C-DF8FB56B4759@cisco.com> <5E5AEAFC-FFC2-4917-A243-CFC3F121ACA6@cisco.com> From: Sriganesh Kini Date: Mon, 11 Nov 2013 23:52:00 -0800 X-Google-Sender-Auth: pCXwsGzsHI-kQ1HKPOo32MFfuyE Message-ID: To: "Carlos Pignataro (cpignata)" Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Cc: Russ White , SDN IRTF list , Pedro Martinez-Julia , Robert Raszuk Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 12 Nov 2013 07:52:31 -0000 Hi Carlos, see inline. On Mon, Nov 11, 2013 at 6:23 PM, Carlos Pignataro (cpignata) wrote: > Hi, Sri, > > Interesting useful conversation :-) We may be on a tangent, except for su= pporting the fact that the definition of terms for these Planes is fuzzy an= d not so clear... Please see inline. I don't believe the definitions are fuzzy. I hope they are becoming clearer through this useful conversation. > > On Nov 11, 2013, at 8:31 PM, Sriganesh Kini = wrote: [snip] >>> >>>> BFD is control-plane functionality. So is any function (that may exist >>>> on the line-card) that builds structures that are required for >>>> forwarding a packet. >>> >>> Here I disagree. BFD performs fault management for the forwarding plane= . It is, by design, decoupled from the control plane (it even has the "C" b= it for "Control Plane Independent"). >>> >>> http://tools.ietf.org/html/rfc5880#section-2 >> >> BFD performs fault-notification (not management) so that other >> entities can perform useful actions to recover from faults. > > ... or not. Specifically, where does it say "so that other entities can p= erform useful actions to recover from faults"? Can you please provide a poi= nter? Maybe not in those words but if you see RFC 5882 intro "...provides a liveness detection mechanism that can be utilized by other network components for which their integral liveness mechanisms are either too slow, inappropriate, or nonexistent". Those other network components perform actions to recover from faults. > > I do realize that recovery from faults is a common useful goal. However, = BFD performs fault *detection* (not notification), a subset of fault manage= ment, but not "in order to recover" necessarily. A perfectly valid use of B= FD is to trigger a log or notification (not an action to recover). Less use= ful, sure (depending the case). Valid, yes as well. Note that in your use-case too you used ".. to trigger a log or notification". The purpose of these is also to do a recovery. This recovery may not be your sub-50msec switchover type of recovery. It could be a "send a line-man to check if/why the fiber is broken and fix it" or "re-engineer traffic to take into account this broken link" kind of network recovery. But it is a form of recovery action. > > The Abstract of bfd-base is quite unambiguous: > > Abstract > > This document describes a protocol intended to detect faults in the > bidirectional path between two forwarding engines, including > interfaces, data link(s), and to the extent possible the forwarding > engines themselves, with potentially very low latency. It operates > independently of media, data protocols, and routing protocols. > > BFD, intended to detect forwarding plane faults, AKA fault detection. BFD= is part of the IETF's OAM toolset. This does not imply that it is not a control-plane function. > > >> This even >> includes notification to human operators. But mainly it is for the >> control-plane so that it can perform the necessary actions so that >> forwarding plane only drops as few packets as possible. > > Mainly? My only point is that from a functional perspective, BFD is not d= ata plane and not control plane. It detects data plane failures and (typica= lly, yet not necessarily) informs the control plane. The "D" in BFD for det= ection, it's not "R" for Restoration/Recovery. BFD does interact with contr= ol protocols for recovery. I agree that BFD protocol machinery is specified for detection, however the purpose (as explained by referencing RFC 5882 above) is for recovery. Similar to the liveness mechanisms of routing-protocols (that BFD improves upon) being considered control-plane, so too BFD is control-plane. So I agree that BFD is not forwarding/data plane. But I disagree that it is not control-plane. > >> A good >> system-design decouples BFD fate from the route-processor (not the >> control-plane). If BFD was always decoupled from the "control-plane" >> there wouldn't even be a need to have the C-bit :-) >> >> The C-bit was introduced because some older implementations at that >> time had BFD fate-shared with the routing-protocol fate (due to BFD >> running on the route-processor) and there was a need to distinguish it >> from newer BFD implementations that were not fate-shared with the >> routing-protocol fate (due to BFD running on the line-card). The real >> requirement was to disentangle BFD and GR state. Note that when C-bit >> is not set there is risk of undetected failures as explained in >> RFC5880 sec 4.3.2. Strictly speaking, the BFD C-bit being called >> control-plane-independent is a misnomer since it wasn't the >> control-plane independence but rather the independence from >> routing-protocol fate (especially when routing-protocol is in GR >> state) that was being expressed. To be blunt there was a need to >> prevent the far-end of an older implementation from performing >> recovery actions when reloading the route-processor, restarting >> processes etc, and an unset C-bit was deployed only after accepting >> the risks as described in RFC5880 sec 4.3.2. >> > > Yes, should be called 'GR routing-protocol independent" -- with the only = nit that this is actually in RFC 5882 (not 5880) Section 4.3.2. Thanks for fixing the typo. - Sri [snip] From roland.bless@kit.edu Tue Nov 12 00:55:14 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9FDA621E80DA for ; Tue, 12 Nov 2013 00:55:14 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -6.298 X-Spam-Level: X-Spam-Status: No, score=-6.298 tagged_above=-999 required=5 tests=[AWL=-0.049, BAYES_00=-2.599, HELO_EQ_DE=0.35, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Pi+uHMZjxF7F for ; Tue, 12 Nov 2013 00:55:08 -0800 (PST) Received: from iramx2.ira.uni-karlsruhe.de (iramx2.ira.uni-karlsruhe.de [141.3.10.81]) by ietfa.amsl.com (Postfix) with ESMTP id 9FF9A11E80ED for ; Tue, 12 Nov 2013 00:55:07 -0800 (PST) Received: from i72vorta.tm.uni-karlsruhe.de ([141.3.71.26] helo=vorta.tm.kit.edu) by iramx2.ira.uni-karlsruhe.de with esmtp port 25 id 1Vg9k3-0005bV-BK; Tue, 12 Nov 2013 09:54:37 +0100 Received: from [IPv6:::1] (ip6-localhost [IPv6:::1]) by vorta.tm.kit.edu (Postfix) with ESMTPS id 48B5CA80729; Tue, 12 Nov 2013 09:55:03 +0100 (CET) Message-ID: <5281ECE6.1040504@kit.edu> Date: Tue, 12 Nov 2013 09:55:02 +0100 From: "Bless, Roland (TM)" Organization: Institute of Telematics, Karlsruhe Institute of Technology User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.1.0 MIME-Version: 1.0 To: Pedro Martinez-Julia , sdn@irtf.org References: <001301ceded0$ab50b4c0$01f21e40$@riw.us> <4d2ee44e6fcb4dd18a26f8bc33c8abf1@exrad6.ad.rad.co.il> <00d201cedee5$039eaa10$0adbfe30$@riw.us> <20131111141907.GO17999@um.es> <012601cedeea$a00097b0$e001c710$@riw.us> <114475f8112547b2bab678eca08278cb@exrad6.ad.rad.co.il> <20131111190652.GE18189@um.es> In-Reply-To: <20131111190652.GE18189@um.es> X-Enigmail-Version: 1.5.2 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-ATIS-AV: ClamAV (iramx2.ira.uni-karlsruhe.de) X-ATIS-Timestamp: iramx2.ira.uni-karlsruhe.de 1384246477. Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 12 Nov 2013 08:55:14 -0000 Hi, On 11.11.2013 20:06, Pedro Martinez-Julia wrote: > I think you are attributing so much to data plane. Data plane should > just have functions that do not analyze the content of packets, i.e. > functions that just decide to forward (or not) a packet and to which > port it should be forwarded. No, I disagree. I would attribute DiffServ QoS mechanisms (e.g., multifield classifier, token buckets, marker, scheduling mechanisms) clearly to the data plane. Usually it's up to the control plane to set those mechanisms up for individual flows. The management plane part would be resource partioning, i.e., assigning link bandwidth shares to the individual per-hop behaviors and so on. Regards, Roland From pedromj@um.es Tue Nov 12 01:21:32 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8390B21E80F7 for ; Tue, 12 Nov 2013 01:21:31 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.554 X-Spam-Level: X-Spam-Status: No, score=-4.554 tagged_above=-999 required=5 tests=[AWL=-0.955, BAYES_00=-2.599, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id rBaIpVkwaxd3 for ; Tue, 12 Nov 2013 01:21:25 -0800 (PST) Received: from xenon13.um.es (xenon13.um.es [155.54.212.167]) by ietfa.amsl.com (Postfix) with ESMTP id 2DBAB21E80A8 for ; Tue, 12 Nov 2013 01:21:24 -0800 (PST) Received: from localhost (localhost [127.0.0.1]) by xenon13.um.es (Postfix) with ESMTP id A81825D8ED for ; Tue, 12 Nov 2013 10:21:22 +0100 (CET) X-Virus-Scanned: by antispam in UMU at xenon13.um.es Received: from xenon13.um.es ([127.0.0.1]) by localhost (xenon13.um.es [127.0.0.1]) (amavisd-new, port 10024) with LMTP id bguGjlXSDaJj for ; Tue, 12 Nov 2013 10:21:22 +0100 (CET) Received: from localhost (1.Red-88-25-205.staticIP.rima-tde.net [88.25.205.1]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) (Authenticated sender: pedromj@um.es) by xenon13.um.es (Postfix) with ESMTPSA id D80F85D8F6 for ; Tue, 12 Nov 2013 10:21:20 +0100 (CET) Date: Tue, 12 Nov 2013 10:21:20 +0100 From: Pedro Martinez-Julia To: sdn@irtf.org Message-ID: <20131112092120.GK18189@um.es> References: <001301ceded0$ab50b4c0$01f21e40$@riw.us> <4d2ee44e6fcb4dd18a26f8bc33c8abf1@exrad6.ad.rad.co.il> <00d201cedee5$039eaa10$0adbfe30$@riw.us> <20131111141907.GO17999@um.es> <012601cedeea$a00097b0$e001c710$@riw.us> <114475f8112547b2bab678eca08278cb@exrad6.ad.rad.co.il> <20131111190652.GE18189@um.es> <5281ECE6.1040504@kit.edu> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <5281ECE6.1040504@kit.edu> User-Agent: Mutt/1.5.22 (2013-10-16) Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 12 Nov 2013 09:21:32 -0000 On Tue, Nov 12, 2013 at 09:55:02AM +0100, Bless, Roland (TM) wrote: > Hi, > Hi, > > I think you are attributing so much to data plane. Data plane should > > just have functions that do not analyze the content of packets, i.e. > > functions that just decide to forward (or not) a packet and to which > > port it should be forwarded. > > No, I disagree. I would attribute DiffServ QoS mechanisms (e.g., > multifield classifier, token buckets, marker, scheduling mechanisms) > clearly to the data plane. Usually it's up to the control plane > to set those mechanisms up for individual flows. The management plane > part would be resource partioning, i.e., assigning link bandwidth > shares to the individual per-hop behaviors and so on. > Those mechanisms are part of the data plane and they do not break the definition I gave. They may analyze the content of packets but just for supporting the forwarding task. It does not mean anything to the device or functional block that analyzes the packet. On the other hand, control plane traffic does mean something to the functional block that processes the packets. > Regards, > Roland > Regards, Pedro -- Pedro Martinez-Julia Department of Communication and Information Engineering Faculty of Computer Science University of Murcia Email: pedromj@um.es --------------------------------------------------------- *** Entia non sunt multiplicanda praeter necessitatem *** From hadi@mojatatu.com Tue Nov 12 03:31:33 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 262DC11E80E0 for ; Tue, 12 Nov 2013 03:31:32 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.957 X-Spam-Level: X-Spam-Status: No, score=-102.957 tagged_above=-999 required=5 tests=[AWL=0.020, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, RCVD_IN_DNSWL_LOW=-1, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id cI1WrTiMFeaM for ; Tue, 12 Nov 2013 03:31:27 -0800 (PST) Received: from mail-vb0-f43.google.com (mail-vb0-f43.google.com [209.85.212.43]) by ietfa.amsl.com (Postfix) with ESMTP id B319A21E80AC for ; Tue, 12 Nov 2013 03:31:27 -0800 (PST) Received: by mail-vb0-f43.google.com with SMTP id w20so2364559vbb.30 for ; Tue, 12 Nov 2013 03:31:26 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc:content-type; bh=d+GcDBAGQ6S4WMXM5Bkw7MS5t4xnkbmKhJg2DMPY3h4=; b=OvBFZAzLoLkcMi32Lb4nl7hyS6C3wm4WOmKyQo7t7v/kFI4+loAfpwktcODPBUmttd 6p5DTOriyTGaxH0k3LCLvK/liRKjOiQ8CWc6W2jPvRvjkjlUL8gN4lJSmiuJn30o3acX qigdjC6Ybd8rr1jcDKTO4m+TByCNYgVQTg12Ay7BWzFjb4utemuS7+7CgMEeh5jQAAGj wPOfXPlbExi+rAvmqHP1GQqe7hNrVkjmbRMNM9yeGveZqOu4NI8PS3GufhKYkM3fsmRE xCDZoSeRisygvRgVyUm6iCkMk+zQdm48Cls9GN2qEhy+Mt7RL1zsxXfCbPYPrLO3vfSz wN7A== X-Gm-Message-State: ALoCoQnA/i8fcszlGVpBACx/1BVGeW2/1vOdUJFCkFYn7hm74i2D0eHI9hVAx8GGp4vvnwdyRrf6 X-Received: by 10.58.29.37 with SMTP id g5mr65424veh.38.1384255886885; Tue, 12 Nov 2013 03:31:26 -0800 (PST) MIME-Version: 1.0 Received: by 10.58.8.19 with HTTP; Tue, 12 Nov 2013 03:31:06 -0800 (PST) In-Reply-To: <2329b8e07d8444a2808de812c4ea0e2a@exrad6.ad.rad.co.il> References: <00dc01cedee6$327f9730$977ec590$@riw.us> <012501cedeea$7f46c120$7dd44360$@riw.us> <2329b8e07d8444a2808de812c4ea0e2a@exrad6.ad.rad.co.il> From: Jamal Hadi Salim Date: Tue, 12 Nov 2013 06:31:06 -0500 Message-ID: To: Yaakov Stein Content-Type: text/plain; charset=ISO-8859-1 Cc: Russ White , David Meyer , "sdn@irtf.org" Subject: Re: [Sdn] Timeliness WAS(Re: Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 12 Nov 2013 11:31:33 -0000 On Mon, Nov 11, 2013 at 12:48 PM, Yaakov Stein wrote: > No, we needn't put absolute times. > Ok, agreed. I was hoping there would be a good paper to what Dave Meyer pointed out here: http://cmg.soton.ac.uk/research/projects/separation-of-timescales-in-models-of-complex-networks/ > The times of importance are those that would signify unavailability for the particular application. > > Thus for interactive applications the times would be shorter than for progressive download ones. > > In the old days when voice was the only application, 100 ms was the gold standard, > and so protection switching was required to be mo more than 50 ms. I think what you say above may help me make the point. Can we equate "consistency" to what you refer to as "unavailability"? i.e. if i was able to update a FIB table at 10K/s then i would be able to reach consistency faster than if i did it at 1K/s Given that design intent of "management" interfaces was mostly targeted for human interaction both from usability as well as response tolerances - does automation change the fact that they are still constrained to that original design intent? I think not. Just because i can automate a CLI with expect does not magically change that it is slow (my tie to sense of urgency that offended Russ ;->). I can update tables a magnitude faster with OF than with netconf. Both are called SDN technologies. cheers, jamal From hadi@mojatatu.com Tue Nov 12 04:18:24 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E57CA21E80BC for ; Tue, 12 Nov 2013 04:18:24 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.958 X-Spam-Level: X-Spam-Status: No, score=-102.958 tagged_above=-999 required=5 tests=[AWL=0.019, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, RCVD_IN_DNSWL_LOW=-1, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Zif-UX3riVzv for ; Tue, 12 Nov 2013 04:18:20 -0800 (PST) Received: from mail-vc0-f175.google.com (mail-vc0-f175.google.com [209.85.220.175]) by ietfa.amsl.com (Postfix) with ESMTP id 415FF21F9D23 for ; Tue, 12 Nov 2013 04:18:20 -0800 (PST) Received: by mail-vc0-f175.google.com with SMTP id ht17so2104326vcb.20 for ; Tue, 12 Nov 2013 04:18:19 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc:content-type:content-transfer-encoding; bh=uvQWsFo1gqimV2kR0h91IaQ/NmKuks1kFBba70hvUNA=; b=FZG/ep8Aal+tX9r3SsRThtffqFn+UDg4fSEI5ryiZgFmvk1mNa8+8UK/Z1oHI1M7Kh dvto0wTd4A2+xGqpiVjVmvtFf0V7zi5B4CvA8IewR3NzoVTNKDxoTvMeRE2iyYy/ki93 ewhRcRV7zzlHKLArGpvJlRs6OhCxpocTGkH+DQE9Dy9ydpixBrGLS/7cyRoU/vJoeChQ qPPxTBAR5j7HMO5reGsCmifB/kZLSblAfdG4WkEhXH/SO9aRC5m4e74qH1jTZ3eqZIFV NACKammiafclQj/RPu49jpaNmgLXWNyHg3mfUFfleYeTSIJvtC7TUUsFn/AMKYPuzsEB QK6Q== X-Gm-Message-State: ALoCoQlaRTo3k2rYTgfJNFxcYtH8kQBNIdhWvVqkk6e2KBHMbpSTgx0eiDm7O3bggiQ2SIlu9W0j X-Received: by 10.58.29.37 with SMTP id g5mr4079veh.38.1384258699528; Tue, 12 Nov 2013 04:18:19 -0800 (PST) MIME-Version: 1.0 Received: by 10.58.8.19 with HTTP; Tue, 12 Nov 2013 04:17:58 -0800 (PST) In-Reply-To: References: <001301ceded0$ab50b4c0$01f21e40$@riw.us> <4d2ee44e6fcb4dd18a26f8bc33c8abf1@exrad6.ad.rad.co.il> <00d201cedee5$039eaa10$0adbfe30$@riw.us> <20131111141907.GO17999@um.es> <012601cedeea$a00097b0$e001c710$@riw.us> <640DC4F7-33C2-4E24-A0D0-BB1609AE108C@cisco.com> <4D6BF497-AA24-4E5B-AC0C-DF8FB56B4759@cisco.com> <5E5AEAFC-FFC2-4917-A243-CFC3F121ACA6@cisco.com> From: Jamal Hadi Salim Date: Tue, 12 Nov 2013 07:17:58 -0500 Message-ID: To: Sriganesh Kini Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Cc: Russ White , "Carlos Pignataro \(cpignata\)" , SDN IRTF list , Robert Raszuk , Pedro Martinez-Julia Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 12 Nov 2013 12:18:25 -0000 So one thing we struggled with, and seems related to this thread, was what to call an application that sits on an FE/Line card/switch. Consider for ex= ample an app that is offloading ARP or one that is offloading OSPF hellos. It sit= s in the line card. On occasion it updates something to the CE. I dont know what you want to call such a thing which is a helper to some control application= . We called it an application. cheers, jamal On Tue, Nov 12, 2013 at 2:52 AM, Sriganesh Kini wrote: > Hi Carlos, see inline. > > On Mon, Nov 11, 2013 at 6:23 PM, Carlos Pignataro (cpignata) > wrote: >> Hi, Sri, >> >> Interesting useful conversation :-) We may be on a tangent, except for s= upporting the fact that the definition of terms for these Planes is fuzzy a= nd not so clear... Please see inline. > > I don't believe the definitions are fuzzy. I hope they are becoming > clearer through this useful conversation. > >> >> On Nov 11, 2013, at 8:31 PM, Sriganesh Kini wrote: > > [snip] > >>>> >>>>> BFD is control-plane functionality. So is any function (that may exis= t >>>>> on the line-card) that builds structures that are required for >>>>> forwarding a packet. >>>> >>>> Here I disagree. BFD performs fault management for the forwarding plan= e. It is, by design, decoupled from the control plane (it even has the "C" = bit for "Control Plane Independent"). >>>> >>>> http://tools.ietf.org/html/rfc5880#section-2 >>> >>> BFD performs fault-notification (not management) so that other >>> entities can perform useful actions to recover from faults. >> >> ... or not. Specifically, where does it say "so that other entities can = perform useful actions to recover from faults"? Can you please provide a po= inter? > > Maybe not in those words but if you see RFC 5882 intro "...provides a > liveness detection mechanism that can be utilized by other network > components for which their integral liveness mechanisms are either too > slow, inappropriate, or nonexistent". Those other network components > perform actions to recover from faults. > > >> >> I do realize that recovery from faults is a common useful goal. However,= BFD performs fault *detection* (not notification), a subset of fault manag= ement, but not "in order to recover" necessarily. A perfectly valid use of = BFD is to trigger a log or notification (not an action to recover). Less us= eful, sure (depending the case). Valid, yes as well. > > Note that in your use-case too you used ".. to trigger a log or > notification". The purpose of these is also to do a recovery. This > recovery may not be your sub-50msec switchover type of recovery. It > could be a "send a line-man to check if/why the fiber is broken and > fix it" or "re-engineer traffic to take into account this broken link" > kind of network recovery. But it is a form of recovery action. > >> >> The Abstract of bfd-base is quite unambiguous: >> >> Abstract >> >> This document describes a protocol intended to detect faults in the >> bidirectional path between two forwarding engines, including >> interfaces, data link(s), and to the extent possible the forwarding >> engines themselves, with potentially very low latency. It operates >> independently of media, data protocols, and routing protocols. >> >> BFD, intended to detect forwarding plane faults, AKA fault detection. BF= D is part of the IETF's OAM toolset. > > This does not imply that it is not a control-plane function. > >> >> >>> This even >>> includes notification to human operators. But mainly it is for the >>> control-plane so that it can perform the necessary actions so that >>> forwarding plane only drops as few packets as possible. >> >> Mainly? My only point is that from a functional perspective, BFD is not = data plane and not control plane. It detects data plane failures and (typic= ally, yet not necessarily) informs the control plane. The "D" in BFD for de= tection, it's not "R" for Restoration/Recovery. BFD does interact with cont= rol protocols for recovery. > > I agree that BFD protocol machinery is specified for detection, > however the purpose (as explained by referencing RFC 5882 above) is > for recovery. Similar to the liveness mechanisms of routing-protocols > (that BFD improves upon) being considered control-plane, so too BFD is > control-plane. > > So I agree that BFD is not forwarding/data plane. But I disagree that > it is not control-plane. > >> >>> A good >>> system-design decouples BFD fate from the route-processor (not the >>> control-plane). If BFD was always decoupled from the "control-plane" >>> there wouldn't even be a need to have the C-bit :-) >>> >>> The C-bit was introduced because some older implementations at that >>> time had BFD fate-shared with the routing-protocol fate (due to BFD >>> running on the route-processor) and there was a need to distinguish it >>> from newer BFD implementations that were not fate-shared with the >>> routing-protocol fate (due to BFD running on the line-card). The real >>> requirement was to disentangle BFD and GR state. Note that when C-bit >>> is not set there is risk of undetected failures as explained in >>> RFC5880 sec 4.3.2. Strictly speaking, the BFD C-bit being called >>> control-plane-independent is a misnomer since it wasn't the >>> control-plane independence but rather the independence from >>> routing-protocol fate (especially when routing-protocol is in GR >>> state) that was being expressed. To be blunt there was a need to >>> prevent the far-end of an older implementation from performing >>> recovery actions when reloading the route-processor, restarting >>> processes etc, and an unset C-bit was deployed only after accepting >>> the risks as described in RFC5880 sec 4.3.2. >>> >> >> Yes, should be called 'GR routing-protocol independent" -- with the only= nit that this is actually in RFC 5882 (not 5880) Section 4.3.2. > > Thanks for fixing the typo. > > - Sri > > [snip] > _______________________________________________ > sdn mailing list > sdn@irtf.org > https://www.irtf.org/mailman/listinfo/sdn From russw@riw.us Tue Nov 12 05:22:56 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id F269A11E8164 for ; Tue, 12 Nov 2013 05:22:55 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id obT7uea0QBo1 for ; Tue, 12 Nov 2013 05:22:50 -0800 (PST) Received: from server.riw.us (server.riw.us [162.144.32.236]) by ietfa.amsl.com (Postfix) with ESMTP id 1382C11E8159 for ; Tue, 12 Nov 2013 05:22:50 -0800 (PST) Received: from [12.193.240.66] (port=64030 helo=RussPC) by server.riw.us with esmtpsa (TLSv1:AES128-SHA:128) (Exim 4.80.1) (envelope-from ) id 1VgDvV-0005gJ-3w; Tue, 12 Nov 2013 13:22:41 +0000 From: "Russ White" To: "'Carlos Pignataro \(cpignata\)'" , "'Sriganesh Kini'" References: <001301ceded0$ab50b4c0$01f21e40$@riw.us> <4d2ee44e6fcb4dd18a26f8bc33c8abf1@exrad6.ad.rad.co.il> <00d201cedee5$039eaa10$0adbfe30$@riw.us> <20131111141907.GO17999@um.es> <012601cedeea$a00097b0$e001c710$@riw.us> <640DC4F7-33C2-4E24-A0D0-BB1609AE108C@cisco.com> <4D6BF497-AA24-4E5B-AC0C-DF8FB56B4759@cisco.com> In-Reply-To: <4D6BF497-AA24-4E5B-AC0C-DF8FB56B4759@cisco.com> Date: Tue, 12 Nov 2013 08:22:41 -0500 Message-ID: <015901cedfaa$45291e00$cf7b5a00$@riw.us> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Outlook 15.0 Thread-Index: AQENI0eiA8rOH7Iq3TRo8LAe8dZyDQFI1QtMAbjUhh0BxvBVogKnk/x4AZ6SrJICDtdm1QI/0JY2Aq9RpP0BpcdgKQDx6tlnAmyc08ECVurS6AITkWYCmtksSwA= Content-Language: en-us X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server.riw.us X-AntiAbuse: Original Domain - irtf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - riw.us X-Get-Message-Sender-Via: server.riw.us: authenticated_id: russw@riw.us X-Source: X-Source-Args: X-Source-Dir: Cc: 'SDN IRTF list' , 'Pedro Martinez-Julia' , 'Robert Raszuk' Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 12 Nov 2013 13:22:56 -0000 > > We seem to be using control-plane and routing-protocols as synonyms. > > They are not. Routing protocols are considered part of the control > > plane. But that does not mean that the control-plane consists only of > > the routing-protocols. I hope not... What I think we need is a device centric, functionally based model of these different planes. We don't want: - Time based models, because timing changes over time with capabilities and requirements, and because we want to be able to understand what the timing requirements are, rather than assuming them in the definition. With a time based model, if you ask, "how long should it take for a control plane to converge and update the data plane," the answer is, "if it converges in less than x ms, then it's all data plane." That answer simply doesn't convey any useful information. - Service based models, because services must know what to control to build the service they want to create. But unless we know what an actual forwarding device looks like in terms of function, we can't figure out the interfaces and dynamics of actually modifying that forwarding device. So we need service based models, but we definitely need a device centric functional model for the service models to interact with. - Network based models --same as the service based models above. I specifically don't want us to consider where the process runs, how long it takes, whether a human is (or has traditionally been) involved or not, what services are being offered, what role this device plays in the overall plan of the network, etc. The only question that should matter in a model that will actually help us understand what an individual forwarding device looks like is: What does this process or protocol do in relationship to the action of forwarding packets? Certainly we can disagree about where any particular protocol fits into such a model, but none of that should invalidate the model -- it should simply help us understand the interactions between the pieces better. In fact, the entire discussion over BFD is centered around what BFD does, and how it interacts with other stuff -- not on its place in a larger scheme of services, or "because it's so fast, it must be data plane," etc. In other words, we're implicitly assuming a device centric functionality based model in our heads in the process of arguing for the non-usefulness of just such a model. Once we have a device centric functional model in place, then we can build a plethora of service and network models, and see how they interact --what interfaces there need to be, what those interfaces need to look like, the timing between the interfaces, what happens if we try and build two different service models on top of a single physical network, etc. If we start with a services or network model, we're all going to be propounding different devices with different capabilities and different interfaces to get to our favorite set of services --and we'll end up with no actual set of common api's or idea what one device sitting in an actual rack forwarding real packets would need to do in relation to the plethora of service and network models we've created. If we start with a time based model, we're going to end up with a mash of stuff all in the data plane, because someone can always think of at least one solid use case to make any given monitoring, configuration, or any other task as fast as actually switching a packet. The reason our presentations are all over the place is that we're all working from different models in different worlds --we need a point of contact (or context) where all the models meet and interact, so we can see how to actually build real networks with this stuff. Until we get there, we're going to be out wandering the weeds. :-) Russ From russw@riw.us Tue Nov 12 05:31:26 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id BCCD411E8140 for ; Tue, 12 Nov 2013 05:31:26 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 1w-P78F8J37R for ; Tue, 12 Nov 2013 05:31:21 -0800 (PST) Received: from server.riw.us (server.riw.us [162.144.32.236]) by ietfa.amsl.com (Postfix) with ESMTP id E43EA11E813D for ; Tue, 12 Nov 2013 05:31:20 -0800 (PST) Received: from [12.193.240.66] (port=64055 helo=RussPC) by server.riw.us with esmtpsa (TLSv1:AES128-SHA:128) (Exim 4.80.1) (envelope-from ) id 1VgE3k-0005mr-P1; Tue, 12 Nov 2013 13:31:13 +0000 From: "Russ White" To: "'Scott Brim'" References: <66422454-39A4-40F0-BFF6-986BFC4CAF9A@riw.us> In-Reply-To: Date: Tue, 12 Nov 2013 08:31:14 -0500 Message-ID: <016301cedfab$7620b620$62622260$@riw.us> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Outlook 15.0 Thread-Index: AQENI0eiA8rOH7Iq3TRo8LAe8dZyDQFgwClGAkH8YDEBrqzr1pt6gzhg Content-Language: en-us X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server.riw.us X-AntiAbuse: Original Domain - irtf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - riw.us X-Get-Message-Sender-Via: server.riw.us: authenticated_id: russw@riw.us X-Source: X-Source-Args: X-Source-Dir: Cc: sdn@irtf.org Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 12 Nov 2013 13:31:26 -0000 > > For me the difference is between something that is supposed to be > in continuous operation, and something that is supposed to set up that > continuous operation. I see the former as control plane and forwarding > plane, and the latter as management. When you perform a management > function, then you can sit back and watch to make sure you did it right. A > control function, on the other hand, continues _as part of_ things going right. > > I think this merges the control and data planes, though -- and I think > we want to be able to differentiate between them. > > Russ, maybe it merges your concepts of planes, but I'm trying to get you to > use different concepts. In what I said, control and management are clearly > separated. We can get to specifics if you like, as tests of conceptual models. > Just keep in mind that components function in multiple planes > simultaneously. Given your definition --these things are all in continuous operation, so they must all be control plane: - Forwarding of packets - Detection of down links - Flooding and maintenance of topology information - Monitoring of cpu thermals - Monitoring of memory utilization - Logging - Reactive configuration to black hole attacks So these are all control plane --what, precisely, is the data plane or even the management plane? If I ask, "Is link utilization monitoring control or management plane (since this model doesn't have a data plane)," the answer is, "It depends on whether or not the process monitoring the link utilization is push or pull." That doesn't make any sense to me --it doesn't convey useful information on which I can try to understand the relationship between the moving parts involved. :-) Russ From timcopley@gmail.com Tue Nov 12 06:56:27 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2E67511E816D for ; Tue, 12 Nov 2013 06:56:25 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id NEXjRMS7AXuk for ; Tue, 12 Nov 2013 06:56:22 -0800 (PST) Received: from mail-wi0-x229.google.com (mail-wi0-x229.google.com [IPv6:2a00:1450:400c:c05::229]) by ietfa.amsl.com (Postfix) with ESMTP id AFC4E11E8169 for ; Tue, 12 Nov 2013 06:56:20 -0800 (PST) Received: by mail-wi0-f169.google.com with SMTP id cb5so3844835wib.2 for ; Tue, 12 Nov 2013 06:56:19 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; bh=ZAgkCvdHGDvX9syiBBqFy0+7NTBes6AqFngHscCeDoQ=; b=EEU7BkPdjRAtuE5Enu26hJO7NEsjmDNJqeyeFtdQz6RWLu3Uv4T2F/V2A1P7DMw8Bp L4PcG4fT2oT0PKvAKqus5/vnVZ90QJ6ogPrWO4fO3jrC6IHg5EClnbNFI7y6QnQ/lHqK wMkUW/ybob2a5G2uiO4sHgq9JPBBmIjA24PcumdwoR0GxgQrK9meMhNc3YFmizMhev3B fZakhz9StdFZbzau9vhGhKw+zS3CTGUiAFxF61IjiQ9q0Y14YbsCiCiCbdplG0GEhJ2d 7CVKJeDapKGlJJtpb7tJBLSLLkk5KrDTZKldEaYfazJ74AT41xTDUa22qZo+bMB4d/YR ygKQ== MIME-Version: 1.0 X-Received: by 10.194.243.170 with SMTP id wz10mr198964wjc.74.1384268179445; Tue, 12 Nov 2013 06:56:19 -0800 (PST) Received: by 10.194.239.226 with HTTP; Tue, 12 Nov 2013 06:56:19 -0800 (PST) In-Reply-To: <001301ceded0$ab50b4c0$01f21e40$@riw.us> References: <001301ceded0$ab50b4c0$01f21e40$@riw.us> Date: Tue, 12 Nov 2013 07:56:19 -0700 Message-ID: From: tim copley To: sdn@irtf.org Content-Type: multipart/alternative; boundary=089e0149411a1c2c6204eafc0d67 Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 12 Nov 2013 14:56:27 -0000 --089e0149411a1c2c6204eafc0d67 Content-Type: text/plain; charset=ISO-8859-1 So I've been giving this a lot of thought during this discussion and I think what the problem is that BFD can be used in multiple "planes" My thinking was swayed both ways, and what I eventually came to was the realization. It can be used in the data plane to stop traffic or pull an interface down It can be used in the control plane, buy feeding information to a Routing protocol or actually be a part of the routing protocol that will make a control plan decision It can be used as information feed to a management plane. Perhaps it is as somebody said that it's the function performed. BFD is just one of the tools in our toolbox for providing information into our SDN system. But I thought we were building models? TimC -- "Speed is fine, but accuracy is final." Wyatt Earp, 1888 --089e0149411a1c2c6204eafc0d67 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
So I've been giving this a lo= t of thought during this discussion and I
think what the problem is tha= t BFD can be used in multiple "planes"
My thinking = was swayed both ways, and what I eventually came to
was the realization.

It can be used in the data pla= ne to stop traffic or pull an interface down
It can be used in the control plane, buy feeding information to a Rou= ting
protocol or actually be a part of the routing protocol that will m= ake a
control plan decision
It can be used as information feed= to a management plane.

Perhaps it is as somebody said that it's the function perform= ed. BFD
is just one of the tools in our toolbox for providing informatio= n into our
SDN system.=A0 But I thought we were building models?

TimC
--
"Speed is fine, but accuracy is fina= l." Wyatt Earp, 1888
--089e0149411a1c2c6204eafc0d67-- From dmm@1-4-5.net Tue Nov 12 07:25:20 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id DC51D21E812F for ; Tue, 12 Nov 2013 07:25:20 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.977 X-Spam-Level: X-Spam-Status: No, score=-2.977 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id pAiyBf8NBQTt for ; Tue, 12 Nov 2013 07:25:16 -0800 (PST) Received: from mail-oa0-f46.google.com (mail-oa0-f46.google.com [209.85.219.46]) by ietfa.amsl.com (Postfix) with ESMTP id 8AD9221E8121 for ; Tue, 12 Nov 2013 07:25:16 -0800 (PST) Received: by mail-oa0-f46.google.com with SMTP id m1so4036360oag.33 for ; Tue, 12 Nov 2013 07:25:16 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type; bh=UKVrbYq/nxnUwiBa1hMgXnzG6bznwusHaiUZfnfSwtM=; b=aOOGiSEWL3GoyM5q6S4FiJ76lhMzjE1N/GXsu84ay0xB6mwmxhOD8fUPIPDRHZHS1T K+Th7b3A4RL8UysQiRXpoPzq4zqUCURrRMvRaY28aDLHUxcTQThl646AR2Cf0ymSZmpH WuGRcF4fmcqzOVvcaXcqPzMC9b24gTrl2RDOk5/dy8rfmdu/VxDR+k9kn/xHFbo+PmEQ 1djnG0rG2jlMsUXocpqNGI61oj4CuT2sp0QNbIxWzF1GC9Mr0FCP1gJx8fLAlN8eRe8g yqNhaYKJ5WLsH0gHGAdkbFdkFYcFa/O99MVndQi/cotwwa1HRY5l+b/LauGaMsI1i7Dk Fkhw== X-Gm-Message-State: ALoCoQmra6J8kwhJRgXTKBtPzyZ+g4aoxnrpVby4rD8Brb/qIsVhc3uJpV/feT7Qg7H4ZrGruY/W MIME-Version: 1.0 X-Received: by 10.60.69.130 with SMTP id e2mr1369870oeu.98.1384269915891; Tue, 12 Nov 2013 07:25:15 -0800 (PST) Received: by 10.182.66.168 with HTTP; Tue, 12 Nov 2013 07:25:15 -0800 (PST) X-Originating-IP: [2001:468:d01:9c:2019:b35f:6ccf:d188] In-Reply-To: References: <00dc01cedee6$327f9730$977ec590$@riw.us> <012501cedeea$7f46c120$7dd44360$@riw.us> <2329b8e07d8444a2808de812c4ea0e2a@exrad6.ad.rad.co.il> Date: Tue, 12 Nov 2013 07:25:15 -0800 Message-ID: From: David Meyer To: Jamal Hadi Salim Content-Type: text/plain; charset=ISO-8859-1 Cc: Russ White , Yaakov Stein , "sdn@irtf.org" Subject: Re: [Sdn] Timeliness WAS(Re: Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 12 Nov 2013 15:25:21 -0000 On Tue, Nov 12, 2013 at 3:31 AM, Jamal Hadi Salim wrote: > On Mon, Nov 11, 2013 at 12:48 PM, Yaakov Stein wrote: >> No, we needn't put absolute times. >> > > Ok, agreed. > I was hoping there would be a good paper to what Dave Meyer pointed out > here: > http://cmg.soton.ac.uk/research/projects/separation-of-timescales-in-models-of-complex-networks/ I'm still not sure how to apply the idea of separation of timescales here. In general the idea, at least in the systems literature, is that if two processes operate on widely varying timescales (like an order of magnitude or more) then one or the other can be approximated by a constant (in "slower" case) or considered instantaneous (in the "faster" case). This leads to vast simplification of mathematical models. However, here we don't really have mathematical models of the "planes" (save TCP). > >> The times of importance are those that would signify unavailability for the particular application. >> >> Thus for interactive applications the times would be shorter than for progressive download ones. >> >> In the old days when voice was the only application, 100 ms was the gold standard, >> and so protection switching was required to be mo more than 50 ms. > > I think what you say above may help me make the point. > Can we equate "consistency" to what you refer to as "unavailability"? If I understand what you are saying, I'm not sure you want to do that. Consistency and Availability are different things, at least from the CAP theorem perspective. > i.e. if i was able to update a FIB table at 10K/s then i would be able to reach > consistency faster than if i did it at 1K/s > Given that design intent of "management" interfaces was mostly > targeted for human > interaction both from usability as well as response tolerances - does > automation > change the fact that they are still constrained to that original > design intent? > I think not. > Just because i can automate a CLI with expect does not magically > change that it is slow > (my tie to sense of urgency that offended Russ ;->). > I can update tables a magnitude faster with OF than with netconf. Both > are called SDN technologies. I doubt that if OF had the same ACID properties that an interface like netconf has that it would be faster. Whether you would want that is another question. --dmm > > cheers, > jamal From pedromj@um.es Tue Nov 12 07:29:33 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6CC3721E8170 for ; Tue, 12 Nov 2013 07:29:33 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -6.599 X-Spam-Level: X-Spam-Status: No, score=-6.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id wiY3xtW9sG8s for ; Tue, 12 Nov 2013 07:29:27 -0800 (PST) Received: from xenon12.um.es (xenon12.um.es [155.54.212.166]) by ietfa.amsl.com (Postfix) with ESMTP id 5B9EF21E8195 for ; Tue, 12 Nov 2013 07:29:11 -0800 (PST) Received: from localhost (localhost [127.0.0.1]) by xenon12.um.es (Postfix) with ESMTP id 076384C64D for ; Tue, 12 Nov 2013 16:29:08 +0100 (CET) X-Virus-Scanned: by antispam in UMU at xenon12.um.es Received: from xenon12.um.es ([127.0.0.1]) by localhost (xenon12.um.es [127.0.0.1]) (amavisd-new, port 10024) with LMTP id AlhoYBucp-jq for ; Tue, 12 Nov 2013 16:29:07 +0100 (CET) Received: from localhost (unknown [46.25.162.195]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) (Authenticated sender: pedromj@um.es) by xenon12.um.es (Postfix) with ESMTPSA id 6EBB34C63D for ; Tue, 12 Nov 2013 16:29:07 +0100 (CET) Date: Tue, 12 Nov 2013 16:29:06 +0100 From: Pedro Martinez-Julia To: sdn@irtf.org Message-ID: <20131112152906.GP18189@um.es> References: <66422454-39A4-40F0-BFF6-986BFC4CAF9A@riw.us> <016301cedfab$7620b620$62622260$@riw.us> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <016301cedfab$7620b620$62622260$@riw.us> User-Agent: Mutt/1.5.22 (2013-10-16) Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 12 Nov 2013 15:29:33 -0000 On Tue, Nov 12, 2013 at 08:31:14AM -0500, Russ White wrote: > > Given your definition --these things are all in continuous operation, so > they must all be control plane: > > - Forwarding of packets > - Detection of down links > - Flooding and maintenance of topology information > - Monitoring of cpu thermals > - Monitoring of memory utilization > - Logging > - Reactive configuration to black hole attacks > > So these are all control plane --what, precisely, is the data plane or even > the management plane? If I ask, "Is link utilization monitoring control or > management plane (since this model doesn't have a data plane)," the answer > is, "It depends on whether or not the process monitoring the link > utilization is push or pull." That doesn't make any sense to me --it doesn't > convey useful information on which I can try to understand the relationship > between the moving parts involved. > Those functions/operations are not all part of the control plane. The difference between the control plane and the management plane is that the former is *required* by the network (or its individual devices) to work as expected while the management plane is not strictly required but permits to know the status and to define the *expected* behavior of the network (or, also, individual devices). > :-) > > Russ > Regards, Pedro -- Pedro Martinez-Julia Department of Communication and Information Engineering Faculty of Computer Science University of Murcia Email: pedromj@um.es --------------------------------------------------------- *** Entia non sunt multiplicanda praeter necessitatem *** From russw@riw.us Tue Nov 12 07:29:44 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3613121E819A for ; Tue, 12 Nov 2013 07:29:44 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.598 X-Spam-Level: X-Spam-Status: No, score=-2.598 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id E2tLvet-TFAa for ; Tue, 12 Nov 2013 07:29:38 -0800 (PST) Received: from server.riw.us (server.riw.us [162.144.32.236]) by ietfa.amsl.com (Postfix) with ESMTP id C267C11E8181 for ; Tue, 12 Nov 2013 07:29:23 -0800 (PST) Received: from mobile-166-147-070-132.mycingular.net ([166.147.70.132]:57471 helo=[10.143.231.33]) by server.riw.us with esmtpa (Exim 4.80.1) (envelope-from ) id 1VgFu6-0006gN-Ae; Tue, 12 Nov 2013 15:29:22 +0000 MIME-Version: 1.0 To: tim copley , "sdn@irtf.org" From: Russ White Date: Tue, 12 Nov 2013 09:28:46 -0600 Content-Type: multipart/alternative; boundary="_49004166-EEF6-499B-8B36-3F76121F4F20_" X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server.riw.us X-AntiAbuse: Original Domain - irtf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - riw.us X-Get-Message-Sender-Via: server.riw.us: authenticated_id: russw@riw.us X-Source: X-Source-Args: X-Source-Dir: Message-Id: <20131112152923.C267C11E8181@ietfa.amsl.com> Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 12 Nov 2013 15:29:44 -0000 --_49004166-EEF6-499B-8B36-3F76121F4F20_ Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" My general point is we should be building a model based on function, rather= than time scales or network services as a baseline. :-) Russ -----Original Message----- From: "tim copley" Sent: =E2=80=8E11/=E2=80=8E12/=E2=80=8E2013 8:56 AM To: "sdn@irtf.org" Subject: Re: [Sdn] Thoughts on Defining control and Management Planes So I've been giving this a lot of thought during this discussion and I=20 think what the problem is that BFD can be used in multiple "planes" My thinking was swayed both ways, and what I eventually came to was the realization. It can be used in the data plane to stop traffic or pull an interface down= =20 It can be used in the control plane, buy feeding information to a Routing=20 protocol or actually be a part of the routing protocol that will make a=20 control plan decision It can be used as information feed to a management plane. Perhaps it is as somebody said that it's the function performed. BFD is just one of the tools in our toolbox for providing information into our SDN system. But I thought we were building models? TimC --=20 "Speed is fine, but accuracy is final." Wyatt Earp, 1888 = --_49004166-EEF6-499B-8B36-3F76121F4F20_ Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset="utf-8"

My gene= ral point is we should be building a model based on function, rather than t= ime scales or network services as a baseline.

:-)

Russ
<= /DIV>
From: tim copleySent: =E2=80=8E11/=E2=80=8E12/=E2=80=8E2013 8:56 AM
To: sdn@irtf.org
Su= bject: Re: [Sdn] Thoughts on Defining control and Management Planes
=
So I've been giving this a lot of thought during this discussion and I=
think what the problem is that BFD can be used in multiple "planes"
My thinking was swayed both ways, and what I eventually came to
was= the realization.

It can be used in the data plane to stop traffic or pull an = interface down
It can be used in the control plane, buy feeding i= nformation to a Routing
protocol or actually be a part of the routing p= rotocol that will make a
control plan decision
It can be used = as information feed to a management plane.

Perhaps it is as so= mebody said that it's the function performed. BFD
is just one of the too= ls in our toolbox for providing information into our
SDN system.&n= bsp; But I thought we were building models?

TimC
--
"Speed is fine, but accuracy is fin= al." Wyatt Earp, 1888
= --_49004166-EEF6-499B-8B36-3F76121F4F20_-- From dmm@1-4-5.net Tue Nov 12 07:33:39 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8D1DF11E81EC for ; Tue, 12 Nov 2013 07:33:39 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.977 X-Spam-Level: X-Spam-Status: No, score=-2.977 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id D7xr5cdsu3rt for ; Tue, 12 Nov 2013 07:33:35 -0800 (PST) Received: from mail-ob0-f180.google.com (mail-ob0-f180.google.com [209.85.214.180]) by ietfa.amsl.com (Postfix) with ESMTP id CE88711E8187 for ; Tue, 12 Nov 2013 07:33:29 -0800 (PST) Received: by mail-ob0-f180.google.com with SMTP id vb8so3148044obc.39 for ; Tue, 12 Nov 2013 07:33:29 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type; bh=q1VfqbuXyAi8RworyLU9Q4fzsZDeztHLhZLXXsc3jAg=; b=lLASFGmWtFv79z+w8uEU5LxvhwZVqbSFcB0pPMReWew9G0tGFt9smrlqktNZgGXQpZ vilSrvLsyh6em8c/8lYEIBZSuGgh3y4okmtJZlyogSw4q+tNWdltwLoHBT5OZhmsoS78 YOSOhf3j2CP7YpodFuR+sB7JPiCMAMueTCOhMFi9j2R5vCXItQbj8qWgK4GSkeJj6FLS Swl8OgoVNnUffGki62y69iGKf2wNtpl/7M5ZCMVJlTkZlhR4Wxgb8WPldshERrxnZ1BJ xBSsW6LpBhtbIqRdVc8kmRYtCzEyIJAPM+u3LxiQXZS4R7XP3OedBucHSGeLH4W8afX8 cEmw== X-Gm-Message-State: ALoCoQlHGiR7uOSCvGSshrMtuEPURiDg3s8cB8mofCufpNU+zxxNLhuyP9IW9bSB1mrppbjkEzRk MIME-Version: 1.0 X-Received: by 10.60.131.232 with SMTP id op8mr7090363oeb.75.1384270409385; Tue, 12 Nov 2013 07:33:29 -0800 (PST) Received: by 10.182.66.168 with HTTP; Tue, 12 Nov 2013 07:33:29 -0800 (PST) X-Originating-IP: [2001:468:d01:9c:2019:b35f:6ccf:d188] In-Reply-To: <20131112152923.C267C11E8181@ietfa.amsl.com> References: <20131112152923.C267C11E8181@ietfa.amsl.com> Date: Tue, 12 Nov 2013 07:33:29 -0800 Message-ID: From: David Meyer To: Russ White Content-Type: text/plain; charset=ISO-8859-1 Cc: tim copley , "sdn@irtf.org" Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 12 Nov 2013 15:33:39 -0000 -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On Tue, Nov 12, 2013 at 7:28 AM, Russ White <russw@riw.us> wrote:>> My general point is we should be building a model based on function, rather> than time scales or network services as a baseline. I agree with this for several reasons, not the least of which that the timescales we're talking about here are poorly defined with respect to interaction of planes (making comparison difficult if not impossible), and are rapidly changing in any event. - --dmm >> :-)>> Russ> ________________________________> From: tim copley> Sent: 11/12/2013 8:56 AM> To: sdn@irtf.org>> Subject: Re: [Sdn] Thoughts on Defining control and Management Planes>> So I've been giving this a lot of thought during this discussion and I> think what the problem is that BFD can be used in multiple "planes"> My thinking was swayed both ways, and what I eventually came to> was the realization.>> It can be used in the data plane to stop traffic or pull an interface down> It can be used in the control plane, buy feeding information to a Routing> protocol or actually be a part of the routing protocol that will make a> control plan decision> It can be used as information feed to a management plane.>> Perhaps it is as somebody said that it's the function performed. BFD> is just one of the tools in our toolbox for providing information into our> SDN system. But I thought we were building models?>> TimC> --> "Speed is fine, but accuracy is final." Wyatt Earp, 1888>> _______________________________________________> sdn mailing list> sdn@irtf.org> https://www.irtf.org/mailman/listinfo/sdn> -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.15 (GNU/Linux) iEYEARECAAYFAlKCSkgACgkQORgD1qCZ2KcDAQCfWKhBmkAWqtedypSAe/rqleFb AsYAnjT2Yu51n7vuwhyWLkFD4Y37kvvT =iVfF -----END PGP SIGNATURE----- From pedromj@um.es Tue Nov 12 07:41:33 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 39AFE21F99E8 for ; Tue, 12 Nov 2013 07:41:33 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -6.599 X-Spam-Level: X-Spam-Status: No, score=-6.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id g8USJnZDDzbc for ; Tue, 12 Nov 2013 07:41:27 -0800 (PST) Received: from xenon11.um.es (xenon11.um.es [155.54.212.165]) by ietfa.amsl.com (Postfix) with ESMTP id 4362811E8188 for ; Tue, 12 Nov 2013 07:39:54 -0800 (PST) Received: from localhost (localhost [127.0.0.1]) by xenon11.um.es (Postfix) with ESMTP id F2D2A53C0E for ; Tue, 12 Nov 2013 16:39:51 +0100 (CET) X-Virus-Scanned: by antispam in UMU at xenon11.um.es Received: from xenon11.um.es ([127.0.0.1]) by localhost (xenon11.um.es [127.0.0.1]) (amavisd-new, port 10024) with LMTP id 97Y0XPCCWy9n for ; Tue, 12 Nov 2013 16:39:51 +0100 (CET) Received: from localhost (unknown [46.25.162.195]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) (Authenticated sender: pedromj@um.es) by xenon11.um.es (Postfix) with ESMTPSA id 629A953BAA for ; Tue, 12 Nov 2013 16:39:51 +0100 (CET) Date: Tue, 12 Nov 2013 16:39:51 +0100 From: Pedro Martinez-Julia To: sdn@irtf.org Message-ID: <20131112153951.GR18189@um.es> References: <20131112152923.C267C11E8181@ietfa.amsl.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20131112152923.C267C11E8181@ietfa.amsl.com> User-Agent: Mutt/1.5.22 (2013-10-16) Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 12 Nov 2013 15:41:33 -0000 On Tue, Nov 12, 2013 at 09:28:46AM -0600, Russ White wrote: > > My general point is we should be building a model based on function, rather than time scales or network services as a baseline. > I totally agree, as you can figure out from my messages. In fact I do not see any reason or benefit in basing the model on time scales or higher network/service abstractions. The latter should be located in other models: the network and service models, which are different and higher layer than the SDN model. > :-) > > Russ > Regards, Pedro -- Pedro Martinez-Julia Department of Communication and Information Engineering Faculty of Computer Science University of Murcia Email: pedromj@um.es --------------------------------------------------------- *** Entia non sunt multiplicanda praeter necessitatem *** From dmm@1-4-5.net Tue Nov 12 07:45:58 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 054D921E8201 for ; Tue, 12 Nov 2013 07:45:51 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.977 X-Spam-Level: X-Spam-Status: No, score=-2.977 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id k8TIPY3Jb1qs for ; Tue, 12 Nov 2013 07:45:42 -0800 (PST) Received: from mail-ob0-f173.google.com (mail-ob0-f173.google.com [209.85.214.173]) by ietfa.amsl.com (Postfix) with ESMTP id 44AFE21E81EA for ; Tue, 12 Nov 2013 07:44:58 -0800 (PST) Received: by mail-ob0-f173.google.com with SMTP id wm4so6068745obc.18 for ; Tue, 12 Nov 2013 07:44:57 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type; bh=KSXjn9MYGxafGn2QcMbvqaBaG46lSHvM95w1Zq0hZAA=; b=DOfaP/Q3NWwZY2lk1FPCRzbdSlKstE8MHFEmRbIEGInRlIXjz2OnlNveMyPn2RFPMy PuZBH6jc0783DIVymVyxXb4slCJh9gbuBEhmq5UpKvpXkdYdkUZHmXROW+LdyvinTZic 4PL+el62uEE832I6c5PYRhteuwkZiqUiAPgO5PUo2ZxFsFU1+mrhx9+i2Trs1tdCC/OC Vzr4FitlNUKmZ7NK4mTCOBWicgH0jMBWmOts3dcRMAfGtPklP/vIV6csTNjf+A58aK81 fOrk+M16wH6264AIyCoFM0bLuPj5CZEJFaEfqyiTwB57UTN8yY+vnFxeYB4ZweezD7s6 3RZA== X-Gm-Message-State: ALoCoQnJRVEHa8+1Z2Dv/Nll881xRbZOPPzg8kIDEoBHWCWCph0amo2qKJeStx8kM6ciqgcX98W7 MIME-Version: 1.0 X-Received: by 10.182.80.196 with SMTP id t4mr31339622obx.1.1384271097592; Tue, 12 Nov 2013 07:44:57 -0800 (PST) Received: by 10.182.66.168 with HTTP; Tue, 12 Nov 2013 07:44:57 -0800 (PST) X-Originating-IP: [2001:468:d01:9c:2019:b35f:6ccf:d188] In-Reply-To: <20131112152906.GP18189@um.es> References: <66422454-39A4-40F0-BFF6-986BFC4CAF9A@riw.us> <016301cedfab$7620b620$62622260$@riw.us> <20131112152906.GP18189@um.es> Date: Tue, 12 Nov 2013 07:44:57 -0800 Message-ID: From: David Meyer To: Pedro Martinez-Julia Content-Type: text/plain; charset=ISO-8859-1 Cc: SDN IRTF list Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 12 Nov 2013 15:45:58 -0000 On Tue, Nov 12, 2013 at 7:29 AM, Pedro Martinez-Julia wrote: > On Tue, Nov 12, 2013 at 08:31:14AM -0500, Russ White wrote: >> >> Given your definition --these things are all in continuous operation, so >> they must all be control plane: >> >> - Forwarding of packets >> - Detection of down links >> - Flooding and maintenance of topology information >> - Monitoring of cpu thermals >> - Monitoring of memory utilization >> - Logging >> - Reactive configuration to black hole attacks >> >> So these are all control plane --what, precisely, is the data plane or even >> the management plane? If I ask, "Is link utilization monitoring control or >> management plane (since this model doesn't have a data plane)," the answer >> is, "It depends on whether or not the process monitoring the link >> utilization is push or pull." That doesn't make any sense to me --it doesn't >> convey useful information on which I can try to understand the relationship >> between the moving parts involved. >> > > Those functions/operations are not all part of the control plane. The > difference between the control plane and the management plane is that > the former is *required* by the network (or its individual devices) to > work as expected while the management plane is not strictly required but > permits to know the status and to define the *expected* behavior of the > network (or, also, individual devices). This is at the very least arguable. For example, if I configure devices with some "management" interface will the network work as expected say, without IP addresses on the interfaces? --dmm > >> :-) >> >> Russ >> > > Regards, > Pedro > > -- > Pedro Martinez-Julia > Department of Communication and Information Engineering > Faculty of Computer Science > University of Murcia > Email: pedromj@um.es > --------------------------------------------------------- > *** Entia non sunt multiplicanda praeter necessitatem *** > _______________________________________________ > sdn mailing list > sdn@irtf.org > https://www.irtf.org/mailman/listinfo/sdn From pedromj@um.es Tue Nov 12 07:55:43 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B3BBA21E827A for ; Tue, 12 Nov 2013 07:55:40 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -6.599 X-Spam-Level: X-Spam-Status: No, score=-6.599 tagged_above=-999 required=5 tests=[AWL=0.000, BAYES_00=-2.599, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id nTPzgzuL0h5m for ; Tue, 12 Nov 2013 07:55:33 -0800 (PST) Received: from xenon11.um.es (xenon11.um.es [155.54.212.165]) by ietfa.amsl.com (Postfix) with ESMTP id 0B05721E827D for ; Tue, 12 Nov 2013 07:55:32 -0800 (PST) Received: from localhost (localhost [127.0.0.1]) by xenon11.um.es (Postfix) with ESMTP id 5297D53C1B for ; Tue, 12 Nov 2013 16:55:31 +0100 (CET) X-Virus-Scanned: by antispam in UMU at xenon11.um.es Received: from xenon11.um.es ([127.0.0.1]) by localhost (xenon11.um.es [127.0.0.1]) (amavisd-new, port 10024) with LMTP id E99Ec18ZX79c for ; Tue, 12 Nov 2013 16:55:31 +0100 (CET) Received: from localhost (unknown [46.25.162.195]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) (Authenticated sender: pedromj@um.es) by xenon11.um.es (Postfix) with ESMTPSA id B767E53B9B for ; Tue, 12 Nov 2013 16:55:30 +0100 (CET) Date: Tue, 12 Nov 2013 16:55:30 +0100 From: Pedro Martinez-Julia To: sdn@irtf.org Message-ID: <20131112155530.GS18189@um.es> References: <66422454-39A4-40F0-BFF6-986BFC4CAF9A@riw.us> <016301cedfab$7620b620$62622260$@riw.us> <20131112152906.GP18189@um.es> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.22 (2013-10-16) Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 12 Nov 2013 15:55:43 -0000 On Tue, Nov 12, 2013 at 07:44:57AM -0800, David Meyer wrote: > > This is at the very least arguable. For example, if I configure > devices with some "management" interface will the network work as > expected say, without IP addresses on the interfaces? > I do not understand exactly what point are you meaning. If you configure a device, you are telling the device what are your expectations. If the configuration is wrong or partial, you are actually telling the device to work wrong or not to work (as you did not finish the configuration). > > --dmm > Regards, Pedro -- Pedro Martinez-Julia Department of Communication and Information Engineering Faculty of Computer Science University of Murcia Email: pedromj@um.es --------------------------------------------------------- *** Entia non sunt multiplicanda praeter necessitatem *** From hadi@mojatatu.com Tue Nov 12 08:02:23 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7C4D221E8294 for ; Tue, 12 Nov 2013 08:02:23 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.959 X-Spam-Level: X-Spam-Status: No, score=-102.959 tagged_above=-999 required=5 tests=[AWL=0.018, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, RCVD_IN_DNSWL_LOW=-1, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id A1RMKe5LLi0r for ; Tue, 12 Nov 2013 08:02:18 -0800 (PST) Received: from mail-vb0-f43.google.com (mail-vb0-f43.google.com [209.85.212.43]) by ietfa.amsl.com (Postfix) with ESMTP id F315121E828B for ; Tue, 12 Nov 2013 08:02:15 -0800 (PST) Received: by mail-vb0-f43.google.com with SMTP id w20so2570015vbb.16 for ; Tue, 12 Nov 2013 08:02:15 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc:content-type; bh=8PAT7ja8brOv82cvRpRvij+hOGfN8dwTmDb6wQMoN2o=; b=IJPKO1ei8/yAgQrwIBbY1fu+pJkO1iN5/p+OMnsDLwNWjrTi2VzfFMmUXAhlUKcccB BmS2mY8VdAfmTlPUYoJQvOLAPkidyk35HfmgxH6Dr6MyCiHCMUG/ATwQrIHHqtK4Sll8 UcsYiFsRrbCeisCNHS6WUKPossrQ1kpZwiWRCRZCcvCGVlPXJfbNV38FNgcwUgDZU4vr wGiB/L81EtNxs4ipJafBiOLzjc/6rq3cHTBz9u2ik3ZkllVr8U6Fv7w4lCzhqBvlZ6oy 6oEdsUDGHV42UPT+HNQyFtykuZ0bnOPl1rgAB/1OK4pveehV9yzXNk9AFnD7Ghw9Pt/N UDSw== X-Gm-Message-State: ALoCoQlZU2UcQ/I/r5ng6CxYbX6MOovL3TYog+nJlVtPhDmgo+V8jb8ZBG7lTrJzJ8ihKgRwqvqt X-Received: by 10.52.165.131 with SMTP id yy3mr8282980vdb.25.1384272135437; Tue, 12 Nov 2013 08:02:15 -0800 (PST) MIME-Version: 1.0 Received: by 10.58.8.19 with HTTP; Tue, 12 Nov 2013 08:01:55 -0800 (PST) In-Reply-To: References: <00dc01cedee6$327f9730$977ec590$@riw.us> <012501cedeea$7f46c120$7dd44360$@riw.us> <2329b8e07d8444a2808de812c4ea0e2a@exrad6.ad.rad.co.il> From: Jamal Hadi Salim Date: Tue, 12 Nov 2013 11:01:55 -0500 Message-ID: To: David Meyer Content-Type: text/plain; charset=ISO-8859-1 Cc: Russ White , Yaakov Stein , "sdn@irtf.org" Subject: Re: [Sdn] Timeliness WAS(Re: Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 12 Nov 2013 16:02:23 -0000 On Tue, Nov 12, 2013 at 10:25 AM, David Meyer wrote: > > I'm still not sure how to apply the idea of separation of timescales > here. In general the idea, at least in the systems literature, is that > if two processes operate on widely varying timescales (like an order > of magnitude or more) then one or the other can be approximated by a > constant (in "slower" case) or considered instantaneous (in the > "faster" case). This leads to vast simplification of mathematical > models. However, here we don't really have mathematical models of the > "planes" (save TCP). > >From an interface perspective, this is the interesting part to me: LB(convergence) = RTT(controller, switch) + PPT(controller) + PPT(switch) PPT(controller) + PPT(switch) is much higher in what is traditionally "management" vs "control" even if "management", using the same existing interfaces, is automated. This is because design intents for such _existing_ "management" interfaces is primarily not focussed on optimizing those two parameters. One of the arguements for netconf over SNMP was it was more human friendly for an operator to see ascii than debug cascaded OIDs. > If I understand what you are saying, I'm not sure you want to do that. > Consistency and Availability are different things, at least from the > CAP theorem perspective. > LB(convergence) points to the "C" in CAP. So yes. > I doubt that if OF had the same ACID properties that an interface like > netconf has that it would be faster. Whether you would want that is > another question. Well even if it did do ACID the PPT(controller) + PPT(switch) part of OF vs netconf would be a magnitude better. cheers, jamal From dmm@1-4-5.net Tue Nov 12 08:08:10 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A892D21E8257 for ; Tue, 12 Nov 2013 08:08:10 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.977 X-Spam-Level: X-Spam-Status: No, score=-2.977 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 0PiaUt6ASHpg for ; Tue, 12 Nov 2013 08:08:06 -0800 (PST) Received: from mail-oa0-f52.google.com (mail-oa0-f52.google.com [209.85.219.52]) by ietfa.amsl.com (Postfix) with ESMTP id 1FCCA21E829A for ; Tue, 12 Nov 2013 08:08:05 -0800 (PST) Received: by mail-oa0-f52.google.com with SMTP id o6so2927008oag.11 for ; Tue, 12 Nov 2013 08:07:57 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type; bh=AayaobQvOy6K1MMtSMIPCbqnr8xAsWTxZg4talaJj0k=; b=VVwn9txFEIe6MWz9vtNUdR1YYQR9yXVaA8kj7XmEdxooQw/wgHcpacBbB+rIoc+bQz Cu3PNI+pH1+vfTogC4gix8LM0CiIeaYy/B6sR3pDoGr31PfBF20c/I6pXVsZ08wvep3q /LtMrGkXQotEDs3Aekcy4xRHyFdO6jZMH98yx5OmdpPhgMn4MIlJq7yVYFTqCbpZWJyW F7/TFIqnslpT72jmuyISfiFbWE7m5RJHVuHyMpJYpPDAeym1VZhrbuxT3Lyb/ewdaZe9 i8FVIzK62YJzhN1hW6hZAYoCUhsKgsSYsA+C+LKf80/ZSR/z5OceshNLgHh58C7JvQcR 9/AQ== X-Gm-Message-State: ALoCoQn4ghVJ2R5ECG9jEAKnNlAgdlnW0rQ10RFYNFyK1D5QnoZsIIPDDp6y7a/hQmXA6aF3Sozh MIME-Version: 1.0 X-Received: by 10.60.34.4 with SMTP id v4mr1377147oei.101.1384272477036; Tue, 12 Nov 2013 08:07:57 -0800 (PST) Received: by 10.182.66.168 with HTTP; Tue, 12 Nov 2013 08:07:56 -0800 (PST) X-Originating-IP: [2001:468:d01:9c:2019:b35f:6ccf:d188] In-Reply-To: <20131112155530.GS18189@um.es> References: <66422454-39A4-40F0-BFF6-986BFC4CAF9A@riw.us> <016301cedfab$7620b620$62622260$@riw.us> <20131112152906.GP18189@um.es> <20131112155530.GS18189@um.es> Date: Tue, 12 Nov 2013 08:07:56 -0800 Message-ID: From: David Meyer To: Pedro Martinez-Julia Content-Type: text/plain; charset=ISO-8859-1 Cc: SDN IRTF list Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 12 Nov 2013 16:08:10 -0000 On Tue, Nov 12, 2013 at 7:55 AM, Pedro Martinez-Julia wrote: > On Tue, Nov 12, 2013 at 07:44:57AM -0800, David Meyer wrote: >> >> This is at the very least arguable. For example, if I configure >> devices with some "management" interface will the network work as >> expected say, without IP addresses on the interfaces? >> > > I do not understand exactly what point are you meaning. If you configure > a device, you are telling the device what are your expectations. If the > configuration is wrong or partial, you are actually telling the device > to work wrong or not to work (as you did not finish the configuration). > Your original text was: > Those functions/operations are not all part of the control plane. The > difference between the control plane and the management plane is that > the former is *required* by the network (or its individual devices) to > work as expected while the management plane is not strictly required but > permits to know the status and to define the *expected* behavior of the > network (or, also, individual devices). What I was driving at is defining something as "required" doesn't seem to help because the same discussion we've been having can be had in terms of required or not required. In addition, terms like "expected" behavior also not well defined. In addition the definition of "required" is confusing: the control plane is "required by the network to work as expected" while at the same time the management plane is used to "define the "expected" behavior...". --dmm >> >> --dmm >> > > Regards, > Pedro > > -- > Pedro Martinez-Julia > Department of Communication and Information Engineering > Faculty of Computer Science > University of Murcia > Email: pedromj@um.es > --------------------------------------------------------- > *** Entia non sunt multiplicanda praeter necessitatem *** > _______________________________________________ > sdn mailing list > sdn@irtf.org > https://www.irtf.org/mailman/listinfo/sdn From dmm@1-4-5.net Tue Nov 12 08:12:23 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id DC92121E829F for ; Tue, 12 Nov 2013 08:12:22 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.977 X-Spam-Level: X-Spam-Status: No, score=-2.977 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ApoyzweFb9cN for ; Tue, 12 Nov 2013 08:12:17 -0800 (PST) Received: from mail-oa0-f44.google.com (mail-oa0-f44.google.com [209.85.219.44]) by ietfa.amsl.com (Postfix) with ESMTP id 9C8CB21E8257 for ; Tue, 12 Nov 2013 08:12:11 -0800 (PST) Received: by mail-oa0-f44.google.com with SMTP id l6so2911747oag.17 for ; Tue, 12 Nov 2013 08:12:11 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type; bh=zB8gaT8VPKoTt4DS0ZhOvBs/h8hZUNI3ElHa3f2dAyU=; b=WhrDY5jkUHOyQsF7wEq3i4sPg42x01uJx2x3bM7enJOUlAeeXR2h8Pfs2tfw/EgKUW vIw2ZnJ+0GIrAlkTeUjFKCHZxDiDj2Plw3lXujJaylAb1SSgTX4nSByzlclkhtMeYnbD mU9PVCGwN4EELdsmD4etVa7ZUGqA5l9NodSQywEGdLp/Zy+AkbohPvnDNCpGRLnYTRke Bz6+EfMQVieYZ/7Cs//3kHZ7cfWSq0B0QPefAnGRI8QwjBWTNVVTYt8myC+2h6xfDCF8 KVy00I9GUmhJs+s6k8bXQPLqJE/lB0dopfGgE/VdVMtF6rgf0x888C4GEoQMdE3/iL/3 mr/w== X-Gm-Message-State: ALoCoQlJ92WbrknaMBTn4o+SrkOz1sVoGU0PRYDSb17DRSS6H0Ebj2TEV2MXLPlIIAoI00Mip4nw MIME-Version: 1.0 X-Received: by 10.60.34.4 with SMTP id v4mr1402269oei.101.1384272731119; Tue, 12 Nov 2013 08:12:11 -0800 (PST) Received: by 10.182.66.168 with HTTP; Tue, 12 Nov 2013 08:12:10 -0800 (PST) X-Originating-IP: [2001:468:d01:9c:2019:b35f:6ccf:d188] In-Reply-To: References: <00dc01cedee6$327f9730$977ec590$@riw.us> <012501cedeea$7f46c120$7dd44360$@riw.us> <2329b8e07d8444a2808de812c4ea0e2a@exrad6.ad.rad.co.il> Date: Tue, 12 Nov 2013 08:12:10 -0800 Message-ID: From: David Meyer To: Jamal Hadi Salim Content-Type: text/plain; charset=ISO-8859-1 Cc: Russ White , Yaakov Stein , "sdn@irtf.org" Subject: Re: [Sdn] Timeliness WAS(Re: Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 12 Nov 2013 16:12:23 -0000 On Tue, Nov 12, 2013 at 8:01 AM, Jamal Hadi Salim wrote: > On Tue, Nov 12, 2013 at 10:25 AM, David Meyer wrote: >> >> I'm still not sure how to apply the idea of separation of timescales >> here. In general the idea, at least in the systems literature, is that >> if two processes operate on widely varying timescales (like an order >> of magnitude or more) then one or the other can be approximated by a >> constant (in "slower" case) or considered instantaneous (in the >> "faster" case). This leads to vast simplification of mathematical >> models. However, here we don't really have mathematical models of the >> "planes" (save TCP). >> > > From an interface perspective, this is the interesting part to me: > > LB(convergence) = RTT(controller, switch) + PPT(controller) + PPT(switch) > > PPT(controller) + PPT(switch) is much higher in what is traditionally > "management" vs "control" even if "management", using the same > existing interfaces, is automated. This is because design intents for > such _existing_ "management" interfaces is primarily not focussed > on optimizing those two parameters. One of the arguements for > netconf over SNMP was it was more human friendly for an operator > to see ascii than debug cascaded OIDs. > >> If I understand what you are saying, I'm not sure you want to do that. >> Consistency and Availability are different things, at least from the >> CAP theorem perspective. >> > > LB(convergence) points to the "C" in CAP. So yes. > >> I doubt that if OF had the same ACID properties that an interface like >> netconf has that it would be faster. Whether you would want that is >> another question. > > Well even if it did do ACID the PPT(controller) + PPT(switch) part > of OF vs netconf would be a magnitude better. Can you back that up with experimental data (or anything else)? --dmm > > cheers, > jamal From pedromj@um.es Tue Nov 12 08:21:32 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5EECF21E80B8 for ; Tue, 12 Nov 2013 08:21:32 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -6.599 X-Spam-Level: X-Spam-Status: No, score=-6.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id hwYrCt1V3wwI for ; Tue, 12 Nov 2013 08:21:26 -0800 (PST) Received: from xenon14.um.es (xenon14.um.es [155.54.212.168]) by ietfa.amsl.com (Postfix) with ESMTP id 669C621E80A1 for ; Tue, 12 Nov 2013 08:21:26 -0800 (PST) Received: from localhost (localhost [127.0.0.1]) by xenon14.um.es (Postfix) with ESMTP id CEBA25D69B for ; Tue, 12 Nov 2013 17:21:24 +0100 (CET) X-Virus-Scanned: by antispam in UMU at xenon14.um.es Received: from xenon14.um.es ([127.0.0.1]) by localhost (xenon14.um.es [127.0.0.1]) (amavisd-new, port 10024) with LMTP id Kz8tW4d-2amq for ; Tue, 12 Nov 2013 17:21:24 +0100 (CET) Received: from localhost (unknown [46.25.162.195]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) (Authenticated sender: pedromj@um.es) by xenon14.um.es (Postfix) with ESMTPSA id 852565D699 for ; Tue, 12 Nov 2013 17:21:23 +0100 (CET) Date: Tue, 12 Nov 2013 17:21:23 +0100 From: Pedro Martinez-Julia To: sdn@irtf.org Message-ID: <20131112162123.GU18189@um.es> References: <66422454-39A4-40F0-BFF6-986BFC4CAF9A@riw.us> <016301cedfab$7620b620$62622260$@riw.us> <20131112152906.GP18189@um.es> <20131112155530.GS18189@um.es> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.22 (2013-10-16) Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 12 Nov 2013 16:21:32 -0000 On Tue, Nov 12, 2013 at 08:07:56AM -0800, David Meyer wrote: > > Your original text was: > > > Those functions/operations are not all part of the control plane. The > > difference between the control plane and the management plane is that > > the former is *required* by the network (or its individual devices) to > > work as expected while the management plane is not strictly required but > > permits to know the status and to define the *expected* behavior of the > > network (or, also, individual devices). > > What I was driving at is defining something as "required" doesn't seem > to help because the same discussion we've been having can be had in > terms of required or not required. In addition, terms like "expected" > behavior also not well defined. In addition the definition of > "required" is confusing: the control plane is "required by the network > to work as expected" while at the same time the management plane is > used to "define the "expected" behavior...". > I understand your point now. See this example: You buy, for example, a router and you plug it to your network without doing anything. In most cases, it will not do what you want it to do. Then you use a management application, which uses the "management plane" to interact with the device, and set the router with the addresses and the routing protocol it has to use. Then, without your intervention, the router will find other networks, routes, etch. In this example you can see that without the routing protocol, the device will not do what you want it to do, so the routing protocol in this example is "required" and it should be continuously running. However, after your initial configuration (or if the router comes pre-configured), unless there is a problem or a decision to change the operation, you will not have to use the "management plane" again. This is just to clarify my point. Feel free to read it without the words "required" or "expected behavior" but I think that the meaning, that can be more or less abstract, is clear. > --dmm > Regards, Pedro -- Pedro Martinez-Julia Department of Communication and Information Engineering Faculty of Computer Science University of Murcia Email: pedromj@um.es --------------------------------------------------------- *** Entia non sunt multiplicanda praeter necessitatem *** From dmm@1-4-5.net Tue Nov 12 08:32:20 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6409011E8190 for ; Tue, 12 Nov 2013 08:32:20 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.977 X-Spam-Level: X-Spam-Status: No, score=-2.977 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id fKfbPl3jbRDF for ; Tue, 12 Nov 2013 08:32:16 -0800 (PST) Received: from mail-oa0-f44.google.com (mail-oa0-f44.google.com [209.85.219.44]) by ietfa.amsl.com (Postfix) with ESMTP id 2BA3911E810C for ; Tue, 12 Nov 2013 08:32:16 -0800 (PST) Received: by mail-oa0-f44.google.com with SMTP id l6so2948228oag.17 for ; Tue, 12 Nov 2013 08:32:15 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type; bh=ExyTmNXNDpixCgWn1zO20mc3UCAgqPm6mCxkYJG5/0k=; b=Gd2Q7vW8YJV3wQoghzkN8G9FcYooam0cVxKIVzhh+KPjwutuDIc5i2ZvLpZABgjZwN +mwI1APBvQyikm+3bdkIDyNZYXVYs1NJikdTe5FiZuFcNXzq4eq5DKSuVfrA7Hqoto6C 8QQ/7RJ3yxhT6kqUCmcEWZJtPWhCx5ZuBWZw4Cj1k5eqcMtj39A8FlVuGK/QH8wbJr8V izx7Tl03stfA6/mB1GH1t6dIaTDGDwoZCQxbclocOqmgPa3I7nHDm0LReybGxRRVB+d/ 4I89QsAkiY+ZazOzCRI1rsMSQrLUnHUdbT5IkAw9BGeSYpRwXopgyxNlbWXrimerXyz7 QA4w== X-Gm-Message-State: ALoCoQmgIBdHhmdvvwo3RQkuE096wM98tr93OKUlTB5pwUZhmuWlRUNdUIsG2PT7mNfgHSQwmLLB MIME-Version: 1.0 X-Received: by 10.60.34.4 with SMTP id v4mr1512446oei.101.1384273935767; Tue, 12 Nov 2013 08:32:15 -0800 (PST) Received: by 10.182.66.168 with HTTP; Tue, 12 Nov 2013 08:32:15 -0800 (PST) X-Originating-IP: [2001:468:d01:9c:2019:b35f:6ccf:d188] In-Reply-To: <20131112162123.GU18189@um.es> References: <66422454-39A4-40F0-BFF6-986BFC4CAF9A@riw.us> <016301cedfab$7620b620$62622260$@riw.us> <20131112152906.GP18189@um.es> <20131112155530.GS18189@um.es> <20131112162123.GU18189@um.es> Date: Tue, 12 Nov 2013 08:32:15 -0800 Message-ID: From: David Meyer To: Pedro Martinez-Julia Content-Type: text/plain; charset=ISO-8859-1 Cc: SDN IRTF list Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 12 Nov 2013 16:32:20 -0000 On Tue, Nov 12, 2013 at 8:21 AM, Pedro Martinez-Julia wrote: > On Tue, Nov 12, 2013 at 08:07:56AM -0800, David Meyer wrote: >> >> Your original text was: >> >> > Those functions/operations are not all part of the control plane. The >> > difference between the control plane and the management plane is that >> > the former is *required* by the network (or its individual devices) to >> > work as expected while the management plane is not strictly required but >> > permits to know the status and to define the *expected* behavior of the >> > network (or, also, individual devices). >> >> What I was driving at is defining something as "required" doesn't seem >> to help because the same discussion we've been having can be had in >> terms of required or not required. In addition, terms like "expected" >> behavior also not well defined. In addition the definition of >> "required" is confusing: the control plane is "required by the network >> to work as expected" while at the same time the management plane is >> used to "define the "expected" behavior...". >> > > I understand your point now. See this example: > > You buy, for example, a router and you plug it to your network without > doing anything. In most cases, it will not do what you want it to do. > Then you use a management application, which uses the "management plane" > to interact with the device, and set the router with the addresses and > the routing protocol it has to use. Then, without your intervention, the > router will find other networks, routes, etch. Not if its an OpenFlow router... > > In this example you can see that without the routing protocol, the > device will not do what you want it to do, so the routing protocol in > this example is "required" and it should be continuously running. > However, after your initial configuration (or if the router comes > pre-configured), unless there is a problem or a decision to change the > operation, you will not have to use the "management plane" again. I get what you are saying. Somehow in your definition the control plane carries out an intended policy instantiated by the management plane. So long as there is no change in policy you don't need to run the management plane again. This seems to be back to the idea of persistent vs. ephemeral state...(the control plane installs ephemeral state, the management installs persistent state, right up until you have i2rs...). --dmm > > This is just to clarify my point. Feel free to read it without the words > "required" or "expected behavior" but I think that the meaning, that can > be more or less abstract, is clear. > >> --dmm >> > > Regards, > Pedro > > -- > Pedro Martinez-Julia > Department of Communication and Information Engineering > Faculty of Computer Science > University of Murcia > Email: pedromj@um.es > --------------------------------------------------------- > *** Entia non sunt multiplicanda praeter necessitatem *** > _______________________________________________ > sdn mailing list > sdn@irtf.org > https://www.irtf.org/mailman/listinfo/sdn From hadi@mojatatu.com Tue Nov 12 08:44:33 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0E5D911E8190 for ; Tue, 12 Nov 2013 08:44:33 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.96 X-Spam-Level: X-Spam-Status: No, score=-102.96 tagged_above=-999 required=5 tests=[AWL=0.017, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, RCVD_IN_DNSWL_LOW=-1, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id u2yeQuk2lLHP for ; Tue, 12 Nov 2013 08:44:28 -0800 (PST) Received: from mail-ve0-f179.google.com (mail-ve0-f179.google.com [209.85.128.179]) by ietfa.amsl.com (Postfix) with ESMTP id D2D7011E8106 for ; Tue, 12 Nov 2013 08:44:27 -0800 (PST) Received: by mail-ve0-f179.google.com with SMTP id oz11so3389007veb.24 for ; Tue, 12 Nov 2013 08:44:27 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc:content-type; bh=ewXrUVWLIIi3i8E+xTOTCtSDtkeepOg+mv4xeP13c6Q=; b=NwLd1cDfvawxDTtQeMOazjR+ZPeAY5XlvfDANTnqBXCKVsXEIVhyUuF064Vx7IJ8O2 bmP9eFi8NTfzJ2UOFdYiBGJ2fvEd+HMmAmJwWZ++5uBKTmJC8KUiu1rQi4uMdmN4dpl1 r8eMxrZoTKzB2H3MZMc0yYsCjt6sgyNNZ7eY1B1Uperve6/p115b2qPF11eF/uQrROEE EjUyKJAzy7NE6LeDcA/vnYsHPeeHRlSINGXIHVPUHLjxl5DoHKApDm/rYbN4w9kR4k0l jqYJkeeM08OZROtL9IC5QJ55+Oad9G34NptSnwvhQqptYcpkA4c39PkulInatO8yy2Tm ebag== X-Gm-Message-State: ALoCoQlbzJeZC3ihbHws2cTF6To6QNiC7+HG5qAH0X0j5f9mWbxwpJPXGCQWHGMMyhDzqkqntURc X-Received: by 10.58.6.239 with SMTP id e15mr2504127vea.29.1384274667306; Tue, 12 Nov 2013 08:44:27 -0800 (PST) MIME-Version: 1.0 Received: by 10.58.8.19 with HTTP; Tue, 12 Nov 2013 08:44:07 -0800 (PST) In-Reply-To: References: <00dc01cedee6$327f9730$977ec590$@riw.us> <012501cedeea$7f46c120$7dd44360$@riw.us> <2329b8e07d8444a2808de812c4ea0e2a@exrad6.ad.rad.co.il> From: Jamal Hadi Salim Date: Tue, 12 Nov 2013 11:44:07 -0500 Message-ID: To: David Meyer Content-Type: text/plain; charset=ISO-8859-1 Cc: Russ White , Yaakov Stein , "sdn@irtf.org" Subject: Re: [Sdn] Timeliness WAS(Re: Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 12 Nov 2013 16:44:33 -0000 On Tue, Nov 12, 2013 at 11:12 AM, David Meyer wrote: > Can you back that up with experimental data (or anything else)? Lets start with "anything else" and talk about the 3 classical schedule-able resources (cpu, bandwidth, memory): 1) OF is binary meaning simpler for a machine to parse, XML or any other ascii format would be more expensive. So more cpu resources needed. Modern X86 have built in string parsing built in (making its way to the clibraries already), so overhead of a netconf message indicating "set table foo value X" while high is alleviated. But your switch tiny 32 bit ppc will be much higher; handwave, an order of magnitude. 2) OF being binary consumes less wire resources than ascii. several orders of magnitudes less. 3) OF being binary consumes less RAM. Probably not as a big deal since this would be a transient use. As to "experimental" data - I think this would make an interesting paper, so lets see if i can convince someone to work with me on it ;-> cheers, jamal From fjros@um.es Tue Nov 12 09:27:47 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 031BA11E80FE for ; Tue, 12 Nov 2013 09:27:47 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -3.299 X-Spam-Level: X-Spam-Status: No, score=-3.299 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, MIME_8BIT_HEADER=0.3, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Q1ne6Cx1CYGZ for ; Tue, 12 Nov 2013 09:27:42 -0800 (PST) Received: from xenon13.um.es (xenon13.um.es [155.54.212.167]) by ietfa.amsl.com (Postfix) with ESMTP id 083A321E80B2 for ; Tue, 12 Nov 2013 09:27:38 -0800 (PST) Received: from localhost (localhost [127.0.0.1]) by xenon13.um.es (Postfix) with ESMTP id A9A695D655; Tue, 12 Nov 2013 18:27:35 +0100 (CET) X-Virus-Scanned: by antispam in UMU at xenon13.um.es Received: from xenon13.um.es ([127.0.0.1]) by localhost (xenon13.um.es [127.0.0.1]) (amavisd-new, port 10024) with LMTP id nEYDbC8fuXtN; Tue, 12 Nov 2013 18:27:35 +0100 (CET) Received: from [192.168.1.4] (84.121.4.22.dyn.user.ono.com [84.121.4.22]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) (Authenticated sender: fjros) by xenon13.um.es (Postfix) with ESMTPSA id 7CF395D63B; Tue, 12 Nov 2013 18:27:34 +0100 (CET) Mime-Version: 1.0 (Apple Message framework v1085) Content-Type: text/plain; charset=iso-8859-1 From: =?iso-8859-1?Q?Francisco_Javier_Ros_Mu=F1oz?= In-Reply-To: Date: Tue, 12 Nov 2013 18:27:33 +0100 Content-Transfer-Encoding: quoted-printable Message-Id: <96FD8097-66D9-4744-9A04-6800A5E7C631@um.es> References: <66422454-39A4-40F0-BFF6-986BFC4CAF9A@riw.us> <016301cedfab$7620b620$62622260$@riw.us> <20131112152906.GP18189@um.es> <20131112155530.GS18189@um.es> <20131112162123.GU18189@um.es> To: David Meyer X-Mailer: Apple Mail (2.1085) Cc: SDN IRTF list , Pedro Martinez-Julia Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 12 Nov 2013 17:27:47 -0000 Hi David, El 12/11/2013, a las 17:32, David Meyer escribi=F3: > On Tue, Nov 12, 2013 at 8:21 AM, Pedro Martinez-Julia = wrote: >> On Tue, Nov 12, 2013 at 08:07:56AM -0800, David Meyer wrote: >>>=20 >>> Your original text was: >>>=20 >>>> Those functions/operations are not all part of the control plane. = The >>>> difference between the control plane and the management plane is = that >>>> the former is *required* by the network (or its individual devices) = to >>>> work as expected while the management plane is not strictly = required but >>>> permits to know the status and to define the *expected* behavior of = the >>>> network (or, also, individual devices). >>>=20 >>> What I was driving at is defining something as "required" doesn't = seem >>> to help because the same discussion we've been having can be had in >>> terms of required or not required. In addition, terms like = "expected" >>> behavior also not well defined. In addition the definition of >>> "required" is confusing: the control plane is "required by the = network >>> to work as expected" while at the same time the management plane is >>> used to "define the "expected" behavior...". >>>=20 >>=20 >> I understand your point now. See this example: >>=20 >> You buy, for example, a router and you plug it to your network = without >> doing anything. In most cases, it will not do what you want it to do. >> Then you use a management application, which uses the "management = plane" >> to interact with the device, and set the router with the addresses = and >> the routing protocol it has to use. Then, without your intervention, = the >> router will find other networks, routes, etch. >=20 > Not if its an OpenFlow router... >=20 I'd say that you still have differentiated management and control = protocols in this case: Management: CLI, OF-CONFIG, OVSDB, etc Control: OF Best, fran >>=20 >> In this example you can see that without the routing protocol, the >> device will not do what you want it to do, so the routing protocol in >> this example is "required" and it should be continuously running. >> However, after your initial configuration (or if the router comes >> pre-configured), unless there is a problem or a decision to change = the >> operation, you will not have to use the "management plane" again. >=20 >=20 > I get what you are saying. Somehow in your definition the control > plane carries out an intended policy instantiated by the management > plane. So long as there is no change in policy you don't need to run > the management plane again. This seems to be back to the idea of > persistent vs. ephemeral state...(the control plane installs ephemeral > state, the management installs persistent state, right up until you > have i2rs...). >=20 > --dmm >=20 >>=20 >> This is just to clarify my point. Feel free to read it without the = words >> "required" or "expected behavior" but I think that the meaning, that = can >> be more or less abstract, is clear. >>=20 >>> --dmm >>>=20 >>=20 >> Regards, >> Pedro >>=20 >> -- >> Pedro Martinez-Julia >> Department of Communication and Information Engineering >> Faculty of Computer Science >> University of Murcia >> Email: pedromj@um.es >> --------------------------------------------------------- >> *** Entia non sunt multiplicanda praeter necessitatem *** >> _______________________________________________ >> sdn mailing list >> sdn@irtf.org >> https://www.irtf.org/mailman/listinfo/sdn > _______________________________________________ > sdn mailing list > sdn@irtf.org > https://www.irtf.org/mailman/listinfo/sdn -- Francisco J. Ros, PhD Dept. of Information and Communications Engineering University of Murcia, Murcia (Spain) http://masimum.inf.um.es/fjrm/ From yaakov_s@rad.com Tue Nov 12 09:54:43 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2539311E80FE for ; Tue, 12 Nov 2013 09:54:43 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.287 X-Spam-Level: X-Spam-Status: No, score=-102.287 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HOST_MISMATCH_COM=0.311, UNPARSEABLE_RELAY=0.001, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id oqVQYsQFDtX4 for ; Tue, 12 Nov 2013 09:54:38 -0800 (PST) Received: from rad.co.il (mailrelay01-ib1.rad.com [94.188.133.165]) by ietfa.amsl.com (Postfix) with ESMTP id E38A311E80E4 for ; Tue, 12 Nov 2013 09:54:37 -0800 (PST) Received: from Internal Mail-Server by MailRelay01 (envelope-from yaakov?s@rad.com) with RC4-SHA encrypted SMTP; 12 Nov 2013 19:54:35 +0200 Received: from EXRAD6.ad.rad.co.il (2002:c072:18be::c072:18be) by exrad6.ad.rad.co.il (2002:c072:18be::c072:18be) with Microsoft SMTP Server (TLS) id 15.0.712.24; Tue, 12 Nov 2013 19:54:27 +0200 Received: from EXRAD6.ad.rad.co.il ([fe80::95ed:2d3a:ffd9:390a]) by exrad6.ad.rad.co.il ([fe80::95ed:2d3a:ffd9:390a%20]) with mapi id 15.00.0712.012; Tue, 12 Nov 2013 19:54:27 +0200 From: Yaakov Stein To: Pedro Martinez-Julia , "sdn@irtf.org" Thread-Topic: [Sdn] Thoughts on Defining control and Management Planes Thread-Index: AQHO2xqln5belLyQLUuIkuyZNXbJhJoZGb3QgAC95ACABeaIIIAAC20AgAAwjYD///glgIAAB/KAgAACtoCAAACRgIAAVwZA///lPoCAAa/GAA== Date: Tue, 12 Nov 2013 17:54:27 +0000 Message-ID: <7b32a8ff3ccf4e5d86cd5a41aa1586ef@exrad6.ad.rad.co.il> References: <001301ceded0$ab50b4c0$01f21e40$@riw.us> <4d2ee44e6fcb4dd18a26f8bc33c8abf1@exrad6.ad.rad.co.il> <00d201cedee5$039eaa10$0adbfe30$@riw.us> <20131111141907.GO17999@um.es> <012601cedeea$a00097b0$e001c710$@riw.us> <114475f8112547b2bab678eca08278cb@exrad6.ad.rad.co.il> <20131111180633.GD18189@um.es> In-Reply-To: <20131111180633.GD18189@um.es> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [192.115.243.62] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Commtouch-Refid: str=0001.0A090206.52826B5B.0066, ss=1, re=0.100, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0 (Unknown) Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 12 Nov 2013 17:54:43 -0000 Like all OAM functions, they are linked to the layer or plane they monitor. So there IS control plane OAM, but it is not the BFD that fate shares with = the data, it consists of the keepalive messages protocol of the control protocol, which fate share with the control messages. And similarly, the management plane has its own OAM. If the control or management plane messages travel over different links from the data traffic, their OAM travel those links as well. Y(J)S -----Original Message----- From: sdn-bounces@irtf.org [mailto:sdn-bounces@irtf.org] On Behalf Of Pedro= Martinez-Julia Sent: 11 November, 2013 20:07 To: sdn@irtf.org Subject: Re: [Sdn] Thoughts on Defining control and Management Planes On Mon, Nov 11, 2013 at 05:43:26PM +0000, Yaakov Stein wrote: > No, BFD is data plane. >=20 > Control plane protocols can be sent out-of-band; would out-of-band BFD=20 > mean anything ? > It would but you cannot achieve the objective without actually crossing the= link you are testing. However, it is still control plane because the objec= tive is the control, not to forward data. Remember that packet content in d= ata plane does mean nothing to intermediate devices, just to the source and= destination. >=20 > Y(J)S > Regards, Pedro -- Pedro Martinez-Julia Department of Communication and Information Engineering Faculty of Computer= Science University of Murcia Email: pedromj@um.es --------------------------------------------------------- *** Entia non sunt multiplicanda praeter necessitatem *** _________________= ______________________________ sdn mailing list sdn@irtf.org https://www.irtf.org/mailman/listinfo/sdn From sriganeshkini@gmail.com Tue Nov 12 09:57:38 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 806D011E8149 for ; Tue, 12 Nov 2013 09:57:37 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.978 X-Spam-Level: X-Spam-Status: No, score=-1.978 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id oA29eBFBMUUn for ; Tue, 12 Nov 2013 09:57:37 -0800 (PST) Received: from mail-pa0-x22b.google.com (mail-pa0-x22b.google.com [IPv6:2607:f8b0:400e:c03::22b]) by ietfa.amsl.com (Postfix) with ESMTP id 371F511E8147 for ; Tue, 12 Nov 2013 09:57:35 -0800 (PST) Received: by mail-pa0-f43.google.com with SMTP id fa1so3497059pad.2 for ; Tue, 12 Nov 2013 09:57:35 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:from:date:message-id :subject:to:cc:content-type; bh=yyfNIWnybh/mt89cemt0UOaCDNhJHoONiKWvj+7ppFs=; b=cOO3Z4EyBFNHxOf2e189yv6GTUaat3zkbS4xaHWOO2mAM9HThOGQTdpSMwFUM3Uy/K 80Qx3A/HRMiUZE3aW8jT95WfKj5qP5Jpvg+k+YTSyPPxL3lx0LTuAYIo0WVYS4H+Estz 5WbzASw3QOWwuDgOpCvd8BFQzEQRo/DHQAOTqVmmLiOaBci3D6agV0FC7q5YWuFF9gnn 49dfY90t6t2aDRuSahnYOJsGoTzuWC/JdpBGTlksaUzb45l0QO1veNgnkCejwHy0euft ry+J7i9BP4RkTpOWyTafQxY/w1BUVgkgiIgr95dQIW3rDqt5p6lYALUkhP2gLRMcB9kU ylww== X-Received: by 10.66.217.166 with SMTP id oz6mr37905564pac.22.1384279054832; Tue, 12 Nov 2013 09:57:34 -0800 (PST) MIME-Version: 1.0 Sender: sriganeshkini@gmail.com Received: by 10.70.0.228 with HTTP; Tue, 12 Nov 2013 09:57:04 -0800 (PST) In-Reply-To: References: <001301ceded0$ab50b4c0$01f21e40$@riw.us> <4d2ee44e6fcb4dd18a26f8bc33c8abf1@exrad6.ad.rad.co.il> <00d201cedee5$039eaa10$0adbfe30$@riw.us> <20131111141907.GO17999@um.es> <012601cedeea$a00097b0$e001c710$@riw.us> <640DC4F7-33C2-4E24-A0D0-BB1609AE108C@cisco.com> <4D6BF497-AA24-4E5B-AC0C-DF8FB56B4759@cisco.com> <5E5AEAFC-FFC2-4917-A243-CFC3F121ACA6@cisco.com> From: Sriganesh Kini Date: Tue, 12 Nov 2013 09:57:04 -0800 X-Google-Sender-Auth: 4PiEGy_AUQUZ70AsfumeEhCgIUY Message-ID: To: Jamal Hadi Salim Content-Type: text/plain; charset=UTF-8 Cc: Russ White , "Carlos Pignataro \(cpignata\)" , SDN IRTF list , Pedro Martinez-Julia , Robert Raszuk Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 12 Nov 2013 17:57:38 -0000 Keep aside the implementation specific (i.e. "sits on an FE/Line card/switch") and see what its function is. From your description of the function I would classify that "application" as part of the control-plane. On Tue, Nov 12, 2013 at 4:17 AM, Jamal Hadi Salim wrote: > So one thing we struggled with, and seems related to this thread, was what > to call an application that sits on an FE/Line card/switch. Consider for example > an app that is offloading ARP or one that is offloading OSPF hellos. It sits in > the line card. On occasion it updates something to the CE. I dont know what > you want to call such a thing which is a helper to some control application. > We called it an application. > > cheers, > jamal > [snip] From yaakov_s@rad.com Tue Nov 12 10:01:24 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 96C9911E80FA for ; Tue, 12 Nov 2013 10:01:23 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.287 X-Spam-Level: X-Spam-Status: No, score=-102.287 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HOST_MISMATCH_COM=0.311, UNPARSEABLE_RELAY=0.001, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ZjIbuBrQysD6 for ; Tue, 12 Nov 2013 10:01:18 -0800 (PST) Received: from rad.co.il (mailrelay01-ib2.rad.com [91.143.228.146]) by ietfa.amsl.com (Postfix) with ESMTP id 6A48611E8142 for ; Tue, 12 Nov 2013 10:01:09 -0800 (PST) Received: from Internal Mail-Server by MailRelay01 (envelope-from yaakov?s@rad.com) with RC4-SHA encrypted SMTP; 12 Nov 2013 20:01:05 +0200 Received: from EXRAD6.ad.rad.co.il (2002:c072:18be::c072:18be) by exrad6.ad.rad.co.il (2002:c072:18be::c072:18be) with Microsoft SMTP Server (TLS) id 15.0.712.24; Tue, 12 Nov 2013 20:00:46 +0200 Received: from EXRAD6.ad.rad.co.il ([fe80::95ed:2d3a:ffd9:390a]) by exrad6.ad.rad.co.il ([fe80::95ed:2d3a:ffd9:390a%20]) with mapi id 15.00.0712.012; Tue, 12 Nov 2013 20:00:45 +0200 From: Yaakov Stein To: "Carlos Pignataro (cpignata)" , Pedro Martinez-Julia Thread-Topic: [Sdn] Thoughts on Defining control and Management Planes Thread-Index: AQHO2xqln5belLyQLUuIkuyZNXbJhJoZGb3QgAC95ACABeaIIIAAC20AgAAwjYD///glgIAAB/KAgAACtoCAAAhmgIAAdWQAgAFv2JA= Date: Tue, 12 Nov 2013 18:00:45 +0000 Message-ID: <293b14764bcd44e495597695bfe72257@exrad6.ad.rad.co.il> References: <001301ceded0$ab50b4c0$01f21e40$@riw.us> <4d2ee44e6fcb4dd18a26f8bc33c8abf1@exrad6.ad.rad.co.il> <00d201cedee5$039eaa10$0adbfe30$@riw.us> <20131111141907.GO17999@um.es> <20131111145853.GA18189@um.es> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [192.115.243.62] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Commtouch-Refid: str=0001.0A090203.52826CE2.004D, ss=1, re=0.100, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0 (Unknown) Cc: SDN IRTF list Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 12 Nov 2013 18:01:24 -0000 > On the other hand, if BFD is just used to know the health of links, it=20 > can effectively be considered part of the management plane. No, that is maintenance (which is what the M in OAM stands for), not manage= ment. Y(J)S -----Original Message----- From: sdn-bounces@irtf.org [mailto:sdn-bounces@irtf.org] On Behalf Of Carlo= s Pignataro (cpignata) Sent: 11 November, 2013 23:59 To: Pedro Martinez-Julia Cc: SDN IRTF list Subject: Re: [Sdn] Thoughts on Defining control and Management Planes On Nov 11, 2013, at 9:58 AM, Pedro Martinez-Julia wrote: > On Mon, Nov 11, 2013 at 03:28:49PM +0100, Robert Raszuk wrote: >> How would you classify BFD running between two devices ? To which=20 >> plane in your "very clear" model does it belong ? >>=20 >=20 > For me, th BFD protocol is classified as control plane because it will=20 > affect to the forwarding behavior (if BFD is connected to the device=20 > forwarding tables). Management functions and protocols can affect the forwarding behavior as we= ll. I think this was mentioned in the meeting as well, in the context of co= nfig management of control plane vs. a platform. > The reason for not being part of the data plane is obvious, it does=20 > not forwards packets form other entities. It is not from a management=20 > plane because its objective is not to communicate administrative=20 > decisions. >=20 > On the other hand, if BFD is just used to know the health of links, it=20 > can effectively be considered part of the management plane. This can=20 > be an example of how the same protocol may operate for the control=20 > plane or for the management plane, but it does not break the=20 > boundaries among the planes, just demonstrates that the classification=20 > should be applied to running functions/protocols, not to their architectu= re. Yes. Does this also help? http://tools.ietf.org/html/draft-shore-icmp-aup-06#section-4 Thanks, -- Carlos. >=20 >> Best, >> r. >=20 > Regards, > Pedro >=20 > -- > Pedro Martinez-Julia > Department of Communication and Information Engineering Faculty of=20 > Computer Science University of Murcia > Email: pedromj@um.es > --------------------------------------------------------- > *** Entia non sunt multiplicanda praeter necessitatem ***=20 > _______________________________________________ > sdn mailing list > sdn@irtf.org > https://www.irtf.org/mailman/listinfo/sdn From yaakov_s@rad.com Tue Nov 12 10:04:46 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5472D11E815C for ; Tue, 12 Nov 2013 10:04:46 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.286 X-Spam-Level: X-Spam-Status: No, score=-102.286 tagged_above=-999 required=5 tests=[AWL=-0.000, BAYES_00=-2.599, HOST_MISMATCH_COM=0.311, HTML_MESSAGE=0.001, UNPARSEABLE_RELAY=0.001, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id CUkqvpCEasJ1 for ; Tue, 12 Nov 2013 10:04:41 -0800 (PST) Received: from rad.co.il (mailrelay02-ib2.rad.com [91.143.228.147]) by ietfa.amsl.com (Postfix) with ESMTP id EB14511E8126 for ; Tue, 12 Nov 2013 10:04:40 -0800 (PST) Received: from Internal Mail-Server by MailRelay02 (envelope-from yaakov?s@rad.com) with RC4-SHA encrypted SMTP; 12 Nov 2013 20:04:37 +0200 Received: from EXRAD6.ad.rad.co.il (2002:c072:18be::c072:18be) by exrad6.ad.rad.co.il (2002:c072:18be::c072:18be) with Microsoft SMTP Server (TLS) id 15.0.712.24; Tue, 12 Nov 2013 20:04:36 +0200 Received: from EXRAD6.ad.rad.co.il ([fe80::95ed:2d3a:ffd9:390a]) by exrad6.ad.rad.co.il ([fe80::95ed:2d3a:ffd9:390a%20]) with mapi id 15.00.0712.012; Tue, 12 Nov 2013 20:04:36 +0200 From: Yaakov Stein To: "Carlos Pignataro (cpignata)" , Robert Raszuk Thread-Topic: [Sdn] Thoughts on Defining control and Management Planes Thread-Index: AQHO2xqrn5belLyQLUuIkuyZNXbJhJoZhQKAgADYuwCABdNIAIAAHq4AgAAjTgCAAAVjgIAAB/KAgAACtoCAAACRgIAAe0sAgAAB0oCAAAQQgIAAAucAgAACdQCAAOIBQA== Date: Tue, 12 Nov 2013 18:04:35 +0000 Message-ID: <410e8165758c4d5a84e1eca546c0c10c@exrad6.ad.rad.co.il> References: <001301ceded0$ab50b4c0$01f21e40$@riw.us> <4d2ee44e6fcb4dd18a26f8bc33c8abf1@exrad6.ad.rad.co.il> <00d201cedee5$039eaa10$0adbfe30$@riw.us> <20131111141907.GO17999@um.es> <012601cedeea$a00097b0$e001c710$@riw.us> <640DC4F7-33C2-4E24-A0D0-BB1609AE108C@cisco.com> <6347AD1C-4BB4-4AED-861C-99371B7C64D6@cisco.com> <48E055C8-5AB5-4A57-A7EF-848725E4A261@cisco.com> In-Reply-To: <48E055C8-5AB5-4A57-A7EF-848725E4A261@cisco.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [192.115.243.62] Content-Type: multipart/alternative; boundary="_000_410e8165758c4d5a84e1eca546c0c10cexrad6adradcoil_" MIME-Version: 1.0 X-Commtouch-Refid: str=0001.0A090208.52826DB6.001A, ss=1, re=0.100, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0 (Unknown) Cc: Russ White , SDN IRTF list , Pedro Martinez-Julia Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 12 Nov 2013 18:04:46 -0000 --_000_410e8165758c4d5a84e1eca546c0c10cexrad6adradcoil_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Carlos, I agree with most of what you say here. BFD is a data plane OAM function, which can trigger control plane functions. It may have a management plane function to configure it (e.g., by setting v= alues in the BFD MIB), and it may store counters for the management plane to retrieve (e.g., via S= NMP). Y(J)S From: sdn-bounces@irtf.org [mailto:sdn-bounces@irtf.org] On Behalf Of Carlo= s Pignataro (cpignata) Sent: 12 November, 2013 00:32 To: Robert Raszuk Cc: Russ White; SDN IRTF list; Pedro Martinez-Julia Subject: Re: [Sdn] Thoughts on Defining control and Management Planes Robert, On Nov 11, 2013, at 5:23 PM, Robert Raszuk > wrote: My comment was not regarding BFD RFC and its interoperability, but to your point of BFD client being routing protocol as number one. It is just one of many and for real use case of BFD not the most important one. You missed my point. My point was that BFD does not modify forwarding. My point was that BFD signals its clients, and other functions or protocols= (bfd clients) take action. Your partial mis-quote of my comment edited out the key elements of my res= ponse. Let me try again: "Not necessarily. It's a protocol that notifies a client, and that client c= an be a routing protocol that would modify forwarding, or the client can be= a notification to an NMS that will log it without impact to forwarding. Th= e client can event be just a stub with no "action". " Number one? Maybe you misread and were commenting on something you thought = you were reading? In fact BFD very often brings interface down, then rest of events just happen. So BFD does not directly communicate in this case with any routing protocol. Nope. There is a reason why this draft did not progress: http://tools.ietf.org/html/draft-shen-bfd-intf-p2p-nbr-00 ("Interface Based= Point-to-Point Neighbor BFD") This draft says: This document describes a special application for BFD over point-to-point physical or logical circuits. This application is not a normal BFD client such as upper layer routing protocol, but it is a management element for circuit itself where BFD is required and configured. ... INTF-P2P Neighbor BFD is an application of BFD [3], the client is the interface where BFD service is required. Best, Carlos. Rgs, R. On Mon, Nov 11, 2013 at 11:13 PM, Carlos Pignataro (cpignata) > wrote: On Nov 11, 2013, at 4:58 PM, Robert Raszuk > wrote: It's a protocol that notifies a client, and that client can be a routing protocol that would modify forwarding, Nope ... sorry :) Please see http://tools.ietf.org/html/rfc5882#section-4 I understand local optimizations, and certainly BFD's interaction with clie= nts is mostly an implementation issue, but: http://tools.ietf.org/html/rfc5880 BFD can be abstracted as a simple service. The service primitives provided by BFD are to create, destroy, and modify a session, given the destination address and other parameters. BFD in return provides a signal to its clients indicating when the BFD session goes up or down. http://tools.ietf.org/html/rfc5882 It is important to remember that the interaction between BFD and its client applications has essentially no interoperability issues, because BFD is acting in an advisory nature (similar to hardware signaling the loss of light on a fiber optic circuit, for example) and existing mechanisms in the client applications are used in reaction to BFD events. In fact, BFD may interact with only one of a pair of systems for a particular client application without any ill effect. etc. That would be way too slow. BFD notification to routing protocol is just side product. BFD #1 goal is to notify forwarding hardware which switches over to backup path at the line card level without *any* action from RP. That switchover takes order of single miliseconds in modern hardware. The detection time is the longest to react to link/node failure. Note that backup paths are already pre-programmed and pre-resolved. Only few 100s of ms later RP takes actions to correct the entries reinstalling in make before break fashion new products of SPF and new set of backup paths. See above. Thanks, -- Carlos. Best, R. _______________________________________________ sdn mailing list sdn@irtf.org https://www.irtf.org/mailman/listinfo/sdn --_000_410e8165758c4d5a84e1eca546c0c10cexrad6adradcoil_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Carlos,

 <= /p>

I agree with most of what= you say here.

 <= /p>

BFD is a data plane OAM f= unction,

which can trigger control= plane functions.

 <= /p>

It may have a management = plane function to configure it (e.g., by setting values in the BFD MIB),

and it may store counters= for the management plane to retrieve (e.g., via SNMP).

 <= /p>

Y(J)S

 <= /p>

From: sdn-boun= ces@irtf.org [mailto:sdn-bounces@irtf.org] On Behalf Of Carlos Pignataro (cpignata)
Sent: 12 November, 2013 00:32
To: Robert Raszuk
Cc: Russ White; SDN IRTF list; Pedro Martinez-Julia
Subject: Re: [Sdn] Thoughts on Defining control and Management Plane= s

 

Robert,

 

On Nov 11, 2013, at 5:23 PM, Robert Raszuk <robert@raszuk.net> wrote:=



My comment was not regarding BFD RFC and its interop= erability, but to
your point of BFD client being routing protocol as number one. It is
just one of many and for real use case of BFD not the most important
one.

 

You missed my point.

 

My point was that BFD does not modify forwarding.

 

My point was that BFD signals its clients, and other= functions or protocols (bfd clients) take action.

 

Your partial mis-quote  of my comment edited ou= t the key elements of my response. Let me try again:

 

"Not necessarily. It's a protocol that notifies= a client, and that client can be a routing protocol that would modify forw= arding, or the client can be a notification to an NMS that will log it with= out impact to forwarding. The client can event be just a stub with no "action". "

 

Number one? Maybe you misread and were commenting on= something you thought you were reading?




In fact BFD very often brings interface down, then rest of events just
happen. So BFD does not directly communicate in this case with any
routing protocol.

 

Nope.

 

There is a reason why this draft did not progress:

http://tools.ietf.org/html/draft-shen-bfd-intf-p2p-nbr-00= ("Interface Based Point-to-Point Neighbor BFD")

 

This draft says:

   This document describes a special application for BFD ove=
r
   point-to-point physical or logical circuits. This applica=
tion
   is not a normal BFD client such as upper layer routing
   protocol, but it is a management element for circuit itse=
lf
   where BFD is required and configured.

...

   INTF-P2P Neighbor BFD is an application of BFD [3], the client is
   the interface where BFD service is required. <=
/pre>



Best,

 

Carlos.




Rgs,
R.

On Mon, Nov 11, 2013 at 11:13 PM, Carlos Pignataro (cpignata)
<cpignata@cisco.com> wrote:=


On Nov 11, 2013, at 4:58 PM, Robert Raszuk <robert@raszuk.net> wrote:


It's a protocol that notifies a client, and that cli= ent can be a routing
protocol that would modify forwarding,


Nope ... sorry :)


Please see http://= tools.ietf.org/html/rfc5882#section-4

I understand local optimizations, and certainly BFD's interaction with clie= nts is mostly an implementation issue, but:

http://tools.ietf.org/html/r= fc5880
  BFD can be abstracted as a simple service.  The service pr= imitives
  provided by BFD are to create, destroy, and modify a session, g= iven
  the destination address and other parameters.  BFD in retu= rn provides
  a signal to its clients indicating when the BFD session goes up= or
  down.
http://tools.ietf.org/html/r= fc5882

  It is important to remember that the interaction between BFD an= d its
  client applications has essentially no interoperability issues,=
  because BFD is acting in an advisory nature (similar to hardwar= e
  signaling the loss of light on a fiber optic circuit, for examp= le)
  and existing mechanisms in the client applications are used in<= br>   reaction to BFD events.  In fact, BFD may interact with on= ly one of a
  pair of systems for a particular client application without any= ill
  effect.
etc.



That would be way too slow. BFD notification to routing protocol is
just side product. BFD #1 goal is to notify forwarding hardware which
switches over to backup path at the line card level without *any*
action from RP. That switchover takes order of single miliseconds in
modern hardware. The detection time is the longest to react to
link/node failure.

Note that backup paths are already pre-programmed and pre-resolved.
Only few 100s of ms later RP takes actions to correct the entries
reinstalling in make before break fashion new products of SPF and new
set of backup paths.


See above.

Thanks,

-- Carlos.



Best,
R.
_______________________________________________
sdn mailing list
sdn@irtf.org
https://www.irtf.org/= mailman/listinfo/sdn

 

 

--_000_410e8165758c4d5a84e1eca546c0c10cexrad6adradcoil_-- From yaakov_s@rad.com Tue Nov 12 10:08:56 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 023D721F9D52 for ; Tue, 12 Nov 2013 10:08:56 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.286 X-Spam-Level: X-Spam-Status: No, score=-102.286 tagged_above=-999 required=5 tests=[AWL=-0.000, BAYES_00=-2.599, HOST_MISMATCH_COM=0.311, HTML_MESSAGE=0.001, UNPARSEABLE_RELAY=0.001, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id yNfnv+keMhmh for ; Tue, 12 Nov 2013 10:08:51 -0800 (PST) Received: from rad.co.il (mailrelay01-ib2.rad.com [91.143.228.146]) by ietfa.amsl.com (Postfix) with ESMTP id 6C66721F9D34 for ; Tue, 12 Nov 2013 10:08:50 -0800 (PST) Received: from Internal Mail-Server by MailRelay01 (envelope-from yaakov?s@rad.com) with RC4-SHA encrypted SMTP; 12 Nov 2013 20:08:47 +0200 Received: from EXRAD6.ad.rad.co.il (2002:c072:18be::c072:18be) by exrad6.ad.rad.co.il (2002:c072:18be::c072:18be) with Microsoft SMTP Server (TLS) id 15.0.712.24; Tue, 12 Nov 2013 20:08:46 +0200 Received: from EXRAD6.ad.rad.co.il ([fe80::95ed:2d3a:ffd9:390a]) by exrad6.ad.rad.co.il ([fe80::95ed:2d3a:ffd9:390a%20]) with mapi id 15.00.0712.012; Tue, 12 Nov 2013 20:08:46 +0200 From: Yaakov Stein To: Russ White , 'Robert Raszuk' , "'Pedro Martinez-Julia'" Thread-Topic: [Sdn] Thoughts on Defining control and Management Planes Thread-Index: AQHO3zlen5belLyQLUuIkuyZNXbJhJoh5RsQ Date: Tue, 12 Nov 2013 18:08:46 +0000 Message-ID: <242ec170d2f04b40b635cab3a547faa2@exrad6.ad.rad.co.il> References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [192.115.243.62] Content-Type: multipart/alternative; boundary="_000_242ec170d2f04b40b635cab3a547faa2exrad6adradcoil_" MIME-Version: 1.0 X-Commtouch-Refid: str=0001.0A090206.52826EB0.0040, ss=1, re=0.100, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0 (Unknown) Cc: 'SDN IRTF list' Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 12 Nov 2013 18:08:56 -0000 --_000_242ec170d2f04b40b635cab3a547faa2exrad6adradcoil_ Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 PiBUaGVuIHJvdXRlZCBpcCBuZXR3b3JrcyBkb24ndCBoYXZlIGEgbWFuYWdlbWVudCBwbGFuZQ0K DQpTdXJlIHRoZXkgZG8uIEZvciBleGFtcGxlIGZvciBzdGF0aWMgcm91dGVzLg0KQW5kIG9mIGNv dXJzZSBmb3IgY29uZmlndXJpbmcgb3RoZXIgcm91dGVyIGZ1bmN0aW9uYWxpdHkuDQoNClRodXMg aW4gYW4gSURSIHNldHRpbmcgYSBtYW5hZ2VtZW50IHBsYW5lIG9wZXJhdGlvbiBjb3VsZCB0ZWxs 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X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX188YnI+DQpzZG4gbWFpbGluZyBsaXN0 PGJyPg0KPGEgaHJlZj0ibWFpbHRvOnNkbkBpcnRmLm9yZyI+c2RuQGlydGYub3JnPC9hPjxicj4N CjxhIGhyZWY9Imh0dHBzOi8vd3d3LmlydGYub3JnL21haWxtYW4vbGlzdGluZm8vc2RuIj5odHRw czovL3d3dy5pcnRmLm9yZy9tYWlsbWFuL2xpc3RpbmZvL3NkbjwvYT48bzpwPjwvbzpwPjwvcD4N CjwvZGl2Pg0KPC9ib2R5Pg0KPC9odG1sPg0K --_000_242ec170d2f04b40b635cab3a547faa2exrad6adradcoil_-- From yaakov_s@rad.com Tue Nov 12 10:21:13 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A2BA511E811B for ; Tue, 12 Nov 2013 10:21:13 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.287 X-Spam-Level: X-Spam-Status: No, score=-102.287 tagged_above=-999 required=5 tests=[AWL=0.000, BAYES_00=-2.599, HOST_MISMATCH_COM=0.311, UNPARSEABLE_RELAY=0.001, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id xKUDeqLNapf5 for ; Tue, 12 Nov 2013 10:21:08 -0800 (PST) Received: from rad.co.il (mailrelay01-ib2.rad.com [91.143.228.146]) by ietfa.amsl.com (Postfix) with ESMTP id 7533711E810A for ; Tue, 12 Nov 2013 10:20:58 -0800 (PST) Received: from Internal Mail-Server by MailRelay01 (envelope-from yaakov?s@rad.com) with RC4-SHA encrypted SMTP; 12 Nov 2013 20:20:55 +0200 Received: from EXRAD6.ad.rad.co.il (2002:c072:18be::c072:18be) by exrad6.ad.rad.co.il (2002:c072:18be::c072:18be) with Microsoft SMTP Server (TLS) id 15.0.712.24; Tue, 12 Nov 2013 20:20:54 +0200 Received: from EXRAD6.ad.rad.co.il ([fe80::95ed:2d3a:ffd9:390a]) by exrad6.ad.rad.co.il ([fe80::95ed:2d3a:ffd9:390a%20]) with mapi id 15.00.0712.012; Tue, 12 Nov 2013 20:20:54 +0200 From: Yaakov Stein To: Jamal Hadi Salim Thread-Topic: [Sdn] Timeliness WAS(Re: Thoughts on Defining control and Management Planes Thread-Index: AQHO35q+lgcM1MEOwUabIdZejEy86Zoh5j4g Date: Tue, 12 Nov 2013 18:20:54 +0000 Message-ID: References: <00dc01cedee6$327f9730$977ec590$@riw.us> <012501cedeea$7f46c120$7dd44360$@riw.us> <2329b8e07d8444a2808de812c4ea0e2a@exrad6.ad.rad.co.il> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [192.115.243.62] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Commtouch-Refid: str=0001.0A090205.52827188.0085, ss=1, re=0.100, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0 (Unknown) Cc: Russ White , David Meyer , "sdn@irtf.org" Subject: Re: [Sdn] Timeliness WAS(Re: Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 12 Nov 2013 18:21:13 -0000 No, consistency and availability are quite different Consistency means that if you sent two packet in rapid succession, they would be handled in the same (and hopefully correct) way. Availability means that the packet is immediately handled, even if incorrec= tly. So, if in OF you start a new flow, the packet is not matched and so is sent= to the controller. The flow now hangs until the controller receives the packet, figures out wh= at to do with the flow, and configures all the match tables of all the swit= ches. This is a lack of availability. >From now on the packets belonging to the flow are all handled consistently. What happens if a link breaks ? In a well-engineered network protection switching immediately compensates,= =20 thus guaranteeing availability, even if the packets are now handled differe= ntly (lack of consistency). In a best-effort OSPF network, a link-down will cause the router before the= break to immediately Dijkstra the next packet along a new path - also availabilit= y at the expense of consistency. The new path may even lead to black-holing= - really inconsistent behavior. What happens if we need to send a packet belonging to a new flow to the con= troller and the controller (or a link to it) fails ? Then either we can wait until the controller CAN respond (unavailable) or decide to forward according to conventional (pre-SDN) methods (inconsist= ent). Y(J)S -----Original Message----- From: Jamal Hadi Salim [mailto:hadi@mojatatu.com]=20 Sent: 12 November, 2013 13:31 To: Yaakov Stein Cc: Russ White; David Meyer; sdn@irtf.org Subject: Re: [Sdn] Timeliness WAS(Re: Thoughts on Defining control and Mana= gement Planes On Mon, Nov 11, 2013 at 12:48 PM, Yaakov Stein wrote: > No, we needn't put absolute times. > Ok, agreed. I was hoping there would be a good paper to what Dave Meyer pointed out here: http://cmg.soton.ac.uk/research/projects/separation-of-timescales-in-models= -of-complex-networks/ > The times of importance are those that would signify unavailability for t= he particular application. > > Thus for interactive applications the times would be shorter than for pro= gressive download ones. > > In the old days when voice was the only application, 100 ms was the=20 > gold standard, and so protection switching was required to be mo more tha= n 50 ms. I think what you say above may help me make the point. Can we equate "consistency" to what you refer to as "unavailability"? i.e. if i was able to update a FIB table at 10K/s then i would be able to r= each consistency faster than if i did it at 1K/s Given that design intent o= f "management" interfaces was mostly targeted for human interaction both fr= om usability as well as response tolerances - does automation change the f= act that they are still constrained to that original design intent? I think= not. Just because i can automate a CLI with expect does not magically change tha= t it is slow (my tie to sense of urgency that offended Russ ;->). I can update tables a magnitude faster with OF than with netconf. Both are = called SDN technologies. cheers, jamal From fjros@um.es Tue Nov 12 10:40:02 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 225C011E8121 for ; Tue, 12 Nov 2013 10:40:02 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.799 X-Spam-Level: X-Spam-Status: No, score=-4.799 tagged_above=-999 required=5 tests=[AWL=1.500, BAYES_00=-2.599, MIME_8BIT_HEADER=0.3, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id RrKPDP-ug7A9 for ; Tue, 12 Nov 2013 10:39:57 -0800 (PST) Received: from xenon14.um.es (xenon14.um.es [155.54.212.168]) by ietfa.amsl.com (Postfix) with ESMTP id 92C4821F9FAB for ; Tue, 12 Nov 2013 10:39:35 -0800 (PST) Received: from localhost (localhost [127.0.0.1]) by xenon14.um.es (Postfix) with ESMTP id 5C13E5D6AC; Tue, 12 Nov 2013 19:39:33 +0100 (CET) X-Virus-Scanned: by antispam in UMU at xenon14.um.es Received: from xenon14.um.es ([127.0.0.1]) by localhost (xenon14.um.es [127.0.0.1]) (amavisd-new, port 10024) with LMTP id g7702ZRDAOlz; Tue, 12 Nov 2013 19:39:32 +0100 (CET) Received: from [192.168.1.4] (84.121.4.22.dyn.user.ono.com [84.121.4.22]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) (Authenticated sender: fjros) by xenon14.um.es (Postfix) with ESMTPSA id 3A0EB5D6B0; Tue, 12 Nov 2013 19:39:30 +0100 (CET) Mime-Version: 1.0 (Apple Message framework v1085) Content-Type: text/plain; charset=iso-8859-1 From: =?iso-8859-1?Q?Francisco_Javier_Ros_Mu=F1oz?= In-Reply-To: <015901cedfaa$45291e00$cf7b5a00$@riw.us> Date: Tue, 12 Nov 2013 19:39:30 +0100 Content-Transfer-Encoding: quoted-printable Message-Id: <2C13C475-1295-4CAA-8B3A-4AD08FA65C8C@um.es> References: <001301ceded0$ab50b4c0$01f21e40$@riw.us> <4d2ee44e6fcb4dd18a26f8bc33c8abf1@exrad6.ad.rad.co.il> <00d201cedee5$039eaa10$0adbfe30$@riw.us> <20131111141907.GO17999@um.es> <012601cedeea$a00097b0$e001c710$@riw.us> <640DC4F7-33C2-4E24-A0D0-BB1609AE108C@cisco.com> <4D6BF497-AA24-4E5B-AC0C-DF8FB56B4759@cisco.com> <015901cedfaa$45291e00$cf7b5a00$@riw.us> To: Russ White X-Mailer: Apple Mail (2.1085) Cc: "'Carlos Pignataro \(cpignata\)'" , 'SDN IRTF list' , 'Robert Raszuk' , 'Pedro Martinez-Julia' , 'Sriganesh Kini' Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 12 Nov 2013 18:40:02 -0000 Hi everyone, Ahh, terminology... it has killed some WGs in the past :-) I'm not very keen on spending too many WG cycles on terminology issues, = but it seems that there are quite different understandings out there. = Assuming that we really need such definitions, I agree with Russ on the = way to go to achieve them. So here's my view, although I'm not sure if it adds something given that = I've had to skim some emails in order to catch up with this thread: * The Management Plane is responsible for the configuration and = monitoring of data plane (ports, queues, etc) and control plane = (routing, QoS, filtering, etc) resources. * The Control Plane is responsible for determining the fate of packets = that enter the device. Each packet belongs to a specific forwarding = group (equivalence class) depending on its content. For each forwarding = group, the Control Plane decides whether such packets must be dropped or = forwarded. If the decision is to forward the packets, the control plane = establishes the appropriate output port(s), the treatment that packets = receive while buffered within the device, and the required actions on = their protocol headers before they leave the device. * The Data Plane inspects incoming packets in order to classify them = into a forwarding group as specified by the Control Plane. After = classification, the Data Plane implements the corresponding actions that = have been determined by the Control Plane for that forwarding group. Obviously, the former applies to both physical and virtual devices. My two cents, fran El 12/11/2013, a las 14:22, Russ White escribi=F3: >=20 >>> We seem to be using control-plane and routing-protocols as synonyms. >>> They are not. Routing protocols are considered part of the control >>> plane. But that does not mean that the control-plane consists only = of >>> the routing-protocols. >=20 > I hope not... What I think we need is a device centric, functionally = based > model of these different planes. We don't want: >=20 > - Time based models, because timing changes over time with = capabilities and > requirements, and because we want to be able to understand what the = timing > requirements are, rather than assuming them in the definition. With a = time > based model, if you ask, "how long should it take for a control plane = to > converge and update the data plane," the answer is, "if it converges = in less > than x ms, then it's all data plane." That answer simply doesn't = convey any > useful information. >=20 > - Service based models, because services must know what to control to = build > the service they want to create. But unless we know what an actual > forwarding device looks like in terms of function, we can't figure out = the > interfaces and dynamics of actually modifying that forwarding device. = So we > need service based models, but we definitely need a device centric > functional model for the service models to interact with. >=20 > - Network based models --same as the service based models above. >=20 > I specifically don't want us to consider where the process runs, how = long it > takes, whether a human is (or has traditionally been) involved or not, = what > services are being offered, what role this device plays in the overall = plan > of the network, etc. The only question that should matter in a model = that > will actually help us understand what an individual forwarding device = looks > like is: >=20 > What does this process or protocol do in relationship to the action of > forwarding packets? >=20 > Certainly we can disagree about where any particular protocol fits = into such > a model, but none of that should invalidate the model -- it should = simply > help us understand the interactions between the pieces better. In = fact, the > entire discussion over BFD is centered around what BFD does, and how = it > interacts with other stuff -- not on its place in a larger scheme of > services, or "because it's so fast, it must be data plane," etc. In = other > words, we're implicitly assuming a device centric functionality based = model > in our heads in the process of arguing for the non-usefulness of just = such a > model. >=20 > Once we have a device centric functional model in place, then we can = build a > plethora of service and network models, and see how they interact = --what > interfaces there need to be, what those interfaces need to look like, = the > timing between the interfaces, what happens if we try and build two > different service models on top of a single physical network, etc. If = we > start with a services or network model, we're all going to be = propounding > different devices with different capabilities and different interfaces = to > get to our favorite set of services --and we'll end up with no actual = set of > common api's or idea what one device sitting in an actual rack = forwarding > real packets would need to do in relation to the plethora of service = and > network models we've created. If we start with a time based model, = we're > going to end up with a mash of stuff all in the data plane, because = someone > can always think of at least one solid use case to make any given > monitoring, configuration, or any other task as fast as actually = switching a > packet. >=20 > The reason our presentations are all over the place is that we're all > working from different models in different worlds --we need a point of > contact (or context) where all the models meet and interact, so we can = see > how to actually build real networks with this stuff. Until we get = there, > we're going to be out wandering the weeds. > =09 > :-) >=20 > Russ >=20 >=20 >=20 > _______________________________________________ > sdn mailing list > sdn@irtf.org > https://www.irtf.org/mailman/listinfo/sdn -- Francisco J. Ros, PhD Dept. of Information and Communications Engineering University of Murcia, Murcia (Spain) http://masimum.inf.um.es/fjrm/ From fjros@um.es Tue Nov 12 10:45:22 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id DC3C811E8171 for ; Tue, 12 Nov 2013 10:45:22 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -5.549 X-Spam-Level: X-Spam-Status: No, score=-5.549 tagged_above=-999 required=5 tests=[AWL=0.749, BAYES_00=-2.599, HTML_MESSAGE=0.001, MIME_8BIT_HEADER=0.3, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id P5QlzPIpujKl for ; Tue, 12 Nov 2013 10:45:18 -0800 (PST) Received: from xenon11.um.es (xenon11.um.es [155.54.212.165]) by ietfa.amsl.com (Postfix) with ESMTP id 269C511E817C for ; Tue, 12 Nov 2013 10:45:17 -0800 (PST) Received: from localhost (localhost [127.0.0.1]) by xenon11.um.es (Postfix) with ESMTP id 6AC5253BAA; Tue, 12 Nov 2013 19:45:16 +0100 (CET) X-Virus-Scanned: by antispam in UMU at xenon11.um.es Received: from xenon11.um.es ([127.0.0.1]) by localhost (xenon11.um.es [127.0.0.1]) (amavisd-new, port 10024) with LMTP id Ao-9XLeSvQij; Tue, 12 Nov 2013 19:45:15 +0100 (CET) Received: from [192.168.1.4] (84.121.4.22.dyn.user.ono.com [84.121.4.22]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) (Authenticated sender: fjros) by xenon11.um.es (Postfix) with ESMTPSA id 2B9AC53C15; Tue, 12 Nov 2013 19:45:14 +0100 (CET) Mime-Version: 1.0 (Apple Message framework v1085) Content-Type: multipart/alternative; boundary=Apple-Mail-1-100304843 From: =?iso-8859-1?Q?Francisco_Javier_Ros_Mu=F1oz?= In-Reply-To: <242ec170d2f04b40b635cab3a547faa2@exrad6.ad.rad.co.il> Date: Tue, 12 Nov 2013 19:45:14 +0100 Message-Id: References: <242ec170d2f04b40b635cab3a547faa2@exrad6.ad.rad.co.il> To: Yaakov Stein X-Mailer: Apple Mail (2.1085) Cc: Russ White , 'SDN IRTF list' , 'Pedro Martinez-Julia' , 'Robert Raszuk' Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 12 Nov 2013 18:45:23 -0000 --Apple-Mail-1-100304843 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 Just as an exercise... According to my proposed definition, adding a static route is a control = plane operation because it decides the fate of some packets. On the contrary, configuring an IP address is a management operation = (since it configures a resource) that triggers a control plane operation = (adding a routing entry that decides the fate of some packets). Yep, I know that some of you won't like this ;-) Best, fran El 12/11/2013, a las 19:08, Yaakov Stein escribi=C3=B3: > > Then routed ip networks don't have a management plane > =20 > Sure they do. For example for static routes. > And of course for configuring other router functionality. > =20 > Thus in an IDR setting a management plane operation could tell a = router to try to avoid a certain path > (because the peering would be expensive), > which the control plane would then respect and prefer a different = route, > which the data plane packets then take. > =20 > Simple. > =20 > Also simple to discover the CAP tradeoffs that led us to do it this = way. > =20 > Y(J)S > =20 > From: Russ White [mailto:russw@riw.us]=20 > Sent: 12 November, 2013 01:55 > To: Yaakov Stein; 'Robert Raszuk'; 'Pedro Martinez-Julia' > Cc: 'SDN IRTF list' > Subject: RE: [Sdn] Thoughts on Defining control and Management Planes > =20 >=20 > Then routed ip networks don't have a management plane... But this is = another problem with classifying these planes by there characteristics = rather than their function. >=20 > What functional difference does it make how the packet gets there? >=20 > :-) >=20 > Russ > From: Yaakov Stein > Sent: =E2=80=8E11/=E2=80=8E11/=E2=80=8E2013 12:43 PM > To: Russ White; 'Robert Raszuk'; 'Pedro Martinez-Julia' > Cc: 'SDN IRTF list' > Subject: RE: [Sdn] Thoughts on Defining control and Management Planes >=20 > No, BFD is data plane. >=20 > Control plane protocols can be sent out-of-band; > would out-of-band BFD mean anything ? >=20 >=20 >=20 > Y(J)S >=20 >=20 > -----Original Message----- > From: sdn-bounces@irtf.org [mailto:sdn-bounces@irtf.org] On Behalf Of = Russ White > Sent: 11 November, 2013 16:31 > To: 'Robert Raszuk'; 'Pedro Martinez-Julia' > Cc: 'SDN IRTF list' > Subject: Re: [Sdn] Thoughts on Defining control and Management Planes >=20 >=20 > > How would you classify BFD running between two devices ? To which=20 > > plane in your "very clear" model does it belong ? >=20 > The control plane --it is a protocol which impacts the information = used to actually forward packets. Speed doesn't matter, function does. >=20 > :-) >=20 > Russ >=20 >=20 > _______________________________________________ > sdn mailing list > sdn@irtf.org > https://www.irtf.org/mailman/listinfo/sdn > _______________________________________________ > sdn mailing list > sdn@irtf.org > https://www.irtf.org/mailman/listinfo/sdn -- Francisco J. Ros, PhD Dept. of Information and Communications Engineering University of Murcia, Murcia (Spain) http://masimum.inf.um.es/fjrm/ --Apple-Mail-1-100304843 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8 Just as an exercise...

According = to my proposed definition, adding a static route is a control plane = operation because it decides the fate of some packets.
On the = contrary, configuring an IP address is a management operation (since it = configures a resource) that triggers a control plane operation (adding a = routing entry that decides the fate of some = packets).

Yep, I know that some of you won't = like this = ;-)

Best,
fran

=
El 12/11/2013, a las 19:08, Yaakov Stein escribi=C3=B3:

 Then = routed ip networks don't have a management plane
 
Sure they do. For example for = static routes.
And = of course for configuring other router = functionality.
Thus = in an IDR setting a management plane operation could tell a router to = try to avoid a certain path
(because the peering would be = expensive),
which = the control plane would then respect and prefer a different = route,
which = the data plane packets then take.
Also = simple to discover the CAP tradeoffs that led us to do it this = way.
From: Russ White = [mailto:russw@riw.us] 
Sent: 12 November, 2013 = 01:55
To: Yaakov Stein; 'Robert = Raszuk'; 'Pedro Martinez-Julia'
Cc: 'SDN IRTF = list'
Subject: RE: [Sdn] Thoughts on = Defining control and Management = Planes

Then routed ip networks = don't have a management plane... But this is another problem with = classifying these planes by there characteristics rather than their = function.

What functional difference does it make how the packet = gets = there?

:-)

Russ

From: Yaakov Stein
Sent: 11/=E2=80=8E11/=E2=80=8E2013 12:43 PM
To: Russ White; 'Robert Raszuk'; 'Pedro Martinez-Julia'
Cc: 'SDN IRTF list'
Subject: RE: [Sdn] = Thoughts on Defining control and Management = Planes

No, BFD is data = plane.

Control plane protocols can be sent out-of-band;
would = out-of-band BFD mean anything = ?



Y(J)S


-----Original = Message-----
From: sdn-bounces@irtf.org [mailto:sdn-bounces@irtf.org] On Behalf = Of Russ White
Sent: 11 November, 2013 16:31
To: 'Robert Raszuk'; = 'Pedro Martinez-Julia'
Cc: 'SDN IRTF list'
Subject: Re: [Sdn] = Thoughts on Defining control and Management Planes


> How = would you classify BFD running between two devices ? To which 
> plane in your = "very clear" model does it belong ?

The control plane --it is a = protocol which impacts the information used to actually forward packets. = Speed doesn't matter, function = does.

:-)

Russ


__________________________________= _____________
sdn mailing list
sdn@irtf.org



= --Apple-Mail-1-100304843-- From pedromj@um.es Tue Nov 12 11:26:39 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6301B21E80AC for ; Tue, 12 Nov 2013 11:26:39 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.474 X-Spam-Level: X-Spam-Status: No, score=-4.474 tagged_above=-999 required=5 tests=[AWL=-0.875, BAYES_00=-2.599, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 1qtYzVIDdBMr for ; Tue, 12 Nov 2013 11:26:30 -0800 (PST) Received: from xenon13.um.es (xenon13.um.es [155.54.212.167]) by ietfa.amsl.com (Postfix) with ESMTP id D209321E80A1 for ; Tue, 12 Nov 2013 11:26:29 -0800 (PST) Received: from localhost (localhost [127.0.0.1]) by xenon13.um.es (Postfix) with ESMTP id 21FF35D94C for ; Tue, 12 Nov 2013 20:26:25 +0100 (CET) X-Virus-Scanned: by antispam in UMU at xenon13.um.es Received: from xenon13.um.es ([127.0.0.1]) by localhost (xenon13.um.es [127.0.0.1]) (amavisd-new, port 10024) with LMTP id U2dia0CjWphN for ; Tue, 12 Nov 2013 20:26:24 +0100 (CET) Received: from localhost (1.Red-88-25-205.staticIP.rima-tde.net [88.25.205.1]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) (Authenticated sender: pedromj@um.es) by xenon13.um.es (Postfix) with ESMTPSA id 9CC5E5D948 for ; Tue, 12 Nov 2013 20:26:24 +0100 (CET) Date: Tue, 12 Nov 2013 20:26:24 +0100 From: Pedro Martinez-Julia To: sdn@irtf.org Message-ID: <20131112192624.GV18189@um.es> References: <242ec170d2f04b40b635cab3a547faa2@exrad6.ad.rad.co.il> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: User-Agent: Mutt/1.5.22 (2013-10-16) Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 12 Nov 2013 19:26:39 -0000 On Tue, Nov 12, 2013 at 07:45:14PM +0100, Francisco Javier Ros Muñoz wrote: > Just as an exercise... > > According to my proposed definition, adding a static route is a control plane operation because it decides the fate of some packets. > On the contrary, configuring an IP address is a management operation (since it configures a resource) that triggers a control plane operation (adding a routing entry that decides the fate of some packets). > > Yep, I know that some of you won't like this ;-) > According to functionality, and my point of view, "adding a static route" belongs to the control plane if triggered by an operational decision (the router does not know how to reach network XX) but it belongs to the management plane if triggered by an administrative decision (we want to use this link instead of the one determined by OSPF). As I said before, the same protocol/operation may be classified into different planes according to the function it does. > Best, > fran > Regards, Pedro -- Pedro Martinez-Julia Department of Communication and Information Engineering Faculty of Computer Science University of Murcia Email: pedromj@um.es --------------------------------------------------------- *** Entia non sunt multiplicanda praeter necessitatem *** From hadi@mojatatu.com Tue Nov 12 11:55:29 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9360811E811B for ; Tue, 12 Nov 2013 11:55:28 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.961 X-Spam-Level: X-Spam-Status: No, score=-102.961 tagged_above=-999 required=5 tests=[AWL=0.016, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, RCVD_IN_DNSWL_LOW=-1, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id H++unKylgxRc for ; Tue, 12 Nov 2013 11:55:24 -0800 (PST) Received: from mail-ve0-f170.google.com (mail-ve0-f170.google.com [209.85.128.170]) by ietfa.amsl.com (Postfix) with ESMTP id 017FE21F9F21 for ; Tue, 12 Nov 2013 11:55:23 -0800 (PST) Received: by mail-ve0-f170.google.com with SMTP id db12so1880811veb.1 for ; Tue, 12 Nov 2013 11:55:23 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc:content-type:content-transfer-encoding; bh=wMrIi/Ghi6OdThxOPmvrm5Wr/+mW7QzjJe/gchLEOlo=; b=Dia9fKJzahJDDS/qcomnVk4P300iZ4yJzh/S0CxnZT8/gZHVT2uPBVyKCpNBcbsInM u7lF6xppRBkJSvjVE+mkw3XohLoJAML8aLgajVpaFMIwrD6thNcb7L+cdnr9x+nqgP69 hhhYLV92iTscDEd9GUFaM3aosOw/ZBZ3tArci4K6hnVObzm5rIRw44HWzZzL/zEHj1YC ps48kwDvNBwwnGSkbepzRde5esoZ4eP9/RYEA/fDzSG+6Xl1dulufbtGoBLTFub3bQUm bl0UgcKQksOTg12H69rwbk6lLQhhjE9Wbd/nsJDdnhDJb92sQTBxwcP18lLOjRO1PwWM CV5w== X-Gm-Message-State: ALoCoQm4SR9B5V2BpLbgmfc6WqbL8G3znyGzMzjIW51SspvrwgJiujAmhACvo7+wiJ+D7xq/JgKv X-Received: by 10.52.118.98 with SMTP id kl2mr3710708vdb.30.1384286123407; Tue, 12 Nov 2013 11:55:23 -0800 (PST) MIME-Version: 1.0 Received: by 10.58.8.19 with HTTP; Tue, 12 Nov 2013 11:55:03 -0800 (PST) In-Reply-To: References: <00dc01cedee6$327f9730$977ec590$@riw.us> <012501cedeea$7f46c120$7dd44360$@riw.us> <2329b8e07d8444a2808de812c4ea0e2a@exrad6.ad.rad.co.il> From: Jamal Hadi Salim Date: Tue, 12 Nov 2013 14:55:03 -0500 Message-ID: To: Yaakov Stein Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Cc: Russ White , David Meyer , "sdn@irtf.org" Subject: Re: [Sdn] Timeliness WAS(Re: Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 12 Nov 2013 19:55:29 -0000 Yaakov, Thanks for the insight. So question: for lack of better wording, is the "accelaration" (or maybe it= is "velocity") towards consistency unimportant? IOW, If i can update a 500K FIB table 100x faster with ForCES than with Net= conf, does that not make them different? cheers, jamal PS:- I am not here to judge merits of the two, i think they have their plac= e. If updating the tables was unimportant and usability is more important i wo= uld likely pick netconf. This is what we set out to do and i dont think the mes= sage is getting across. On Tue, Nov 12, 2013 at 1:20 PM, Yaakov Stein wrote: > No, consistency and availability are quite different > > Consistency means that if you sent two packet in rapid succession, > they would be handled in the same (and hopefully correct) way. > > Availability means that the packet is immediately handled, even if incorr= ectly. > > So, if in OF you start a new flow, the packet is not matched and so is se= nt to the controller. > The flow now hangs until the controller receives the packet, figures out = what to do with the flow, and configures all the match tables of all the sw= itches. > This is a lack of availability. > From now on the packets belonging to the flow are all handled consistentl= y. > > What happens if a link breaks ? > In a well-engineered network protection switching immediately compensates= , > thus guaranteeing availability, even if the packets are now handled diffe= rently (lack of consistency). > In a best-effort OSPF network, a link-down will cause the router before t= he break > to immediately Dijkstra the next packet along a new path - also availabil= ity at the expense of consistency. The new path may even lead to black-holi= ng - really inconsistent behavior. > > What happens if we need to send a packet belonging to a new flow to the c= ontroller > and the controller (or a link to it) fails ? > Then either we can wait until the controller CAN respond (unavailable) > or decide to forward according to conventional (pre-SDN) methods (inconsi= stent). > > Y(J)S > > > -----Original Message----- > From: Jamal Hadi Salim [mailto:hadi@mojatatu.com] > Sent: 12 November, 2013 13:31 > To: Yaakov Stein > Cc: Russ White; David Meyer; sdn@irtf.org > Subject: Re: [Sdn] Timeliness WAS(Re: Thoughts on Defining control and Ma= nagement Planes > > On Mon, Nov 11, 2013 at 12:48 PM, Yaakov Stein wrote: >> No, we needn't put absolute times. >> > > Ok, agreed. > I was hoping there would be a good paper to what Dave Meyer pointed out > here: > http://cmg.soton.ac.uk/research/projects/separation-of-timescales-in-mode= ls-of-complex-networks/ > >> The times of importance are those that would signify unavailability for = the particular application. >> >> Thus for interactive applications the times would be shorter than for pr= ogressive download ones. >> >> In the old days when voice was the only application, 100 ms was the >> gold standard, and so protection switching was required to be mo more th= an 50 ms. > > I think what you say above may help me make the point. > Can we equate "consistency" to what you refer to as "unavailability"? > i.e. if i was able to update a FIB table at 10K/s then i would be able to= reach consistency faster than if i did it at 1K/s Given that design intent= of "management" interfaces was mostly targeted for human interaction both = from usability as well as response tolerances - does automation change the= fact that they are still constrained to that original design intent? I thi= nk not. > Just because i can automate a CLI with expect does not magically change t= hat it is slow (my tie to sense of urgency that offended Russ ;->). > I can update tables a magnitude faster with OF than with netconf. Both ar= e called SDN technologies. > > cheers, > jamal From fjros@um.es Tue Nov 12 12:07:10 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 64D1811E810A for ; Tue, 12 Nov 2013 12:07:09 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -5.799 X-Spam-Level: X-Spam-Status: No, score=-5.799 tagged_above=-999 required=5 tests=[AWL=0.500, BAYES_00=-2.599, MIME_8BIT_HEADER=0.3, RCVD_IN_DNSWL_MED=-4] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id jqnzYrM1aksO for ; Tue, 12 Nov 2013 12:06:58 -0800 (PST) Received: from xenon12.um.es (xenon12.um.es [155.54.212.166]) by ietfa.amsl.com (Postfix) with ESMTP id 1FF4C11E80E6 for ; Tue, 12 Nov 2013 12:06:57 -0800 (PST) Received: from localhost (localhost [127.0.0.1]) by xenon12.um.es (Postfix) with ESMTP id E1D164C75F for ; Tue, 12 Nov 2013 21:06:56 +0100 (CET) X-Virus-Scanned: by antispam in UMU at xenon12.um.es Received: from xenon12.um.es ([127.0.0.1]) by localhost (xenon12.um.es [127.0.0.1]) (amavisd-new, port 10024) with LMTP id NYA+ebIhjZit; Tue, 12 Nov 2013 21:06:56 +0100 (CET) Received: from [192.168.1.4] (84.121.4.22.dyn.user.ono.com [84.121.4.22]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) (Authenticated sender: fjros) by xenon12.um.es (Postfix) with ESMTPSA id 88C024C658; Tue, 12 Nov 2013 21:06:55 +0100 (CET) Mime-Version: 1.0 (Apple Message framework v1085) Content-Type: text/plain; charset=iso-8859-1 From: =?iso-8859-1?Q?Francisco_Javier_Ros_Mu=F1oz?= In-Reply-To: <20131112192624.GV18189@um.es> Date: Tue, 12 Nov 2013 21:06:54 +0100 Content-Transfer-Encoding: quoted-printable Message-Id: References: <242ec170d2f04b40b635cab3a547faa2@exrad6.ad.rad.co.il> <20131112192624.GV18189@um.es> To: Pedro Martinez-Julia X-Mailer: Apple Mail (2.1085) Cc: sdn@irtf.org Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 12 Nov 2013 20:07:10 -0000 Hi Pedro, My "concern" with such approach is that it adds an additional level of = indirection. You still have to provide a definition for "control plane = operational decisions" and "management plane administrative decisions". In addition, it leads to function overlapping among planes. In this = example, providing the next hop for a destination network might be a = control plane or management plane operation... Not sure if this makes = things clearer. IMO whatever the definitions we adopt, they should draw a clear line = between each pair of planes. In this way we''ll have clear interfaces. I'm not so much concerned about function F belonging to either plane X = or Y. Whatever criteria we employ that clearly determines if F is in X = or not, should suffice. Obviously, we must try to come up with = definitions that most people feel comfortable with (ideally they'd = capture common wisdom if possible). But again, as long as they are = unambiguous, we can start building upon them. Best, fran El 12/11/2013, a las 20:26, Pedro Martinez-Julia escribi=F3: > On Tue, Nov 12, 2013 at 07:45:14PM +0100, Francisco Javier Ros Mu=F1oz = wrote: >> Just as an exercise... >>=20 >> According to my proposed definition, adding a static route is a = control plane operation because it decides the fate of some packets. >> On the contrary, configuring an IP address is a management operation = (since it configures a resource) that triggers a control plane operation = (adding a routing entry that decides the fate of some packets). >>=20 >> Yep, I know that some of you won't like this ;-) >>=20 >=20 > According to functionality, and my point of view, "adding a static > route" belongs to the control plane if triggered by an operational > decision (the router does not know how to reach network XX) but it > belongs to the management plane if triggered by an administrative > decision (we want to use this link instead of the one determined by > OSPF). >=20 > As I said before, the same protocol/operation may be classified into > different planes according to the function it does. >=20 >> Best, >> fran >>=20 >=20 > Regards, > Pedro >=20 > --=20 > Pedro Martinez-Julia > Department of Communication and Information Engineering > Faculty of Computer Science > University of Murcia > Email: pedromj@um.es > --------------------------------------------------------- > *** Entia non sunt multiplicanda praeter necessitatem *** > _______________________________________________ > sdn mailing list > sdn@irtf.org > https://www.irtf.org/mailman/listinfo/sdn -- Francisco J. Ros, PhD Dept. of Information and Communications Engineering University of Murcia, Murcia (Spain) http://masimum.inf.um.es/fjrm/ From ramk@Brocade.com Tue Nov 12 14:46:26 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id EF8E821E8102 for ; Tue, 12 Nov 2013 14:46:25 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -3.265 X-Spam-Level: X-Spam-Status: No, score=-3.265 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, IP_NOT_FRIENDLY=0.334, RCVD_IN_DNSWL_LOW=-1] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Vb3JB8LEc0f1 for ; Tue, 12 Nov 2013 14:46:21 -0800 (PST) Received: from mx0b-000f0801.pphosted.com (mx0b-000f0801.pphosted.com [67.231.152.113]) by ietfa.amsl.com (Postfix) with ESMTP id 0AC5021F9FA2 for ; Tue, 12 Nov 2013 14:46:20 -0800 (PST) Received: from pps.filterd (m0000700 [127.0.0.1]) by mx0b-000f0801.pphosted.com (8.14.5/8.14.5) with SMTP id rACLlMx4023421; Tue, 12 Nov 2013 14:46:17 -0800 Received: from hq1wp-exchub01.corp.brocade.com ([144.49.131.13]) by mx0b-000f0801.pphosted.com with ESMTP id 1g3ew90m91-1 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=NOT); Tue, 12 Nov 2013 14:46:16 -0800 Received: from HQ1WP-EXHUB01.corp.brocade.com (10.70.36.14) by HQ1WP-EXCHUB01.corp.brocade.com (10.70.36.99) with Microsoft SMTP Server (TLS) id 14.3.123.3; Tue, 12 Nov 2013 14:46:12 -0800 Received: from HQ1-EXCH01.corp.brocade.com ([fe80::ed42:173e:fe7d:d0a6]) by HQ1WP-EXHUB01.corp.brocade.com ([::1]) with mapi; Tue, 12 Nov 2013 14:46:05 -0800 From: ramki Krishnan To: Jamal Hadi Salim , Yaakov Stein Date: Tue, 12 Nov 2013 14:46:02 -0800 Thread-Topic: [Sdn] Timeliness WAS(Re: Thoughts on Defining control and Management Planes Thread-Index: Ac7f4TAa90DismOrTDO+52xUrhWeJgAFzWTQ Message-ID: References: <00dc01cedee6$327f9730$977ec590$@riw.us> <012501cedeea$7f46c120$7dd44360$@riw.us> <2329b8e07d8444a2808de812c4ea0e2a@exrad6.ad.rad.co.il> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:5.10.8794, 1.0.431, 0.0.0000 definitions=2013-11-12_08:2013-11-12, 2013-11-12, 1970-01-01 signatures=0 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 suspectscore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=7.0.1-1305240000 definitions=main-1311120188 Cc: Russ White , David Meyer , "sdn@irtf.org" Subject: Re: [Sdn] Timeliness WAS(Re: Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 12 Nov 2013 22:46:26 -0000 Hi Jamal, I agree, "acceleration" is definitely important for certain use cases. Ther= e is some work going on in Netconf in the area of binary encoding (see draf= t below) to achieve the "acceleration" you mentioned. https://datatracker.ietf.org/doc/draft-varga-netconf-exi-capability/ Thanks, Ramki -----Original Message----- From: sdn-bounces@irtf.org [mailto:sdn-bounces@irtf.org] On Behalf Of Jamal= Hadi Salim Sent: Tuesday, November 12, 2013 11:55 AM To: Yaakov Stein Cc: Russ White; David Meyer; sdn@irtf.org Subject: Re: [Sdn] Timeliness WAS(Re: Thoughts on Defining control and Mana= gement Planes Yaakov, Thanks for the insight. So question: for lack of better wording, is the "accelaration" (or maybe it= is "velocity") towards consistency unimportant? IOW, If i can update a 500K FIB table 100x faster with ForCES than with Net= conf, does that not make them different? cheers, jamal PS:- I am not here to judge merits of the two, i think they have their plac= e. If updating the tables was unimportant and usability is more important i wo= uld likely pick netconf. This is what we set out to do and i dont think the mes= sage is getting across. On Tue, Nov 12, 2013 at 1:20 PM, Yaakov Stein wrote: > No, consistency and availability are quite different > > Consistency means that if you sent two packet in rapid succession, > they would be handled in the same (and hopefully correct) way. > > Availability means that the packet is immediately handled, even if incorr= ectly. > > So, if in OF you start a new flow, the packet is not matched and so is se= nt to the controller. > The flow now hangs until the controller receives the packet, figures out = what to do with the flow, and configures all the match tables of all the sw= itches. > This is a lack of availability. > From now on the packets belonging to the flow are all handled consistentl= y. > > What happens if a link breaks ? > In a well-engineered network protection switching immediately compensates= , > thus guaranteeing availability, even if the packets are now handled diffe= rently (lack of consistency). > In a best-effort OSPF network, a link-down will cause the router before t= he break > to immediately Dijkstra the next packet along a new path - also availabil= ity at the expense of consistency. The new path may even lead to black-holi= ng - really inconsistent behavior. > > What happens if we need to send a packet belonging to a new flow to the c= ontroller > and the controller (or a link to it) fails ? > Then either we can wait until the controller CAN respond (unavailable) > or decide to forward according to conventional (pre-SDN) methods (inconsi= stent). > > Y(J)S > > > -----Original Message----- > From: Jamal Hadi Salim [mailto:hadi@mojatatu.com] > Sent: 12 November, 2013 13:31 > To: Yaakov Stein > Cc: Russ White; David Meyer; sdn@irtf.org > Subject: Re: [Sdn] Timeliness WAS(Re: Thoughts on Defining control and Ma= nagement Planes > > On Mon, Nov 11, 2013 at 12:48 PM, Yaakov Stein wrote: >> No, we needn't put absolute times. >> > > Ok, agreed. > I was hoping there would be a good paper to what Dave Meyer pointed out > here: > http://cmg.soton.ac.uk/research/projects/separation-of-timescales-in-mode= ls-of-complex-networks/ > >> The times of importance are those that would signify unavailability for = the particular application. >> >> Thus for interactive applications the times would be shorter than for pr= ogressive download ones. >> >> In the old days when voice was the only application, 100 ms was the >> gold standard, and so protection switching was required to be mo more th= an 50 ms. > > I think what you say above may help me make the point. > Can we equate "consistency" to what you refer to as "unavailability"? > i.e. if i was able to update a FIB table at 10K/s then i would be able to= reach consistency faster than if i did it at 1K/s Given that design intent= of "management" interfaces was mostly targeted for human interaction both = from usability as well as response tolerances - does automation change the= fact that they are still constrained to that original design intent? I thi= nk not. > Just because i can automate a CLI with expect does not magically change t= hat it is slow (my tie to sense of urgency that offended Russ ;->). > I can update tables a magnitude faster with OF than with netconf. Both ar= e called SDN technologies. > > cheers, > jamal _______________________________________________ sdn mailing list sdn@irtf.org https://www.irtf.org/mailman/listinfo/sdn From hadi@mojatatu.com Tue Nov 12 15:33:55 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id BBFE611E8166 for ; Tue, 12 Nov 2013 15:33:55 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.962 X-Spam-Level: X-Spam-Status: No, score=-102.962 tagged_above=-999 required=5 tests=[AWL=0.015, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, RCVD_IN_DNSWL_LOW=-1, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 8AU9NXCzROcH for ; Tue, 12 Nov 2013 15:33:51 -0800 (PST) Received: from mail-vb0-f43.google.com (mail-vb0-f43.google.com [209.85.212.43]) by ietfa.amsl.com (Postfix) with ESMTP id 5B5FA11E8163 for ; Tue, 12 Nov 2013 15:33:39 -0800 (PST) Received: by mail-vb0-f43.google.com with SMTP id w20so2979142vbb.16 for ; Tue, 12 Nov 2013 15:33:38 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc:content-type:content-transfer-encoding; bh=OSn/onZzUrPYvlRIWTux06iClLunM3f5OW1PG+0DH6Y=; b=e+xVl/xdVodZuzPbaZlKxpWrLf5zxDuQUcFiPOg01KwlHreZAGDYdzp4RxQuUQQceP lwV7BP0s2+AwhzSHgNpROdnShmupwgbtCk9p9NQae6/L5pnGwVmpEq67LG/LehCRu2SQ DK9stqmCuSWtJ5h+xxZUn2eN+br8ueInR3AM024pP1BFVWvs504bBKtvDMpn9Tow/1LP 26lzE/dCVOsAZiLV3BH34OwiEIskzbkTGYYOuHYMyYh8Rc7by3dzS9besEmByKbB1WPX F2fzrScqBD9oQMXjRU1EjjtmQVmfnn9EdmOxBwEVnkJJrNJFYmhzCBiN7iT5qSTyO9WB 1l/Q== X-Gm-Message-State: ALoCoQmPt9bJmiIMh0QziSlCQaZOBKjy+oh8PB/iVWT+WywALlxCdbdFuuLwcHrDaLVNZ25O9GDm X-Received: by 10.52.243.138 with SMTP id wy10mr26926052vdc.2.1384299218602; Tue, 12 Nov 2013 15:33:38 -0800 (PST) MIME-Version: 1.0 Received: by 10.58.8.19 with HTTP; Tue, 12 Nov 2013 15:33:18 -0800 (PST) In-Reply-To: References: <00dc01cedee6$327f9730$977ec590$@riw.us> <012501cedeea$7f46c120$7dd44360$@riw.us> <2329b8e07d8444a2808de812c4ea0e2a@exrad6.ad.rad.co.il> From: Jamal Hadi Salim Date: Tue, 12 Nov 2013 18:33:18 -0500 Message-ID: To: ramki Krishnan Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Cc: Russ White , David Meyer , Yaakov Stein , "sdn@irtf.org" Subject: Re: [Sdn] Timeliness WAS(Re: Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 12 Nov 2013 23:33:55 -0000 Hi Ramki, Thanks for the pointer. The author well identifies the issues i was pointin= g to with classical netconf (abuse of the three resources). The fact they mentio= n human readability is sacrificed even drives the point home more. I think the proposal will improve bandwidth utilization without a doubt. If i did not misunderstand - it will improve cpu utilization but not totall= y as a protocol that is designed from ground up to be binary. This is because it seems to me it requires compression/decompression on both sides (none which are free). But perhaps that is cheaper than string processing. I am also not sure it is clever to have a protocol that now does both ascii= and binary - but that is a tangent discussion issue. cheers, jamal On Tue, Nov 12, 2013 at 5:46 PM, ramki Krishnan wrote: > Hi Jamal, > > I agree, "acceleration" is definitely important for certain use cases. Th= ere is some work going on in Netconf in the area of binary encoding (see dr= aft below) to achieve the "acceleration" you mentioned. > > https://datatracker.ietf.org/doc/draft-varga-netconf-exi-capability/ > > Thanks, > Ramki > > -----Original Message----- > From: sdn-bounces@irtf.org [mailto:sdn-bounces@irtf.org] On Behalf Of Jam= al Hadi Salim > Sent: Tuesday, November 12, 2013 11:55 AM > To: Yaakov Stein > Cc: Russ White; David Meyer; sdn@irtf.org > Subject: Re: [Sdn] Timeliness WAS(Re: Thoughts on Defining control and Ma= nagement Planes > > Yaakov, > Thanks for the insight. > > So question: for lack of better wording, is the "accelaration" (or maybe = it is > "velocity") towards consistency unimportant? > IOW, If i can update a 500K FIB table 100x faster with ForCES than with N= etconf, > does that not make them different? > > cheers, > jamal > > PS:- I am not here to judge merits of the two, i think they have their pl= ace. > If updating the tables was unimportant and usability is more important i = would > likely pick netconf. This is what we set out to do and i dont think the m= essage > is getting across. > > > > On Tue, Nov 12, 2013 at 1:20 PM, Yaakov Stein wrote: >> No, consistency and availability are quite different >> >> Consistency means that if you sent two packet in rapid succession, >> they would be handled in the same (and hopefully correct) way. >> >> Availability means that the packet is immediately handled, even if incor= rectly. >> >> So, if in OF you start a new flow, the packet is not matched and so is s= ent to the controller. >> The flow now hangs until the controller receives the packet, figures out= what to do with the flow, and configures all the match tables of all the s= witches. >> This is a lack of availability. >> From now on the packets belonging to the flow are all handled consistent= ly. >> >> What happens if a link breaks ? >> In a well-engineered network protection switching immediately compensate= s, >> thus guaranteeing availability, even if the packets are now handled diff= erently (lack of consistency). >> In a best-effort OSPF network, a link-down will cause the router before = the break >> to immediately Dijkstra the next packet along a new path - also availabi= lity at the expense of consistency. The new path may even lead to black-hol= ing - really inconsistent behavior. >> >> What happens if we need to send a packet belonging to a new flow to the = controller >> and the controller (or a link to it) fails ? >> Then either we can wait until the controller CAN respond (unavailable) >> or decide to forward according to conventional (pre-SDN) methods (incons= istent). >> >> Y(J)S >> >> >> -----Original Message----- >> From: Jamal Hadi Salim [mailto:hadi@mojatatu.com] >> Sent: 12 November, 2013 13:31 >> To: Yaakov Stein >> Cc: Russ White; David Meyer; sdn@irtf.org >> Subject: Re: [Sdn] Timeliness WAS(Re: Thoughts on Defining control and M= anagement Planes >> >> On Mon, Nov 11, 2013 at 12:48 PM, Yaakov Stein wrote: >>> No, we needn't put absolute times. >>> >> >> Ok, agreed. >> I was hoping there would be a good paper to what Dave Meyer pointed out >> here: >> http://cmg.soton.ac.uk/research/projects/separation-of-timescales-in-mod= els-of-complex-networks/ >> >>> The times of importance are those that would signify unavailability for= the particular application. >>> >>> Thus for interactive applications the times would be shorter than for p= rogressive download ones. >>> >>> In the old days when voice was the only application, 100 ms was the >>> gold standard, and so protection switching was required to be mo more t= han 50 ms. >> >> I think what you say above may help me make the point. >> Can we equate "consistency" to what you refer to as "unavailability"? >> i.e. if i was able to update a FIB table at 10K/s then i would be able t= o reach consistency faster than if i did it at 1K/s Given that design inten= t of "management" interfaces was mostly targeted for human interaction both= from usability as well as response tolerances - does automation change th= e fact that they are still constrained to that original design intent? I th= ink not. >> Just because i can automate a CLI with expect does not magically change = that it is slow (my tie to sense of urgency that offended Russ ;->). >> I can update tables a magnitude faster with OF than with netconf. Both a= re called SDN technologies. >> >> cheers, >> jamal > _______________________________________________ > sdn mailing list > sdn@irtf.org > https://www.irtf.org/mailman/listinfo/sdn From yaakov_s@rad.com Tue Nov 12 23:02:51 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 68B4211E80E2 for ; Tue, 12 Nov 2013 23:02:51 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.287 X-Spam-Level: X-Spam-Status: No, score=-102.287 tagged_above=-999 required=5 tests=[AWL=0.000, BAYES_00=-2.599, HOST_MISMATCH_COM=0.311, UNPARSEABLE_RELAY=0.001, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id EvKDDqg0trPK for ; Tue, 12 Nov 2013 23:02:46 -0800 (PST) Received: from rad.co.il (mailrelay01-ib1.rad.com [94.188.133.165]) by ietfa.amsl.com (Postfix) with ESMTP id 029AC11E80D9 for ; Tue, 12 Nov 2013 23:02:45 -0800 (PST) Received: from Internal Mail-Server by MailRelay01 (envelope-from yaakov?s@rad.com) with RC4-SHA encrypted SMTP; 13 Nov 2013 09:02:41 +0200 Received: from EXRAD6.ad.rad.co.il (2002:c072:18be::c072:18be) by exrad6.ad.rad.co.il (2002:c072:18be::c072:18be) with Microsoft SMTP Server (TLS) id 15.0.712.24; Wed, 13 Nov 2013 09:02:40 +0200 Received: from EXRAD6.ad.rad.co.il ([fe80::95ed:2d3a:ffd9:390a]) by exrad6.ad.rad.co.il ([fe80::95ed:2d3a:ffd9:390a%20]) with mapi id 15.00.0712.012; Wed, 13 Nov 2013 09:02:40 +0200 From: Yaakov Stein To: Jamal Hadi Salim Thread-Topic: [Sdn] Timeliness WAS(Re: Thoughts on Defining control and Management Planes Thread-Index: AQHO35q+lgcM1MEOwUabIdZejEy86Zoh5j4g///7LICAANnYAA== Date: Wed, 13 Nov 2013 07:02:39 +0000 Message-ID: <4680c2f6eabd4b3a9350cf7e5cdff6f8@exrad6.ad.rad.co.il> References: <00dc01cedee6$327f9730$977ec590$@riw.us> <012501cedeea$7f46c120$7dd44360$@riw.us> <2329b8e07d8444a2808de812c4ea0e2a@exrad6.ad.rad.co.il> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [192.115.243.62] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Commtouch-Refid: str=0001.0A090205.52832411.0136, ss=1, re=0.100, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0 (Unknown) Cc: Russ White , David Meyer , "sdn@irtf.org" Subject: Re: [Sdn] Timeliness WAS(Re: Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 13 Nov 2013 07:02:51 -0000 No, a management plane operation doesn't become a control plane one just be= cause it is faster. In general, control plane operations are faster because they are local rath= er than having to suffer a round-trip time, or because they are automatic r= ather than having a human in the loop.=20 But there are exceptions. Configuring using a terminal directly plugged int= o a box is management plane, although it is very local. Control processes are automatic, triggered by events and timers, and the logic behind them straightforward. Management operations are initiated, and are directly motivated by high-lev= el (business/mission related) concerns. Y(J)S -----Original Message----- From: Jamal Hadi Salim [mailto:hadi@mojatatu.com]=20 Sent: 12 November, 2013 21:55 To: Yaakov Stein Cc: Russ White; David Meyer; sdn@irtf.org Subject: Re: [Sdn] Timeliness WAS(Re: Thoughts on Defining control and Mana= gement Planes Yaakov, Thanks for the insight. So question: for lack of better wording, is the "accelaration" (or maybe it= is "velocity") towards consistency unimportant? IOW, If i can update a 500K FIB table 100x faster with ForCES than with Net= conf, does that not make them different? cheers, jamal PS:- I am not here to judge merits of the two, i think they have their plac= e. If updating the tables was unimportant and usability is more important i wo= uld likely pick netconf. This is what we set out to do and i dont think the= message is getting across. On Tue, Nov 12, 2013 at 1:20 PM, Yaakov Stein wrote: > No, consistency and availability are quite different > > Consistency means that if you sent two packet in rapid succession,=20 > they would be handled in the same (and hopefully correct) way. > > Availability means that the packet is immediately handled, even if incorr= ectly. > > So, if in OF you start a new flow, the packet is not matched and so is se= nt to the controller. > The flow now hangs until the controller receives the packet, figures out = what to do with the flow, and configures all the match tables of all the sw= itches. > This is a lack of availability. > From now on the packets belonging to the flow are all handled consistentl= y. > > What happens if a link breaks ? > In a well-engineered network protection switching immediately=20 > compensates, thus guaranteeing availability, even if the packets are now = handled differently (lack of consistency). > In a best-effort OSPF network, a link-down will cause the router=20 > before the break to immediately Dijkstra the next packet along a new path= - also availability at the expense of consistency. The new path may even l= ead to black-holing - really inconsistent behavior. > > What happens if we need to send a packet belonging to a new flow to=20 > the controller and the controller (or a link to it) fails ? > Then either we can wait until the controller CAN respond (unavailable)=20 > or decide to forward according to conventional (pre-SDN) methods (inconsi= stent). > > Y(J)S > > > -----Original Message----- > From: Jamal Hadi Salim [mailto:hadi@mojatatu.com] > Sent: 12 November, 2013 13:31 > To: Yaakov Stein > Cc: Russ White; David Meyer; sdn@irtf.org > Subject: Re: [Sdn] Timeliness WAS(Re: Thoughts on Defining control and=20 > Management Planes > > On Mon, Nov 11, 2013 at 12:48 PM, Yaakov Stein wrote: >> No, we needn't put absolute times. >> > > Ok, agreed. > I was hoping there would be a good paper to what Dave Meyer pointed=20 > out > here: > http://cmg.soton.ac.uk/research/projects/separation-of-timescales-in-m > odels-of-complex-networks/ > >> The times of importance are those that would signify unavailability for = the particular application. >> >> Thus for interactive applications the times would be shorter than for pr= ogressive download ones. >> >> In the old days when voice was the only application, 100 ms was the=20 >> gold standard, and so protection switching was required to be mo more th= an 50 ms. > > I think what you say above may help me make the point. > Can we equate "consistency" to what you refer to as "unavailability"? > i.e. if i was able to update a FIB table at 10K/s then i would be able to= reach consistency faster than if i did it at 1K/s Given that design intent= of "management" interfaces was mostly targeted for human interaction both = from usability as well as response tolerances - does automation change the= fact that they are still constrained to that original design intent? I thi= nk not. > Just because i can automate a CLI with expect does not magically change t= hat it is slow (my tie to sense of urgency that offended Russ ;->). > I can update tables a magnitude faster with OF than with netconf. Both ar= e called SDN technologies. > > cheers, > jamal From fvramos@fc.ul.pt Wed Nov 13 02:49:05 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 611FC21F9D7B for ; Wed, 13 Nov 2013 02:49:05 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 1ae5kPdX9yqE for ; Wed, 13 Nov 2013 02:48:57 -0800 (PST) Received: from mx02.fc.ul.pt (mx02.fc.ul.pt [194.117.42.36]) by ietfa.amsl.com (Postfix) with ESMTP id BA6BC21E8056 for ; Wed, 13 Nov 2013 02:48:54 -0800 (PST) Received: from FC-MAILHUB01.fc.ul.pt (fc-mailhub01.fc.ul.pt [10.101.246.23]) by mx02.fc.ul.pt (8.13.8/8.13.8) with ESMTP id rADAmaoN016987; Wed, 13 Nov 2013 10:48:36 GMT Received: from smtp.fc.ul.pt (194.117.42.58) by FC-MAILHUB01.fc.ul.pt (10.101.246.21) with Microsoft SMTP Server id 8.3.327.1; Wed, 13 Nov 2013 10:48:35 +0000 Received: from difvramos (nat01.di.fc.ul.pt [194.117.22.71]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) by smtp.fc.ul.pt (Postfix) with ESMTPSA id DBDECA047; Wed, 13 Nov 2013 10:48:35 +0000 (WET) From: Fernando Ramos To: "'Yaakov Stein'" , "'Jamal Hadi Salim'" References: <00dc01cedee6$327f9730$977ec590$@riw.us> <012501cedeea$7f46c120$7dd44360$@riw.us> <2329b8e07d8444a2808de812c4ea0e2a@exrad6.ad.rad.co.il> In-Reply-To: Date: Wed, 13 Nov 2013 10:49:04 +0000 Message-ID: <001801cee05d$f8698b90$e93ca2b0$@ul.pt> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Office Outlook 12.0 Thread-Index: AQHO35q+lgcM1MEOwUabIdZejEy86Zoh5j4ggAEUQWA= Content-Language: pt X-FCUL-MailScanner-Information: Please contact the CI/FCUL for more information X-FCUL-MailScanner-ID: rADAmaoN016987 X-FCUL-MailScanner: Found to be clean X-FCUL-MailScanner-From: fvramos@fc.ul.pt Cc: 'Russ White' , 'David Meyer' , fvramos@fc.ul.pt, sdn@irtf.org Subject: Re: [Sdn] Timeliness WAS(Re: Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 13 Nov 2013 10:49:05 -0000 Excellent explanation on the C. vs A. problem for networks. Thanks Yaakov. One or two notes below. >No, consistency and availability are quite different > >Consistency means that if you sent two packet in rapid succession, they >would be handled in the same (and hopefully correct) way. > >Availability means that the packet is immediately handled, even if >incorrectly. > >So, if in OF you start a new flow, the packet is not matched and so is >sent to the controller. >The flow now hangs until the controller receives the packet, figures out >what to do with the flow, and configures all the match tables of all the >switches. >This is a lack of availability. >From now on the packets belonging to the flow are all handled >consistently. True. In practice things are not that easy, so you may need in fact something like this: http://www.cs.princeton.edu/~jrex/papers/sigcomm12.pdf (and other recent related work in HotSDN and EWSDN etc.) to have some consistency guarantees. >What happens if a link breaks ? >In a well-engineered network protection switching immediately >compensates, thus guaranteeing availability, even if the packets are now >handled differently (lack of consistency). >In a best-effort OSPF network, a link-down will cause the router before >the break to immediately Dijkstra the next packet along a new path - >also availability at the expense of consistency. The new path may even >lead to black-holing - really inconsistent behavior. > I also loved the bit "immediately Dijkstra the next packet". :-) Crystal clear explanation. Thanks Yaakov. Cheers, Fernando From hadi@mojatatu.com Wed Nov 13 05:51:07 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id F3EA521E80E9 for ; Wed, 13 Nov 2013 05:51:06 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.963 X-Spam-Level: X-Spam-Status: No, score=-102.963 tagged_above=-999 required=5 tests=[AWL=0.014, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, RCVD_IN_DNSWL_LOW=-1, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Kx3hTua75bo8 for ; Wed, 13 Nov 2013 05:51:01 -0800 (PST) Received: from mail-vb0-f48.google.com (mail-vb0-f48.google.com [209.85.212.48]) by ietfa.amsl.com (Postfix) with ESMTP id C223821E8082 for ; Wed, 13 Nov 2013 05:51:01 -0800 (PST) Received: by mail-vb0-f48.google.com with SMTP id m10so287670vbh.7 for ; Wed, 13 Nov 2013 05:51:01 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc:content-type; bh=BPnpdGp/YB5Yuobag93SUxwU/LidVFiRYN/C/z76vwU=; b=I8T7JO6sKk9vV2s4o2UvlUPRZDdWtxWpDYLmozLIBbPqYDh1pXARwfTQb1EPFZ8i6A U8EqxEO8uL8fzFsRrRVfNndy63dA2ZnnOljelsONbZxZoOtV/g4Ker4JdrNwBYEEki2/ PMbPBb4dmKUz/6kpwSqCZxC8IEL9DPpOQFM89a7nc9TIbJTjINJ5985N/ycjohpiYyBs tIFMw7DVtTfT0aMBNY+SeXJ0to0bMZ5HWeo80LVyM/z1dNYXJo0a9DA+tYG5yMN8fyQY rZPY+rrJKrQZrLStbuhaF5quEB1njDEAVsx901dqqK+HBxAiTLWnU49v9+jeUnMM1CAy C47g== X-Gm-Message-State: ALoCoQlMIBaNTTGXJKyhNsHLVyRA1B+sgEwtL5yab/TlR5+5AaAcvFvkWEDncj73KJYiJHPQCHcf X-Received: by 10.221.64.17 with SMTP id xg17mr34303294vcb.5.1384350661077; Wed, 13 Nov 2013 05:51:01 -0800 (PST) MIME-Version: 1.0 Received: by 10.58.8.19 with HTTP; Wed, 13 Nov 2013 05:50:41 -0800 (PST) In-Reply-To: <4680c2f6eabd4b3a9350cf7e5cdff6f8@exrad6.ad.rad.co.il> References: <00dc01cedee6$327f9730$977ec590$@riw.us> <012501cedeea$7f46c120$7dd44360$@riw.us> <2329b8e07d8444a2808de812c4ea0e2a@exrad6.ad.rad.co.il> <4680c2f6eabd4b3a9350cf7e5cdff6f8@exrad6.ad.rad.co.il> From: Jamal Hadi Salim Date: Wed, 13 Nov 2013 08:50:41 -0500 Message-ID: To: Yaakov Stein Content-Type: text/plain; charset=ISO-8859-1 Cc: Russ White , David Meyer , "sdn@irtf.org" Subject: Re: [Sdn] Timeliness WAS(Re: Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 13 Nov 2013 13:51:07 -0000 On Wed, Nov 13, 2013 at 2:02 AM, Yaakov Stein wrote: > No, a management plane operation doesn't become a control plane > one just because it is faster. > Indeed. I think the timeliness factor is already being proven of importance by desire to make netconf move faster. Netconf is a protocol that was designed to be management. And it is now used in some cases to do control operations - it is natural to think its timeliness needs to improve (as that draft tries to). > In general, control plane operations are faster because they are local >rather than having to suffer a round-trip time, or because they are >automatic rather than having a human in the loop. > Is going a cross a small number of hops local (CE<-->FE)? > But there are exceptions. Configuring using a terminal directly plugged into >a box is management plane, although it is very local. > Agreed. > Control processes are automatic, triggered by events and timers, > and the logic behind them straightforward. > Management operations are initiated, and are directly motivated by > high-level (business/mission related) concerns. > Dont agree 100% but it is the closest thing I have heard to what we have been trying to say. cheers, jamal From scott.brim@gmail.com Wed Nov 13 06:33:56 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B071611E8180 for ; Wed, 13 Nov 2013 06:33:56 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.556 X-Spam-Level: X-Spam-Status: No, score=-102.556 tagged_above=-999 required=5 tests=[AWL=0.043, BAYES_00=-2.599, HTML_MESSAGE=0.001, NO_RELAYS=-0.001, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id EtGYoXlpogNw for ; Wed, 13 Nov 2013 06:33:56 -0800 (PST) Received: from mail-ob0-x233.google.com (mail-ob0-x233.google.com [IPv6:2607:f8b0:4003:c01::233]) by ietfa.amsl.com (Postfix) with ESMTP id 59EBC11E815F for ; Wed, 13 Nov 2013 06:33:55 -0800 (PST) Received: by mail-ob0-f179.google.com with SMTP id wn1so505921obc.38 for ; Wed, 13 Nov 2013 06:33:55 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc:content-type; bh=YTk2KjXXDPLbTlPAtpkB6JTfFnEfHlU1BcIrIzg1uGw=; b=gacsgJs8BrwW/qe3pP0sYK3Pi3E62yxzgaE+f+mb+KzA6c/ky4CHHyR78ktDhJ5eNj cPYq2uRGHcy+yvwKdV75ASJZeVreydhyw5L/IsWY9HyHm2+DlKNGgcXgNQjXti812hnF 4apNctBWEzkc47q2B5Gib7nDFe/JY0l+oVBJhJp+Z15+GNtt2dEkGlirrAUonO/nBlWd 1OV0schJlGw1xMYGv+qI7THrf4+w6x0ZTdIRXXucVoxLSWKdnQzoO3kivAy/zoAwO1d2 qj8MSX2BXeyh5MpInQePB9E+rHXLWdDwRrOIs9RFyrP9/rwhMJhFJ71fbn6ox5cVAR9Q lpig== X-Received: by 10.182.246.7 with SMTP id xs7mr2098406obc.81.1384353234791; Wed, 13 Nov 2013 06:33:54 -0800 (PST) MIME-Version: 1.0 Received: by 10.182.2.134 with HTTP; Wed, 13 Nov 2013 06:33:34 -0800 (PST) In-Reply-To: <016301cedfab$7620b620$62622260$@riw.us> References: <66422454-39A4-40F0-BFF6-986BFC4CAF9A@riw.us> <016301cedfab$7620b620$62622260$@riw.us> From: Scott Brim Date: Wed, 13 Nov 2013 09:33:34 -0500 Message-ID: To: Russ White Content-Type: multipart/alternative; boundary=001a11c2fa06cdb9d004eb0fdab8 Cc: SDN IRTF list Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 13 Nov 2013 14:33:56 -0000 --001a11c2fa06cdb9d004eb0fdab8 Content-Type: text/plain; charset=ISO-8859-1 On Tue, Nov 12, 2013 at 8:31 AM, Russ White wrote: > > > > For me the difference is between something that is supposed to be > > in continuous operation, and something that is supposed to set up that > > continuous operation. I see the former as control plane and forwarding > > plane, and the latter as management. When you perform a management > > function, then you can sit back and watch to make sure you did it right. > A > > control function, on the other hand, continues _as part of_ things going > right. > > > > I think this merges the control and data planes, though -- and I > think > > we want to be able to differentiate between them. > > > > Russ, maybe it merges your concepts of planes, but I'm trying to get you > to > > use different concepts. In what I said, control and management are > clearly > > separated. We can get to specifics if you like, as tests of conceptual > models. > > Just keep in mind that components function in multiple planes > > simultaneously. > > Given your definition --these things are all in continuous operation, That's not what I meant to say, and sorry for using those words. Trying again: management sets up and monitors the network machinery, while control operates it. I'll give up on getting succinct sound bytes soon. > so > they must all be control plane: You know that's impossible. > - Forwarding of packets > Forwarding. (One nit is that forwarding of control or management plane packets has generally not been considered "forwarding plane" -- it's special in the abstract, even though in IP networks transport of control/mgmt is actually done using the same IP forwarding mechanisms.) > - Detection of down links > Categorizing that, and others below, depends on the function that receives the result. What does it do? If it changes configuration, it's management. If it changes behavior for now but does not change configuration, it's control. > - Flooding and maintenance of topology information > Control > - Monitoring of cpu thermals - Monitoring of memory utilization > Again, it depends on how the information will be responded to. The information isn't the point, it's whether it's used for management or control. > - Logging > Management. > - Reactive configuration to black hole attacks > Good one. I would call this a rapid response of management. The last time I tried to define planes was in Y.2011. Here, I originally thought the goal was to have consistency with other definitions of "planes", but it looks like these definitions are just going to be used in SDNRG (they already disagree with at least one other SDN group). If all this is local scope, whatever you all decide on is fine. I look forward to a draft. Scott --001a11c2fa06cdb9d004eb0fdab8 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
On T= ue, Nov 12, 2013 at 8:31 AM, Russ White <russw@riw.us> wrote:
=

> =A0 =A0 =A0 > For me the difference is between something that is su= pposed to be
> in continuous operation, and something that is supposed to set up that=
> continuous operation. =A0I see the former as control plane and forward= ing
> plane, and the latter as management. =A0When you perform a management<= br> > function, then you can sit back and watch to make sure you did it righ= t.
A
> control function, on the other hand, continues _as part of_ things goi= ng
right.
>
> =A0 =A0 =A0 I think this merges the control and data planes, though --= and I
think
> we want to be able to differentiate between them.
>
> Russ, maybe it merges your concepts of planes, but I'm trying to g= et you
to
> use different concepts. In what I said, control and management are cle= arly
> separated. We can get to specifics if you like, as tests of conceptual=
models.
> Just keep in mind that components function in multiple planes
> simultaneously.

Given your definition --these things are all in continuous operation,

That's not what I meant to say, and sorry f= or using those words. Trying again: management sets up and monitors the net= work machinery, while control operates it. I'll give up on getting succ= inct sound bytes soon.
=A0
so
they must all be control plane:

You know that's impossible.
=A0
- Forwarding of packets

Forwarding.=A0<= /div>

(One nit is that forwarding of control or manageme= nt plane packets has generally not been considered "forwarding plane&q= uot; -- it's special in the abstract, even though in IP networks transp= ort of control/mgmt is actually done using the same IP forwarding mechanism= s.)
=A0
- Detection of down links

Categorizing = that, and others below, depends on the function that receives the result. W= hat does it do? If it changes configuration, it's management. If it cha= nges behavior for now but does not change configuration, it's control.<= /div>
=A0
- Flooding and maintenance of topology information
Control
=A0
- Monitoring of cpu thermals=A0
- Monitoring of memory utilization

Agai= n, it depends on how the information will be responded to. =A0The informati= on isn't the point, it's whether it's used for management or co= ntrol.
=A0
- Logging

Management.
=A0
- Reactive configuration to black hole attacks

Good one. I would call this a rapid response of management.

The last time I tried to define planes was in Y.2011. =A0= Here, I originally thought the goal was to have consistency with other defi= nitions of "planes", but it looks like these definitions are just= going to be used in SDNRG (they already disagree with at least one other S= DN group). If all this is local scope, whatever you all decide on is fine. = I look forward to a draft.

Scott
--001a11c2fa06cdb9d004eb0fdab8-- From russw@riw.us Wed Nov 13 08:01:58 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E12F421E8116 for ; Wed, 13 Nov 2013 08:01:58 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.598 X-Spam-Level: X-Spam-Status: No, score=-2.598 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id suadfh+0fSXD for ; Wed, 13 Nov 2013 08:01:53 -0800 (PST) Received: from server.riw.us (server.riw.us [162.144.32.236]) by ietfa.amsl.com (Postfix) with ESMTP id 0306321E8063 for ; Wed, 13 Nov 2013 08:01:52 -0800 (PST) Received: from mobile-166-147-070-132.mycingular.net ([166.147.70.132]:33707 helo=[10.143.231.33]) by server.riw.us with esmtpa (Exim 4.80.1) (envelope-from ) id 1Vgct0-0001ZK-45; Wed, 13 Nov 2013 16:01:46 +0000 MIME-Version: 1.0 To: Jamal Hadi Salim , Yaakov Stein From: Russ White Date: Wed, 13 Nov 2013 10:01:02 -0600 Content-Type: multipart/alternative; boundary="_B6CB3B0D-2CCD-41DB-89B9-407F8E8080A5_" X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server.riw.us X-AntiAbuse: Original Domain - irtf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - riw.us X-Get-Message-Sender-Via: server.riw.us: authenticated_id: russw@riw.us X-Source: X-Source-Args: X-Source-Dir: Message-Id: <20131113160153.0306321E8063@ietfa.amsl.com> Cc: David Meyer , "sdn@irtf.org" Subject: Re: [Sdn] Timeliness WAS(Re: Thoughts on Defining control andManagement Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 13 Nov 2013 16:01:59 -0000 --_B6CB3B0D-2CCD-41DB-89B9-407F8E8080A5_ Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" =3D=3D > Control processes are automatic, triggered by events and timers, > and the logic behind them straightforward. > Management operations are initiated, and are directly motivated by > high-level (business/mission related) concerns. > Dont agree 100% but it is the closest thing I have heard to what we have been trying to say. =3D=3D Don't agree... It doesn't matter what initiates the action, it matters what= the functionality is. Defining this by what initiates means processes and = functions move as where they are initiated from. A static route to implemen= t policy is management, while a static route to create a forwarding path is= control plane -- down this path lies confusion. A functional model, not an intentional model. :-) Russ -----Original Message----- From: "Jamal Hadi Salim" Sent: =E2=80=8E11/=E2=80=8E13/=E2=80=8E2013 7:51 AM To: "Yaakov Stein" Cc: "Russ White" ; "David Meyer" ; "sdn@irtf.o= rg" Subject: Re: [Sdn] Timeliness WAS(Re: Thoughts on Defining control andManag= ement Planes On Wed, Nov 13, 2013 at 2:02 AM, Yaakov Stein wrote: > No, a management plane operation doesn't become a control plane > one just because it is faster. > Indeed. I think the timeliness factor is already being proven of importance by desire to make netconf move faster. Netconf is a protocol that was designed to be management. And it is now used in some cases to do control operations - it is natural to think its timeliness needs to improve (as that draft tries to). > In general, control plane operations are faster because they are local >r= ather than having to suffer a round-trip time, or because they are >automat= ic rather than having a human in the loop. > Is going a cross a small number of hops local (CE<-->FE)? > But there are exceptions. Configuring using a terminal directly plugged i= nto >a box is management plane, although it is very local. > Agreed. > Control processes are automatic, triggered by events and timers, > and the logic behind them straightforward. > Management operations are initiated, and are directly motivated by > high-level (business/mission related) concerns. > Dont agree 100% but it is the closest thing I have heard to what we have been trying to say. cheers, jamal --_B6CB3B0D-2CCD-41DB-89B9-407F8E8080A5_ Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset="utf-8"
=3D=3D
&= gt; Control processes are automatic, triggered by events and timers,
>= ; and the logic behind them straightforward.
> Management operations = are initiated, and are directly motivated by
> high-level (business/m= ission related) concerns.
>

Dont agree 100% but it is the clos= est thing I have heard
to what we have been trying to say.
=3D=3D
=
Don't agree... It doesn't matter what initiates the action, it matters = what the functionality is. Defining this by what initiates means processes = and functions move as where they are initiated from. A static route to impl= ement policy is management, while a static route to create a forwarding pat= h is control plane -- down this path lies confusion.

A functional mo= del, not an intentional model.

:-)

Russ
On Wed, Nov 13, 2013 at= 2:02 AM, Yaakov Stein <yaakov_s@rad.com> wrote:
> No, a manage= ment plane operation doesn't become a control plane
> one just becaus= e it is faster.
>

Indeed.
I think the timeliness factor is = already being proven of importance
by desire to make netconf move faster= . Netconf is a protocol that
was designed to be management. And it is no= w used in some
cases to do control operations - it is natural to think i= ts timeliness
needs to improve (as that draft tries to).

> In = general, control plane operations are faster because they are local >rat= her than having to suffer a round-trip time, or because they are >automa= tic rather than having a human in the loop.
>

Is going a cross= a small number of hops local (CE<-->FE)?

> But there are e= xceptions. Configuring using a terminal directly plugged into >a box is = management plane, although it is very local.
>

Agreed.

= > Control processes are automatic, triggered by events and timers,
&g= t; and the logic behind them straightforward.
> Management operations= are initiated, and are directly motivated by
> high-level (business/= mission related) concerns.
>

Dont agree 100% but it is the clo= sest thing I have heard
to what we have been trying to say.

cheer= s,
jamal
= --_B6CB3B0D-2CCD-41DB-89B9-407F8E8080A5_-- From cpignata@cisco.com Wed Nov 13 08:07:23 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 552B821E80AE for ; Wed, 13 Nov 2013 08:07:23 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -110.599 X-Spam-Level: X-Spam-Status: No, score=-110.599 tagged_above=-999 required=5 tests=[AWL=0.000, BAYES_00=-2.599, RCVD_IN_DNSWL_HI=-8, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id U6gv+WKQrH5E for ; Wed, 13 Nov 2013 08:07:18 -0800 (PST) Received: from rcdn-iport-2.cisco.com (rcdn-iport-2.cisco.com [173.37.86.73]) by ietfa.amsl.com (Postfix) with ESMTP id 2FD8F21E8063 for ; Wed, 13 Nov 2013 08:07:18 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=3152; q=dns/txt; s=iport; t=1384358838; x=1385568438; h=from:to:cc:subject:date:message-id:references: in-reply-to:mime-version; bh=jlqVaz5UNwjcA0vOdnCAxJiL7zY//ys+9FzrTlQ162w=; b=DWduZNfyz4iZcd9sSJICWqrXHjA030UCKQmX0SFEudWhFcbG16DzV36E goPlNSgu4OwpiHDu8GZjn1AMSOcuJqR5OLUYzID3cKA7Tmw3vkOcOagAo eJs6u8rhhid9BUniKKzugJu1/uTC+UXgHtUMIcYuG3MM3qL/eNthlOEO3 4=; X-Files: signature.asc : 203 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AgsFAE2ig1KtJXG//2dsb2JhbABbgwc4U78pgSMWdIIlAQEBAwEBAQFrBAcFCwIBCBguJwslAgQOBQ6HbQYNwBcEjQeBD4FJB4MggREDkDCBMIYwkguDKIFxOQ X-IronPort-AV: E=Sophos;i="4.93,693,1378857600"; d="asc'?scan'208";a="284264767" Received: from rcdn-core2-4.cisco.com ([173.37.113.191]) by rcdn-iport-2.cisco.com with ESMTP; 13 Nov 2013 16:07:17 +0000 Received: from xhc-rcd-x14.cisco.com (xhc-rcd-x14.cisco.com [173.37.183.88]) by rcdn-core2-4.cisco.com (8.14.5/8.14.5) with ESMTP id rADG7HYW006370 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Wed, 13 Nov 2013 16:07:17 GMT Received: from xmb-aln-x02.cisco.com ([169.254.5.229]) by xhc-rcd-x14.cisco.com ([173.37.183.88]) with mapi id 14.03.0123.003; Wed, 13 Nov 2013 10:07:17 -0600 From: "Carlos Pignataro (cpignata)" To: Pedro Martinez-Julia Thread-Topic: [Sdn] Thoughts on Defining control and Management Planes Thread-Index: AQHO36uD/u+OlmfOgkWiOEaQKwlUDpoiHRcAgAGc/gA= Date: Wed, 13 Nov 2013 16:07:17 +0000 Message-ID: <44539909-7F28-49E8-92C6-8C2803960141@cisco.com> References: <66422454-39A4-40F0-BFF6-986BFC4CAF9A@riw.us> <016301cedfab$7620b620$62622260$@riw.us> <20131112152906.GP18189@um.es> In-Reply-To: <20131112152906.GP18189@um.es> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: x-originating-ip: [64.102.157.229] Content-Type: multipart/signed; boundary="Apple-Mail=_5F9CC32E-98EB-4A0B-93F5-32E70643E73B"; protocol="application/pgp-signature"; micalg=pgp-sha1 MIME-Version: 1.0 Cc: SDN IRTF list Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 13 Nov 2013 16:07:23 -0000 --Apple-Mail=_5F9CC32E-98EB-4A0B-93F5-32E70643E73B Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii On Nov 12, 2013, at 10:29 AM, Pedro Martinez-Julia = wrote: > On Tue, Nov 12, 2013 at 08:31:14AM -0500, Russ White wrote: >>=20 >> Given your definition --these things are all in continuous operation, = so >> they must all be control plane: >>=20 >> - Forwarding of packets >> - Detection of down links >> - Flooding and maintenance of topology information >> - Monitoring of cpu thermals >> - Monitoring of memory utilization >> - Logging >> - Reactive configuration to black hole attacks >>=20 >> So these are all control plane --what, precisely, is the data plane = or even >> the management plane? If I ask, "Is link utilization monitoring = control or >> management plane (since this model doesn't have a data plane)," the = answer >> is, "It depends on whether or not the process monitoring the link >> utilization is push or pull." That doesn't make any sense to me --it = doesn't >> convey useful information on which I can try to understand the = relationship >> between the moving parts involved. >>=20 >=20 > Those functions/operations are not all part of the control plane. The > difference between the control plane and the management plane is that > the former is *required* by the network (or its individual devices) to > work as expected while the management plane is not strictly required = but > permits to know the status and to define the *expected* behavior of = the > network (or, also, individual devices). I do not think this definition can stand much test. Part of the problem = from my perspective is that "*required*" needs further qualification. = For example, I'd suggest that gathering stats for billing customers = would be argued as "required by the network to work as expected" by a = service provider. If a device calls home / an NMS to bootstrap = something, is that control plane? What about management interfaces of = defices? Just my $0.02. -- Carlos. >=20 >> :-) >>=20 >> Russ=20 >>=20 >=20 > Regards, > Pedro >=20 > --=20 > Pedro Martinez-Julia > Department of Communication and Information Engineering > Faculty of Computer Science > University of Murcia > Email: pedromj@um.es > --------------------------------------------------------- > *** Entia non sunt multiplicanda praeter necessitatem *** > _______________________________________________ > sdn mailing list > sdn@irtf.org > https://www.irtf.org/mailman/listinfo/sdn --Apple-Mail=_5F9CC32E-98EB-4A0B-93F5-32E70643E73B Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename="signature.asc" Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Message signed with OpenPGP using GPGMail -----BEGIN PGP SIGNATURE----- Comment: GPGTools - http://gpgtools.org iEYEARECAAYFAlKDo7QACgkQtfDPGTp3USzXMACfShGlfNMC6aJYuqc2HGKQ8xUw 7/8AnjOJeyTLYIve4Eiuh82CTbth+0EH =Oo3G -----END PGP SIGNATURE----- --Apple-Mail=_5F9CC32E-98EB-4A0B-93F5-32E70643E73B-- From russw@riw.us Wed Nov 13 08:08:33 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4E38021E8158 for ; Wed, 13 Nov 2013 08:08:30 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.598 X-Spam-Level: X-Spam-Status: No, score=-2.598 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id TzwG2LiOw6tZ for ; Wed, 13 Nov 2013 08:08:24 -0800 (PST) Received: from server.riw.us (server.riw.us [162.144.32.236]) by ietfa.amsl.com (Postfix) with ESMTP id 0505021E80F4 for ; Wed, 13 Nov 2013 08:08:23 -0800 (PST) Received: from mobile-166-147-070-132.mycingular.net ([166.147.70.132]:53512 helo=[10.143.231.33]) by server.riw.us with esmtpa (Exim 4.80.1) (envelope-from ) id 1VgczE-0001hL-OD; Wed, 13 Nov 2013 16:08:12 +0000 MIME-Version: 1.0 To: Jamal Hadi Salim , Yaakov Stein From: Russ White Date: Wed, 13 Nov 2013 10:07:28 -0600 Content-Type: multipart/alternative; boundary="_5C7011DA-18C0-471B-97E9-4541FFA5B032_" X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server.riw.us X-AntiAbuse: Original Domain - irtf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - riw.us X-Get-Message-Sender-Via: server.riw.us: authenticated_id: russw@riw.us X-Source: X-Source-Args: X-Source-Dir: Message-Id: <20131113160824.0505021E80F4@ietfa.amsl.com> Cc: David Meyer , "sdn@irtf.org" Subject: Re: [Sdn] Timeliness WAS(Re: Thoughts on Defining control andManagement Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 13 Nov 2013 16:08:35 -0000 --_5C7011DA-18C0-471B-97E9-4541FFA5B032_ Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" To put it another way --"what does it do?," not, "who does this?" :-) Russ=20 -----Original Message----- From: "Jamal Hadi Salim" Sent: =E2=80=8E11/=E2=80=8E13/=E2=80=8E2013 7:51 AM To: "Yaakov Stein" Cc: "Russ White" ; "David Meyer" ; "sdn@irtf.o= rg" Subject: Re: [Sdn] Timeliness WAS(Re: Thoughts on Defining control andManag= ement Planes On Wed, Nov 13, 2013 at 2:02 AM, Yaakov Stein wrote: > No, a management plane operation doesn't become a control plane > one just because it is faster. > Indeed. I think the timeliness factor is already being proven of importance by desire to make netconf move faster. Netconf is a protocol that was designed to be management. And it is now used in some cases to do control operations - it is natural to think its timeliness needs to improve (as that draft tries to). > In general, control plane operations are faster because they are local >r= ather than having to suffer a round-trip time, or because they are >automat= ic rather than having a human in the loop. > Is going a cross a small number of hops local (CE<-->FE)? > But there are exceptions. Configuring using a terminal directly plugged i= nto >a box is management plane, although it is very local. > Agreed. > Control processes are automatic, triggered by events and timers, > and the logic behind them straightforward. > Management operations are initiated, and are directly motivated by > high-level (business/mission related) concerns. > Dont agree 100% but it is the closest thing I have heard to what we have been trying to say. cheers, jamal --_5C7011DA-18C0-471B-97E9-4541FFA5B032_ Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset="utf-8"

To put = it another way --"what does it do?," not, "who does this?"

:-)
Russ
On Wed, Nov 13, 2013 at= 2:02 AM, Yaakov Stein <yaakov_s@rad.com> wrote:
> No, a manage= ment plane operation doesn't become a control plane
> one just becaus= e it is faster.
>

Indeed.
I think the timeliness factor is = already being proven of importance
by desire to make netconf move faster= . Netconf is a protocol that
was designed to be management. And it is no= w used in some
cases to do control operations - it is natural to think i= ts timeliness
needs to improve (as that draft tries to).

> In = general, control plane operations are faster because they are local >rat= her than having to suffer a round-trip time, or because they are >automa= tic rather than having a human in the loop.
>

Is going a cross= a small number of hops local (CE<-->FE)?

> But there are e= xceptions. Configuring using a terminal directly plugged into >a box is = management plane, although it is very local.
>

Agreed.

= > Control processes are automatic, triggered by events and timers,
&g= t; and the logic behind them straightforward.
> Management operations= are initiated, and are directly motivated by
> high-level (business/= mission related) concerns.
>

Dont agree 100% but it is the clo= sest thing I have heard
to what we have been trying to say.

cheer= s,
jamal
= --_5C7011DA-18C0-471B-97E9-4541FFA5B032_-- From cpignata@cisco.com Wed Nov 13 08:25:14 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 25DAC11E812D for ; Wed, 13 Nov 2013 08:25:14 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -110.598 X-Spam-Level: X-Spam-Status: No, score=-110.598 tagged_above=-999 required=5 tests=[AWL=-0.000, BAYES_00=-2.599, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-8, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id VWKn26YEqk3x for ; Wed, 13 Nov 2013 08:25:01 -0800 (PST) Received: from rcdn-iport-1.cisco.com (rcdn-iport-1.cisco.com [173.37.86.72]) by ietfa.amsl.com (Postfix) with ESMTP id 059D321F9D5E for ; Wed, 13 Nov 2013 08:25:00 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=5990; q=dns/txt; s=iport; t=1384359901; x=1385569501; h=from:to:cc:subject:date:message-id:references: in-reply-to:mime-version; bh=rXseFlTE8cCboQZvvIflEKO/PjU9AgFtORoQkUwH/Xk=; b=CeIZuoaSWzvVvom/2UFoRTPCEDd9PdFGQhGCCNo90/qItKyTmfyO7sGO ygPCJda7xjLLO6fn3hOMtYM3T/PUlDnXIGNiLd0nU1qFcMEU0IRyI+lyk uV0fzbARfsWp60TK5VGszpsbeaPa0TRU1BK01j2qkxE/C6NRc5nWdtAd8 M=; X-Files: signature.asc : 203 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: Ag4FAG+ng1KtJV2c/2dsb2JhbABbgkNEOFOCdbwzgSMWdIIlAQEBAwEBAQEgSwsQAgEIEQQBASsCAicLHQgCBA4FDodhAwkGDa1JiGoNiVAEjG0aglgHgms1gREDkDCBMIRFgWuMU4U4gyiCKg X-IronPort-AV: E=Sophos;i="4.93,693,1378857600"; d="asc'?scan'208,217";a="284116987" Received: from rcdn-core-5.cisco.com ([173.37.93.156]) by rcdn-iport-1.cisco.com with ESMTP; 13 Nov 2013 16:25:00 +0000 Received: from xhc-rcd-x01.cisco.com (xhc-rcd-x01.cisco.com [173.37.183.75]) by rcdn-core-5.cisco.com (8.14.5/8.14.5) with ESMTP id rADGP0Pw001793 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Wed, 13 Nov 2013 16:25:00 GMT Received: from xmb-aln-x02.cisco.com ([169.254.5.229]) by xhc-rcd-x01.cisco.com ([173.37.183.75]) with mapi id 14.03.0123.003; Wed, 13 Nov 2013 10:24:59 -0600 From: "Carlos Pignataro (cpignata)" To: Russ White Thread-Topic: [Sdn] Thoughts on Defining control and Management Planes Thread-Index: AQHO37vg/u+OlmfOgkWiOEaQKwlUDpojvuiA Date: Wed, 13 Nov 2013 16:24:59 +0000 Message-ID: References: <20131112152923.C267C11E8181@ietfa.amsl.com> In-Reply-To: <20131112152923.C267C11E8181@ietfa.amsl.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: x-originating-ip: [64.102.157.229] Content-Type: multipart/signed; boundary="Apple-Mail=_F299B290-6205-49A1-A918-6F1FA334D554"; protocol="application/pgp-signature"; micalg=pgp-sha1 MIME-Version: 1.0 Cc: tim copley , "sdn@irtf.org" Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 13 Nov 2013 16:25:14 -0000 --Apple-Mail=_F299B290-6205-49A1-A918-6F1FA334D554 Content-Type: multipart/alternative; boundary="Apple-Mail=_AA7DB8C8-3183-4499-A91B-243C442EEA3F" --Apple-Mail=_AA7DB8C8-3183-4499-A91B-243C442EEA3F Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 On Nov 12, 2013, at 10:28 AM, Russ White wrote: >=20 > My general point is we should be building a model based on function, = rather than time scales or network services as a baseline. I agree -- and I'd add not based on whether elements are "required" or = "expected". Thanks, -- Carlos. >=20 > :-) >=20 > Russ > From: tim copley > Sent: =E2=80=8E11/=E2=80=8E12/=E2=80=8E2013 8:56 AM > To: sdn@irtf.org > Subject: Re: [Sdn] Thoughts on Defining control and Management Planes >=20 > So I've been giving this a lot of thought during this discussion and I=20= > think what the problem is that BFD can be used in multiple "planes" > My thinking was swayed both ways, and what I eventually came to > was the realization. >=20 > It can be used in the data plane to stop traffic or pull an interface = down=20 > It can be used in the control plane, buy feeding information to a = Routing=20 > protocol or actually be a part of the routing protocol that will make = a=20 > control plan decision > It can be used as information feed to a management plane. >=20 > Perhaps it is as somebody said that it's the function performed. BFD > is just one of the tools in our toolbox for providing information into = our > SDN system. But I thought we were building models? >=20 > TimC > --=20 > "Speed is fine, but accuracy is final." Wyatt Earp, 1888 > _______________________________________________ > sdn mailing list > sdn@irtf.org > https://www.irtf.org/mailman/listinfo/sdn --Apple-Mail=_AA7DB8C8-3183-4499-A91B-243C442EEA3F Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8


My = general point is we should be building a model based on function, rather = than time scales or network services as a = baseline.

I agree = -- and I'd add not based on whether elements are "required" or = "expected".

Thanks,

-- = Carlos.


:-)

Russ
From: tim copley
Sent: =E2=80=8E11/=E2=80=8E12/=E2=80=8E2013 8:56 = AM
To: sdn@irtf.org
Subject: Re: [Sdn] Thoughts on Defining control and = Management Planes

So I've been giving this a lot of thought during this discussion = and I
think what the problem is that BFD can be used in multiple = "planes"
My thinking was swayed both ways, and what I eventually came = to
was the realization.

It can be used in the data plane to stop traffic or pull = an interface down
It can be used in the control plane, buy = feeding information to a Routing
protocol or actually be a part of = the routing protocol that will make a
control plan = decision
It can be used as information feed to a management = plane.

Perhaps it is as somebody said that it's the = function performed. BFD
is just one of the tools in our toolbox for = providing information into our
SDN system.  But I thought = we were building models?

TimC
--
"Speed is fine, but accuracy = is final." Wyatt Earp, 1888 =
____________________= ___________________________
sdn mailing list
sdn@irtf.org
https://www.irtf.org/mail= man/listinfo/sdn

= --Apple-Mail=_AA7DB8C8-3183-4499-A91B-243C442EEA3F-- --Apple-Mail=_F299B290-6205-49A1-A918-6F1FA334D554 Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename="signature.asc" Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Message signed with OpenPGP using GPGMail -----BEGIN PGP SIGNATURE----- Comment: GPGTools - http://gpgtools.org iEYEARECAAYFAlKDp9sACgkQtfDPGTp3USxAugCdEMZBwHE5jpO5EgdoffJEdEkL 73kAoNhgqJxTy8HAIPtUHhQgHwiXingj =mvL/ -----END PGP SIGNATURE----- --Apple-Mail=_F299B290-6205-49A1-A918-6F1FA334D554-- From cpignata@cisco.com Wed Nov 13 08:35:15 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 71D4211E814C for ; Wed, 13 Nov 2013 08:35:15 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -110.599 X-Spam-Level: X-Spam-Status: No, score=-110.599 tagged_above=-999 required=5 tests=[AWL=0.000, BAYES_00=-2.599, RCVD_IN_DNSWL_HI=-8, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id XF+ifKpUhPl8 for ; Wed, 13 Nov 2013 08:35:07 -0800 (PST) Received: from rcdn-iport-8.cisco.com (rcdn-iport-8.cisco.com [173.37.86.79]) by ietfa.amsl.com (Postfix) with ESMTP id 9487111E8162 for ; Wed, 13 Nov 2013 08:35:07 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=8032; q=dns/txt; s=iport; t=1384360507; x=1385570107; h=from:to:cc:subject:date:message-id:references: in-reply-to:mime-version; bh=NImDqmfKbDcZpYc0kQ8Xy9GxXJkaGZlFARvhoSWrIPc=; b=Ro5LWDo64NsvDwCaZmzD9pJmC04dtxvDCHCamw+Pmw6ChvNeDLz5reWG 4NZe0+Nt/u4lIrGURGGbk4BFVlJHNaybRqmbP3dLFPsZauf4f4eFzo85j Mx1dpXBHBQutNcVvhDX1gqRUhvEzBvGkRPsCzJ04YvyFYFmF81nX78117 Q=; X-Files: signature.asc : 203 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AgsFAFKpg1KtJV2c/2dsb2JhbABbgwc4U78ngSMWdIIlAQEBAwEBAQFrCwULAgEIGBUZJwslAgQOBQ6HbQYNwBiPXwcKgxaBEQOQMIEwgk6DYoEvkFyDKIIq X-IronPort-AV: E=Sophos;i="4.93,693,1378857600"; d="asc'?scan'208";a="284324037" Received: from rcdn-core-5.cisco.com ([173.37.93.156]) by rcdn-iport-8.cisco.com with ESMTP; 13 Nov 2013 16:35:07 +0000 Received: from xhc-aln-x14.cisco.com (xhc-aln-x14.cisco.com [173.36.12.88]) by rcdn-core-5.cisco.com (8.14.5/8.14.5) with ESMTP id rADGZ6gl020383 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL); Wed, 13 Nov 2013 16:35:06 GMT Received: from xmb-aln-x02.cisco.com ([169.254.5.229]) by xhc-aln-x14.cisco.com ([173.36.12.88]) with mapi id 14.03.0123.003; Wed, 13 Nov 2013 10:35:06 -0600 From: "Carlos Pignataro (cpignata)" To: Sriganesh Kini Thread-Topic: [Sdn] Thoughts on Defining control and Management Planes Thread-Index: AQHO2xqrwFWjJHD27EiGosxotvsH6ZoZhQKAgADYuwCABdNIAIAAHq4AgAAjTgCAAAVjgIAAB/KAgAACtoCAAACRgIAAe0sAgAAB0oCAAAoCAIAAIziAgAAOLgCAAA6kAIAAW7wAgAIke4A= Date: Wed, 13 Nov 2013 16:35:05 +0000 Message-ID: References: <001301ceded0$ab50b4c0$01f21e40$@riw.us> <4d2ee44e6fcb4dd18a26f8bc33c8abf1@exrad6.ad.rad.co.il> <00d201cedee5$039eaa10$0adbfe30$@riw.us> <20131111141907.GO17999@um.es> <012601cedeea$a00097b0$e001c710$@riw.us> <640DC4F7-33C2-4E24-A0D0-BB1609AE108C@cisco.com> <4D6BF497-AA24-4E5B-AC0C-DF8FB56B4759@cisco.com> <5E5AEAFC-FFC2-4917-A243-CFC3F121ACA6@cisco.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: x-originating-ip: [64.102.157.229] Content-Type: multipart/signed; boundary="Apple-Mail=_C6A79E82-A9B6-4D41-852F-240504B6D266"; protocol="application/pgp-signature"; micalg=pgp-sha1 MIME-Version: 1.0 Cc: Russ White , SDN IRTF list , Robert Raszuk , Pedro Martinez-Julia Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 13 Nov 2013 16:35:15 -0000 --Apple-Mail=_C6A79E82-A9B6-4D41-852F-240504B6D266 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii Hi, Sri, Thanks for the follow-up, please see inline. On Nov 12, 2013, at 2:52 AM, Sriganesh Kini = wrote: > Hi Carlos, see inline. >=20 > On Mon, Nov 11, 2013 at 6:23 PM, Carlos Pignataro (cpignata) > wrote: >> Hi, Sri, >>=20 >> Interesting useful conversation :-) We may be on a tangent, except = for supporting the fact that the definition of terms for these Planes is = fuzzy and not so clear... Please see inline. >=20 > I don't believe the definitions are fuzzy. I hope they are becoming > clearer through this useful conversation. I think that, net-net, we still do not have "definitions". I do agree = that things are becoming clearer and the conversation is useful. >=20 >>=20 >> On Nov 11, 2013, at 8:31 PM, Sriganesh Kini = wrote: >=20 > [snip] >=20 >>>>=20 >>>>> BFD is control-plane functionality. So is any function (that may = exist >>>>> on the line-card) that builds structures that are required for >>>>> forwarding a packet. >>>>=20 >>>> Here I disagree. BFD performs fault management for the forwarding = plane. It is, by design, decoupled from the control plane (it even has = the "C" bit for "Control Plane Independent"). >>>>=20 >>>> http://tools.ietf.org/html/rfc5880#section-2 >>>=20 >>> BFD performs fault-notification (not management) so that other >>> entities can perform useful actions to recover from faults. >>=20 >> ... or not. Specifically, where does it say "so that other entities = can perform useful actions to recover from faults"? Can you please = provide a pointer? >=20 > Maybe not in those words but if you see RFC 5882 intro "...provides a > liveness detection mechanism that can be utilized by other network > components for which their integral liveness mechanisms are either too > slow, inappropriate, or nonexistent". Those other network components > perform actions to recover from faults. I guess the difference boils down to the scope of the system you are = including. This quoted text basically says, that other functions/systems = that do not inherently have a good liveness mechanism can use BFD, as = clients to it. Basically, if you consider BFD as always a sub-system of a larger system = that includes, say, a routing protocol, the overall system performs a = control plane function. If BFD always notifies some system to take a = specific action, you are not talking about BFD but the superset. But if, = instead of merging and coalescing, you treat BFD as an atomic protocol = with APIs to other functions, it gets more tricky. Further, RFC 5882 defines an application of BFD, not the protocol = itself, and "can be utilized" to me says "can be utilized, or cannot, = and can be utilized for something else". >=20 >=20 >>=20 >> I do realize that recovery from faults is a common useful goal. = However, BFD performs fault *detection* (not notification), a subset of = fault management, but not "in order to recover" necessarily. A perfectly = valid use of BFD is to trigger a log or notification (not an action to = recover). Less useful, sure (depending the case). Valid, yes as well. >=20 > Note that in your use-case too you used ".. to trigger a log or > notification". The purpose of these is also to do a recovery. This > recovery may not be your sub-50msec switchover type of recovery. It > could be a "send a line-man to check if/why the fiber is broken and > fix it" or "re-engineer traffic to take into account this broken link" > kind of network recovery. But it is a form of recovery action. >=20 >>=20 >> The Abstract of bfd-base is quite unambiguous: >>=20 >> Abstract >>=20 >> This document describes a protocol intended to detect faults in the >> bidirectional path between two forwarding engines, including >> interfaces, data link(s), and to the extent possible the forwarding >> engines themselves, with potentially very low latency. It operates >> independently of media, data protocols, and routing protocols. >>=20 >> BFD, intended to detect forwarding plane faults, AKA fault detection. = BFD is part of the IETF's OAM toolset. >=20 > This does not imply that it is not a control-plane function. >=20 I agree, not implication meant. But I did want to call out the part that = says "it operates independently of ... routing protocols". >>=20 >>=20 >>> This even >>> includes notification to human operators. But mainly it is for the >>> control-plane so that it can perform the necessary actions so that >>> forwarding plane only drops as few packets as possible. >>=20 >> Mainly? My only point is that from a functional perspective, BFD is = not data plane and not control plane. It detects data plane failures and = (typically, yet not necessarily) informs the control plane. The "D" in = BFD for detection, it's not "R" for Restoration/Recovery. BFD does = interact with control protocols for recovery. >=20 > I agree that BFD protocol machinery is specified for detection, > however the purpose (as explained by referencing RFC 5882 above) is > for recovery. Similar to the liveness mechanisms of routing-protocols > (that BFD improves upon) being considered control-plane, so too BFD is > control-plane. >=20 > So I agree that BFD is not forwarding/data plane. But I disagree that > it is not control-plane. Maybe BFD does not have a plane unless it's applied to some function, in = which case it can be part of control plane as OAM for routing protocols, = or something else. Thanks, -- Carlos. >=20 >>=20 >>> A good >>> system-design decouples BFD fate from the route-processor (not the >>> control-plane). If BFD was always decoupled from the "control-plane" >>> there wouldn't even be a need to have the C-bit :-) >>>=20 >>> The C-bit was introduced because some older implementations at that >>> time had BFD fate-shared with the routing-protocol fate (due to BFD >>> running on the route-processor) and there was a need to distinguish = it >>> from newer BFD implementations that were not fate-shared with the >>> routing-protocol fate (due to BFD running on the line-card). The = real >>> requirement was to disentangle BFD and GR state. Note that when = C-bit >>> is not set there is risk of undetected failures as explained in >>> RFC5880 sec 4.3.2. Strictly speaking, the BFD C-bit being called >>> control-plane-independent is a misnomer since it wasn't the >>> control-plane independence but rather the independence from >>> routing-protocol fate (especially when routing-protocol is in GR >>> state) that was being expressed. To be blunt there was a need to >>> prevent the far-end of an older implementation from performing >>> recovery actions when reloading the route-processor, restarting >>> processes etc, and an unset C-bit was deployed only after accepting >>> the risks as described in RFC5880 sec 4.3.2. >>>=20 >>=20 >> Yes, should be called 'GR routing-protocol independent" -- with the = only nit that this is actually in RFC 5882 (not 5880) Section 4.3.2. >=20 > Thanks for fixing the typo. >=20 > - Sri >=20 > [snip] > _______________________________________________ > sdn mailing list > sdn@irtf.org > https://www.irtf.org/mailman/listinfo/sdn --Apple-Mail=_C6A79E82-A9B6-4D41-852F-240504B6D266 Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename="signature.asc" Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Message signed with OpenPGP using GPGMail -----BEGIN PGP SIGNATURE----- Comment: GPGTools - http://gpgtools.org iEYEARECAAYFAlKDqjkACgkQtfDPGTp3USwF+wCeKj8jLgRCalQRTMeuv109KI8Y bd0Anin1PAmcvkSxJJ9rJkkDEne7cWcp =/x+L -----END PGP SIGNATURE----- --Apple-Mail=_C6A79E82-A9B6-4D41-852F-240504B6D266-- From alan.d.clark@telchemy.com Wed Nov 13 10:13:07 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8634921E8151 for ; Wed, 13 Nov 2013 10:13:07 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.598 X-Spam-Level: X-Spam-Status: No, score=-2.598 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HTML_MESSAGE=0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id nbY5+3kHwXRX for ; Wed, 13 Nov 2013 10:13:02 -0800 (PST) Received: from omx.cbeyond.com (omx.cbeyond.com [50.20.30.10]) by ietfa.amsl.com (Postfix) with ESMTP id 6746C11E81A6 for ; Wed, 13 Nov 2013 10:13:02 -0800 (PST) X-SBRS: 4.0 X-HAT: Sender Group ONNET_RELAY, Policy $ACCEPTED applied. X-Hostname: omx02bay.sys.cbeyond.net X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AqUDAI7Ag1JFD9PBjGdsb2JhbABbgz+CdIYxtlmBJhYOAQEBJzyCJQEBAQMBAQEBawoRCw0LCRYIBwkDAgECARUfERMGAgEBh3cGBQjAFASNB4JfhDEDiUKKbIpGjm0e X-IronPort-AV: E=Sophos;i="4.93,693,1378872000"; d="scan'208,217";a="74055777" Received: from unknown (HELO alans-mbp.telchemy.com) ([69.15.211.193]) by omx.cbeyond.com with ESMTP/TLS/DHE-RSA-CAMELLIA256-SHA; 13 Nov 2013 13:13:01 -0500 Message-ID: <5283C12D.9020909@telchemy.com> Date: Wed, 13 Nov 2013 13:13:01 -0500 From: Alan Clark User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:24.0) Gecko/20100101 Thunderbird/24.1.0 MIME-Version: 1.0 To: sdn@irtf.org References: <66422454-39A4-40F0-BFF6-986BFC4CAF9A@riw.us> <016301cedfab$7620b620$62622260$@riw.us> In-Reply-To: Content-Type: multipart/alternative; boundary="------------010105040700050601050701" Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 13 Nov 2013 18:13:07 -0000 This is a multi-part message in MIME format. --------------010105040700050601050701 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit How about a definition along the following lines? The functionality of a switching or routing system is typically divided into three layers, Data Plane, Control Plane and Management Plane. As network architectures evolve, the functions incorporated into these planes may change; for example adaptive algorithms incorporated into the Control Plane may automate configuration or optimization tasks that would historically be performed by the Management Plane. The Data Plane is distributed throughout the network and exists within each network node. The Data Plane provides switch, routing, transformation and filtering functions such as packet forwarding, encapsulation and address translation. These functions and the associated interfaces are configured by the Control Plane. The Control Plane may be distributed or centralized and is primarily responsible for configuration of the Data Plane. Typical Control Plane functions include maintaining knowledge of the local or global topology and current loading of the network, calculating optimal routes through the network based on policy and with minimal cost, instantiating the route by configuring the Data Plane in the nodes traversed by the route and maintaining data on the routes currently configured in the network. Control plane functions may also include failure handling mechanisms such as link failure detection and fail over, and automated provisioning of devices from a server. A Control Plane typically incorporates some detection and reporting of faults and exceptions, and this data is reported to (or retrieved by) the Management Plane. If the Control Plane was disconnected from the Data Plane then the current configuration of the Data Plane would remain unchanged (i.e. no new routes would be set up, no new devices would be provisioned...) and data could still be forwarded according to that configuration. The Management Plane is typically centralized and is primarily responsible for ensuring that the network or system is running optimally when viewed from an overall service and business perspective. The Management Plane will effect this by gathering data from the network on usage, performance and faults, determining either manually or automatically if changes to the configuration of the Control Plane would improve overall performance, resource utilization, security and reliability of the network and those services or applications running over it and making changes to Control Plane configuration if needed, converting collected data into accounting information for billing or operational cost models, and overriding the normal operation of the Control Plane to handle exception conditions. A Management Plane always includes some element of reporting faults and exceptions to human operators. If the Management Plane was disconnected from the Control Plane, the network would continue to operate normally however issues or traffic pattern changes that affect the performance and reliability of the network may not be detected and the network may operate sub-optimally. As a non-network example - the set of traffic lights at a junction have a local control function (Control Plane element) that applies a configured set of rules to decide when to change lights based on time and road sensors. This may be locally optimal in terms of minimum queuing delay at a junction however may not be globally optimal. A Management Plane would have visibility over the entire road system and could make adjustments to the rules used by each local control function in order to achieve global optimization. If at some future time the local control functions become integrated into a system-wide Control Plane and this is able to use system-wide data to optimize traffic light operation across the network then it has become a more intelligent Control Plane and the Management Plane's role evolves to one of controlling the configuration of the system-wide optimization algorithm. Regards Alan On 11/13/13, 9:33 AM, Scott Brim wrote: > On Tue, Nov 12, 2013 at 8:31 AM, Russ White > wrote: > > > > > For me the difference is between something that is > supposed to be > > in continuous operation, and something that is supposed to set > up that > > continuous operation. I see the former as control plane and > forwarding > > plane, and the latter as management. When you perform a management > > function, then you can sit back and watch to make sure you did > it right. > A > > control function, on the other hand, continues _as part of_ > things going > right. > > > > I think this merges the control and data planes, though -- > and I > think > > we want to be able to differentiate between them. > > > > Russ, maybe it merges your concepts of planes, but I'm trying to > get you > to > > use different concepts. In what I said, control and management > are clearly > > separated. We can get to specifics if you like, as tests of > conceptual > models. > > Just keep in mind that components function in multiple planes > > simultaneously. > > Given your definition --these things are all in continuous operation, > > > That's not what I meant to say, and sorry for using those words. > Trying again: management sets up and monitors the network machinery, > while control operates it. I'll give up on getting succinct sound > bytes soon. > > so > they must all be control plane: > > > You know that's impossible. > > - Forwarding of packets > > > Forwarding. > > (One nit is that forwarding of control or management plane packets has > generally not been considered "forwarding plane" -- it's special in > the abstract, even though in IP networks transport of control/mgmt is > actually done using the same IP forwarding mechanisms.) > > - Detection of down links > > > Categorizing that, and others below, depends on the function that > receives the result. What does it do? If it changes configuration, > it's management. If it changes behavior for now but does not change > configuration, it's control. > > - Flooding and maintenance of topology information > > > Control > > - Monitoring of cpu thermals > > - Monitoring of memory utilization > > > Again, it depends on how the information will be responded to. The > information isn't the point, it's whether it's used for management or > control. > > - Logging > > > Management. > > - Reactive configuration to black hole attacks > > > Good one. I would call this a rapid response of management. > > The last time I tried to define planes was in Y.2011. Here, I > originally thought the goal was to have consistency with other > definitions of "planes", but it looks like these definitions are just > going to be used in SDNRG (they already disagree with at least one > other SDN group). If all this is local scope, whatever you all decide > on is fine. I look forward to a draft. > > Scott > > > _______________________________________________ > sdn mailing list > sdn@irtf.org > https://www.irtf.org/mailman/listinfo/sdn --------------010105040700050601050701 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit How about a definition along the following lines?

The functionality of a switching or routing system is typically divided into three layers, Data Plane, Control Plane and Management Plane. As network architectures evolve, the functions incorporated into these planes may change; for example adaptive algorithms incorporated into the Control Plane may automate configuration or optimization tasks that would historically be performed by the Management Plane.

The Data Plane is distributed throughout the network and exists within each network node. The Data Plane provides switch, routing, transformation and filtering functions such as packet forwarding, encapsulation and address translation.  These functions and the associated interfaces are configured by the Control Plane.

The Control Plane may be distributed or centralized and is primarily responsible for configuration of the Data Plane. Typical Control Plane functions include maintaining knowledge of the local or global topology and current loading of the network, calculating optimal routes through the network based on policy and with minimal cost, instantiating the route by configuring the Data Plane in the nodes traversed by the route and maintaining data on the routes currently configured in the network. Control plane functions may also include failure handling mechanisms such as link failure detection and fail over, and automated provisioning of devices from a server.  A Control Plane typically incorporates some detection and reporting of faults and exceptions, and this data is reported to (or retrieved by) the Management Plane. If the Control Plane was disconnected from the Data Plane then the current configuration of the Data Plane would remain unchanged (i.e. no new routes would be set up, no new devices would be provisioned...) and data could still be forwarded according to that configuration.

The Management Plane is typically centralized and is primarily responsible for ensuring that the network or system is running optimally when viewed from an overall service and business perspective. The Management Plane will effect this by gathering data from the network on usage, performance and faults, determining either manually or automatically if changes to the configuration of the Control Plane would improve overall performance, resource utilization, security and reliability of the network and those services or applications running over it and making changes to Control Plane configuration if needed, converting collected data into accounting information for billing or operational cost models, and overriding the normal operation of the Control Plane to handle exception conditions.  A Management Plane always includes some element of reporting faults and exceptions to human operators. If the Management Plane was disconnected from the Control Plane, the network would continue to operate normally however issues or traffic pattern changes that affect the performance and reliability of the network may not be detected and the network may operate sub-optimally.

As a non-network example - the set of traffic lights at a junction have a local control function (Control Plane element) that applies a configured set of rules to decide when to change lights based on time and road sensors. This may be locally optimal in terms of minimum queuing delay at a junction however may not be globally optimal. A Management Plane would have visibility over the entire road system and could make adjustments to the rules used by each local control function in order to achieve global optimization. If at some future time the local control functions become integrated into a system-wide Control Plane and this is able to use system-wide data to optimize traffic light operation across the network then it has become a more intelligent Control Plane and the Management Plane's role evolves to one of controlling the configuration of the system-wide optimization algorithm.

Regards

Alan


On 11/13/13, 9:33 AM, Scott Brim wrote:
On Tue, Nov 12, 2013 at 8:31 AM, Russ White <russw@riw.us> wrote:

>       > For me the difference is between something that is supposed to be
> in continuous operation, and something that is supposed to set up that
> continuous operation.  I see the former as control plane and forwarding
> plane, and the latter as management.  When you perform a management
> function, then you can sit back and watch to make sure you did it right.
A
> control function, on the other hand, continues _as part of_ things going
right.
>
>       I think this merges the control and data planes, though -- and I
think
> we want to be able to differentiate between them.
>
> Russ, maybe it merges your concepts of planes, but I'm trying to get you
to
> use different concepts. In what I said, control and management are clearly
> separated. We can get to specifics if you like, as tests of conceptual
models.
> Just keep in mind that components function in multiple planes
> simultaneously.

Given your definition --these things are all in continuous operation,

That's not what I meant to say, and sorry for using those words. Trying again: management sets up and monitors the network machinery, while control operates it. I'll give up on getting succinct sound bytes soon.
 
so
they must all be control plane:

You know that's impossible.
 
- Forwarding of packets

Forwarding. 

(One nit is that forwarding of control or management plane packets has generally not been considered "forwarding plane" -- it's special in the abstract, even though in IP networks transport of control/mgmt is actually done using the same IP forwarding mechanisms.)
 
- Detection of down links

Categorizing that, and others below, depends on the function that receives the result. What does it do? If it changes configuration, it's management. If it changes behavior for now but does not change configuration, it's control.
 
- Flooding and maintenance of topology information

Control
 
- Monitoring of cpu thermals 
- Monitoring of memory utilization

Again, it depends on how the information will be responded to.  The information isn't the point, it's whether it's used for management or control.
 
- Logging

Management.
 
- Reactive configuration to black hole attacks

Good one. I would call this a rapid response of management.

The last time I tried to define planes was in Y.2011.  Here, I originally thought the goal was to have consistency with other definitions of "planes", but it looks like these definitions are just going to be used in SDNRG (they already disagree with at least one other SDN group). If all this is local scope, whatever you all decide on is fine. I look forward to a draft.

Scott


_______________________________________________
sdn mailing list
sdn@irtf.org
https://www.irtf.org/mailman/listinfo/sdn

--------------010105040700050601050701-- From russw@riw.us Wed Nov 13 10:46:59 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A2F1211E815C for ; Wed, 13 Nov 2013 10:46:59 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.598 X-Spam-Level: X-Spam-Status: No, score=-2.598 tagged_above=-999 required=5 tests=[AWL=-0.000, BAYES_00=-2.599, HTML_MESSAGE=0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id deLDkzXdLwwJ for ; Wed, 13 Nov 2013 10:46:52 -0800 (PST) Received: from server.riw.us (server.riw.us [162.144.32.236]) by ietfa.amsl.com (Postfix) with ESMTP id 4DF4A11E8104 for ; Wed, 13 Nov 2013 10:46:48 -0800 (PST) Received: from mobile-166-147-070-132.mycingular.net ([166.147.70.132]:54476 helo=[10.143.231.33]) by server.riw.us with esmtpa (Exim 4.80.1) (envelope-from ) id 1VgfSZ-0003Bt-7f; Wed, 13 Nov 2013 18:46:43 +0000 MIME-Version: 1.0 To: Alan Clark , "sdn@irtf.org" From: Russ White Date: Wed, 13 Nov 2013 12:45:54 -0600 Content-Type: multipart/alternative; boundary="_6DD87656-F3F8-4C51-959D-8853AEE27710_" X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server.riw.us X-AntiAbuse: Original Domain - irtf.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - riw.us X-Get-Message-Sender-Via: server.riw.us: authenticated_id: russw@riw.us X-Source: X-Source-Args: X-Source-Dir: Message-Id: <20131113184648.4DF4A11E8104@ietfa.amsl.com> Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 13 Nov 2013 18:46:59 -0000 --_6DD87656-F3F8-4C51-959D-8853AEE27710_ Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" If the definitions change over time, then we can't build stable interfaces = and their associated data models, nor can we understand how to compare one = network or service model against another.... So... I'd argue for a functional model (what it does), that is going to be = stable over time... Not time, service, or "who did this," or... :-) Russ -----Original Message----- From: "Alan Clark" Sent: =E2=80=8E11/=E2=80=8E13/=E2=80=8E2013 12:13 PM To: "sdn@irtf.org" Subject: Re: [Sdn] Thoughts on Defining control and Management Planes How about a definition along the following lines? The functionality of a switching or routing system is typically divided int= o three layers, Data Plane, Control Plane and Management Plane. As network = architectures evolve, the functions incorporated into these planes may chan= ge; for example adaptive algorithms incorporated into the Control Plane may= automate configuration or optimization tasks that would historically be pe= rformed by the Management Plane. The Data Plane is distributed throughout the network and exists within each= network node. The Data Plane provides switch, routing, transformation and = filtering functions such as packet forwarding, encapsulation and address tr= anslation. These functions and the associated interfaces are configured by= the Control Plane.=20 The Control Plane may be distributed or centralized and is primarily respon= sible for configuration of the Data Plane. Typical Control Plane functions = include maintaining knowledge of the local or global topology and current l= oading of the network, calculating optimal routes through the network based= on policy and with minimal cost, instantiating the route by configuring th= e Data Plane in the nodes traversed by the route and maintaining data on th= e routes currently configured in the network. Control plane functions may a= lso include failure handling mechanisms such as link failure detection and = fail over, and automated provisioning of devices from a server. A Control = Plane typically incorporates some detection and reporting of faults and exc= eptions, and this data is reported to (or retrieved by) the Management Plan= e. If the Control Plane was disconnected from the Data Plane then the curre= nt configuration of the Data Plane would remain unchanged (i.e. no new rout= es would be set up, no new devices would be provisioned...) and data could = still be forwarded according to that configuration. The Management Plane is typically centralized and is primarily responsible = for ensuring that the network or system is running optimally when viewed fr= om an overall service and business perspective. The Management Plane will e= ffect this by gathering data from the network on usage, performance and fau= lts, determining either manually or automatically if changes to the configu= ration of the Control Plane would improve overall performance, resource uti= lization, security and reliability of the network and those services or app= lications running over it and making changes to Control Plane configuration= if needed, converting collected data into accounting information for billi= ng or operational cost models, and overriding the normal operation of the C= ontrol Plane to handle exception conditions. A Management Plane always inc= ludes some element of reporting faults and exceptions to human operators. I= f the Management Plane was disconnected from the Control Plane, the network= would continue to operate normally however issues or traffic pattern chang= es that affect the performance and reliability of the network may not be de= tected and the network may operate sub-optimally. As a non-network example - the set of traffic lights at a junction have a l= ocal control function (Control Plane element) that applies a configured set= of rules to decide when to change lights based on time and road sensors. T= his may be locally optimal in terms of minimum queuing delay at a junction = however may not be globally optimal. A Management Plane would have visibili= ty over the entire road system and could make adjustments to the rules used= by each local control function in order to achieve global optimization. If= at some future time the local control functions become integrated into a s= ystem-wide Control Plane and this is able to use system-wide data to optimi= ze traffic light operation across the network then it has become a more int= elligent Control Plane and the Management Plane's role evolves to one of co= ntrolling the configuration of the system-wide optimization algorithm.=20 Regards Alan On 11/13/13, 9:33 AM, Scott Brim wrote: On Tue, Nov 12, 2013 at 8:31 AM, Russ White wrote: > > For me the difference is between something that is supposed to be > in continuous operation, and something that is supposed to set up that > continuous operation. I see the former as control plane and forwarding > plane, and the latter as management. When you perform a management > function, then you can sit back and watch to make sure you did it right. A > control function, on the other hand, continues _as part of_ things going right. > > I think this merges the control and data planes, though -- and I think > we want to be able to differentiate between them. > > Russ, maybe it merges your concepts of planes, but I'm trying to get you to > use different concepts. In what I said, control and management are clearl= y > separated. We can get to specifics if you like, as tests of conceptual models. > Just keep in mind that components function in multiple planes > simultaneously. Given your definition --these things are all in continuous operation,=20 That's not what I meant to say, and sorry for using those words. Trying aga= in: management sets up and monitors the network machinery, while control op= erates it. I'll give up on getting succinct sound bytes soon. =20 so they must all be control plane: You know that's impossible. =20 - Forwarding of packets Forwarding.=20 (One nit is that forwarding of control or management plane packets has gene= rally not been considered "forwarding plane" -- it's special in the abstrac= t, even though in IP networks transport of control/mgmt is actually done us= ing the same IP forwarding mechanisms.) =20 - Detection of down links Categorizing that, and others below, depends on the function that receives = the result. What does it do? If it changes configuration, it's management. = If it changes behavior for now but does not change configuration, it's cont= rol. =20 - Flooding and maintenance of topology information Control =20 - Monitoring of cpu thermals=20 - Monitoring of memory utilization Again, it depends on how the information will be responded to. The informa= tion isn't the point, it's whether it's used for management or control. =20 - Logging Management. =20 - Reactive configuration to black hole attacks Good one. I would call this a rapid response of management. The last time I tried to define planes was in Y.2011. Here, I originally t= hought the goal was to have consistency with other definitions of "planes",= but it looks like these definitions are just going to be used in SDNRG (th= ey already disagree with at least one other SDN group). If all this is loca= l scope, whatever you all decide on is fine. I look forward to a draft. Scott =20 _______________________________________________ sdn mailing list sdn@irtf.org https://www.irtf.org/mailman/listinfo/sdn= --_6DD87656-F3F8-4C51-959D-8853AEE27710_ Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset="utf-8"

If the = definitions change over time, then we can't build stable interfaces and the= ir associated data models, nor can we understand how to compare one network= or service model against another....

So... I'd argue for a function= al model (what it does), that is going to be stable over time... Not time, = service, or "who did this," or...

:-)

Russ
From: Alan Clark
Sent: =E2=80=8E11/=E2=80=8E13/=E2=80=8E2013 12:13 PMTo: sdn@irtf.org
Subject: Re: [Sdn] Thoughts on Defining control and Management Planes

How about a definition along the following lines?

Th= e functionality of a switching or routing system is typically divided into = three layers, Data Plane, Control Plane and Management Plane. As network ar= chitectures evolve, the functions incorporated into these planes may change= ; for example adaptive algorithms incorporated into the Control Plane may a= utomate configuration or optimization tasks that would historically be perf= ormed by the Management Plane.

The Data Plane is distributed through= out the network and exists within each network node. The Data Plane provide= s switch, routing, transformation and filtering functions such as packet fo= rwarding, encapsulation and address translation.  These functions and = the associated interfaces are configured by the Control Plane.

The = Control Plane may be distributed or centralized and is primarily responsibl= e for configuration of the Data Plane. Typical Control Plane functions incl= ude maintaining knowledge of the local or global topology and current loadi= ng of the network, calculating optimal routes through the network based on = policy and with minimal cost, instantiating the route by configuring the Da= ta Plane in the nodes traversed by the route and maintaining data on the ro= utes currently configured in the network. Control plane functions may also = include failure handling mechanisms such as link failure detection and fail= over, and automated provisioning of devices from a server.  A Control= Plane typically incorporates some detection and reporting of faults and ex= ceptions, and this data is reported to (or retrieved by) the Management Pla= ne. If the Control Plane was disconnected from the Data Plane then the curr= ent configuration of the Data Plane would remain unchanged (i.e. no new rou= tes would be set up, no new devices would be provisioned...) and data could= still be forwarded according to that configuration.

The Management = Plane is typically centralized and is primarily responsible for ensuring th= at the network or system is running optimally when viewed from an overall s= ervice and business perspective. The Management Plane will effect this by g= athering data from the network on usage, performance and faults, determinin= g either manually or automatically if changes to the configuration of the C= ontrol Plane would improve overall performance, resource utilization, secur= ity and reliability of the network and those services or applications runni= ng over it and making changes to Control Plane configuration if needed, con= verting collected data into accounting information for billing or operation= al cost models, and overriding the normal operation of the Control Plane to= handle exception conditions.  A Management Plane always includes some= element of reporting faults and exceptions to human operators. If the Mana= gement Plane was disconnected from the Control Plane, the network would con= tinue to operate normally however issues or traffic pattern changes that af= fect the performance and reliability of the network may not be detected and= the network may operate sub-optimally.

As a non-network example - t= he set of traffic lights at a junction have a local control function (Contr= ol Plane element) that applies a configured set of rules to decide when to = change lights based on time and road sensors. This may be locally optimal i= n terms of minimum queuing delay at a junction however may not be globally = optimal. A Management Plane would have visibility over the entire road syst= em and could make adjustments to the rules used by each local control funct= ion in order to achieve global optimization. If at some future time the loc= al control functions become integrated into a system-wide Control Plane and= this is able to use system-wide data to optimize traffic light operation a= cross the network then it has become a more intelligent Control Plane and t= he Management Plane's role evolves to one of controlling the configuration = of the system-wide optimization algorithm.

Regards

Alan
<= BR>
On 11/13/13, 9:33 AM, Scott Brim wrote:
On Tue, Nov 12, 2013 at 8:31 AM, Russ White <russw@riw.us> wrote:

>    =   > For me the difference is between something that is supposed to= be
> in continuous operation, and something that is supposed to set = up that
> continuous operation.  I see the former as control pla= ne and forwarding
> plane, and the latter as management.  When y= ou perform a management
> function, then you can sit back and watch t= o make sure you did it right.
A
> control function, on the other h= and, continues _as part of_ things going
right.
>
>   &= nbsp;   I think this merges the control and data planes, though -- and= I
think
> we want to be able to differentiate between them.
&g= t;
> Russ, maybe it merges your concepts of planes, but I'm trying to= get you
to
> use different concepts. In what I said, control and = management are clearly
> separated. We can get to specifics if you li= ke, as tests of conceptual
models.
> Just keep in mind that compon= ents function in multiple planes
> simultaneously.

Given your = definition --these things are all in continuous operation,

That's not what I meant to say, and sorry for using those words. Tryin= g again: management sets up and monitors the network machinery, while contr= ol operates it. I'll give up on getting succinct sound bytes soon.
 
so
they must all be= control plane:

You know that's impossible.
 
- Forwarding of packet= s

Forwarding. 

(One nit is that forwarding of control or management plane packets has= generally not been considered "forwarding plane" -- it's special in the ab= stract, even though in IP networks transport of control/mgmt is actually do= ne using the same IP forwarding mechanisms.)
 
- Detection of down li= nks

Categorizing that, and others below, depends on the function that rece= ives the result. What does it do? If it changes configuration, it's managem= ent. If it changes behavior for now but does not change configuration, it's= control.
 
- Flooding and mainten= ance of topology information

Control
 
- Monitoring of cpu th= ermals 
- Monitoring of memory= utilization

Again, it depends on how the information will be responded to.  T= he information isn't the point, it's whether it's used for management or co= ntrol.
 
- Logging

Management.
 
- Reactive configurati= on to black hole attacks

Good one. I would call this a rapid response of management.

The last time I tried to define planes was in Y.2011.  Here, I or= iginally thought the goal was to have consistency with other definitions of= "planes", but it looks like these definitions are just going to be used in= SDNRG (they already disagree with at least one other SDN group). If all th= is is local scope, whatever you all decide on is fine. I look forward to a = draft.

Scott


_____=
__________________________________________
sdn mailing list
sdn@irtf.o=
rg
https://www.irtf.org/mailman/listinfo/sdn

= --_6DD87656-F3F8-4C51-959D-8853AEE27710_-- From sriganeshkini@gmail.com Wed Nov 13 12:24:56 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 89BAF21E814D for ; Wed, 13 Nov 2013 12:24:56 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.978 X-Spam-Level: X-Spam-Status: No, score=-1.978 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id hsqxxpMlLsI8 for ; Wed, 13 Nov 2013 12:24:56 -0800 (PST) Received: from mail-pb0-x22c.google.com (mail-pb0-x22c.google.com [IPv6:2607:f8b0:400e:c01::22c]) by ietfa.amsl.com (Postfix) with ESMTP id 3730921F9D53 for ; Wed, 13 Nov 2013 12:24:54 -0800 (PST) Received: by mail-pb0-f44.google.com with SMTP id rp16so942948pbb.17 for ; Wed, 13 Nov 2013 12:24:54 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:from:date:message-id :subject:to:cc:content-type:content-transfer-encoding; bh=r4twyLMQXX8eJFWxxmXzYKQMotPHpsH8z5gPpl/U4FE=; b=mIiurzfCtFj0wQBTU9uq1yi8kky3nBmvx7K/Oiq3hdR8NVfdbiJwB8ZRJgMReIhbTp 8v8Nmcknu3sLt1zor9uN0zVpm2dkuoFPv9XbcOFl1WsMBYpGEX5LMlutUpdlaCLkUxXK EXV/e2oHwt0ErQVtm6l4UTkvIQ2jYnlTn5ZaEXry5XJmWgB8XgdCGzAb2X3Te7CdRVJ5 4tsfglM9XzJcXTRIVp8NxYtR5ExRwFhSR9mKGigs4211KJNm0zDabohNrh79CJJrdBvE LMS6kI2v8GpdHKN7b+qIy/TURSmw6sXhEIs+O3jg/kLhadoEP6deWzTnmToSNm3mB8qX P9GQ== X-Received: by 10.68.221.5 with SMTP id qa5mr43585404pbc.36.1384374293953; Wed, 13 Nov 2013 12:24:53 -0800 (PST) MIME-Version: 1.0 Sender: sriganeshkini@gmail.com Received: by 10.70.0.228 with HTTP; Wed, 13 Nov 2013 12:24:22 -0800 (PST) In-Reply-To: References: <001301ceded0$ab50b4c0$01f21e40$@riw.us> <4d2ee44e6fcb4dd18a26f8bc33c8abf1@exrad6.ad.rad.co.il> <00d201cedee5$039eaa10$0adbfe30$@riw.us> <20131111141907.GO17999@um.es> <012601cedeea$a00097b0$e001c710$@riw.us> <640DC4F7-33C2-4E24-A0D0-BB1609AE108C@cisco.com> <4D6BF497-AA24-4E5B-AC0C-DF8FB56B4759@cisco.com> <5E5AEAFC-FFC2-4917-A243-CFC3F121ACA6@cisco.com> From: Sriganesh Kini Date: Wed, 13 Nov 2013 12:24:22 -0800 X-Google-Sender-Auth: PhlEiOs3sDdMugtp8hcBL5-YkXo Message-ID: To: "Carlos Pignataro (cpignata)" Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Cc: Russ White , SDN IRTF list , Pedro Martinez-Julia , Robert Raszuk Subject: Re: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 13 Nov 2013 20:24:56 -0000 Hi Carlos, On Wed, Nov 13, 2013 at 8:35 AM, Carlos Pignataro (cpignata) wrote: > Hi, Sri, > > Thanks for the follow-up, please see inline. [snip] >> I don't believe the definitions are fuzzy. I hope they are becoming >> clearer through this useful conversation. > > I think that, net-net, we still do not have "definitions". I do agree tha= t things are becoming clearer and the conversation is useful. > As things become clearer, I am sure the definitions will follow. >> [snip] >> >> Maybe not in those words but if you see RFC 5882 intro "...provides a >> liveness detection mechanism that can be utilized by other network >> components for which their integral liveness mechanisms are either too >> slow, inappropriate, or nonexistent". Those other network components >> perform actions to recover from faults. > > I guess the difference boils down to the scope of the system you are incl= uding. This quoted text basically says, that other functions/systems that d= o not inherently have a good liveness mechanism can use BFD, as clients to = it. Agree. Liveness test mechanisms are control-plane functions > > Basically, if you consider BFD as always a sub-system of a larger system = that includes, say, a routing protocol, the overall system performs a contr= ol plane function. If BFD always notifies some system to take a specific ac= tion, you are not talking about BFD but the superset. But if, instead of me= rging and coalescing, you treat BFD as an atomic protocol with APIs to othe= r functions, it gets more tricky. > The fact that an entity has an API should not change which plane it belongs= to. > Further, RFC 5882 defines an application of BFD, not the protocol itself,= and "can be utilized" to me says "can be utilized, or cannot, and can be u= tilized for something else". > It there are other uses, I would like to see the related applicability RFC. >> >> [snip] >> This does not imply that it is not a control-plane function. >> > > I agree, not implication meant. But I did want to call out the part that = says "it operates independently of ... routing protocols". > True. And since a control-plane consists of more than just the routing-protocols .... >>> [snip] > > Maybe BFD does not have a plane unless it's applied to some function, in = which case it can be part of control plane as OAM for routing protocols, or= something else. > Right on ! With the exception that if BFD is not applied to any function then one has to ask "If a tree falls in a forest ..." :-) Thanks - Sri [snip] From sarlimatti@gmail.com Thu Nov 14 03:15:38 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5814621E80D0 for ; Thu, 14 Nov 2013 03:15:38 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.297 X-Spam-Level: X-Spam-Status: No, score=-2.297 tagged_above=-999 required=5 tests=[AWL=0.302, BAYES_00=-2.599, HTML_MESSAGE=0.001, NO_RELAYS=-0.001] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id JDp5tLWYUrW8 for ; Thu, 14 Nov 2013 03:15:36 -0800 (PST) Received: from mail-pa0-x230.google.com (mail-pa0-x230.google.com [IPv6:2607:f8b0:400e:c03::230]) by ietfa.amsl.com (Postfix) with ESMTP id 9F61921E81B2 for ; Thu, 14 Nov 2013 03:15:36 -0800 (PST) Received: by mail-pa0-f48.google.com with SMTP id bj1so1892644pad.35 for ; Thu, 14 Nov 2013 03:15:36 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:date:message-id:subject:from:to:content-type; bh=5bobPkUF98rAmpPNfNd25WnlARVRcXjW2HUHob2Ru8M=; b=koMCfVXEEC+64SqvmBIpfzj7iNrVG3L+YlAGaMyFIIVwXQ8LkkwwgQ8LPBSzPT4xbZ HYCo7RSgZr4XtV8eEmKcbS9aghexatbmmQxWZ35b6NO5zCnbu+3PVEY8DlPslcrVOKPx 2jZQIzG2p6ApFb2efjN/ns4bK3IJBJPDvNThe7zZx9iZd2pGsYQBuILfkojDJgqTBxUF 8IzaT05VX7wB2hdlo3Q1yq3IZKEQuYtF6KpsgC1rg8Q0jhaimiSCYcRT5Neuh2o/jmfd x7ATzbn2u7DS2/ogVkJ8BRST5r6O2thA4hBEnbUBS9euQwMUdQQcjNGCsIKh1HOIGq/F v6Xw== MIME-Version: 1.0 X-Received: by 10.66.102.39 with SMTP id fl7mr828191pab.43.1384427736124; Thu, 14 Nov 2013 03:15:36 -0800 (PST) Received: by 10.70.28.161 with HTTP; Thu, 14 Nov 2013 03:15:36 -0800 (PST) Date: Thu, 14 Nov 2013 19:15:36 +0800 Message-ID: From: Shivleela Arlimatti To: sdn@irtf.org Content-Type: multipart/alternative; boundary=047d7bd9164e6dd20704eb2133a3 Subject: [Sdn] Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 14 Nov 2013 11:15:38 -0000 --047d7bd9164e6dd20704eb2133a3 Content-Type: text/plain; charset=ISO-8859-1 Hi to all Really after reading all these definitions we the budding researchers will get lot of information about subject.. even we want to contribute something..may be it will take time ...we need to get more knowledge... any way thanks to all Shivaleela Arlimatti Research scholar, InterNetworks Research Lab, CAS UUM Sintok, Malaysia. On Thu, Nov 14, 2013 at 4:01 AM, wrote: > If you have received this digest without all the individual message > attachments you will need to update your digest options in your list > subscription. To do so, go to > > https://www.irtf.org/mailman/listinfo/sdn > > Click the 'Unsubscribe or edit options' button, log in, and set "Get > MIME or Plain Text Digests?" to MIME. You can set this option > globally for all the list digests you receive at this point. > > > > Send sdn mailing list submissions to > sdn@irtf.org > > To subscribe or unsubscribe via the World Wide Web, visit > https://www.irtf.org/mailman/listinfo/sdn > or, via email, send a message with subject or body 'help' to > sdn-request@irtf.org > > You can reach the person managing the list at > sdn-owner@irtf.org > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of sdn digest..." > > > Today's Topics: > > 1. Re: Thoughts on Defining control and Management Planes > (Russ White) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Wed, 13 Nov 2013 12:45:54 -0600 > From: Russ White > To: Alan Clark , "sdn@irtf.org" > > Subject: Re: [Sdn] Thoughts on Defining control and Management Planes > Message-ID: <20131113184648.4DF4A11E8104@ietfa.amsl.com> > Content-Type: text/plain; charset="utf-8" > > > If the definitions change over time, then we can't build stable interfaces > and their associated data models, nor can we understand how to compare one > network or service model against another.... > > So... I'd argue for a functional model (what it does), that is going to be > stable over time... Not time, service, or "who did this," or... > > :-) > > Russ > > -----Original Message----- > From: "Alan Clark" > Sent: ?11/?13/?2013 12:13 PM > To: "sdn@irtf.org" > Subject: Re: [Sdn] Thoughts on Defining control and Management Planes > > How about a definition along the following lines? > > The functionality of a switching or routing system is typically divided > into three layers, Data Plane, Control Plane and Management Plane. As > network architectures evolve, the functions incorporated into these planes > may change; for example adaptive algorithms incorporated into the Control > Plane may automate configuration or optimization tasks that would > historically be performed by the Management Plane. > > The Data Plane is distributed throughout the network and exists within > each network node. The Data Plane provides switch, routing, transformation > and filtering functions such as packet forwarding, encapsulation and > address translation. These functions and the associated interfaces are > configured by the Control Plane. > > The Control Plane may be distributed or centralized and is primarily > responsible for configuration of the Data Plane. Typical Control Plane > functions include maintaining knowledge of the local or global topology and > current loading of the network, calculating optimal routes through the > network based on policy and with minimal cost, instantiating the route by > configuring the Data Plane in the nodes traversed by the route and > maintaining data on the routes currently configured in the network. Control > plane functions may also include failure handling mechanisms such as link > failure detection and fail over, and automated provisioning of devices from > a server. A Control Plane typically incorporates some detection and > reporting of faults and exceptions, and this data is reported to (or > retrieved by) the Management Plane. If the Control Plane was disconnected > from the Data Plane then the current configuration of the Data Plane would > remain unchanged (i.e. no new routes would be set > up, no new devices would be provisioned...) and data could still be > forwarded according to that configuration. > > The Management Plane is typically centralized and is primarily responsible > for ensuring that the network or system is running optimally when viewed > from an overall service and business perspective. The Management Plane will > effect this by gathering data from the network on usage, performance and > faults, determining either manually or automatically if changes to the > configuration of the Control Plane would improve overall performance, > resource utilization, security and reliability of the network and those > services or applications running over it and making changes to Control > Plane configuration if needed, converting collected data into accounting > information for billing or operational cost models, and overriding the > normal operation of the Control Plane to handle exception conditions. A > Management Plane always includes some element of reporting faults and > exceptions to human operators. If the Management Plane was disconnected > from the Control Plane, the network would continue > to operate normally however issues or traffic pattern changes that > affect the performance and reliability of the network may not be detected > and the network may operate sub-optimally. > > As a non-network example - the set of traffic lights at a junction have a > local control function (Control Plane element) that applies a configured > set of rules to decide when to change lights based on time and road > sensors. This may be locally optimal in terms of minimum queuing delay at a > junction however may not be globally optimal. A Management Plane would have > visibility over the entire road system and could make adjustments to the > rules used by each local control function in order to achieve global > optimization. If at some future time the local control functions become > integrated into a system-wide Control Plane and this is able to use > system-wide data to optimize traffic light operation across the network > then it has become a more intelligent Control Plane and the Management > Plane's role evolves to one of controlling the configuration of the > system-wide optimization algorithm. > > Regards > > Alan > > > > On 11/13/13, 9:33 AM, Scott Brim wrote: > > On Tue, Nov 12, 2013 at 8:31 AM, Russ White wrote: > > > > > For me the difference is between something that is supposed to be > > in continuous operation, and something that is supposed to set up that > > continuous operation. I see the former as control plane and forwarding > > plane, and the latter as management. When you perform a management > > function, then you can sit back and watch to make sure you did it right. > A > > control function, on the other hand, continues _as part of_ things going > right. > > > > I think this merges the control and data planes, though -- and I > think > > we want to be able to differentiate between them. > > > > Russ, maybe it merges your concepts of planes, but I'm trying to get you > to > > use different concepts. In what I said, control and management are > clearly > > separated. We can get to specifics if you like, as tests of conceptual > models. > > Just keep in mind that components function in multiple planes > > simultaneously. > > Given your definition --these things are all in continuous operation, > > > That's not what I meant to say, and sorry for using those words. Trying > again: management sets up and monitors the network machinery, while control > operates it. I'll give up on getting succinct sound bytes soon. > > so > they must all be control plane: > > > You know that's impossible. > > - Forwarding of packets > > > > Forwarding. > > > (One nit is that forwarding of control or management plane packets has > generally not been considered "forwarding plane" -- it's special in the > abstract, even though in IP networks transport of control/mgmt is actually > done using the same IP forwarding mechanisms.) > > > - Detection of down links > > > > Categorizing that, and others below, depends on the function that receives > the result. What does it do? If it changes configuration, it's management. > If it changes behavior for now but does not change configuration, it's > control. > > - Flooding and maintenance of topology information > > > > Control > > - Monitoring of cpu thermals > - Monitoring of memory utilization > > > > Again, it depends on how the information will be responded to. The > information isn't the point, it's whether it's used for management or > control. > > - Logging > > > > Management. > > - Reactive configuration to black hole attacks > > > > Good one. I would call this a rapid response of management. > > > The last time I tried to define planes was in Y.2011. Here, I originally > thought the goal was to have consistency with other definitions of > "planes", but it looks like these definitions are just going to be used in > SDNRG (they already disagree with at least one other SDN group). If all > this is local scope, whatever you all decide on is fine. I look forward to > a draft. > > > > Scott > > > > _______________________________________________ > sdn mailing list > sdn@irtf.org > https://www.irtf.org/mailman/listinfo/sdn > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > http://www.irtf.org/mail-archive/web/sdn/attachments/20131113/269aa603/attachment.htm > > > > ------------------------------ > > _______________________________________________ > sdn mailing list > sdn@irtf.org > https://www.irtf.org/mailman/listinfo/sdn > > > End of sdn Digest, Vol 19, Issue 31 > *********************************** > --047d7bd9164e6dd20704eb2133a3 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
Hi to all
=A0Really after reading all these definition= s we the budding researchers will get lot of =A0information about subject..= even we want to contribute something..may be it will take time ...we need = to get more knowledge...
any way thanks to all



Shivaleela Arlimatti
Re= search scholar,
InterNetworks Research Lab, CAS
UUM Sinto= k, Malaysia.=A0


On Thu, Nov 14, 2013 at 4:01 AM, <s= dn-request@irtf.org> wrote:
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Today's Topics:

=A0 =A01. Re: Thoughts on Defining control and Management Planes
=A0 =A0 =A0 (Russ White)


----------------------------------------------------------------------

Message: 1
Date: Wed, 13 Nov 2013 12:45:54 -0600
From: Russ White <russw@riw.us> To: Alan Clark <alan.d.clar= k@telchemy.com>, "sdn@irtf.org<= /a>"
=A0 =A0 =A0 =A0 <sdn@irtf.org> Subject: Re: [Sdn] Thoughts on Defining control and Management Planes
Message-ID: <20131113184648.4DF4A11E8104@ietfa.amsl.com>
Content-Type: text/plain; charset=3D"utf-8"


If the definitions change over time, then we can't build stable interfa= ces and their associated data models, nor can we understand how to compare = one network or service model against another....

So... I'd argue for a functional model (what it does), that is going to= be stable over time... Not time, service, or "who did this," or.= ..

:-)

Russ

-----Original Message-----
From: "Alan Clark" <alan.d.clark@telchemy.com>
Sent: ?11/?13/?2013 12:13 PM
To: "sdn@irtf.org" <sdn@irtf.org>
Subject: Re: [Sdn] Thoughts on Defining control and Management Planes

How about a definition along the following lines?

The functionality of a switching or routing system is typically divided int= o three layers, Data Plane, Control Plane and Management Plane. As network = architectures evolve, the functions incorporated into these planes may chan= ge; for example adaptive algorithms incorporated into the Control Plane may= automate configuration or optimization tasks that would historically be pe= rformed by the Management Plane.

The Data Plane is distributed throughout the network and exists within each= network node. The Data Plane provides switch, routing, transformation and = filtering functions such as packet forwarding, encapsulation and address tr= anslation. =A0These functions and the associated interfaces are configured = by the Control Plane.

The Control Plane may be distributed or centralized and is primarily respon= sible for configuration of the Data Plane. Typical Control Plane functions = include maintaining knowledge of the local or global topology and current l= oading of the network, calculating optimal routes through the network based= on policy and with minimal cost, instantiating the route by configuring th= e Data Plane in the nodes traversed by the route and maintaining data on th= e routes currently configured in the network. Control plane functions may a= lso include failure handling mechanisms such as link failure detection and = fail over, and automated provisioning of devices from a server. =A0A Contro= l Plane typically incorporates some detection and reporting of faults and e= xceptions, and this data is reported to (or retrieved by) the Management Pl= ane. If the Control Plane was disconnected from the Data Plane then the cur= rent configuration of the Data Plane would remain unchanged (i.e. no new ro= utes would be set
=A0 up, no new devices would be provisioned...) and data could still be for= warded according to that configuration.

The Management Plane is typically centralized and is primarily responsible = for ensuring that the network or system is running optimally when viewed fr= om an overall service and business perspective. The Management Plane will e= ffect this by gathering data from the network on usage, performance and fau= lts, determining either manually or automatically if changes to the configu= ration of the Control Plane would improve overall performance, resource uti= lization, security and reliability of the network and those services or app= lications running over it and making changes to Control Plane configuration= if needed, converting collected data into accounting information for billi= ng or operational cost models, and overriding the normal operation of the C= ontrol Plane to handle exception conditions. =A0A Management Plane always i= ncludes some element of reporting faults and exceptions to human operators.= If the Management Plane was disconnected from the Control Plane, the netwo= rk would continue
=A0 to operate normally however issues or traffic pattern changes that affe= ct the performance and reliability of the network may not be detected and t= he network may operate sub-optimally.

As a non-network example - the set of traffic lights at a junction have a l= ocal control function (Control Plane element) that applies a configured set= of rules to decide when to change lights based on time and road sensors. T= his may be locally optimal in terms of minimum queuing delay at a junction = however may not be globally optimal. A Management Plane would have visibili= ty over the entire road system and could make adjustments to the rules used= by each local control function in order to achieve global optimization. If= at some future time the local control functions become integrated into a s= ystem-wide Control Plane and this is able to use system-wide data to optimi= ze traffic light operation across the network then it has become a more int= elligent Control Plane and the Management Plane's role evolves to one o= f controlling the configuration of the system-wide optimization algorithm.<= br>
Regards

Alan



On 11/13/13, 9:33 AM, Scott Brim wrote:

On Tue, Nov 12, 2013 at 8:31 AM, Russ White <russw@riw.us> wrote:


> =A0 =A0 =A0 > For me the difference is between something that is su= pposed to be
> in continuous operation, and something that is supposed to set up that=
> continuous operation. =A0I see the former as control plane and forward= ing
> plane, and the latter as management. =A0When you perform a management<= br> > function, then you can sit back and watch to make sure you did it righ= t.
A
> control function, on the other hand, continues _as part of_ things goi= ng
right.
>
> =A0 =A0 =A0 I think this merges the control and data planes, though --= and I
think
> we want to be able to differentiate between them.
>
> Russ, maybe it merges your concepts of planes, but I'm trying to g= et you
to
> use different concepts. In what I said, control and management are cle= arly
> separated. We can get to specifics if you like, as tests of conceptual=
models.
> Just keep in mind that components function in multiple planes
> simultaneously.

Given your definition --these things are all in continuous operation,


That's not what I meant to say, and sorry for using those words. Trying= again: management sets up and monitors the network machinery, while contro= l operates it. I'll give up on getting succinct sound bytes soon.

so
they must all be control plane:


You know that's impossible.

- Forwarding of packets



Forwarding.


(One nit is that forwarding of control or management plane packets has gene= rally not been considered "forwarding plane" -- it's special = in the abstract, even though in IP networks transport of control/mgmt is ac= tually done using the same IP forwarding mechanisms.)


- Detection of down links



Categorizing that, and others below, depends on the function that receives = the result. What does it do? If it changes configuration, it's manageme= nt. If it changes behavior for now but does not change configuration, it= 9;s control.

- Flooding and maintenance of topology information



Control

- Monitoring of cpu thermals
- Monitoring of memory utilization



Again, it depends on how the information will be responded to. =A0The infor= mation isn't the point, it's whether it's used for management o= r control.

- Logging



Management.

- Reactive configuration to black hole attacks



Good one. I would call this a rapid response of management.


The last time I tried to define planes was in Y.2011. =A0Here, I originally= thought the goal was to have consistency with other definitions of "p= lanes", but it looks like these definitions are just going to be used = in SDNRG (they already disagree with at least one other SDN group). If all = this is local scope, whatever you all decide on is fine. I look forward to = a draft.



Scott



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End of sdn Digest, Vol 19, Issue 31
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--047d7bd9164e6dd20704eb2133a3-- From hadi@mojatatu.com Thu Nov 14 04:17:37 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5251A21E8090 for ; Thu, 14 Nov 2013 04:17:37 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.963 X-Spam-Level: X-Spam-Status: No, score=-102.963 tagged_above=-999 required=5 tests=[AWL=0.014, BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, RCVD_IN_DNSWL_LOW=-1, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 91riC4Fq9Pot for ; Thu, 14 Nov 2013 04:17:31 -0800 (PST) Received: from mail-ve0-f170.google.com (mail-ve0-f170.google.com [209.85.128.170]) by ietfa.amsl.com (Postfix) with ESMTP id D810111E80F1 for ; Thu, 14 Nov 2013 04:17:30 -0800 (PST) Received: by mail-ve0-f170.google.com with SMTP id db12so1763238veb.15 for ; Thu, 14 Nov 2013 04:17:30 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc:content-type; bh=rLfakU131QeDb20c0f2x5F3JSGqzhlsvgrRamBoiw9o=; b=kmk4DZUcYj7vKAYcDXowZNshsVpGRBKjK6wAS5wVDvXRtcVH1cem1rH3eo9l6Z/N7N XZFIJshw8+XanMnJ3NXKLtRzXb4SnE3rPgefiprBOBDJCdEhlDEnOj+FXg2gbMaC8+IO 2WGoAEcTuqFPPYNLohDgMg9fjGAcwGSjncpdiC96MZWliHP1+4MEYfjXnmFO6w2vSMnX 2cOwrPhZJcf/gwcsjMAKtWwTXvoRZ7MUJ696hfgYOVoVU6NDFdvn9bZDGdon0S3JHqzq mTKRQXgJtPvNTqyw88mB5CqzHw5CkyKfNCTjFmJDbxLZKBW9Be3ZBVm3YkSOlau0yHXo dehg== X-Gm-Message-State: ALoCoQmjA+6pv9TWawmOutRviG2u+BCjdNwHQYKbNWvbDJ35pFcV8Ah3RnceH5Ho/1XZgFsTIs1T X-Received: by 10.52.171.198 with SMTP id aw6mr373892vdc.51.1384431450105; Thu, 14 Nov 2013 04:17:30 -0800 (PST) MIME-Version: 1.0 Received: by 10.58.8.19 with HTTP; Thu, 14 Nov 2013 04:17:09 -0800 (PST) In-Reply-To: <5283a3f5.6307420a.0e92.413cSMTPIN_ADDED_MISSING@mx.google.com> References: <5283a3f5.6307420a.0e92.413cSMTPIN_ADDED_MISSING@mx.google.com> From: Jamal Hadi Salim Date: Thu, 14 Nov 2013 07:17:09 -0500 Message-ID: To: Russ White Content-Type: text/plain; charset=ISO-8859-1 Cc: David Meyer , Yaakov Stein , "sdn@irtf.org" Subject: Re: [Sdn] Timeliness WAS(Re: Thoughts on Defining control andManagement Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 14 Nov 2013 12:17:37 -0000 I dont think "What does it do?" is sufficient Russ. Given we are talking about existing interfaces and not inventing new ones, our starting point is/was to ask of an interface "What was it intended to do?" which lead us to "What do i want to use it for?". This is all in the background of the hype around the SDN terrain. We are not trying to be judge/jury/executor about what SDN is (if you are selling expect scripts around CLIs as SDN, hey that is SDN too) but we felt it was important to provide distinguishing characteristics in order to provide coloring or shades of grey on the SDN landscape. >From that perspective, it then becomes important to reference what the design intent and _history_ of an interfaces are in order to provide a reasonable taxanomy as context to answer the above question. Example: 1) Netconf was _intended_ to be an interface for management/config. Common "management" interfaces were at play. It was _intended to be human friendly and have a human loop. Those are the requirements it was optimized for. 2) ForCES was intended to be a control interface. It was intended to have low latency in control updates and have high throughput in bulk table updates. You can use both ForCES and netconf to do FIB table updates. But that detail does not qualify the "what do i want to use it for?" where the "I" is the brainy part - lets call it app (its execution location is not important, can sit on a switch/control engine etc). My control/management app/brain activity is not necessarily tied to one interface. I may use a reachability change from a management interface(BFD) to invoke a control activity that deletes or adds a table entry (ForCES). The collision course is when there is conflict of intent between "What" an interface was intended to achieve and the intent of "who" is using it. This is the crux of the issues. The conflict needs to be described via attributes. Timeliness is one. cheers, jamal On Wed, Nov 13, 2013 at 11:07 AM, Russ White wrote: > > To put it another way --"what does it do?," not, "who does this?" > > :-) > > Russ > ________________________________ > From: Jamal Hadi Salim > Sent: 11/13/2013 7:51 AM > To: Yaakov Stein > Cc: Russ White; David Meyer; sdn@irtf.org > Subject: Re: [Sdn] Timeliness WAS(Re: Thoughts on Defining control > andManagement Planes > > On Wed, Nov 13, 2013 at 2:02 AM, Yaakov Stein wrote: >> No, a management plane operation doesn't become a control plane >> one just because it is faster. >> > > Indeed. > I think the timeliness factor is already being proven of importance > by desire to make netconf move faster. Netconf is a protocol that > was designed to be management. And it is now used in some > cases to do control operations - it is natural to think its timeliness > needs to improve (as that draft tries to). > >> In general, control plane operations are faster because they are local >> >rather than having to suffer a round-trip time, or because they are >> >automatic rather than having a human in the loop. >> > > Is going a cross a small number of hops local (CE<-->FE)? > >> But there are exceptions. Configuring using a terminal directly plugged >> into >a box is management plane, although it is very local. >> > > Agreed. > >> Control processes are automatic, triggered by events and timers, >> and the logic behind them straightforward. >> Management operations are initiated, and are directly motivated by >> high-level (business/mission related) concerns. >> > > Dont agree 100% but it is the closest thing I have heard > to what we have been trying to say. > > cheers, > jamal From nordmark@sonic.net Thu Nov 14 12:08:00 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1E6A321E80FE for ; Thu, 14 Nov 2013 12:08:00 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.517 X-Spam-Level: X-Spam-Status: No, score=-2.517 tagged_above=-999 required=5 tests=[AWL=0.082, BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id LVBURaH41hKF for ; Thu, 14 Nov 2013 12:07:55 -0800 (PST) Received: from d.mail.sonic.net (d.mail.sonic.net [64.142.111.50]) by ietfa.amsl.com (Postfix) with ESMTP id 4878811E80FA for ; Thu, 14 Nov 2013 12:07:55 -0800 (PST) Received: from [172.22.251.17] ([162.210.130.4]) (authenticated bits=0) by d.mail.sonic.net (8.14.4/8.14.4) with ESMTP id rAEK7pBb016172 (version=TLSv1/SSLv3 cipher=DHE-RSA-CAMELLIA256-SHA bits=256 verify=NOT); Thu, 14 Nov 2013 12:07:52 -0800 Message-ID: <52852D9A.8000508@sonic.net> Date: Thu, 14 Nov 2013 12:07:54 -0800 From: Erik Nordmark User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:24.0) Gecko/20100101 Thunderbird/24.0.1 MIME-Version: 1.0 To: Yaakov Stein , Jamal Hadi Salim References: <00dc01cedee6$327f9730$977ec590$@riw.us> <012501cedeea$7f46c120$7dd44360$@riw.us> <2329b8e07d8444a2808de812c4ea0e2a@exrad6.ad.rad.co.il> <4680c2f6eabd4b3a9350cf7e5cdff6f8@exrad6.ad.rad.co.il> In-Reply-To: <4680c2f6eabd4b3a9350cf7e5cdff6f8@exrad6.ad.rad.co.il> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Sonic-ID: C;8g+dcGhN4xGHkY9G53gOpw== M;Ai3tcGhN4xGHkY9G53gOpw== X-Mailman-Approved-At: Thu, 14 Nov 2013 12:11:03 -0800 Cc: Russ White , David Meyer , "sdn@irtf.org" Subject: Re: [Sdn] Timeliness WAS(Re: Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 14 Nov 2013 20:08:00 -0000 Yaakov, Your note made me think about potential differences and similarities if we look at a single device (what we've classically done), and look at a network-wide view. In the device view I see two different behaviors: D1. Decision on the device - interface down, received routing update etc. The device makes a decision. We call that control plane. D2. Decision off the device - the device is instructed to do something (provision a vlan, admin disable a port) from some external entity. The device doesn't really care whether that entity is a human, a script, or some more capable controller. We've called that management plane. If we move up to a network view I see two similar, but network-level, behaviors: N1. The network (controller) makes a decision based on some event (a router failing, some information received from a router, etc). N2. The network (controller) is instructed to do something (configure a VPN from A to B) from some external entity. (Note that for both N1 and N2 the device is likely to see the outcome as D2 i.e., the device being instructed to do something without the device making any decisions.) I think that we are trying to use the terms we have for D1 and D2 in the network-level view, and that doesn't seem to fit well. Perhaps we need some new terms for N1 and N2? Erik On 11/12/13 11:02 PM, Yaakov Stein wrote: > No, a management plane operation doesn't become a control plane one just because it is faster. > > In general, control plane operations are faster because they are local rather than having to suffer a round-trip time, or because they are automatic rather than having a human in the loop. > > But there are exceptions. Configuring using a terminal directly plugged into a box is management plane, although it is very local. > > Control processes are automatic, triggered by events and timers, > and the logic behind them straightforward. > Management operations are initiated, and are directly motivated by high-level (business/mission related) concerns. > > Y(J)S > > > -----Original Message----- > From: Jamal Hadi Salim [mailto:hadi@mojatatu.com] > Sent: 12 November, 2013 21:55 > To: Yaakov Stein > Cc: Russ White; David Meyer; sdn@irtf.org > Subject: Re: [Sdn] Timeliness WAS(Re: Thoughts on Defining control and Management Planes > > Yaakov, > Thanks for the insight. > > So question: for lack of better wording, is the "accelaration" (or maybe it is > "velocity") towards consistency unimportant? > IOW, If i can update a 500K FIB table 100x faster with ForCES than with Netconf, does that not make them different? > > cheers, > jamal > > PS:- I am not here to judge merits of the two, i think they have their place. > If updating the tables was unimportant and usability is more important i would likely pick netconf. This is what we set out to do and i dont think the message is getting across. > > > > On Tue, Nov 12, 2013 at 1:20 PM, Yaakov Stein wrote: >> No, consistency and availability are quite different >> >> Consistency means that if you sent two packet in rapid succession, >> they would be handled in the same (and hopefully correct) way. >> >> Availability means that the packet is immediately handled, even if incorrectly. >> >> So, if in OF you start a new flow, the packet is not matched and so is sent to the controller. >> The flow now hangs until the controller receives the packet, figures out what to do with the flow, and configures all the match tables of all the switches. >> This is a lack of availability. >> From now on the packets belonging to the flow are all handled consistently. >> >> What happens if a link breaks ? >> In a well-engineered network protection switching immediately >> compensates, thus guaranteeing availability, even if the packets are now handled differently (lack of consistency). >> In a best-effort OSPF network, a link-down will cause the router >> before the break to immediately Dijkstra the next packet along a new path - also availability at the expense of consistency. The new path may even lead to black-holing - really inconsistent behavior. >> >> What happens if we need to send a packet belonging to a new flow to >> the controller and the controller (or a link to it) fails ? >> Then either we can wait until the controller CAN respond (unavailable) >> or decide to forward according to conventional (pre-SDN) methods (inconsistent). >> >> Y(J)S >> >> >> -----Original Message----- >> From: Jamal Hadi Salim [mailto:hadi@mojatatu.com] >> Sent: 12 November, 2013 13:31 >> To: Yaakov Stein >> Cc: Russ White; David Meyer; sdn@irtf.org >> Subject: Re: [Sdn] Timeliness WAS(Re: Thoughts on Defining control and >> Management Planes >> >> On Mon, Nov 11, 2013 at 12:48 PM, Yaakov Stein wrote: >>> No, we needn't put absolute times. >>> >> >> Ok, agreed. >> I was hoping there would be a good paper to what Dave Meyer pointed >> out >> here: >> http://cmg.soton.ac.uk/research/projects/separation-of-timescales-in-m >> odels-of-complex-networks/ >> >>> The times of importance are those that would signify unavailability for the particular application. >>> >>> Thus for interactive applications the times would be shorter than for progressive download ones. >>> >>> In the old days when voice was the only application, 100 ms was the >>> gold standard, and so protection switching was required to be mo more than 50 ms. >> >> I think what you say above may help me make the point. >> Can we equate "consistency" to what you refer to as "unavailability"? >> i.e. if i was able to update a FIB table at 10K/s then i would be able to reach consistency faster than if i did it at 1K/s Given that design intent of "management" interfaces was mostly targeted for human interaction both from usability as well as response tolerances - does automation change the fact that they are still constrained to that original design intent? I think not. >> Just because i can automate a CLI with expect does not magically change that it is slow (my tie to sense of urgency that offended Russ ;->). >> I can update tables a magnitude faster with OF than with netconf. Both are called SDN technologies. >> >> cheers, >> jamal > _______________________________________________ > sdn mailing list > sdn@irtf.org > https://www.irtf.org/mailman/listinfo/sdn > From dmm@1-4-5.net Thu Nov 14 12:28:49 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1D7B111E8127 for ; Thu, 14 Nov 2013 12:28:49 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: 0 X-Spam-Level: X-Spam-Status: No, score=x tagged_above=-999 required=5 tests=[] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id FV53CVnrQJX2 for ; Thu, 14 Nov 2013 12:28:48 -0800 (PST) Received: from mail-qe0-f48.google.com (mail-qe0-f48.google.com [209.85.128.48]) by ietfa.amsl.com (Postfix) with ESMTP id 3023621E8105 for ; Thu, 14 Nov 2013 12:28:42 -0800 (PST) Received: by mail-qe0-f48.google.com with SMTP id a11so1644099qen.7 for ; Thu, 14 Nov 2013 12:28:41 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:date:message-id:subject:from:to :content-type; bh=bGm5tIOT61M7qEMBUPgYtUeDX+dtN/ftkhrVgc8DWZ8=; b=dBtjCR6TMuim8GJEDN9t5j5WhsA/AX0zAY6TupmOBoyM8pVRO39u5Y4XPGk/MX/LT8 PG1OIfnCoSmUCNliyj6XnXkdI0LA9tipT5cTpJMY3GmISlTV80WudMTuyArcbeK0xdXG 39iPlEwq08CuB6DEsva3H/p1BZg/7TL10JSVUG4u8/X2oVMVIb6oOy9rSHxDVN6Ysps7 0PtoyAPKmLNHKZniUqA1S5mFDgKRyFedp0NweAIwOxuQVWp0WpXa0P/62OhrvSD01KS+ /RzjCMmzJOkqE4Nxqrl8zY9U7/r9MHP/VrlKWa8JH761byJkUmk4EWSdB/J2VidcKzhg IeGg== X-Gm-Message-State: ALoCoQm51GCrfJLfPB9Mxu05ePmBvLLRrrTwxJsDh7MqljgdBd2zcPKUNvD85Z/BIpPJmfq3TUfO MIME-Version: 1.0 X-Received: by 10.49.19.101 with SMTP id d5mr5201646qee.78.1384460921434; Thu, 14 Nov 2013 12:28:41 -0800 (PST) Received: by 10.140.80.135 with HTTP; Thu, 14 Nov 2013 12:28:40 -0800 (PST) X-Originating-IP: [128.223.156.253] Date: Thu, 14 Nov 2013 12:28:40 -0800 Message-ID: From: David Meyer To: SDN IRTF list Content-Type: multipart/mixed; boundary=047d7bd765626dfac704eb28ed40 X-Mailman-Approved-At: Thu, 14 Nov 2013 12:30:10 -0800 Subject: [Sdn] Liaison received from the OIF X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 14 Nov 2013 20:28:49 -0000 --047d7bd765626dfac704eb28ed40 Content-Type: text/plain; charset=ISO-8859-1 ---------- Forwarded message ---------- From: Kimberly Chiu Date: Thu, Nov 14, 2013 at 10:03 AM Subject: Liaison from the OIF To: dmm@1-4-5.net, feamster@cc.gatech.edu Cc: ntracy@te.com, evelyne.roch@huawei.com, jonathan.sadler@tellabs.com Dear Mr. Meyer and Mr. Feamster, On behalf of Nathan Tracy, OIF Technical Committee chair, please see the attached liaison letter and the OIF Carrier WG Requirements on Transport Networks in SDN Architectures - Transport SDN document. Let me know if you have any questions. Kind regards, Kimberly Kimberly Chiu Optical Internetworking Forum (OIF) Project Manager 48377 Fremont Blvd, Ste 117 Fremont CA 94538 USA Phone: +1.510.492.4042 (direct) / +1.510.492.4040 (main) Fax: +1.510.492.4001 kchiu@oiforum.com www.oiforum.com --047d7bd765626dfac704eb28ed40 Content-Type: application/pdf; name="OIF_Carrier_WG_Requirements_on_Transport_Networks_in_SDN_Architectures_Sept2013.pdf" Content-Disposition: attachment; filename="OIF_Carrier_WG_Requirements_on_Transport_Networks_in_SDN_Architectures_Sept2013.pdf" Content-Transfer-Encoding: base64 X-Attachment-Id: b80d4034d3ce1f51_0.1 JVBERi0xLjQNJeLjz9MNCjI0MyAwIG9iag08PC9MaW5lYXJpemVkIDEvTCA2MTU1MTYvTyAyNDUv RSAyOTA5NzkvTiAyNS9UIDYxNDk2My9IIFsgNDk5IDU2OV0+Pg1lbmRvYmoNICAgICAgICAgICAg DQoyNTggMCBvYmoNPDwvRGVjb2RlUGFybXM8PC9Db2x1bW5zIDUvUHJlZGljdG9yIDEyPj4vRmls dGVyL0ZsYXRlRGVjb2RlL0lEWzxGOTc2ODE0NTUxQThFM0UxOTY4NjMzNDRCQzc3RkNBOT48Q0VG ODY2QUEwODEyMjM0RDk3MDYzOUMwNUI3MUMzQ0M+XS9JbmRleFsyNDMgMjldL0luZm8gMjQyIDAg 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dHhyZWYNCjExNg0KJSVFT0YNCg== --047d7bd765626dfac704eb28ed40-- From nordmark@acm.org Thu Nov 14 14:18:12 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 98C6711E8107 for ; Thu, 14 Nov 2013 14:18:12 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.599 X-Spam-Level: X-Spam-Status: No, score=-2.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 9Qe8UsG+A0uG for ; Thu, 14 Nov 2013 14:18:08 -0800 (PST) Received: from d.mail.sonic.net (d.mail.sonic.net [64.142.111.50]) by ietfa.amsl.com (Postfix) with ESMTP id 27EC311E80F2 for ; Thu, 14 Nov 2013 14:18:08 -0800 (PST) Received: from [172.22.251.17] ([162.210.130.4]) (authenticated bits=0) by d.mail.sonic.net (8.14.4/8.14.4) with ESMTP id rAEMHuKp027318 (version=TLSv1/SSLv3 cipher=DHE-RSA-CAMELLIA256-SHA bits=256 verify=NOT); Thu, 14 Nov 2013 14:17:57 -0800 Message-ID: <52854C13.3060000@acm.org> Date: Thu, 14 Nov 2013 14:17:55 -0800 From: Erik Nordmark User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:24.0) Gecko/20100101 Thunderbird/24.0.1 MIME-Version: 1.0 To: Yaakov Stein , Jamal Hadi Salim References: <00dc01cedee6$327f9730$977ec590$@riw.us> <012501cedeea$7f46c120$7dd44360$@riw.us> <2329b8e07d8444a2808de812c4ea0e2a@exrad6.ad.rad.co.il> <4680c2f6eabd4b3a9350cf7e5cdff6f8@exrad6.ad.rad.co.il> <52852D9A.8000508@sonic.net> In-Reply-To: <52852D9A.8000508@sonic.net> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Sonic-ID: C;svEvnXpN4xGw6o9G53gOpw== M;KjdKnXpN4xGw6o9G53gOpw== Cc: Russ White , David Meyer , "sdn@irtf.org" Subject: Re: [Sdn] Timeliness WAS(Re: Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 14 Nov 2013 22:18:12 -0000 Yaakov, Your note made me think about potential differences and similarities if we look at a single device (what we've classically done), and look at a network-wide view. In the device view I see two different behaviors: D1. Decision on the device - interface down, received routing update etc. The device makes a decision. We call that control plane. D2. Decision off the device - the device is instructed to do something (provision a vlan, admin disable a port) from some external entity. The device doesn't really care whether that entity is a human, a script, or some more capable controller. We've called that management plane. If we move up to a network view I see two similar, but network-level, behaviors: N1. The network (controller) makes a decision based on some event (a router failing, some information received from a router, etc). N2. The network (controller) is instructed to do something (configure a VPN from A to B) from some external entity. (Note that for both N1 and N2 the device is likely to see the outcome as D2 i.e., the device being instructed to do something without the device making any decisions.) I think that we are trying to use the terms we have for D1 and D2 in the network-level view, and that doesn't seem to fit well. Perhaps we need some new terms for N1 and N2? Erik On 11/12/13 11:02 PM, Yaakov Stein wrote: > No, a management plane operation doesn't become a control plane one just because it is faster. > > In general, control plane operations are faster because they are local rather than having to suffer a round-trip time, or because they are automatic rather than having a human in the loop. > > But there are exceptions. Configuring using a terminal directly plugged into a box is management plane, although it is very local. > > Control processes are automatic, triggered by events and timers, > and the logic behind them straightforward. > Management operations are initiated, and are directly motivated by high-level (business/mission related) concerns. > > Y(J)S > > > -----Original Message----- > From: Jamal Hadi Salim [mailto:hadi@mojatatu.com] > Sent: 12 November, 2013 21:55 > To: Yaakov Stein > Cc: Russ White; David Meyer; sdn@irtf.org > Subject: Re: [Sdn] Timeliness WAS(Re: Thoughts on Defining control and Management Planes > > Yaakov, > Thanks for the insight. > > So question: for lack of better wording, is the "accelaration" (or maybe it is > "velocity") towards consistency unimportant? > IOW, If i can update a 500K FIB table 100x faster with ForCES than with Netconf, does that not make them different? > > cheers, > jamal > > PS:- I am not here to judge merits of the two, i think they have their place. > If updating the tables was unimportant and usability is more important i would likely pick netconf. This is what we set out to do and i dont think the message is getting across. > > > > On Tue, Nov 12, 2013 at 1:20 PM, Yaakov Stein wrote: >> No, consistency and availability are quite different >> >> Consistency means that if you sent two packet in rapid succession, >> they would be handled in the same (and hopefully correct) way. >> >> Availability means that the packet is immediately handled, even if incorrectly. >> >> So, if in OF you start a new flow, the packet is not matched and so is sent to the controller. >> The flow now hangs until the controller receives the packet, figures out what to do with the flow, and configures all the match tables of all the switches. >> This is a lack of availability. >> From now on the packets belonging to the flow are all handled consistently. >> >> What happens if a link breaks ? >> In a well-engineered network protection switching immediately >> compensates, thus guaranteeing availability, even if the packets are now handled differently (lack of consistency). >> In a best-effort OSPF network, a link-down will cause the router >> before the break to immediately Dijkstra the next packet along a new path - also availability at the expense of consistency. The new path may even lead to black-holing - really inconsistent behavior. >> >> What happens if we need to send a packet belonging to a new flow to >> the controller and the controller (or a link to it) fails ? >> Then either we can wait until the controller CAN respond (unavailable) >> or decide to forward according to conventional (pre-SDN) methods (inconsistent). >> >> Y(J)S >> >> >> -----Original Message----- >> From: Jamal Hadi Salim [mailto:hadi@mojatatu.com] >> Sent: 12 November, 2013 13:31 >> To: Yaakov Stein >> Cc: Russ White; David Meyer; sdn@irtf.org >> Subject: Re: [Sdn] Timeliness WAS(Re: Thoughts on Defining control and >> Management Planes >> >> On Mon, Nov 11, 2013 at 12:48 PM, Yaakov Stein wrote: >>> No, we needn't put absolute times. >>> >> >> Ok, agreed. >> I was hoping there would be a good paper to what Dave Meyer pointed >> out >> here: >> http://cmg.soton.ac.uk/research/projects/separation-of-timescales-in-m >> odels-of-complex-networks/ >> >>> The times of importance are those that would signify unavailability for the particular application. >>> >>> Thus for interactive applications the times would be shorter than for progressive download ones. >>> >>> In the old days when voice was the only application, 100 ms was the >>> gold standard, and so protection switching was required to be mo more than 50 ms. >> >> I think what you say above may help me make the point. >> Can we equate "consistency" to what you refer to as "unavailability"? >> i.e. if i was able to update a FIB table at 10K/s then i would be able to reach consistency faster than if i did it at 1K/s Given that design intent of "management" interfaces was mostly targeted for human interaction both from usability as well as response tolerances - does automation change the fact that they are still constrained to that original design intent? I think not. >> Just because i can automate a CLI with expect does not magically change that it is slow (my tie to sense of urgency that offended Russ ;->). >> I can update tables a magnitude faster with OF than with netconf. Both are called SDN technologies. >> >> cheers, >> jamal > _______________________________________________ > sdn mailing list > sdn@irtf.org > https://www.irtf.org/mailman/listinfo/sdn > From yaakov_s@rad.com Sun Nov 17 03:49:08 2013 Return-Path: X-Original-To: sdn@ietfa.amsl.com Delivered-To: sdn@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4E59B11E8BA0 for ; Sun, 17 Nov 2013 03:49:08 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.442 X-Spam-Level: X-Spam-Status: No, score=-102.442 tagged_above=-999 required=5 tests=[AWL=0.155, BAYES_00=-2.599, UNPARSEABLE_RELAY=0.001, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id pEDzNrHtsrGQ for ; Sun, 17 Nov 2013 03:49:04 -0800 (PST) Received: from rad.co.il (mailrelay02-q.rad.co.il [94.188.133.159]) by ietfa.amsl.com (Postfix) with ESMTP id 9868911E8BAC for ; Sun, 17 Nov 2013 03:49:00 -0800 (PST) Received: from Internal Mail-Server by MailRelay02 (envelope-from yaakov?s@rad.com) with RC4-SHA encrypted SMTP; 17 Nov 2013 13:48:55 +0200 Received: from EXRAD6.ad.rad.co.il (2002:c072:18be::c072:18be) by exrad6.ad.rad.co.il (2002:c072:18be::c072:18be) with Microsoft SMTP Server (TLS) id 15.0.712.24; Sun, 17 Nov 2013 13:48:54 +0200 Received: from EXRAD6.ad.rad.co.il ([fe80::95ed:2d3a:ffd9:390a]) by exrad6.ad.rad.co.il ([fe80::95ed:2d3a:ffd9:390a%20]) with mapi id 15.00.0712.012; Sun, 17 Nov 2013 13:48:54 +0200 From: Yaakov Stein To: Erik Nordmark , Jamal Hadi Salim Thread-Topic: [Sdn] Timeliness WAS(Re: Thoughts on Defining control and Management Planes Thread-Index: AQHO35q+lgcM1MEOwUabIdZejEy86Zoh5j4g///7LICAANnYAIACTmkAgARH6RA= Date: Sun, 17 Nov 2013 11:48:53 +0000 Message-ID: References: <00dc01cedee6$327f9730$977ec590$@riw.us> <012501cedeea$7f46c120$7dd44360$@riw.us> <2329b8e07d8444a2808de812c4ea0e2a@exrad6.ad.rad.co.il> <4680c2f6eabd4b3a9350cf7e5cdff6f8@exrad6.ad.rad.co.il> <52852D9A.8000508@sonic.net> In-Reply-To: <52852D9A.8000508@sonic.net> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [172.17.140.37] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Commtouch-Refid: str=0001.0A090206.5288AD27.0070, ss=1, re=0.100, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0 (Unknown) Cc: Russ White , David Meyer , "sdn@irtf.org" Subject: Re: [Sdn] Timeliness WAS(Re: Thoughts on Defining control and Management Planes X-BeenThere: sdn@irtf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List to Discuss SDN Research Group in the IRTF List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 17 Nov 2013 11:49:08 -0000 Yes, "on-device" vs. "off-device" plays a big part,=20 but you need to properly define what you mean by a "device". Conventional switches are actually 2 devices: one dumb but fast one (the switch fabric) and one smart but slow one. So-called SDN switches only retain the first device, replacing the second by a centralized management plane configuring the firs= t one. The SDN crowd calls this "separating the data and control planes", while I call it removing the control plane and replacing its functionality = by a management plane. By the way, there is one thing the SDN academics got exactly right. As I said in a previous email, BFD or ping or Y.1731 is a single OAM functi= on for the entire data plane. On the other hand, each control plane function has its own instantiation wi= th its own OAM (keepalives) and other functionalities. This leads to the unfortunate consequence that control plane functionality = is not universal. For example, LDP invented a great extension to the concept of TLVs - the U = bit (which specifies whether one should silently ignore or notify upon rece= ipt of an Unknown message type). However, due to fragmentation of the control plane, this innovation never p= ropagated to other control protocols based on TLVs. What I think we should really learn from all this is not to insist on eradi= cating control planes entirely, but rather to start thinking about how we c= an unify the control plane.=20 Actually, 802 tried this once (when they invented GARP - the Generic Attrib= ute Registration Protocol) but it never took off. Y(J)S -----Original Message----- From: Erik Nordmark [mailto:nordmark@sonic.net]=20 Sent: 14 November, 2013 22:08 To: Yaakov Stein; Jamal Hadi Salim Cc: Russ White; David Meyer; sdn@irtf.org Subject: Re: [Sdn] Timeliness WAS(Re: Thoughts on Defining control and Mana= gement Planes Yaakov, Your note made me think about potential differences and similarities if we = look at a single device (what we've classically done), and look at a networ= k-wide view. In the device view I see two different behaviors: D1. Decision on the device - interface down, received routing update etc. T= he device makes a decision. We call that control plane. D2. Decision off the device - the device is instructed to do something (pro= vision a vlan, admin disable a port) from some external entity. The device = doesn't really care whether that entity is a human, a script, or some more = capable controller. We've called that management plane. If we move up to a network view I see two similar, but network-level, behaviors: N1. The network (controller) makes a decision based on some event (a router= failing, some information received from a router, etc). N2. The network (controller) is instructed to do something (configure a VPN= from A to B) from some external entity. (Note that for both N1 and N2 the device is likely to see the outcome as D2 i.e., the device being instructed to do something without the device mak= ing any decisions.) I think that we are trying to use the terms we have for D1 and D2 in the ne= twork-level view, and that doesn't seem to fit well. Perhaps we need some n= ew terms for N1 and N2? Erik On 11/12/13 11:02 PM, Yaakov Stein wrote: > No, a management plane operation doesn't become a control plane one just = because it is faster. > > In general, control plane operations are faster because they are local ra= ther than having to suffer a round-trip time, or because they are automatic= rather than having a human in the loop. > > But there are exceptions. Configuring using a terminal directly plugged i= nto a box is management plane, although it is very local. > > Control processes are automatic, triggered by events and timers, and=20 > the logic behind them straightforward. > Management operations are initiated, and are directly motivated by high-l= evel (business/mission related) concerns. > > Y(J)S > > > -----Original Message----- > From: Jamal Hadi Salim [mailto:hadi@mojatatu.com] > Sent: 12 November, 2013 21:55 > To: Yaakov Stein > Cc: Russ White; David Meyer; sdn@irtf.org > Subject: Re: [Sdn] Timeliness WAS(Re: Thoughts on Defining control and=20 > Management Planes > > Yaakov, > Thanks for the insight. > > So question: for lack of better wording, is the "accelaration" (or=20 > maybe it is > "velocity") towards consistency unimportant? > IOW, If i can update a 500K FIB table 100x faster with ForCES than with N= etconf, does that not make them different? > > cheers, > jamal > > PS:- I am not here to judge merits of the two, i think they have their pl= ace. > If updating the tables was unimportant and usability is more important i = would likely pick netconf. This is what we set out to do and i dont think t= he message is getting across. > > > > On Tue, Nov 12, 2013 at 1:20 PM, Yaakov Stein wrote: >> No, consistency and availability are quite different >> >> Consistency means that if you sent two packet in rapid succession,=20 >> they would be handled in the same (and hopefully correct) way. >> >> Availability means that the packet is immediately handled, even if incor= rectly. >> >> So, if in OF you start a new flow, the packet is not matched and so is s= ent to the controller. >> The flow now hangs until the controller receives the packet, figures out= what to do with the flow, and configures all the match tables of all the s= witches. >> This is a lack of availability. >> From now on the packets belonging to the flow are all handled consisten= tly. >> >> What happens if a link breaks ? >> In a well-engineered network protection switching immediately=20 >> compensates, thus guaranteeing availability, even if the packets are now= handled differently (lack of consistency). >> In a best-effort OSPF network, a link-down will cause the router=20 >> before the break to immediately Dijkstra the next packet along a new pat= h - also availability at the expense of consistency. The new path may even = lead to black-holing - really inconsistent behavior. >> >> What happens if we need to send a packet belonging to a new flow to=20 >> the controller and the controller (or a link to it) fails ? >> Then either we can wait until the controller CAN respond=20 >> (unavailable) or decide to forward according to conventional (pre-SDN) m= ethods (inconsistent). >> >> Y(J)S >> >> >> -----Original Message----- >> From: Jamal Hadi Salim [mailto:hadi@mojatatu.com] >> Sent: 12 November, 2013 13:31 >> To: Yaakov Stein >> Cc: Russ White; David Meyer; sdn@irtf.org >> Subject: Re: [Sdn] Timeliness WAS(Re: Thoughts on Defining control=20 >> and Management Planes >> >> On Mon, Nov 11, 2013 at 12:48 PM, Yaakov Stein wrote: >>> No, we needn't put absolute times. >>> >> >> Ok, agreed. >> I was hoping there would be a good paper to what Dave Meyer pointed=20 >> out >> here: >> http://cmg.soton.ac.uk/research/projects/separation-of-timescales-in- >> m >> odels-of-complex-networks/ >> >>> The times of importance are those that would signify unavailability for= the particular application. >>> >>> Thus for interactive applications the times would be shorter than for p= rogressive download ones. >>> >>> In the old days when voice was the only application, 100 ms was the=20 >>> gold standard, and so protection switching was required to be mo more t= han 50 ms. >> >> I think what you say above may help me make the point. >> Can we equate "consistency" to what you refer to as "unavailability"? >> i.e. if i was able to update a FIB table at 10K/s then i would be able t= o reach consistency faster than if i did it at 1K/s Given that design inten= t of "management" interfaces was mostly targeted for human interaction both= from usability as well as response tolerances - does automation change th= e fact that they are still constrained to that original design intent? I th= ink not. >> Just because i can automate a CLI with expect does not magically change = that it is slow (my tie to sense of urgency that offended Russ ;->). >> I can update tables a magnitude faster with OF than with netconf. Both a= re called SDN technologies. >> >> cheers, >> jamal > _______________________________________________ > sdn mailing list > sdn@irtf.org > https://www.irtf.org/mailman/listinfo/sdn >