From nobody Tue May 1 20:38:56 2018 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0A6CF12D0C3; Tue, 1 May 2018 20:38:56 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.999 X-Spam-Level: X-Spam-Status: No, score=-1.999 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id wsnUw7-mZISl; Tue, 1 May 2018 20:38:53 -0700 (PDT) Received: from mail-vk0-x235.google.com (mail-vk0-x235.google.com [IPv6:2607:f8b0:400c:c05::235]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 6D9C5127775; Tue, 1 May 2018 20:38:53 -0700 (PDT) Received: by mail-vk0-x235.google.com with SMTP id g72-v6so3728278vke.2; Tue, 01 May 2018 20:38:53 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=3gur/ancZZkCZs9wG6drWUtpXhRFrjHTZcylV3oaoO8=; b=JAQ/6FsRkY2piKWtLcsUc2WIyZTZ18LUow3lTx1pYGztnmGrqYVdwcxvU4g4SxYZKN 4i2DUrI2iDk1c5VS7PRGTcf0nOJV6q3wD0SeJb6I8vd8qG8RV9sdJiQgJVf2OBACgh3p ITWGxazcecN01bErlnbGHJF31yklEvNllgfpgZX5DiGNexgt119MU9ZuQp3g/9B83hKq LZyZDWXcjcF9+XnoaT9tC5KwEjbXGEuPvGoT2VSmeHzfMqLje+2TwKtO7tdhN57f7lER ZKyu9nYk0t/g0fA8z1XPM6aEOKtfnDr9YNLNHhN+4MP1UrpkylXFKATv4SCLeYgr2rar otvg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=3gur/ancZZkCZs9wG6drWUtpXhRFrjHTZcylV3oaoO8=; b=H01/pRJ7CvW357K+ip5BwrFOIDuCa9fb0n0wfa/HFiGnkQJ1sA0jg62cUfqQIMSOch JVR/UEeYEw49QQDO/8x318qA0sr2MM7Tfbza91SC5UQxCq0f7g4NTY7MHvGTZKdZhEDT P6i6dK17nxRPPIdh50YczSe3XzPCmZqEYjqmbqwEU5uTvaIoTR21wxuYyc7CHOPNNRPc mVWe73FXr1L39F651L/gi/NmGPvJ6qmBVRycYZ3W543/v/cYwL3CjnoT0lpDesbLa9yl iNVR6ommHDoS9BwfQD+0p6BnvW/svFk0Vd7v6jt865vWyMfS+Hxl7gxvh9y1zXskA7rM 51iw== X-Gm-Message-State: ALQs6tAxuED7JwgYJomZBMruPEodnz5RynHwpoiI8tW9qf+ek35cCqy7 sNPgVGwwfJBvdaob+Bu47bnQgLmoPo/oInMDewA= X-Google-Smtp-Source: AB8JxZrMRG6VqWxlE6dpLfr6eCfo2oici/FTEqkVcBMVN0kb742PVSWrgccb//YgkdIKncMuM4OHol1Qiqvh3K9oJbg= X-Received: by 2002:a1f:308b:: with SMTP id w133-v6mr16764384vkw.62.1525232332415; Tue, 01 May 2018 20:38:52 -0700 (PDT) MIME-Version: 1.0 Received: by 10.103.140.4 with HTTP; Tue, 1 May 2018 20:38:51 -0700 (PDT) In-Reply-To: <5AD5BEDF.1010603@cisco.com> References: <6C9DDF29-72D8-4630-82AD-342CC134EB36@cisco.com> <5ACF0C41.1090506@cisco.com> <2FF54200-BFCB-4492-BE21-441192D48BAE@cisco.com> <25B4902B1192E84696414485F572685413553D22@SJCEML521-MBB.china.huawei.com> <5AD5BEDF.1010603@cisco.com> From: Uma Chunduri Date: Tue, 1 May 2018 20:38:51 -0700 Message-ID: To: Peter Psenak Cc: Uma Chunduri , "Acee Lindem (acee)" , "lsr@ietf.org" , "draft-hegdeppsenak-isis-sr-flex-algo@ietf.org" Content-Type: multipart/alternative; boundary="0000000000005fa91e056b30d3fc" Archived-At: Subject: Re: [Lsr] Flex Algorithms Drafts X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 02 May 2018 03:38:56 -0000 --0000000000005fa91e056b30d3fc Content-Type: text/plain; charset="UTF-8" Hi Peter, Thanks for your response. See my questions below - On Tue, Apr 17, 2018 at 2:31 AM, Peter Psenak wrote: > Hi Uma, > > please see inline: > > > On 17/04/18 00:14 , Uma Chunduri wrote: > >> Dear All, >> I am neutral to combining the content of OSPF and IS-IS into a single >> draft. >> However, I have 2 questions on this draft. >> 1. >> 0 1 2 3 >> 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ >> | Type | Length | Algorithm | Metric Type | >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ >> | Alg. Type | Priority | >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ >> | Sub-TLVs | >> + + >> | ... | >> | | >> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ >> */ Algorithm: Flex-Algorithm number. Value between 128 and 255/* >> */ inclusive./* >> */ Algorithm Type: Single octet identifying the algorithm type used/* >> */ to compute paths for the Flex-Algoritm. Values are defined in/* >> */ "IGP Algorithm Types" registry defined under "Interior Gateway/* >> */ Protocol (IGP) Parameters" IANA registries./* >> Why there are two fields "Algorithm" and "Algorithm Type" ? >> > > these are being renamed in the next update to: > > Flex-Algorithm - Single octet value between 128 and 255 inclusive > 1. "Algorithm " as defined in the draft - I see is nothing but a light weight sub topology (with out MT ADJs) computed using an "Alg. Type". As of now - "Algorithm" type X is using "Alg.Type" Y to compute routes? After the change you mentioned, this would become "Algorithm" type X is using "Alg.Type" Y to compute routes? IMO, Overloading of the terms cause lot of confusion (and mis-understanding) down the line. This happened already in a different context for IS-IS; ask me how I will give clear example. I followed the other thread and agree with some of the points raised by Jie w.r.t what is being defined and what is being done. > > IGP Alg. Type - Single octet. Value between 0 and 127 inclusive, that > identifies IGP algorithm type used to compute paths for the Flex-Algoritm. > Values are defined in "IGP Algorithm Types" registry defined under > "Interior Gateway Protocol (IGP) Parameters" IANA registries > What are we saving here by overloading the terminology? --0000000000005fa91e056b30d3fc Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Peter,

Thanks for your response. See= my questions below -

On Tue, Apr 17, 2018 at 2:31 AM, Peter Psenak <= ;ppsenak@cisco.com> wrote:
Hi Uma,

please see inline:


On 17/04/18 00:14 , Uma Chunduri wrote:
Dear All,
I am neutral to combining the content of OSPF and IS-IS into a single
draft.
However, I have 2 questions on this draft.
1.
=C2=A0 =C2=A00=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A01=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A02=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A03
=C2=A0 =C2=A0 =C2=A00 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7= 8 9 0 1
=C2=A0 =C2=A0 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-= +-+-+-+-+
=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 Type=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 = Length=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0Algorithm=C2=A0 =C2=A0|=C2=A0 Metri= c Type=C2=A0 |
=C2=A0 =C2=A0 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-= +-+-+-+-+
=C2=A0 =C2=A0 |=C2=A0 =C2=A0Alg. Type=C2=A0 =C2=A0|=C2=A0 =C2=A0 Priority= =C2=A0 =C2=A0|
=C2=A0 =C2=A0 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-= +-+-+-+-+
=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Sub-TLVs=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|
=C2=A0 =C2=A0 +=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0+
=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 ...=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 |
=C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0|
=C2=A0 =C2=A0 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-= +-+-+-+-+
 */=C2=A0 =C2=A0 =C2=A0 =C2=A0Algorithm: Flex-Algorithm number.=C2=A0 Value = between 128 and 255/*
*/=C2=A0 =C2=A0 =C2=A0 inclusive./*
*/=C2=A0 =C2=A0 =C2=A0 Algorithm Type: Single octet identifying the algorit= hm type used/*
*/=C2=A0 =C2=A0 =C2=A0 to compute paths for the Flex-Algoritm.=C2=A0 Values= are defined in/*
*/=C2=A0 =C2=A0 =C2=A0 "IGP Algorithm Types" registry defined und= er "Interior Gateway/*
*/=C2=A0 =C2=A0 =C2=A0 Protocol (IGP) Parameters" IANA registries./*
Why there are two fields "Algorithm" and "Algorithm Type&quo= t; ?

these are being renamed in the next update to:

Flex-Algorithm - Single octet value between 128 and 255 inclusive

1.=C2=A0
"Algorithm "=C2=A0 = as defined in the draft -=C2=A0 I see is nothing but a light weight sub top= ology (with out MT ADJs)=C2=A0 computed using an "Alg. Type".

As of now -

"Algorithm&= quot; type X is using "Alg.Type" Y to compute=C2=A0 routes?=C2=A0=

After the change you mentioned, this would become=


"Algorithm" type X is using "Alg.T= ype" Y to compute=C2=A0 routes?=C2=A0

IMO, Overloading of the terms cause lot of=C2= =A0 confusion (and mis-understanding) down the line. This happened already = in a different context for IS-IS; ask me how I will give clear example.

I followed the other thread and agree with some of th= e points raised by Jie w.r.t what is being defined and what is being done.<= /div>




IGP Alg. Type - Single octet. Value between 0 and 127 inclusive, that
identifies IGP algorithm type used to compute paths for the Flex-Algoritm. = Values are defined in "IGP Algorithm Types" registry defined unde= r "Interior Gateway Protocol (IGP) Parameters" IANA registries

What are we = saving here by overloading the terminology?=C2=A0

=
--0000000000005fa91e056b30d3fc-- From nobody Tue May 1 21:06:50 2018 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id BC825127444; Tue, 1 May 2018 21:06:48 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.999 X-Spam-Level: X-Spam-Status: No, score=-1.999 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id H0gxu5sY6ikl; Tue, 1 May 2018 21:06:46 -0700 (PDT) Received: from mail-ua0-x241.google.com (mail-ua0-x241.google.com [IPv6:2607:f8b0:400c:c08::241]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 2A914127775; Tue, 1 May 2018 21:06:38 -0700 (PDT) Received: by mail-ua0-x241.google.com with SMTP id i3so8593725uad.4; Tue, 01 May 2018 21:06:38 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=RTN527g7Vk08U8y337spm/ekhiFufCHzrdGXtKdIKKA=; b=dP/gt2SiXOAYPYOk7+tkMd+4I8PIJ+03e8G/z5+9xsrkBjVs/kfCnHhDM6IMdCvdKm ISAYtREUtPMvFqUl2rSqfd6jYEoXuGBLnjuidKi2crlRYhGSqf3DZCOZH9Uo5DEtSpvW 0sVcT8fc+LHs2oXDJiJW7MDAI7eNTQIbOsoEvIdLPMME0KP98lENZa29kfqH1bFaRmT4 D8JahSoeCklFc1BBE2/eDhcAP9KD+ycQtew5eSRFbf3/sWij84A7SFZlkSplrUsCTj7E XYIP2gkTAqzUffHyRqALgyjim6tr5JgesHxalM1kk4q3coW2G3C2WtgKv8htB0CzukGE QKoQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=RTN527g7Vk08U8y337spm/ekhiFufCHzrdGXtKdIKKA=; b=NauU5gIRi77mAn+uWshvadA/zu6n5ubT+6q5hhwdD799xrcmeHIgAkKWRSV4mwtvs0 qv8CuIFH4Jxlh7bVw3IKBzC9WUMwxUw31qzA55sHZZQCnH18860OFsns/mDVEig3d0YR 46hyySUAs5Z2FrzK3E2d2N05Wpf/R6cVRqxmUYDVvDyHoQTUJO7PSyvikpDg3ivBQ4Kh n7hzEH/n1rE6AB4KY0xHKqBTt3A4xylSp5zn7pm4+ChYI17exPa88zRZVGZI+k3NvWV5 oquODPed6Om9zMq5R+Rn0qRRRfq4TIIeuUStmKckeXtIjtfzQNe/ZlMuqmJMbyaPJT1U NzDA== X-Gm-Message-State: ALQs6tClkfLfKxuHHMx6WDpvxXWHua5iGQa4lmv1/alI+NX9FnR3/Z0x BMvRioB6CS+QJgeS0VLn6VCa5N+iaJED1Idapjs= X-Google-Smtp-Source: AB8JxZrIITJLsMvJL6qM18WEIMEq4J3kgVvV0oinTPltWKUdrvkmYskrBdQGYL6FuYeRZ317bW9/6Z3+39JAyMi4Rbc= X-Received: by 10.159.40.35 with SMTP id c32mr17614526uac.193.1525233997338; Tue, 01 May 2018 21:06:37 -0700 (PDT) MIME-Version: 1.0 Received: by 10.103.140.4 with HTTP; Tue, 1 May 2018 21:06:36 -0700 (PDT) In-Reply-To: <5AD5BEDF.1010603@cisco.com> References: <6C9DDF29-72D8-4630-82AD-342CC134EB36@cisco.com> <5ACF0C41.1090506@cisco.com> <2FF54200-BFCB-4492-BE21-441192D48BAE@cisco.com> <25B4902B1192E84696414485F572685413553D22@SJCEML521-MBB.china.huawei.com> <5AD5BEDF.1010603@cisco.com> From: Uma Chunduri Date: Tue, 1 May 2018 21:06:36 -0700 Message-ID: To: Peter Psenak Cc: Uma Chunduri , "Acee Lindem (acee)" , "lsr@ietf.org" , "draft-hegdeppsenak-isis-sr-flex-algo@ietf.org" Content-Type: multipart/alternative; boundary="94eb2c048be09c5baa056b31369d" Archived-At: Subject: Re: [Lsr] Flex Algorithms Drafts X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 02 May 2018 04:06:49 -0000 --94eb2c048be09c5baa056b31369d Content-Type: text/plain; charset="UTF-8" > > > these are being renamed in the next update to: > > Flex-Algorithm - Single octet value between 128 and 255 inclusive > > > IGP Alg. Type - Single octet. Value between 0 and 127 inclusive, that > identifies IGP algorithm type used to compute paths for the Flex-Algoritm. > Values are defined in "IGP Algorithm Types" registry defined under > "Interior Gateway Protocol (IGP) Parameters" IANA registries Hi Peter, The above change would conflict https://www.iana.org/assignments/igp-parameters/igp-parameters.xhtml (where it is defined till 255) and cause changes to https://tools.ietf.org/html/draft-ietf-ospf-segment-routing-extensions-25 (Which is in RFC Editor queue) https://datatracker.ietf.org/doc/draft-ietf-isis-segment-routing-extensions/ (In WG LC) Are we going in that direction? I still see "Flex-Algorithm" is light-weight sub-topology with constrains and still computed using one of the Algorithms as specified in https://www.iana.org/assignments/igp-parameters/igp-parameters.xhtml. Kindly avoid confusion around the terminology here, plz - Thx! -- Uma C. --94eb2c048be09c5baa056b31369d Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

these are being renamed in the next update to:

Flex-Algorithm - Single octet value between 128 and 255 inclusive


IGP Alg. Type - Single octet. Value between 0 and 127 inclusive, that
identifies IGP algorithm type used to compute paths for the Flex-Algoritm. = Values are defined in "IGP Algorithm Types" registry defined unde= r "Interior Gateway Protocol (IGP) Parameters" IANA registries

Hi Peter,


cause changes to=C2=A0




Are we= going in that direction?

I still see "Flex-A= lgorithm" is light-weight sub-topology with constrains and still compu= ted using one of the Algorithms as specified in=C2=A0 https://www.iana.org/assignments/igp-parame= ters/igp-parameters.xhtml.
<= br>
Kindly avoid confusion around the terminology here, pl= z -

Thx!

--
Uma C.
=C2=A0

=C2=A0
--94eb2c048be09c5baa056b31369d-- From nobody Wed May 2 01:04:53 2018 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id CEDC6126C2F; Wed, 2 May 2018 01:04:51 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -14.511 X-Spam-Level: X-Spam-Status: No, score=-14.511 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_HI=-5, SPF_PASS=-0.001, T_DKIMWL_WL_MED=-0.01, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id vJoXQyClwmrR; Wed, 2 May 2018 01:04:45 -0700 (PDT) Received: from aer-iport-4.cisco.com (aer-iport-4.cisco.com [173.38.203.54]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id B71B3126BFD; Wed, 2 May 2018 01:04:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=1445; q=dns/txt; s=iport; t=1525248285; x=1526457885; h=message-id:date:from:mime-version:to:cc:subject: references:in-reply-to:content-transfer-encoding; bh=rgsKDlcOlyEfCOuQQOG4pbxL3LSzpbgK3d/tTM1eIO0=; b=XLVSl36G4Nhbgn5LO1MqMhJ+jg5CWg4sruUetHxYyqu4H/84uDUdkvU3 G3vwnA4dguS1DFdQiMGrlpGg8TrrJwRW04XzKgyYqlLlcDK+NiEhOZogh hfCWPJRQC1IgSazy1k+bshRCKV2Ei/fEAchybS34HiMHoJD+9RPi4eBK1 o=; X-IronPort-AV: E=Sophos;i="5.49,354,1520899200"; d="scan'208";a="3509016" Received: from aer-iport-nat.cisco.com (HELO aer-core-3.cisco.com) ([173.38.203.22]) by aer-iport-4.cisco.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 02 May 2018 08:04:43 +0000 Received: from [10.60.140.57] (ams-ppsenak-nitro8.cisco.com [10.60.140.57]) by aer-core-3.cisco.com (8.14.5/8.14.5) with ESMTP id w4284gnk028497; Wed, 2 May 2018 08:04:42 GMT Message-ID: <5AE9711A.4060804@cisco.com> Date: Wed, 02 May 2018 10:04:42 +0200 From: Peter Psenak User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:24.0) Gecko/20100101 Thunderbird/24.4.0 MIME-Version: 1.0 To: Uma Chunduri CC: Uma Chunduri , "Acee Lindem (acee)" , "lsr@ietf.org" , "draft-hegdeppsenak-isis-sr-flex-algo@ietf.org" References: <6C9DDF29-72D8-4630-82AD-342CC134EB36@cisco.com> <5ACF0C41.1090506@cisco.com> <2FF54200-BFCB-4492-BE21-441192D48BAE@cisco.com> <25B4902B1192E84696414485F572685413553D22@SJCEML521-MBB.china.huawei.com> <5AD5BEDF.1010603@cisco.com> In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Archived-At: Subject: Re: [Lsr] Flex Algorithms Drafts X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 02 May 2018 08:04:52 -0000 Uma, On 02/05/18 06:06 , Uma Chunduri wrote: > > these are being renamed in the next update to: > > Flex-Algorithm - Single octet value between 128 and 255 inclusive > > > IGP Alg. Type - Single octet. Value between 0 and 127 inclusive, that > identifies IGP algorithm type used to compute paths for the > Flex-Algoritm. Values are defined in "IGP Algorithm Types" registry > defined under "Interior Gateway Protocol (IGP) Parameters" IANA > registries > > > Hi Peter, > > The above change would conflict > https://www.iana.org/assignments/igp-parameters/igp-parameters.xhtml > (where it is defined till 255) and how does it conflict? What we are saying is that a field contains value from the registry and we limit the values that it can use from such registry. I see no conflict. Peter > > cause changes to > > https://tools.ietf.org/html/draft-ietf-ospf-segment-routing-extensions-25 (Which > is in RFC Editor queue) > > https://datatracker.ietf.org/doc/draft-ietf-isis-segment-routing-extensions/ > (In WG LC) > > > Are we going in that direction? > > I still see "Flex-Algorithm" is light-weight sub-topology with > constrains and still computed using one of the Algorithms as specified > in https://www.iana.org/assignments/igp-parameters/igp-parameters.xhtml. > > Kindly avoid confusion around the terminology here, plz - > > Thx! > > -- > Uma C. > > From nobody Thu May 3 10:19:56 2018 Return-Path: X-Original-To: lsr@ietf.org Delivered-To: lsr@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 9D81212EA76; Thu, 3 May 2018 10:19:54 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit From: Ben Niven-Jenkins To: Cc: lsr@ietf.org, draft-ietf-ospf-xaf-te.all@ietf.org, rtg-ads@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.79.1 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <152536799456.4442.2733959917314042989@ietfa.amsl.com> Date: Thu, 03 May 2018 10:19:54 -0700 Archived-At: Subject: [Lsr] Rtgdir last call review of draft-ietf-ospf-xaf-te-02 X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.22 List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 03 May 2018 17:19:55 -0000 Reviewer: Ben Niven-Jenkins Review result: Has Nits Hello, I have been selected as the Routing Directorate reviewer for this draft. The Routing Directorate seeks to review all routing or routing-related drafts as they pass through IETF last call and IESG review, and sometimes on special request. The purpose of the review is to provide assistance to the Routing ADs. For more information about the Routing Directorate, please see ​http://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir Although these comments are primarily for the use of the Routing ADs, it would be helpful if you could consider them along with any other IETF Last Call comments that you receive, and strive to resolve them through discussion or by updating the draft. Document: draft-ietf-ospf-xaf-te-02.txt Reviewer: Ben Niven-Jenkins Review Date: 3 May 2018 Intended Status: Standards Track Summary: This document is basically ready for publication, but has nits that should be considered prior to publication. Comments: The document is readable and succinctly addresses the use case outlined. Minor issues: Section 3, paragraph 4 states: If the Node Attribute TLV carries both the Node IPv4 Local Address sub-TLV and the Node IPv6 Local Address sub-TLV, then the X-AF component must be considered for the consolidated calculation of MPLS TE LSPs. Is the lowercase must supposed to be an uppercase MUST? Nits: Section 4, paragraph 1 states: Way of using these TLVs as specified in this document is fully backward compatible with previous standard documents. This does not read quite right to me. Maybe you should consider rewording it to something like the text I suggest below. Also when you say “standard documents” do you mean RFCs? Is it worth citing an example for completeness? The way these TLVs are used, as specified in this document, is fully backward compatible with earlier RFCs. Regards Ben From nobody Thu May 3 12:10:34 2018 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1160E12D967; Thu, 3 May 2018 12:10:33 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.199 X-Spam-Level: X-Spam-Status: No, score=-4.199 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 8N6IqxCkFbNh; Thu, 3 May 2018 12:10:31 -0700 (PDT) Received: from huawei.com (lhrrgout.huawei.com [194.213.3.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id AF05E12DA06; Thu, 3 May 2018 12:10:30 -0700 (PDT) Received: from lhreml703-cah.china.huawei.com (unknown [172.18.7.108]) by Forcepoint Email with ESMTP id 77E12B5A2F836; Thu, 3 May 2018 20:10:26 +0100 (IST) Received: from SJCEML702-CHM.china.huawei.com (10.208.112.38) by lhreml703-cah.china.huawei.com (10.201.108.44) with Microsoft SMTP Server (TLS) id 14.3.382.0; Thu, 3 May 2018 20:10:28 +0100 Received: from SJCEML521-MBX.china.huawei.com ([169.254.1.34]) by SJCEML702-CHM.china.huawei.com ([169.254.4.62]) with mapi id 14.03.0382.000; Thu, 3 May 2018 12:10:24 -0700 From: Alvaro Retana To: Ben Niven-Jenkins , rtg-dir CC: lsr , draft-ietf-ospf-xaf-te.all , rtg-ads Thread-Topic: Rtgdir last call review of draft-ietf-ospf-xaf-te-02 Thread-Index: AQHT4wL6AxRaMfddskKbjLrpJGOix6QeXsCj Date: Thu, 3 May 2018 19:10:23 +0000 Message-ID: <29C261AADAA83847826BD136C22FC8880120C333@sjceml521-mbx.china.huawei.com> References: <152536799456.4442.2733959917314042989@ietfa.amsl.com> In-Reply-To: <152536799456.4442.2733959917314042989@ietfa.amsl.com> 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AB8JxZoPdVvVclrzBbkoStJHkkA/nFzVlyepG0vZIvktoNwXOiwYN6MhP/2mscWuVzyPR0Jtn4ogfLXs26F5Xh5vDR8= X-Received: by 2002:a6b:20c3:: with SMTP id g186-v6mr36033833iog.172.1525632272893; Sun, 06 May 2018 11:44:32 -0700 (PDT) MIME-Version: 1.0 References: <65EF563D-0E36-4D13-9565-14FED79F8531@cisco.com> <5ACB8D5E.9050403@cisco.com> <25B4902B1192E84696414485F5726854135521C2@SJCEML521-MBB.china.huawei.com> In-Reply-To: <25B4902B1192E84696414485F5726854135521C2@SJCEML521-MBB.china.huawei.com> From: Sam Aldrin Date: Sun, 06 May 2018 18:44:22 +0000 Message-ID: To: Uma Chunduri Cc: Peter Psenak , "Acee Lindem (acee)" , draft-ietf-ospf-segment-routing-msd@ietf.org, lsr@ietf.org Content-Type: multipart/alternative; boundary="000000000000af0dae056b8df154" Archived-At: Subject: Re: [Lsr] LSR WG IPR Query for "Signaling MSD (Maximum SID Depth) using OSPF" - draft-ietf-ospf-segment-routing-msd-10.txt (one more @#$ time) X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 06 May 2018 18:44:35 -0000 --000000000000af0dae056b8df154 Content-Type: text/plain; charset="UTF-8" I am not aware of IPR related to this. Sam On Mon, Apr 9, 2018, 10:47 AM Uma Chunduri wrote: > I am not aware of any other IPRs related to this document other than > what's been already disclosed. > > > -- > Uma C. > > > On 06/04/18 03:27 , Acee Lindem (acee) wrote: > > Authors, > > > > Are you aware of any IPR that applies to > > draft-ietf-ospf-segment-routing-msd-10.txt? > > > > If so, has this IPR been disclosed in compliance with IETF IPR rules > > (see RFCs 3979, 4879, 3669 and 5378 for more details). > > > > If you are listed as a document author or contributor please respond > > to this email regardless of whether or not you are aware of any > > relevant IPR. *The response needs to be sent to the LSR WG mailing > > list.* The document will not advance to the next stage until a > > response has been received from each author and contributor. > > > > If you are on the LSR WG email list but are not listed as an author or > > contributor, then please explicitly respond only if you are aware of > > any IPR that has not yet been disclosed in conformance with IETF rules. > > > > Thanks, > > > > Acee > > > > --000000000000af0dae056b8df154 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
I am not aware of IPR related to this.
<= br>
Sam

On Mon, Apr 9, 2018, 10:47 AM Uma Chunduri <uma.chunduri@huawei.com> wrote:
I am not aware of any other IPRs related = to this document other than what's been already disclosed.


--
Uma C.


On 06/04/18 03:27 , Acee Lindem (acee) wrote:
> Authors,
>
> Are you aware of any IPR that applies to
> draft-ietf-ospf-segment-routing-msd-10.txt?
>
> If so, has this IPR been disclosed in compliance with IETF IPR rules > (see RFCs 3979, 4879, 3669 and 5378 for more details).
>
> If you are listed as a document author or contributor please respond > to this email regardless of whether or not you are aware of any
> relevant IPR. *The response needs to be sent to the LSR WG mailing
> list.* The document will not advance to the next stage until a
> response has been received from each author and contributor.
>
> If you are on the LSR WG email list but are not listed as an author or=
> contributor, then please explicitly respond only if you are aware of > any IPR that has not yet been disclosed in conformance with IETF rules= .
>
> Thanks,
>
> Acee
>

--000000000000af0dae056b8df154-- From nobody Mon May 7 16:17:06 2018 Return-Path: X-Original-To: lsr@ietf.org Delivered-To: lsr@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id F2CAA12D7F5; Mon, 7 May 2018 16:16:59 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: lsr@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.79.1 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <152573501994.20261.3518952187842413792@ietfa.amsl.com> Date: Mon, 07 May 2018 16:16:59 -0700 Archived-At: Subject: [Lsr] I-D Action: draft-ietf-ospf-segment-routing-msd-11.txt X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.22 List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 07 May 2018 23:17:00 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Link State Routing WG of the IETF. Title : Signaling MSD (Maximum SID Depth) using OSPF Authors : Jeff Tantsura Uma Chunduri Sam Aldrin Peter Psenak Filename : draft-ietf-ospf-segment-routing-msd-11.txt Pages : 9 Date : 2018-05-07 Abstract: This document defines a way for an OSPF Router to advertise multiple types of supported Maximum SID Depths (MSDs) at node and/or link granularity. Such advertisements allow entities (e.g., centralized controllers) to determine whether a particular SID stack can be supported in a given network. This document defines only one type of MSD, but defines an encoding that can support other MSD types. Here the term OSPF means both OSPFv2 and OSPFv3. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-ospf-segment-routing-msd/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-ospf-segment-routing-msd-11 https://datatracker.ietf.org/doc/html/draft-ietf-ospf-segment-routing-msd-11 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-ospf-segment-routing-msd-11 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ From nobody Mon May 7 16:21:38 2018 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 49F1F12D7F5; Mon, 7 May 2018 16:21:30 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.698 X-Spam-Level: X-Spam-Status: No, score=-2.698 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, MIME_QP_LONG_LINE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 9u3qT5u-kjqh; Mon, 7 May 2018 16:21:25 -0700 (PDT) Received: from mail-yw0-x22e.google.com (mail-yw0-x22e.google.com [IPv6:2607:f8b0:4002:c05::22e]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 52DC812426E; Mon, 7 May 2018 16:21:25 -0700 (PDT) Received: by mail-yw0-x22e.google.com with SMTP id i17-v6so9124192ywg.13; Mon, 07 May 2018 16:21:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=user-agent:date:subject:from:to:cc:message-id:thread-topic :references:in-reply-to:mime-version; bh=jwSos9skVqfH4cpowIr2gqteRyDGea8PPEXpOFvTC4w=; b=pBkmRKMO9DYSvt4VHUvXrzxg3SiNqXirtXSpwdPbUO09oksOhKnOiCSsyzapJnr8aG q6vjkHlcXBe3qOfmsahXXwQ8wdBSaeSugm44EKL+nQViMD/NuW+vSaziwSy6FrWRKQjM LmpNAgBILq0vhxZLekAUW8S0d7I3d9vZnI62Le6KqRSC6Qps16/ANcO/6nNEOf5OX/s7 lpxsW2HFrnu7jut4rVTDXGj3TB/BkStcfJAD9D2FuTQkNyUoJhxpLghoooji3ql2z8Z2 hgdBBIBcACH2wQOVS3b9Edwh7bBcXjTnJ/OJ9S/ScX1HixtJDWcNOQE3+3uUgD0cnAep WcWg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:user-agent:date:subject:from:to:cc:message-id :thread-topic:references:in-reply-to:mime-version; bh=jwSos9skVqfH4cpowIr2gqteRyDGea8PPEXpOFvTC4w=; b=fmedhxSwQIB5i8h7ElALmTMQ/vWgwsoAcZSzY6qbs9ZJFGKtUSDgpQc0y3XX8Yezvg ndMJiXozNIKl042Q+XI/Rz0Ui6oZKovulEPQTUbfFBvUq148nxhP323c9OkMnbsga7JO bLuB4dT/CRp1AS+XZj1WA5zO57N8bZfniEaRbAHHHfnbRDkXcvJlu2YLjJT6wNKEZoZ3 lJuv0gVyW76o7YDslDGesUvKH29ByUq9xwzwls5cePeMSAkhAWTQaH3Td6ayQlP1bQIO kLV0PEOu/sAF8nOiMeMTCIPWeigp2T+kGQ6euQm5RSATtXVE4yyFFJJMi1ZXOKqb2q8o dDkw== X-Gm-Message-State: ALKqPwc1qMYnnTfevT3NfZH4pFilh3oekiF+zV6Dng/HdM2G+fyByQeO oS2xANFzOADYrPd+yPSsUo2noA== X-Google-Smtp-Source: AB8JxZp5TrNeWLq1foSmhixX2o0EK97w6IJwSjwbMri6Zkry0MU5Ps1V5sQHnqevhXo3lQ0sIkwgTA== X-Received: by 2002:a81:6282:: with SMTP id w124-v6mr4401659ywb.58.1525735284566; Mon, 07 May 2018 16:21:24 -0700 (PDT) Received: from [51.11.5.190] ([66.201.62.254]) by smtp.gmail.com with ESMTPSA id w10-v6sm7752699ywj.81.2018.05.07.16.21.22 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 07 May 2018 16:21:23 -0700 (PDT) User-Agent: Microsoft-MacOutlook/10.c.0.180410 Date: Mon, 07 May 2018 16:21:22 -0700 From: Jeff Tantsura To: Tal Mizrahi , , , CC: , Message-ID: <0BD74779-D765-49B0-BD89-4B6420C4AF96@gmail.com> Thread-Topic: RtgDir Early review: draft-ietf-ospf-segment-routing-msd.txt References: In-Reply-To: Mime-version: 1.0 Content-type: multipart/alternative; boundary="B_3608554883_1633977602" Archived-At: Subject: Re: [Lsr] RtgDir Early review: draft-ietf-ospf-segment-routing-msd.txt X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 07 May 2018 23:21:30 -0000 > This message is in MIME format. Since your mail reader does not understand this format, some or all of this message may not be legible. --B_3608554883_1633977602 Content-type: text/plain; charset="UTF-8" Content-transfer-encoding: quoted-printable Hi Tal, =20 New version (11) should address all your comments. Many thanks and please let me know, if there=E2=80=99s anything else. =20 Cheers, Jeff From: Tal Mizrahi Date: Sunday, April 29, 2018 at 04:08 To: , ,= Cc: , Subject: Re: RtgDir Early review: draft-ietf-ospf-segment-routing-msd.txt Resent-From: Resent-To: Jeff Tantsura , , , Resent-Date: Sun, 29 Apr 2018 04:08:12 -0700 (PDT) =20 + LSR mailing list. =20 Cheers, Tal. =20 On Sun, Apr 29, 2018 at 2:04 PM, Tal Mizrahi wr= ote: Hello I have been selected to do a routing directorate =E2=80=9Cearly=E2=80=9D review of this= draft.=20 =E2=80=8Bhttps://datatracker.ietf.org/doc/draft-ietf-ospf-segment-routing-msd/ The routing directorate will, on request from the working group chair, perf= orm an =E2=80=9Cearly=E2=80=9D review of a draft before it is submitted for publication = to the IESG. The early review can be performed at any time during the draft=E2= =80=99s lifetime as a working group document.=20 For more information about the Routing Directorate, please see =E2=80=8Bhttp://tr= ac.tools.ietf.org/area/rtg/trac/wiki/RtgDir Document: draft-ietf-ospf-segment-routing-msd.txt=20 Reviewer: Tal Mizrahi Review Date: April 2018=20 Intended Status: Standards Track Summary:=20 This document is basically ready for publication, but has a couple of issue= s and a few nits that should be considered prior to being submitted to the I= ESG. Comments: The Security Considerations should be more detailed. The reference to RFC 7= 770 is a good start, but please add more details about potential attacks. Fo= r example, what happens if there is a spoofed MSD with a low MSD value? What= is the impact of such an attack? Section 3: The description of the Length field says =E2=80=9Cminimum of 2=E2=80=9D, implying it ca= n be higher than 2. On the other hand, the Value field: =E2=80=9Cconsists of a 1 octet sub-type (IANA= Registry) and 1 octet value.=E2=80=9D, which implies that the Length is equal to = 2. Please align the two descriptions, i.e., if flexibility for future sub-type= s is required, please change the description of Value to allow longer values= . The comment applies to Section 4 as well. Nits: The term =E2=80=9Cminimum MSD=E2=80=9D, which translates to =E2=80=9Cminimum maximum SID Dept= h=E2=80=9D should be explained. The term =E2=80=9Cmaximum MSD=E2=80=9D appears twice in the document, which seems eithe= r redundant, or a typo (did you mean minimum MSD?). The acronym SID should be spelled out on its first use. The acronyms RI and LSA should be added to the Terminology subsection. Section 1.1.1 and Section 2 are both titled =E2=80=9CTerminology=E2=80=9D. It would be = best to merge Section 1.1 into Section 2, and avoid the duplicate title. =E2=80=9Ceach node/link a given SR path=E2=80=9D -> =E2=80=9Ceach node/link of a given SR pat= h=E2=80=9D =E2=80=9Cnodes and links which has been configured=E2=80=9D -> =E2=80=9Cnodes and links that = have been configured=E2=80=9D =E2=80=9Claso=E2=80=9D->=E2=80=9Dalso=E2=80=9D =E2=80=9COther Sub-types other than defined=E2=80=9D -> =E2=80=9CSub-types other than defined= =E2=80=9D =20 =20 Cheers, Tal Mizrahi. =20 --B_3608554883_1633977602 Content-type: text/html; charset="UTF-8" Content-transfer-encoding: quoted-printable

Hi Tal,

&nbs= p;

New version (11) should address all your comm= ents.

Many thanks and please let me know, i= f there=E2=80=99s anything else.

 

Cheers,

Jeff<= /o:p>

From: Tal Mizrahi = <tal.mizrahi.phd@gmail.com>
Date: Sunday, April 29, 2018 at = 04:08
To: <draft-ietf-ospf-segment-routing-msd@ietf.org>, &l= t;ospf-chairs@ietf.org>, <lsr@ietf.org>
Cc: <rtg-dir@i= etf.org>, <rtg-ads@ietf.org>
Subject: Re: RtgDir Early re= view: draft-ietf-ospf-segment-routing-msd.txt
Resent-From: <ali= as-bounces@ietf.org>
Resent-To: Jeff Tantsura <jefftant.ietf= @gmail.com>, <uma.chunduri@huawei.com>, <aldrin.ietf@gmail.com&g= t;, <ppsenak@cisco.com>
Resent-Date: Sun, 29 Apr 2018 04:08:= 12 -0700 (PDT)

 = ;

+ LSR m= ailing list.

 

Cheers,=

Tal.

 

On Sun, Apr 29, 2018 at 2:0= 4 PM, Tal Mizrahi <tal.mizrahi.phd@gma= il.com> wrote:

Hello

I have been selected to do a= routing directorate =E2=80=9Cearly=E2=80=9D review of this draft. 
=E2=80=8Bhttps://datatracker.ietf.org/doc/draft-ietf-ospf-segment-routing-ms= d/

<= span style=3D'font-size:10.0pt;font-family:"Verdana",sans-serif;color:black'>T= he routing directorate will, on request from the working group chair, perfor= m an =E2=80=9Cearly=E2=80=9D review of a draft before it is submitted for publication to= the IESG. The early review can be performed at any time during the draft=E2=80=99= s lifetime as a working group document.

For more information about the Routi= ng Directorate, please see =E2=80=8B<= span style=3D'font-size:10.0pt;font-family:"Verdana",sans-serif;color:#BB0000'= >http://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir

Document: draft-ietf-ospf-segment-routing-msd.= txt 
Reviewer: Tal Mizrahi
Review Date: April 2018 
Inten= ded Status: Standards Track

Summary: 
This document is basically ready f= or publication, but has a couple of issues and a few nits that should be con= sidered prior to being submitted to the IESG.

= Comments:

  • The Se= curity Considerations should be more detailed. The reference to RFC 7770 is = a good start, but please add more details about potential attacks. For examp= le, what happens if there is a spoofed MSD with a low MSD value? What is the= impact of such an attack?
  • Sectio= n 3:
      • The description of the = Length field says =E2=80=9Cminimum of 2=E2=80=9D, implying it can be higher than 2.
        O= n the other hand, the Value field: =E2=80=9Cconsists of a 1 octet sub-type (IANA R= egistry) and 1 octet value.=E2=80=9D, which implies that the Length is equal to 2.=
        Please align the two descriptions, i.e., if flexibility for future sub-t= ypes is required, please change the description of Value to allow longer val= ues.
      • The comment applies to Secti= on 4 as well.

    Nits:

    • The term =E2=80=9Cminimum MSD=E2=80=9D, whic= h translates to =E2=80=9Cminimum maximum SID Depth=E2=80=9D should be explained.<= /span>
      • The term =E2=80=9Cmaximum MSD=E2=80=9D appears twice= in the document, which seems either redundant, or a typo (did you mean mini= mum MSD?).
    • The acronym SID should= be spelled out on its first use.
    • The acronyms RI and LSA should be added to the Terminology subsection.
    • Section 1.1.1 and Section 2 are both = titled =E2=80=9CTerminology=E2=80=9D. It would be best to merge Section 1.1 into Section= 2, and avoid the duplicate title.
    • =E2=80=9Ceach node/link a given SR path=E2=80=9D -> =E2=80=9Ceach node/link of a given SR= path=E2=80=9D
    • =E2=80=9Cnodes and links which= has been configured=E2=80=9D -> =E2=80=9Cnodes and links that have been configured=E2=80= =9D
    • =E2=80=9Claso=E2=80=9D->=E2=80=9Dalso=E2=80=9D
      • =
    • =E2=80=9COther Sub-types other than defined=E2= =80=9D -> =E2=80=9CSub-types other than defined=E2=80=9D

     

    <= /div>

    &n= bsp;

    Cheers,

    Tal Mizrahi.

    =

     

    --B_3608554883_1633977602-- From nobody Mon May 7 16:23:04 2018 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8C8B412D7F5 for ; Mon, 7 May 2018 16:23:03 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.698 X-Spam-Level: X-Spam-Status: No, score=-2.698 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, MIME_QP_LONG_LINE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ELDV9SbQMLxl for ; Mon, 7 May 2018 16:23:00 -0700 (PDT) Received: from mail-yw0-x22d.google.com (mail-yw0-x22d.google.com [IPv6:2607:f8b0:4002:c05::22d]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 3C27D12426E for ; Mon, 7 May 2018 16:23:00 -0700 (PDT) Received: by mail-yw0-x22d.google.com with SMTP id g9-v6so9130043ywb.12 for ; Mon, 07 May 2018 16:23:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=user-agent:date:subject:from:to:message-id:thread-topic :mime-version; bh=AYT4c1I1Es71Bwj8Kpm0ZBTBdT/EkJhKlB8AmQ3P3yI=; b=M4DXxAieE3tsCLVsJ/YP57u8G7pL1zdKPl2DXVHq6nAMz/o3sAPpbZzMvZEkvV3uiz 99gKs69dECoTHVRs7m4+x6LrHM8kuRwhhwcIoo7VvXYTF9LClDw+lmn046juBGYLolZ7 RMkbUvJNDGsgp1fNsD2JYHDV/z5QcjMvP8YKx9JscPSPUFsvBal7y7q4v/TzqhTprvAT QINbdHk22aj5o/7pcV6D9lKmtQYMb+Q7SRDeUKGsM328GUFZVim2nYsGFp2tkiQXyoym vAwhwm6x3efErJi68sGU5AnjXznnnoKWh4tQhIdmgxHJaGtsRt4t5o+mCNJWqHmx57/Q vkIA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:user-agent:date:subject:from:to:message-id :thread-topic:mime-version; bh=AYT4c1I1Es71Bwj8Kpm0ZBTBdT/EkJhKlB8AmQ3P3yI=; b=gC11/oEqEs8NmhPt34o5V9KfJeAC28HNDqkmaq7xpAw697J/F2ED25CJUNZvOlUZC0 5jlEeTlY84m/VynqJ54/UHUid5feUn7tuADrHDEsZzFhxPJYaAvsvGbKCGOPkmHk6vqY S/NMG7XmIDGgUOSxC25wyIq5IpfY32R1PDHmMZ5C0HbFXvwWbAXXBBs1oMosMEdG3q9F kAOC5/XLnwC0zGBxBl3K98HfyHHz8kFGerpyxJw+VYrxoDahK3/KyfmlPWyl8g1LP/Lp ETxeLNWXgK994ljyct2YHENuVbYrjJ/hjwlY3EGWfsRoRtQHxhKs7ZSksvf2qGLgB23J Ub5A== X-Gm-Message-State: ALQs6tC2PW6dtxpkDtIgCXJlo8d+kOE4vVXSOOIEox9slVWVPfvYgkmD xvTZhIg/+YA1Fypiws6m51hXDA== X-Google-Smtp-Source: AB8JxZqygVBtk5epumDgCJt8L4v3gjZhIhZaYCBg4RsMYOXUB+2LCwuAUM3wUQSKoFz/E/r2HuE8nw== X-Received: by 2002:a81:2a57:: with SMTP id q84-v6mr4150548ywq.149.1525735379401; Mon, 07 May 2018 16:22:59 -0700 (PDT) Received: from [51.11.5.190] ([66.201.62.254]) by smtp.gmail.com with ESMTPSA id w10-v6sm7752699ywj.81.2018.05.07.16.22.58 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 07 May 2018 16:22:58 -0700 (PDT) User-Agent: Microsoft-MacOutlook/10.c.0.180410 Date: Mon, 07 May 2018 16:22:58 -0700 From: Jeff Tantsura To: "Ketan Talaulikar (ketant)" , "Acee Lindem (acee)" , "lsr@ietf.org" Message-ID: <52ECD01B-B6A9-4812-B715-7BD1FC07FC91@gmail.com> Thread-Topic: [Lsr] LSR WG Last Call for "Signaling MSD (Maximum SID Depth) using OSPF" - draft-ietf-ospf-segment-routing-msd-10.txt Mime-version: 1.0 Content-type: multipart/alternative; boundary="B_3608554978_2013219663" Archived-At: Subject: Re: [Lsr] LSR WG Last Call for "Signaling MSD (Maximum SID Depth) using OSPF" - draft-ietf-ospf-segment-routing-msd-10.txt X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 07 May 2018 23:23:03 -0000 > This message is in MIME format. Since your mail reader does not understand this format, some or all of this message may not be legible. --B_3608554978_2013219663 Content-type: text/plain; charset="UTF-8" Content-transfer-encoding: quoted-printable Hi Ketan, =20 New version (11) should address all your comments, please check and let me = know. ISIS version is being aligned as we speak. =20 Many thanks! =20 Cheers, Jeff From: Lsr on behalf of "Ketan Talaulikar (ketant)" <= ketant@cisco.com> Date: Thursday, April 12, 2018 at 05:04 To: "Acee Lindem (acee)" , "lsr@ietf.org" Subject: Re: [Lsr] LSR WG Last Call for "Signaling MSD (Maximum SID Depth) = using OSPF" - draft-ietf-ospf-segment-routing-msd-10.txt =20 Hi Acee, =20 I have reviewed this draft for OSPF but in the same context also gone over = its corresponding ISIS draft (https://datatracker.ietf.org/doc/draft-ietf-is= is-segment-routing-msd/ ) and some of the comments apply to both since they = are mostly identical in content. =20 I need to ask the question if it makes sense to merge these drafts into a s= ingle one to save everyone cycles and ensure consistency in the spirit of LS= R J =20 General Qs: There are some differences between the ISIS and OSPF versions of this draft= . Could I request the authors to please cross-check and fix? The ISIS draft = does not have some of the issues mentioned below. Do these TLVs apply only when the router is enabled for Segment Routing? i.= e. they should be originated when SR is enabled on the router and the receiv= er should not expect them when SR is disabled? Or do we foresee MSD to be mo= re generic. This aspect needs to be clarified. The allowable values are specified as 0-254 in OSPF draft while ISIS one al= lows 255 as well. The IANA section though says that 255 is reserved. The draft using =E2=80=9Csub-type=E2=80=9D in some places and =E2=80=9Ctype=E2=80=9D in some places= . This is confusing. The ISIS draft uses =E2=80=9Ctype=E2=80=9D everywhere which seems b= etter. Several comments below about the section where OSPF TLVs are defined and I = would suggest to use similar text as in the ISIS draft. I think it is better that the draft mandates that the MSD sub-types SHOULD= be encoded in ascending order? This makes it easier for the receiver/consum= er to detect absence or removal of a specific sub-type from signalling. Reference to RFC4970 should be replaced with RFC7770 Both the ISIS and OSPF drafts are asking IANA for creation of MSD type regi= stry. Should the creation not be done by only one of them and the other poin= ts to it? =20 =20 Sec 1 =20 can be imposed at each node/link on a given SR path =20 It laso also defines the Base MPLS Imposition MSD type. =20 Sec 1.1.1 =20 BMI: Base MPLS Imposition is the number of MPLS labels that can be imposed inclusive of any all service/transport/special labels =20 Sec 3 =20 Node MSD is the minimum MSD supported by all the links of the node. =20 Sub-Type 1 (IANA Section), MSD and the Value field contains maximum MSD of the router originating the RI LSA. =20 =20 Some Qs on Sec 3: In my understanding, the Node MSD is the minimum value of all the Link MSDs= for the links on that node that are enabled in that specific IGP instance. = There may be another IGP instance configured on the same node with a differe= nt set of links and for that instance, the Node MSD may be higher. The same = goes for links that are not configured/enabled under the specific IGP instan= ce. The draft needs to clarify this aspect. The draft needs to specify how many instances of this TLV are allowed in th= e RI LSA and when there are multiple instances in the same or multiple RI LS= A fragments, then how should the receiver handle or interpret them? E.g. use= s the minimum of the signalled Node MSD values or uses the first instance of= the TLV in the lowest fragment, etc. Also, we don=E2=80=99t want multiple instanc= es of the MSD TLV to be encoded for different types =E2=80=93 all of them must be = in a single instance of the MSD TLV. =20 Sec 4 =20 For OSPFv3, the Link level MSD value is advertised as an optional Sub-TLV of the Router-Link E-Router-LSA TLV as defined in [I-D.ietf-ospf-ospfv3-lsa-extend], and has value of TBD3. =20 Sub-Type 1 (IANA Section), MSD and the Value field contains Link MSD of the link router originating the corresponding LSA as specified for OSPFv2 and OSPFv3. =20 Some Qs on Sec 4: The draft needs to specify how many instances of this TLV are allowed in th= e Extended Link Attribute/E-Router LSA and when there are multiple instances= then how should the receiver handle or interpret them? Also, we don=E2=80=99t wan= t multiple instances of the MSD TLV to be encoded for different types =E2=80=93 al= l of them must be in a single instance of the MSD TLV. =20 =20 Sec 5 =20 Suggest to add =E2=80=9CWhen a Link MSD type is not signalled but the Node MSD ty= pe is, then the value of that Link MSD type MUST considered as the correspon= ding Node MSD type value.=E2=80=9D I realize this is obvious but it is better to b= e clarified. This enables routes with homogenous link MSD values to advertis= e just the Node MSD values. I also think this should be RECOMMENDED by the d= raft for flooding efficiencies. =20 Sec 6 =20 The Base MPLS Imposition MSD (BMI-MSD) signals the total number of MPLS labels a node is capable of imposing, including any all service/ Transport/special labels. =20 Sec 8 =20 I think the security section just points to the RI LSA draft, but it also n= eeds to cover the other LSAs. IMHO the security considerations are fairly ge= neric for the protocols but we need the right references here? =20 Thanks, Ketan =20 From: Lsr On Behalf Of Acee Lindem (acee) Sent: 06 April 2018 06:19 To: lsr@ietf.org Subject: [Lsr] LSR WG Last Call for "Signaling MSD (Maximum SID Depth) usin= g OSPF" - draft-ietf-ospf-segment-routing-msd-10.txt =20 This begins an LSR WG last call for the subject draft. Please send your comments to this list prior to 12:00 AM GMT, April 20th, 2018.=20 =20 Thanks, Acee and Chris =20 _______________________________________________ Lsr mailing list Lsr@ietf.o= rg https://www.ietf.org/mailman/listinfo/lsr=20 --B_3608554978_2013219663 Content-type: text/html; charset="UTF-8" Content-transfer-encoding: quoted-printable

    Hi Ketan,

    &= nbsp;

    New = version (11) should address all your comments, please check and let me know.=

    ISIS= version is being aligned as we speak.

     

    Many thanks!

     

    Cheers,<= /o:p>

    Jeff

    From: Lsr <lsr-bounces@ietf.org> on behalf of "Ketan T= alaulikar (ketant)" <ketant@cisco.com>
    Date: Thursday, = April 12, 2018 at 05:04
    To: "Acee Lindem (acee)" <ace= e@cisco.com>, "lsr@ietf.org" <lsr@ietf.org>
    Subject= : Re: [Lsr] LSR WG Last Call for "Signaling MSD (Maximum SID Depth)= using OSPF" - draft-ietf-ospf-segment-routing-msd-10.txt

    &n= bsp;

    Hi Acee,

     

    I have reviewed this draft for OSPF but in the sam= e context also gone over its corresponding ISIS draft (htt= ps://datatracker.ietf.org/doc/draft-ietf-isis-segment-routing-msd/ )= and some of the comments apply to both since they are mostly identical in c= ontent.

     <= /span>

    I need to ask t= he question if it makes sense to merge these drafts into a single one to sav= e everyone cycles and ensure consistency in the spirit of LSR = J

     

    General Qs:

    1. There are some differences between the ISI= S and OSPF versions of this draft. Could I request the authors to please cro= ss-check and fix? The ISIS draft does not have some of the issues mentioned = below.
    2. Do these TLVs apply only wh= en the router is enabled for Segment Routing? i.e. they should be originated= when SR is enabled on the router and the receiver should not expect them wh= en SR is disabled? Or do we foresee MSD to be more generic. This aspect need= s to be clarified.
    3. The allowable v= alues are specified as 0-254 in OSPF draft while ISIS one allows 255 as well= . The IANA section though says that 255 is reserved.
    4. The draft using =E2=80=9Csub-type=E2=80=9D in some places and =E2=80=9Ctype= =E2=80=9D in some places. This is confusing. The ISIS draft uses =E2=80=9Ctype=E2=80=9D everyw= here which seems better.
    5. Several c= omments below about the section where OSPF TLVs are defined and I would sugg= est to use similar text as in the ISIS draft.
      6. <= li class=3DMsoListParagraph style=3D'margin-left:0in;mso-list:l0 level1 lfo2'>I think it is better that the draft mandates that the  MSD = sub-types SHOULD be encoded in ascending order? This makes it easier for the= receiver/consumer to detect absence or removal of a specific sub-type from = signalling.
    6. Reference to RFC4970 s= hould be replaced with RFC7770
    7. Bot= h the ISIS and OSPF drafts are asking IANA for creation of MSD type registry= . Should the creation not be done by only one of them and the other points t= o it?

    &nb= sp;

     

    Sec 1

     

    can be imposed at each node/link on a given SR path
     
    It laso also defi=
nes
       the Base MPLS Imposition MSD =
type.
     

    Sec 1.1.1

     

       BMI=
: Base MPLS Imposition is the number of MPLS labels that can be<=
/o:p>
       imposed inclusive of any all se=
rvice/transport/special labels

     

    Sec 3

     

    Node MSD is the minimum MSD suppo=
rted by all the links of the node.
    &nbs= p;
    Sub-Type 1 (IANA Section), MSD and the Valu=
e field contains maximum
       MSD of t=
he router originating the RI LSA.
    =
 =
;

     

    Some Qs on Sec 3:

    1. In my understanding, the Node MSD is the minimum value of all the Link= MSDs for the links on that node that are enabled in that specific IGP insta= nce. There may be another IGP instance configured on the same node with a di= fferent set of links and for that instance, the Node MSD may be higher. The = same goes for links that are not configured/enabled under the specific IGP i= nstance. The draft needs to clarify this aspect.
    2. The draft needs to specify how many instances of this TLV are= allowed in the RI LSA and when there are multiple instances in the same or = multiple RI LSA fragments, then how should the receiver handle or interpret = them? E.g. uses the minimum of the signalled Node MSD values or uses the fir= st instance of the TLV in the lowest fragment, etc. Also, we don=E2=80=99t want mu= ltiple instances of the MSD TLV to be encoded for different types =E2=80=93 all of= them must be in a single instance of the MSD TLV.<= /li>

     

    Sec 4

     

       For=
 OSPFv3, the Link level MSD value is advertised as an optional
       Sub-TLV of the Router-Link E-Router-=
LSA TLV as defined in
       [I-D.ietf-ospf-ospfv3-lsa-extend], and has value of TBD3.

     

    <= pre>&= nbsp;  Sub-Type 1 (IANA Section), MSD and the Value field contains Link= MSD
       of the link router origin=
ating the corresponding LSA as specified for
       OSPFv2 and OSPFv3.
     <=
o:p>
    Some Qs on Sec 4:
    1. The draft needs to specify how many instances of this TLV are allowed in =
the Extended Link Attribute/E-Router LSA and when there are multiple instanc=
es then how should the receiver handle or interpret them? Also, we don=E2=80=99t w=
ant multiple instances of the MSD TLV to be encoded for different types =E2=80=93 =
all of them must be in a single instance of the MSD TLV.
     
     
    <=
p class=3DMsoNormal>Sec 5
     
    Suggest to add =E2=80=9CWhen a Link MSD type is not signalled but the Node MSD type is, the=
n the value of that Link MSD type MUST considered as the corresponding Node =
MSD type value.=
=E2=80=9D I realize this is obvious but it is better to be clarified. This enables=
 routes with homogenous link MSD values to advertise just the Node MSD value=
s. I also think this should be RECOMMENDED by the draft for flooding efficie=
ncies.
     
    Sec 6
     
    <=
pre>&=
nbsp;  The Base MPLS Imposition MSD (BMI-MSD) signals the total number =
of
       MPLS labels a node is capable =
of imposing, including any all service/
       Transport/special labels.
     
    Sec=
 8
     
    I think the security section just points to the RI LSA=
 draft, but it also needs to cover the other LSAs. IMHO the security conside=
rations are fairly generic for the protocols but we need the right reference=
s here?
     
    Thanks,
    Ketan
     
    From: Lsr <lsr-bounces@ietf.o=
rg> On Behalf Of Acee Lindem (acee)
    Sent: 06 April 2018 =
06:19
    To: lsr@ietf.org
    Subject: [Lsr] LSR WG Last Call f=
or "Signaling MSD (Maximum SID Depth) using OSPF" - draft-ietf-osp=
f-segment-routing-msd-10.txt

     

    This begins an LSR WG last call for = the subject draft. Please send your

    comments to this list prior to 12:00 AM GMT, April 20th, = 2018.

     

    Thanks,<= /o:p>

    Acee and Chris

     

    _______________________________________________ Lsr mailing list = Lsr@ietf.org https://www.ietf.org/mailman/listinfo/lsr

    --B_3608554978_2013219663-- From nobody Tue May 8 02:41:00 2018 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 30645120227; Tue, 8 May 2018 02:40:59 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.698 X-Spam-Level: X-Spam-Status: No, score=-2.698 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id dcjfUb5P1eVn; Tue, 8 May 2018 02:40:56 -0700 (PDT) Received: from mail-wm0-x234.google.com (mail-wm0-x234.google.com [IPv6:2a00:1450:400c:c09::234]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 4693312D7E5; Tue, 8 May 2018 02:40:56 -0700 (PDT) Received: by mail-wm0-x234.google.com with SMTP id t11so17750845wmt.0; Tue, 08 May 2018 02:40:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=uQoBEhmmsip8F1CKzDyRvNBv9uBoc7U0SbRrk3BfVzE=; b=enx5RSqVNG/79YjirT+mi/2ICKspZO93/vt51A+BiJL7zOgnK4C/7zGMlVGcZwZ7j0 L40YXeYHxYGlsFsZtWycQoWkRWwCUu04jYWBu5e6wokCvQuBCfSXsLwPNSzYSPd2yR2a +Sk36uY2bAbqigXH1GHYoDd3/0Rx8rchMAG7K2ry4nSJHVXE4okTo44v5Nga8ajGhChy ix+04S9GSXXRvSrx4mqvnkN6kJ4meMAAc14iaM+mZ8D/19yrVbm3+74W8dgtV9BQimjR +vGTAliAm/zkqEzp5irRvSn76alKBEkb+oTmk4Ol+Ih3a2QEBlDs5BO7p2Pb3Yi80weW AB+w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=uQoBEhmmsip8F1CKzDyRvNBv9uBoc7U0SbRrk3BfVzE=; b=bgGE3DJ+VbYlMLWTjII2kaejdGctsyqWhXA+nTNJe802KV+XW/essbL3XPjTYNfZTM I4ir6/m3NHteDH2Z2NuuACzI9opqrfoSwOzXClpwnPJ5x4LTygaDVfrWX97D8vsPpQUZ kg/D9WABZROgUbyNmMC5h21zbXrmypDnZFyXjq0ZS2JI2Jazg+Dy8pYRP8o1MnV/AA5a dpbdBlwP6O3nuVEF/YL1rFEBk+piZBL2j51o4S4xvWAB9o7tlH2/2Asan8/pa8znN6c2 5T6l+t/0d+2sbixDKOQj/Utz7/71SPCLXIe0mvlHOfgDpGtW9SZUUPwhL7u+Jxc1A40k kzsw== X-Gm-Message-State: ALQs6tARy/ZUbbjKnq00CzEWKFzddyrTDNMFnsV8UtoPJ60jLCkf3B8s zvrVJpZRkZA2NY5ApqDlo+Ps5yAyB+JNrKeiSWI= X-Google-Smtp-Source: AB8JxZrzxuxR2JSypVlhmpmFu1wlVNN9qiIvNkGsQisf4fTxKEiN09W5ONTsZcLl8P15n6D7vbbSWllpj1LhsbLcShc= X-Received: by 2002:a50:8fa5:: with SMTP id y34-v6mr54130244edy.290.1525772454736; Tue, 08 May 2018 02:40:54 -0700 (PDT) MIME-Version: 1.0 Received: by 10.80.169.227 with HTTP; Tue, 8 May 2018 02:40:54 -0700 (PDT) In-Reply-To: <0BD74779-D765-49B0-BD89-4B6420C4AF96@gmail.com> References: <0BD74779-D765-49B0-BD89-4B6420C4AF96@gmail.com> From: Tal Mizrahi Date: Tue, 8 May 2018 12:40:54 +0300 Message-ID: To: Jeff Tantsura Cc: draft-ietf-ospf-segment-routing-msd@ietf.org, ospf-chairs@ietf.org, lsr@ietf.org, rtg-dir@ietf.org, rtg-ads@ietf.org Content-Type: multipart/alternative; boundary="0000000000002c3519056bae953b" Archived-At: Subject: Re: [Lsr] RtgDir Early review: draft-ietf-ospf-segment-routing-msd.txt X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 08 May 2018 09:40:59 -0000 --0000000000002c3519056bae953b Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Jeff, The new version resolves the comments I had. Thanks for the effort. Cheers, Tal. On Tue, May 8, 2018 at 2:21 AM, Jeff Tantsura wrote: > Hi Tal, > > > > New version (11) should address all your comments. > > Many thanks and please let me know, if there=E2=80=99s anything else. > > > > Cheers, > > Jeff > > *From: *Tal Mizrahi > *Date: *Sunday, April 29, 2018 at 04:08 > *To: *, < > ospf-chairs@ietf.org>, > *Cc: *, > *Subject: *Re: RtgDir Early review: draft-ietf-ospf-segment- > routing-msd.txt > *Resent-From: * > *Resent-To: *Jeff Tantsura , < > uma.chunduri@huawei.com>, , > *Resent-Date: *Sun, 29 Apr 2018 04:08:12 -0700 (PDT) > > > > + LSR mailing list. > > > > Cheers, > > Tal. > > > > On Sun, Apr 29, 2018 at 2:04 PM, Tal Mizrahi > wrote: > > Hello > > I have been selected to do a routing directorate =E2=80=9Cearly=E2=80=9D = review of this > draft. > =E2=80=8Bhttps://datatracker.ietf.org/doc/draft-ietf-ospf-segment-routing= -msd/ > > The routing directorate will, on request from the working group chair, > perform an =E2=80=9Cearly=E2=80=9D review of a draft before it is submitt= ed for publication > to the IESG. The early review can be performed at any time during the > draft=E2=80=99s lifetime as a working group document. > > For more information about the Routing Directorate, please see =E2=80=8B > http://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir > > Document: draft-ietf-ospf-segment-routing-msd.txt > Reviewer: Tal Mizrahi > Review Date: April 2018 > Intended Status: Standards Track > > *Summary:* > This document is basically ready for publication, but has a couple of > issues and a few nits that should be considered prior to being submitted = to > the IESG. > > *Comments:* > > - The Security Considerations should be more detailed. The reference > to RFC 7770 is a good start, but please add more details about potenti= al > attacks. For example, what happens if there is a spoofed MSD with a lo= w MSD > value? What is the impact of such an attack? > - Section 3: > > > - The description of the Length field says =E2=80=9Cminimum of 2=E2=80= =9D, implying it > can be higher than 2. > On the other hand, the Value field: =E2=80=9Cconsists of a 1 octet = sub-type > (IANA Registry) and 1 octet value.=E2=80=9D, which implies that the= Length is equal > to 2. > Please align the two descriptions, i.e., if flexibility for future > sub-types is required, please change the description of Value to al= low > longer values. > - The comment applies to Section 4 as well. > > *Nits:* > > - The term =E2=80=9Cminimum MSD=E2=80=9D, which translates to =E2=80= =9Cminimum maximum SID > Depth=E2=80=9D should be explained. > - The term =E2=80=9Cmaximum MSD=E2=80=9D appears twice in the document= , which seems > either redundant, or a typo (did you mean minimum MSD?). > - The acronym SID should be spelled out on its first use. > - The acronyms RI and LSA should be added to the Terminology > subsection. > - Section 1.1.1 and Section 2 are both titled =E2=80=9CTerminology=E2= =80=9D. It would > be best to merge Section 1.1 into Section 2, and avoid the duplicate t= itle. > - =E2=80=9Ceach node/link a given SR path=E2=80=9D -> =E2=80=9Ceach no= de/link of a given SR > path=E2=80=9D > - =E2=80=9Cnodes and links which has been configured=E2=80=9D -> =E2= =80=9Cnodes and links that > have been configured=E2=80=9D > - =E2=80=9Claso=E2=80=9D->=E2=80=9Dalso=E2=80=9D > - =E2=80=9COther Sub-types other than defined=E2=80=9D -> =E2=80=9CSub= -types other than > defined=E2=80=9D > > > > > > Cheers, > > Tal Mizrahi. > > > --0000000000002c3519056bae953b Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
    Hi Jeff,

    The new version resolves the c= omments I had. Thanks for the effort.

    Cheers,
    Tal.


    On Tue, May 8, 2018 at 2:21 AM, Jeff Tantsura <j= efftant.ietf@gmail.com> wrote:

    Hi Tal,

    =C2=A0

    New= version (11) should address all your comments.

    Many thanks and please let me know, if there=E2=80=99s anyth= ing else.

    =C2=A0

    <= div>

    Cheers,

    Jeff

    <= div class=3D"h5">

    =C2=A0

    =

    + LSR mailing list.

    <= span>=C2=A0

    Cheers,

    Ta= l.

    = =C2=A0

    On Sun, Apr 29, 2= 018 at 2:04 PM, Tal Mizrahi <tal.mizrahi.phd@gmail.com> wrote:

    Hello

    I have been selected to do a routin= g directorate =E2=80=9Cearly=E2=80=9D review of this draft.=C2=A0
    =E2=80=8Bhttps://datatracker.ietf.org/doc/draft-ietf-ospf-= segment-routing-msd/<= /span>

    The routing direc= torate will, on request from the working group chair, perform an =E2=80=9Ce= arly=E2=80=9D review of a draft before it is submitted for publication to t= he IESG. The early review can be performed at any time during the draft=E2= =80=99s lifetime as a working group document.

    For more information about the Routing Directorate, please see=C2=A0=E2=80=8Bhttp://trac.tools.ietf.org/area/rtg/trac/wik= i/RtgDir

    Document: draft-ietf-= ospf-segment-routing-msd.txt=C2=A0
    Reviewer: Tal Mizrahi
    Review = Date: April 2018=C2=A0
    Intended Status: Standards Track

    <= strong>Summary:=C2= =A0
    This document is basically ready for publication, but has a couple o= f issues and a few nits that should be considered prior to being submitted = to the IESG.

    Comments:=

    • The Security Considerations should be more detailed. The referen= ce to RFC 7770 is a good start, but please add more details about potential= attacks. For example, what happens if there is a spoofed MSD with a low MS= D value? What is the impact of such an attack?
    • Section 3:
    • = The description of the Length field says =E2=80=9Cminimum of 2=E2=80= =9D, implying it can be higher than 2.
      On the other hand, the Value fiel= d: =E2=80=9Cconsists of a 1 octet sub-type (IANA Registry) and 1 octet valu= e.=E2=80=9D, which implies that the Length is equal to 2.
      Please align t= he two descriptions, i.e., if flexibility for future sub-types is required,= please change the description of Value to allow longer values.
    • The comment applies to Section 4 as well.

    Nits:

    • The term = =E2=80=9Cminimum MSD=E2=80=9D, which translates to =E2=80=9Cminimum maximum= SID Depth=E2=80=9D should be explained.<= /span>
    • <= span>The term =E2=80=9Cmaximum MSD=E2=80=9D appears twice in the document,= which seems either redundant, or a typo (did you mean minimum MSD?).
    • The acronym SID should be spelled out on= its first use.
    • The acronyms RI and= LSA should be added to the Terminology subsection.<= /u>
    • Section 1.1.1 and Section 2 are both titled =E2=80=9CTermi= nology=E2=80=9D. It would be best to merge Section 1.1 into Section 2, and = avoid the duplicate title.
      • =E2=80= =9Ceach node/link a given SR path=E2=80=9D -> =E2=80=9Ceach node/link of= a given SR path=E2=80=9D
    • =E2=80=9C= nodes and links which has been configured=E2=80=9D -> =E2=80=9Cnodes and= links that have been configured=E2=80=9D=
    • = =E2=80=9Claso=E2=80=9D->=E2=80=9Dalso=E2=80=9D
    • =E2=80=9COther Sub-types other than defined=E2=80=9D = -> =E2=80=9CSub-types other than defined=E2=80=9D=

    =C2=A0=

    =C2=A0

    Cheers,

    =

    Tal Mizrahi.

    =C2=A0=


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Thu, 10 May 2018 07:56:31 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: lsr@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.80.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <152596419185.10425.3276066232183361644@ietfa.amsl.com> Date: Thu, 10 May 2018 07:56:31 -0700 Archived-At: Subject: [Lsr] I-D Action: draft-ietf-ospf-segment-routing-msd-12.txt X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.22 List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 10 May 2018 14:56:32 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Link State Routing WG of the IETF. Title : Signaling MSD (Maximum SID Depth) using OSPF Authors : Jeff Tantsura Uma Chunduri Sam Aldrin Peter Psenak Filename : draft-ietf-ospf-segment-routing-msd-12.txt Pages : 10 Date : 2018-05-10 Abstract: This document defines a way for an OSPF Router to advertise multiple types of supported Maximum SID Depths (MSDs) at node and/or link granularity. Such advertisements allow entities (e.g., centralized controllers) to determine whether a particular SID stack can be supported in a given network. This document defines only one type of MSD, but defines an encoding that can support other MSD types. Here the term OSPF means both OSPFv2 and OSPFv3. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-ospf-segment-routing-msd/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-ospf-segment-routing-msd-12 https://datatracker.ietf.org/doc/html/draft-ietf-ospf-segment-routing-msd-12 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-ospf-segment-routing-msd-12 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ From nobody Thu May 10 08:06:01 2018 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8661612EB47 for ; Thu, 10 May 2018 08:06:00 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -14.509 X-Spam-Level: X-Spam-Status: No, score=-14.509 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-5, SPF_PASS=-0.001, T_DKIMWL_WL_HIGH=-0.01, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id t-W8EskZL984 for ; Thu, 10 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([173.36.7.18]) with mapi id 15.00.1320.000; Thu, 10 May 2018 10:05:45 -0500 From: "Ketan Talaulikar (ketant)" To: Jeff Tantsura , "Acee Lindem (acee)" , "lsr@ietf.org" Thread-Topic: [Lsr] LSR WG Last Call for "Signaling MSD (Maximum SID Depth) using OSPF" - draft-ietf-ospf-segment-routing-msd-10.txt Thread-Index: AQHT5lpZfO6CONgtz0Wi7cqqNKWVZaQpE8cQ Date: Thu, 10 May 2018 15:05:44 +0000 Message-ID: <4702346c243f403e90271535efac7bff@XCH-ALN-008.cisco.com> References: <52ECD01B-B6A9-4812-B715-7BD1FC07FC91@gmail.com> In-Reply-To: <52ECD01B-B6A9-4812-B715-7BD1FC07FC91@gmail.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.65.82.210] Content-Type: multipart/alternative; boundary="_000_4702346c243f403e90271535efac7bffXCHALN008ciscocom_" MIME-Version: 1.0 Archived-At: Subject: Re: [Lsr] LSR WG Last Call for "Signaling MSD (Maximum SID Depth) using OSPF" - 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[67.180.14.36]) by smtp.gmail.com with ESMTPSA id q76-v6sm3269711pfi.139.2018.05.10.08.07.51 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 10 May 2018 08:07:52 -0700 (PDT) User-Agent: Microsoft-MacOutlook/10.c.0.180410 Date: Thu, 10 May 2018 08:07:50 -0700 From: Jeff Tantsura To: "Ketan Talaulikar (ketant)" , "Acee Lindem (acee)" , "lsr@ietf.org" Message-ID: Thread-Topic: [Lsr] LSR WG Last Call for "Signaling MSD (Maximum SID Depth) using OSPF" - draft-ietf-ospf-segment-routing-msd-10.txt References: <52ECD01B-B6A9-4812-B715-7BD1FC07FC91@gmail.com> <4702346c243f403e90271535efac7bff@XCH-ALN-008.cisco.com> In-Reply-To: <4702346c243f403e90271535efac7bff@XCH-ALN-008.cisco.com> Mime-version: 1.0 Content-type: multipart/alternative; boundary="B_3608784471_2145580777" Archived-At: Subject: Re: [Lsr] LSR WG Last Call for "Signaling MSD (Maximum SID Depth) using OSPF" - draft-ietf-ospf-segment-routing-msd-10.txt X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 10 May 2018 15:08:01 -0000 > This message is in MIME format. Since your mail reader does not understand this format, some or all of this message may not be legible. --B_3608784471_2145580777 Content-type: text/plain; charset="UTF-8" Content-transfer-encoding: quoted-printable Hi Ketan, =20 Many thanks for you thoughtful reviews, working with the authors to improve= the draft!=20 =20 Cheers, Jeff From: "Ketan Talaulikar (ketant)" Date: Thursday, May 10, 2018 at 08:05 To: Jeff Tantsura , "Acee Lindem (acee)" , "lsr@ietf.org" Subject: RE: [Lsr] LSR WG Last Call for "Signaling MSD (Maximum SID Depth) = using OSPF" - draft-ietf-ospf-segment-routing-msd-10.txt =20 Hi Jeff, =20 The version 12 addresses all my comments and thanks for the updates. =20 Thanks, Ketan =20 From: Jeff Tantsura =20 Sent: 08 May 2018 04:53 To: Ketan Talaulikar (ketant) ; Acee Lindem (acee) ; lsr@ietf.org Subject: Re: [Lsr] LSR WG Last Call for "Signaling MSD (Maximum SID Depth) = using OSPF" - draft-ietf-ospf-segment-routing-msd-10.txt =20 Hi Ketan, =20 New version (11) should address all your comments, please check and let me = know. ISIS version is being aligned as we speak. =20 Many thanks! =20 Cheers, Jeff From: Lsr on behalf of "Ketan Talaulikar (ketant)" <= ketant@cisco.com> Date: Thursday, April 12, 2018 at 05:04 To: "Acee Lindem (acee)" , "lsr@ietf.org" Subject: Re: [Lsr] LSR WG Last Call for "Signaling MSD (Maximum SID Depth) = using OSPF" - draft-ietf-ospf-segment-routing-msd-10.txt =20 Hi Acee, =20 I have reviewed this draft for OSPF but in the same context also gone over = its corresponding ISIS draft (https://datatracker.ietf.org/doc/draft-ietf-is= is-segment-routing-msd/ ) and some of the comments apply to both since they = are mostly identical in content. =20 I need to ask the question if it makes sense to merge these drafts into a s= ingle one to save everyone cycles and ensure consistency in the spirit of LS= R J =20 General Qs: There are some differences between the ISIS and OSPF versions of this draft= . Could I request the authors to please cross-check and fix? The ISIS draft = does not have some of the issues mentioned below. Do these TLVs apply only when the router is enabled for Segment Routing? i.= e. they should be originated when SR is enabled on the router and the receiv= er should not expect them when SR is disabled? Or do we foresee MSD to be mo= re generic. This aspect needs to be clarified. The allowable values are specified as 0-254 in OSPF draft while ISIS one al= lows 255 as well. The IANA section though says that 255 is reserved. The draft using =E2=80=9Csub-type=E2=80=9D in some places and =E2=80=9Ctype=E2=80=9D in some places= . This is confusing. The ISIS draft uses =E2=80=9Ctype=E2=80=9D everywhere which seems b= etter. Several comments below about the section where OSPF TLVs are defined and I = would suggest to use similar text as in the ISIS draft. I think it is better that the draft mandates that the MSD sub-types SHOULD= be encoded in ascending order? This makes it easier for the receiver/consum= er to detect absence or removal of a specific sub-type from signalling. Reference to RFC4970 should be replaced with RFC7770 Both the ISIS and OSPF drafts are asking IANA for creation of MSD type regi= stry. Should the creation not be done by only one of them and the other poin= ts to it? =20 =20 Sec 1 =20 can be imposed at each node/link on a given SR path =20 It laso also defines the Base MPLS Imposition MSD type. =20 Sec 1.1.1 =20 BMI: Base MPLS Imposition is the number of MPLS labels that can be imposed inclusive of any all service/transport/special labels =20 Sec 3 =20 Node MSD is the minimum MSD supported by all the links of the node. =20 Sub-Type 1 (IANA Section), MSD and the Value field contains maximum MSD of the router originating the RI LSA. =20 =20 Some Qs on Sec 3: In my understanding, the Node MSD is the minimum value of all the Link MSDs= for the links on that node that are enabled in that specific IGP instance. = There may be another IGP instance configured on the same node with a differe= nt set of links and for that instance, the Node MSD may be higher. The same = goes for links that are not configured/enabled under the specific IGP instan= ce. The draft needs to clarify this aspect. The draft needs to specify how many instances of this TLV are allowed in th= e RI LSA and when there are multiple instances in the same or multiple RI LS= A fragments, then how should the receiver handle or interpret them? E.g. use= s the minimum of the signalled Node MSD values or uses the first instance of= the TLV in the lowest fragment, etc. Also, we don=E2=80=99t want multiple instanc= es of the MSD TLV to be encoded for different types =E2=80=93 all of them must be = in a single instance of the MSD TLV. =20 Sec 4 =20 For OSPFv3, the Link level MSD value is advertised as an optional Sub-TLV of the Router-Link E-Router-LSA TLV as defined in [I-D.ietf-ospf-ospfv3-lsa-extend], and has value of TBD3. =20 Sub-Type 1 (IANA Section), MSD and the Value field contains Link MSD of the link router originating the corresponding LSA as specified for OSPFv2 and OSPFv3. =20 Some Qs on Sec 4: The draft needs to specify how many instances of this TLV are allowed in th= e Extended Link Attribute/E-Router LSA and when there are multiple instances= then how should the receiver handle or interpret them? Also, we don=E2=80=99t wan= t multiple instances of the MSD TLV to be encoded for different types =E2=80=93 al= l of them must be in a single instance of the MSD TLV. =20 =20 Sec 5 =20 Suggest to add =E2=80=9CWhen a Link MSD type is not signalled but the Node MSD ty= pe is, then the value of that Link MSD type MUST considered as the correspon= ding Node MSD type value.=E2=80=9D I realize this is obvious but it is better to b= e clarified. This enables routes with homogenous link MSD values to advertis= e just the Node MSD values. I also think this should be RECOMMENDED by the d= raft for flooding efficiencies. =20 Sec 6 =20 The Base MPLS Imposition MSD (BMI-MSD) signals the total number of MPLS labels a node is capable of imposing, including any all service/ Transport/special labels. =20 Sec 8 =20 I think the security section just points to the RI LSA draft, but it also n= eeds to cover the other LSAs. IMHO the security considerations are fairly ge= neric for the protocols but we need the right references here? =20 Thanks, Ketan =20 From: Lsr On Behalf Of Acee Lindem (acee) Sent: 06 April 2018 06:19 To: lsr@ietf.org Subject: [Lsr] LSR WG Last Call for "Signaling MSD (Maximum SID Depth) usin= g OSPF" - draft-ietf-ospf-segment-routing-msd-10.txt =20 This begins an LSR WG last call for the subject draft. Please send your comments to this list prior to 12:00 AM GMT, April 20th, 2018.=20 =20 Thanks, Acee and Chris =20 _______________________________________________ Lsr mailing list Lsr@ietf.o= rg https://www.ietf.org/mailman/listinfo/lsr=20 --B_3608784471_2145580777 Content-type: text/html; charset="UTF-8" Content-transfer-encoding: quoted-printable

    Hi Ketan,

    &= nbsp;

    Many= thanks for you thoughtful reviews, working with the authors to improve the = draft!

     

    Cheers,

    = Jeff

    From: "Ketan Talaulikar (= ketant)" <ketant@cisco.com>
    Date: Thursday, May 10, 201= 8 at 08:05
    To: Jeff Tantsura <jefftant.ietf@gmail.com>, &quo= t;Acee Lindem (acee)" <acee@cisco.com>, "lsr@ietf.org" = <lsr@ietf.org>
    Subject: RE: [Lsr] LSR WG Last Call for "= ;Signaling MSD (Maximum SID Depth) using OSPF" - draft-ietf-ospf-segmen= t-routing-msd-10.txt

     

    Hi Jeff,<= /p>

     

    The version 12 addresses all my comments and thanks for the updates.<= /span>

     

    Thanks,

    Ketan

     <= /o:p>

    Fro= m: Jeff Tantsura <jefftant.ietf= @gmail.com>
    Sent: 08 May 2018 04:53
    To: Ketan Talaul= ikar (ketant) <ketant@cisco.com>; Acee Lindem (acee) <acee@cisco.co= m>; lsr@ietf.org
    Subject: Re: [Lsr] LSR WG Last Call for "= Signaling MSD (Maximum SID Depth) using OSPF" - draft-ietf-ospf-segment= -routing-msd-10.txt

    &nbs= p;

    Hi Ketan,=

    &nbs= p;

    Ne= w version (11) should address all your comments, please check and let me kno= w.

    IS= IS version is being aligned as we speak.

     

    Many thanks!

     

    Cheers,

    Jeff

    From: Lsr <lsr-bounces@ietf.org> on behalf of "K= etan Talaulikar (ketant)" <ketant@= cisco.com>
    Date: Thursday, April 12, 2018 at 05:04
    To= : "Acee Lindem (acee)" <ace= e@cisco.com>, "lsr@ietf.org&qu= ot; <lsr@ietf.org>
    Subject: Re: [Lsr] LSR WG Last Call for "Signaling MSD (Maximum SID Depth) usi= ng OSPF" - draft-ietf-ospf-segment-routing-msd-10.txt    =

     

    Hi Acee,

     

    I have reviewed this draft for OSPF but in the same co= ntext also gone over its corresponding ISIS draft (https:/= /datatracker.ietf.org/doc/draft-ietf-isis-segment-routing-msd/= ) and= some of the comments apply to both since they are mostly identical in conte= nt.

     

    I need to ask the q= uestion if it makes sense to merge these drafts into a single one to save ev= eryone cycles and ensure consistency in the spirit of LSR J

     

    General Qs:

    1. There are some differences between the ISIS and OSPF versions of this= draft. Could I request the authors to please cross-check and fix? The ISIS = draft does not have some of the issues mentioned below.
    2. D= o these TLVs apply only when the router is enabled for Segment Routing? i.e.= they should be originated when SR is enabled on the router and the receiver= should not expect them when SR is disabled? Or do we foresee MSD to be more= generic. This aspect needs to be clarified.
      3. The allowabl= e values are specified as 0-254 in OSPF draft while ISIS one allows 255 as w= ell. The IANA section though says that 255 is reserved.
    3. T= he draft using =E2=80=9Csub-type=E2=80=9D in some places and =E2=80=9Ctype=E2=80=9D in some places. = This is confusing. The ISIS draft uses =E2=80=9Ctype=E2=80=9D everywhere which seems bet= ter.
    4. Several comments below about the section where OSPF = TLVs are defined and I would suggest to use similar text as in the ISIS draf= t.
    5. I think it is better that the draft mandates that the =  MSD sub-types SHOULD be encoded in ascending order? This makes it easi= er for the receiver/consumer to detect absence or removal of a specific sub-= type from signalling.
    6. Reference to RFC4970 should be repl= aced with RFC7770
    7. Both the ISIS and OSPF drafts are askin= g IANA for creation of MSD type registry. Should the creation not be done by= only one of them and the other points to it?
      8. <= /ol>

       

       

      Sec 1

       

      can be imposed at each node/l=
ink on a given SR path
       
      It laso also defines
      &n= bsp;  the Base MPLS Imposition MSD type.= 
      =
 

      Sec 1.= 1.1

       

         BMI: Base MPLS Imposition is the number=
 of MPLS labels that can be
         impos=
ed inclusive of any all service/transport/special label=
s

       

      Sec 3

       

      Node MSD is the minimum MSD supported by all the links of the =
node.
       
      Sub= -Type 1 (IANA Section), MSD and the Value field contains maximum= 
         MSD of the router originating the RI LSA<=
/s>.
       

       

      Some Qs on Sec 3:

      1. In my understanding, the Node MSD is the minimum valu= e of all the Link MSDs for the links on that node that are enabled in that s= pecific IGP instance. There may be another IGP instance configured on the sa= me node with a different set of links and for that instance, the Node MSD ma= y be higher. The same goes for links that are not configured/enabled under t= he specific IGP instance. The draft needs to clarify this aspect.
      2. The draft needs to specify how many instances of this TLV are allow= ed in the RI LSA and when there are multiple instances in the same or multip= le RI LSA fragments, then how should the receiver handle or interpret them? = E.g. uses the minimum of the signalled Node MSD values or uses the first ins= tance of the TLV in the lowest fragment, etc. Also, we don=E2=80=99t want multiple= instances of the MSD TLV to be encoded for different types =E2=80=93 all of them = must be in a single instance of the MSD TLV.

        3.  

        Sec 4

         

           For OSPFv=
3, the Link level MSD value is advertised as an optional
           Sub-TLV of the Router-Link E-Router-LSA TLV as defined in
           [I-D.ietf-ospf-ospfv3-lsa-extend], and has value of TBD3.
         
         &=
nbsp; Sub-Type 1 (IANA Section), MSD and the Value field contains Link MSD
           of the link router originating =
the corresponding LSA as specified for
        =
   OSPFv2 and OSPFv3.<=
o:p>

         

        Some Qs on Sec 4:

        1. The draft needs to specify= how many instances of this TLV are allowed in the Extended Link Attribute/E= -Router LSA and when there are multiple instances then how should the receiv= er handle or interpret them? Also, we don=E2=80=99t want multiple instances of the= MSD TLV to be encoded for different types =E2=80=93 all of them must be in a sing= le instance of the MSD TLV.

         

         

        Sec 5

         = 

        Suggest to add =E2=80=9CWhen a Link MSD type=
 is not signalled but the Node MSD type is, then the value of that Link MSD =
type MUST considered as the corresponding Node MSD type value.=
=E2=80=9D I realize this is obvious=
 but it is better to be clarified. This enables routes with homogenous link =
MSD values to advertise just the Node MSD values. I also think this should b=
e RECOMMENDED by the draft for flooding efficiencies.
         
        Sec=
 6
         
           The Base MPLS Imp=
osition MSD (BMI-MSD) signals the total number of
           MPLS labels a node is capable of imposing, including any=
 all service/
           Transpor=
t/special labels.
         
        Sec 8
         
        I think=
 the security section just points to the RI LSA draft, but it also needs to =
cover the other LSAs. IMHO the security considerations are fairly generic fo=
r the protocols but we need the right references here?
         
        Th=
anks,
        Ketan
         
        Fro=
m: Lsr <lsr-bounces@ietf.org> On Behalf Of Acee Lindem (acee)
        Sent: 06 April 2018 06:19
        To:         lsr@ietf.org=

        Subject: [Lsr] LSR WG Last Call for "Signaling MS=
D (Maximum SID Depth) using OSPF" - draft-ietf-ospf-segment-routing-msd=
-10.txt
         
        This begins an LSR WG last call for the subject draft. Pl=
ease send your
        co=
mments to this list prior to 12:00 AM GMT, April 20th, 2018. 
         =

        Thanks,
        Acee and Chris
         
        __________=
_____________________________________ Lsr mailing list Lsr@ietf.org https://www.ietf.org/mailman/listinfo/lsr<=
span style=3D'mso-bookmark:_MailOriginalBody'> 
        

--B_3608784471_2145580777--




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Thread-Topic: [Lsr] Working Group Last Call on "Signaling MSD (Maximum SID Depth) using OSPF"
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From nobody Thu May 10 17:49:00 2018
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Subject: [Lsr] I-D Action: draft-ietf-isis-segment-routing-msd-11.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Link State Routing WG of the IETF.

        Title           : Signaling MSD (Maximum SID Depth) using IS-IS
        Authors         : Jeff Tantsura
                          Uma Chunduri
                          Sam Aldrin
                          Les Ginsberg
	Filename        : draft-ietf-isis-segment-routing-msd-11.txt
	Pages           : 9
	Date            : 2018-05-10

Abstract:
   This document defines a way for an IS-IS Router to advertise multiple
   types of supported Maximum SID Depths (MSDs) at node and/or link
   granularity.  Such advertisements allow entities (e.g., centralized
   controllers) to determine whether a particular SID stack can be
   supported in a given network.  This document only defines one type of
   MSD maximum label imposition, but defines an encoding that can
   support other MSD types.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-isis-segment-routing-msd/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-isis-segment-routing-msd-11
https://datatracker.ietf.org/doc/html/draft-ietf-isis-segment-routing-msd-11

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-isis-segment-routing-msd-11


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/


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From: "Les Ginsberg (ginsberg)" 
To: "lsr@ietf.org" 
Thread-Topic: [Lsr] I-D Action: draft-ietf-isis-segment-routing-msd-11.txt
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Subject: Re: [Lsr] I-D Action: draft-ietf-isis-segment-routing-msd-11.txt
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This is a minor editorial revision to make the draft consistent w draft-iet=
f-ospf-segment-routing-msd-12.

   Les

> -----Original Message-----
> From: Lsr  On Behalf Of internet-drafts@ietf.org
> Sent: Thursday, May 10, 2018 5:49 PM
> To: i-d-announce@ietf.org
> Cc: lsr@ietf.org
> Subject: [Lsr] I-D Action: draft-ietf-isis-segment-routing-msd-11.txt
>=20
>=20
> A New Internet-Draft is available from the on-line Internet-Drafts direct=
ories.
> This draft is a work item of the Link State Routing WG of the IETF.
>=20
>         Title           : Signaling MSD (Maximum SID Depth) using IS-IS
>         Authors         : Jeff Tantsura
>                           Uma Chunduri
>                           Sam Aldrin
>                           Les Ginsberg
> 	Filename        : draft-ietf-isis-segment-routing-msd-11.txt
> 	Pages           : 9
> 	Date            : 2018-05-10
>=20
> Abstract:
>    This document defines a way for an IS-IS Router to advertise multiple
>    types of supported Maximum SID Depths (MSDs) at node and/or link
>    granularity.  Such advertisements allow entities (e.g., centralized
>    controllers) to determine whether a particular SID stack can be
>    supported in a given network.  This document only defines one type of
>    MSD maximum label imposition, but defines an encoding that can
>    support other MSD types.
>=20
>=20
> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc/draft-ietf-isis-segment-routing-msd/
>=20
> There are also htmlized versions available at:
> https://tools.ietf.org/html/draft-ietf-isis-segment-routing-msd-11
> https://datatracker.ietf.org/doc/html/draft-ietf-isis-segment-routing-msd=
-
> 11
>=20
> A diff from the previous version is available at:
> https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-isis-segment-routing-msd-1=
1
>=20
>=20
> Please note that it may take a couple of minutes from the time of submiss=
ion
> until the htmlized version and diff are available at tools.ietf.org.
>=20
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
>=20
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr


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From: "Les Ginsberg (ginsberg)" 
To: "Acee Lindem (acee)" , "lsr@ietf.org" 
Thread-Topic: [Lsr] Working Group Last Call on "Signaling MSD (Maximum SID Depth) using OSPF"
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Thread-Topic: [Lsr] Working Group Last Call on "Signaling MSD (Maximum SID Depth) using OSPF"
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A new Request for Comments is now available in online RFC libraries.

        
        RFC 8379

        Title:      OSPF Graceful Link Shutdown 
        Author:     S. Hegde,
                    P. Sarkar,
                    H. Gredler,
                    M. Nanduri,
                    L. Jalil
        Status:     Standards Track
        Stream:     IETF
        Date:       May 2018
        Mailbox:    shraddha@juniper.net, 
                    pushpasis.ietf@gmail.com, 
                    hannes@rtbrick.com,
                    mnanduri@ebay.com, 
                    luay.jalil@verizon.com
        Pages:      17
        Characters: 37671
        Updates/Obsoletes/SeeAlso:   None

        I-D Tag:    draft-ietf-ospf-link-overload-16.txt

        URL:        https://www.rfc-editor.org/info/rfc8379

        DOI:        10.17487/RFC8379

When a link is being prepared to be taken out of service, the traffic
needs to be diverted from both ends of the link.  Increasing the
metric to the highest value on one side of the link is not sufficient
to divert the traffic flowing in the other direction.

It is useful for the routers in an OSPFv2 or OSPFv3 routing domain to
be able to advertise a link as being in a graceful-shutdown state to
indicate impending maintenance activity on the link.  This
information can be used by the network devices to reroute the traffic
effectively.

This document describes the protocol extensions to disseminate
graceful-link-shutdown information in OSPFv2 and OSPFv3.

This document is a product of the Open Shortest Path First IGP Working Group of the IETF.

This is now a Proposed Standard.

STANDARDS TRACK: This document specifies an Internet Standards Track
protocol for the Internet community, and requests discussion and suggestions
for improvements.  Please refer to the current edition of the Official
Internet Protocol Standards (https://www.rfc-editor.org/standards) for the 
standardization state and status of this protocol.  Distribution of this 
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From: "Acee Lindem (acee)" 
To: "rfc-editor@rfc-editor.org" 
CC: "lsr@ietf.org" 
Thread-Topic: [Lsr] RFC 8379 on OSPF Graceful Link Shutdown
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Date: Sat, 12 May 2018 09:59:51 +0000
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Subject: Re: [Lsr] RFC 8379 on OSPF Graceful Link Shutdown
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From: "Zafar Ali (zali)" 
To: "Acee Lindem (acee)" , "lsr@ietf.org" 
CC: "Zafar Ali (zali)" 
Thread-Topic: [Lsr] Working Group Last Call on "Signaling MSD (Maximum SID Depth) using OSPF"
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--_000_5A5B4DE12C0DAC44AF501CD9A2B01A8D8F40B684dggemm512mbxchi_--


From nobody Mon May 14 13:03:27 2018
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From: Christian Hopps 
To: "Les Ginsberg \(ginsberg\)" 
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Subject: Re: [Lsr] WG Last Call for draft-ietf-isis-segment-routing-extensions-16
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The WG LC has completed.

Thanks,
Chris.

Les Ginsberg (ginsberg)  writes:

> Support as co-author.
>
> Note that the substantive changes to the document were to remove the unused ERO types - which was a widely supported change.
>
>     Les
>
>
>> -----Original Message-----
>> From: Lsr  On Behalf Of Christian Hopps
>> Sent: Monday, April 23, 2018 7:03 AM
>> To: lsr@ietf.org
>> Cc: lsr-chairs@ietf.org; lsr-ads@ietf.org; chopps@chopps.org
>> Subject: [Lsr] WG Last Call for draft-ietf-isis-segment-routing-extensions-16
>>
>> Hi Folks,
>>
>> We are starting a new 2 week WG last call on
>>
>>   https://datatracker.ietf.org/doc/draft-ietf-isis-segment-routing-
>> extensions/
>>
>> as there have (*) been some changes to the document since our last WG last
>> call last year. Here's the diff.
>>     https://www.ietf.org/rfcdiff?url1=draft-ietf-isis-segment-routing-
>> extensions-12&url2=draft-ietf-isis-segment-routing-extensions-16
>>
>> Will end Monday May 7th.
>>
>> Thanks,
>> Chris.
>>
>> (*) contrary to what you may have heard from folks at the mic in London. :)
>>
>> _______________________________________________
>> Lsr mailing list
>> Lsr@ietf.org
>> https://www.ietf.org/mailman/listinfo/lsr


From nobody Tue May 15 01:54:23 2018
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From: Christian Hopps 
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Subject: Re: [Lsr] I-D Action: draft-ietf-isis-segment-routing-msd-11.txt
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Hi Les,

I was going over the 2 SR-MSD documents (IS-IS and OSPF) just wondering how viable it would be and if we should combine them.

In any case doing the diff highlighted a couple issues in the IS-IS version.

Issue: Under both the Node and Link sub-tlv's the MSD type (1?) is not actually mentioned, only the "MSD value", if one was pedantic it would mean that regardless of the type the value was always the same, certainly not what is intended. :)

Issue: The OSPF version adds text about what to do in the presence of multiple instances of the same TLV. This highlighted the fact that the IS-IS draft doesn't do this, but also doesn't talk about there only being 1 allowed.

Maybe Issue: We've got 2 drafts creating the same sub-[-sub]-tlv MSD type registry. I fully agree that we should only have one registry, but it's interesting that we'll have 2 publications that create and reference it. Also, where does this registry go in IANA? There are distinct IS-IS, OSPFv2 and OSPFv3 pages that contain the IANA registries for each protocol. Should we create a new shared LSR or IGP page? Anyway this might be a reason to combine the 2 documents.

While somewhat inelegant we could probably avoid any need to re-Last Call if the combination was basically a cut and paste operation.

Thanks,
Chris.

Les Ginsberg (ginsberg)  writes:

> This is a minor editorial revision to make the draft consistent w draft-ietf-ospf-segment-routing-msd-12.
>
>    Les
>
>> -----Original Message-----
>> From: Lsr  On Behalf Of internet-drafts@ietf.org
>> Sent: Thursday, May 10, 2018 5:49 PM
>> To: i-d-announce@ietf.org
>> Cc: lsr@ietf.org
>> Subject: [Lsr] I-D Action: draft-ietf-isis-segment-routing-msd-11.txt
>>
>>
>> A New Internet-Draft is available from the on-line Internet-Drafts directories.
>> This draft is a work item of the Link State Routing WG of the IETF.
>>
>>         Title           : Signaling MSD (Maximum SID Depth) using IS-IS
>>         Authors         : Jeff Tantsura
>>                           Uma Chunduri
>>                           Sam Aldrin
>>                           Les Ginsberg
>> 	Filename        : draft-ietf-isis-segment-routing-msd-11.txt
>> 	Pages           : 9
>> 	Date            : 2018-05-10
>>
>> Abstract:
>>    This document defines a way for an IS-IS Router to advertise multiple
>>    types of supported Maximum SID Depths (MSDs) at node and/or link
>>    granularity.  Such advertisements allow entities (e.g., centralized
>>    controllers) to determine whether a particular SID stack can be
>>    supported in a given network.  This document only defines one type of
>>    MSD maximum label imposition, but defines an encoding that can
>>    support other MSD types.
>>
>>
>> The IETF datatracker status page for this draft is:
>> https://datatracker.ietf.org/doc/draft-ietf-isis-segment-routing-msd/
>>
>> There are also htmlized versions available at:
>> https://tools.ietf.org/html/draft-ietf-isis-segment-routing-msd-11
>> https://datatracker.ietf.org/doc/html/draft-ietf-isis-segment-routing-msd-
>> 11
>>
>> A diff from the previous version is available at:
>> https://www.ietf.org/rfcdiff?url2=draft-ietf-isis-segment-routing-msd-11
>>
>>
>> Please note that it may take a couple of minutes from the time of submission
>> until the htmlized version and diff are available at tools.ietf.org.
>>
>> Internet-Drafts are also available by anonymous FTP at:
>> ftp://ftp.ietf.org/internet-drafts/
>>
>> _______________________________________________
>> Lsr mailing list
>> Lsr@ietf.org
>> https://www.ietf.org/mailman/listinfo/lsr
>
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr


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Subject: Re: [Lsr] I-D Action: draft-ietf-isis-segment-routing-msd-11.txt
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Hi Chris,

On 15/05/18 10:54 , Christian Hopps wrote:
>
> Hi Les,
>
> I was going over the 2 SR-MSD documents (IS-IS and OSPF) just wondering
> how viable it would be and if we should combine them.
>
> In any case doing the diff highlighted a couple issues in the IS-IS
> version.
>
> Issue: Under both the Node and Link sub-tlv's the MSD type (1?) is not
> actually mentioned, only the "MSD value", if one was pedantic it would
> mean that regardless of the type the value was always the same,
> certainly not what is intended. :)
>
> Issue: The OSPF version adds text about what to do in the presence of
> multiple instances of the same TLV. This highlighted the fact that the
> IS-IS draft doesn't do this, but also doesn't talk about there only
> being 1 allowed.
>
> Maybe Issue: We've got 2 drafts creating the same sub-[-sub]-tlv MSD
> type registry. I fully agree that we should only have one registry, but
> it's interesting that we'll have 2 publications that create and
> reference it. Also, where does this registry go in IANA? There are
> distinct IS-IS, OSPFv2 and OSPFv3 pages that contain the IANA registries
> for each protocol. Should we create a new shared LSR or IGP page? Anyway
> this might be a reason to combine the 2 documents.

there is one already:
https://www.iana.org/assignments/igp-parameters/igp-parameters.xhtml

I agree that we need registry to be created in only one of the documents 
and have other reference it, unless we merge these two drafts.


thanks,
Peter

>
> While somewhat inelegant we could probably avoid any need to re-Last
> Call if the combination was basically a cut and paste operation.
>
> Thanks,
> Chris.
>
> Les Ginsberg (ginsberg)  writes:
>
>> This is a minor editorial revision to make the draft consistent w
>> draft-ietf-ospf-segment-routing-msd-12.
>>
>>    Les
>>
>>> -----Original Message-----
>>> From: Lsr  On Behalf Of internet-drafts@ietf.org
>>> Sent: Thursday, May 10, 2018 5:49 PM
>>> To: i-d-announce@ietf.org
>>> Cc: lsr@ietf.org
>>> Subject: [Lsr] I-D Action: draft-ietf-isis-segment-routing-msd-11.txt
>>>
>>>
>>> A New Internet-Draft is available from the on-line Internet-Drafts
>>> directories.
>>> This draft is a work item of the Link State Routing WG of the IETF.
>>>
>>>         Title           : Signaling MSD (Maximum SID Depth) using IS-IS
>>>         Authors         : Jeff Tantsura
>>>                           Uma Chunduri
>>>                           Sam Aldrin
>>>                           Les Ginsberg
>>>     Filename        : draft-ietf-isis-segment-routing-msd-11.txt
>>>     Pages           : 9
>>>     Date            : 2018-05-10
>>>
>>> Abstract:
>>>    This document defines a way for an IS-IS Router to advertise multiple
>>>    types of supported Maximum SID Depths (MSDs) at node and/or link
>>>    granularity.  Such advertisements allow entities (e.g., centralized
>>>    controllers) to determine whether a particular SID stack can be
>>>    supported in a given network.  This document only defines one type of
>>>    MSD maximum label imposition, but defines an encoding that can
>>>    support other MSD types.
>>>
>>>
>>> The IETF datatracker status page for this draft is:
>>> https://datatracker.ietf.org/doc/draft-ietf-isis-segment-routing-msd/
>>>
>>> There are also htmlized versions available at:
>>> https://tools.ietf.org/html/draft-ietf-isis-segment-routing-msd-11
>>> https://datatracker.ietf.org/doc/html/draft-ietf-isis-segment-routing-msd-
>>>
>>> 11
>>>
>>> A diff from the previous version is available at:
>>> https://www.ietf.org/rfcdiff?url2=draft-ietf-isis-segment-routing-msd-11
>>>
>>>
>>> Please note that it may take a couple of minutes from the time of
>>> submission
>>> until the htmlized version and diff are available at tools.ietf.org.
>>>
>>> Internet-Drafts are also available by anonymous FTP at:
>>> ftp://ftp.ietf.org/internet-drafts/
>>>
>>> _______________________________________________
>>> Lsr mailing list
>>> Lsr@ietf.org
>>> https://www.ietf.org/mailman/listinfo/lsr
>>
>> _______________________________________________
>> Lsr mailing list
>> Lsr@ietf.org
>> https://www.ietf.org/mailman/listinfo/lsr
>
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr
> .
>


From nobody Tue May 15 03:27:57 2018
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Subject: [Lsr] I-D Action: draft-ietf-lsr-flex-algo-00.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Link State Routing WG of the IETF.

        Title           : IGP Flexible Algorithm
        Authors         : Peter Psenak
                          Shraddha Hegde
                          Clarence Filsfils
                          Ketan Talaulikar
                          Arkadiy Gulko
	Filename        : draft-ietf-lsr-flex-algo-00.txt
	Pages           : 23
	Date            : 2018-05-15

Abstract:
   IGP protocols traditionally compute best paths over the network based
   on the IGP metric assigned to the links.  Many network deployments
   use RSVP-TE based or Segment Routing based Traffic Engineering to
   enforce traffic over a path that is computed using different metrics
   or constraints than the shortest IGP path.  This document proposes a
   solution that allows IGPs themselves to compute constraint based
   paths over the network.  This document also specifies a way of using
   Segment Routing Prefix-SIDs to steer packets along the constraint-
   based paths.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-lsr-flex-algo/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-lsr-flex-algo-00
https://datatracker.ietf.org/doc/html/draft-ietf-lsr-flex-algo-00


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From nobody Tue May 15 04:26:08 2018
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Subject: [Lsr] I-D Action: draft-ietf-ospf-lls-interface-id-02.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Link State Routing WG of the IETF.

        Title           : OSPF LLS Extensions for Local Interface ID Advertisement
        Authors         : Peter Psenak
                          Ketan Jivan Talaulikar
                          Wim Henderickx
                          Padma Pillay-Esnault
	Filename        : draft-ietf-ospf-lls-interface-id-02.txt
	Pages           : 6
	Date            : 2018-05-15

Abstract:
   This draft describes the extensions to OSPF link-local signaling to
   advertise Local Interface Identifier.



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-ospf-lls-interface-id/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-ospf-lls-interface-id-02
https://datatracker.ietf.org/doc/html/draft-ietf-ospf-lls-interface-id-02

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-ospf-lls-interface-id-02


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Date: Tue, 15 May 2018 13:43:23 +0200
From: Jeff Tantsura 
To: Peter Psenak , Christian Hopps , "Les Ginsberg (ginsberg)" 
CC: "lsr@ietf.org" 
Message-ID: 
Thread-Topic: [Lsr] I-D Action: draft-ietf-isis-segment-routing-msd-11.txt
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Hi Chris,

I don't see much value in merging, most of the content describes encodings =
which are different, per protocol,
Wrt registry - please let us know which draft you'd want to request the new=
 registry.

Thanks!=20

Cheers,
Jeff
=EF=BB=BFOn 5/15/18, 11:33, "Lsr on behalf of Peter Psenak"  wrote:

    Hi Chris,
   =20
    On 15/05/18 10:54 , Christian Hopps wrote:
    >
    > Hi Les,
    >
    > I was going over the 2 SR-MSD documents (IS-IS and OSPF) just wonderi=
ng
    > how viable it would be and if we should combine them.
    >
    > In any case doing the diff highlighted a couple issues in the IS-IS
    > version.
    >
    > Issue: Under both the Node and Link sub-tlv's the MSD type (1?) is no=
t
    > actually mentioned, only the "MSD value", if one was pedantic it woul=
d
    > mean that regardless of the type the value was always the same,
    > certainly not what is intended. :)
    >
    > Issue: The OSPF version adds text about what to do in the presence of
    > multiple instances of the same TLV. This highlighted the fact that th=
e
    > IS-IS draft doesn't do this, but also doesn't talk about there only
    > being 1 allowed.
    >
    > Maybe Issue: We've got 2 drafts creating the same sub-[-sub]-tlv MSD
    > type registry. I fully agree that we should only have one registry, b=
ut
    > it's interesting that we'll have 2 publications that create and
    > reference it. Also, where does this registry go in IANA? There are
    > distinct IS-IS, OSPFv2 and OSPFv3 pages that contain the IANA registr=
ies
    > for each protocol. Should we create a new shared LSR or IGP page? Any=
way
    > this might be a reason to combine the 2 documents.
   =20
    there is one already:
    https://www.iana.org/assignments/igp-parameters/igp-parameters.xhtml
   =20
    I agree that we need registry to be created in only one of the document=
s=20
    and have other reference it, unless we merge these two drafts.
   =20
   =20
    thanks,
    Peter
   =20
    >
    > While somewhat inelegant we could probably avoid any need to re-Last
    > Call if the combination was basically a cut and paste operation.
    >
    > Thanks,
    > Chris.
    >
    > Les Ginsberg (ginsberg)  writes:
    >
    >> This is a minor editorial revision to make the draft consistent w
    >> draft-ietf-ospf-segment-routing-msd-12.
    >>
    >>    Les
    >>
    >>> -----Original Message-----
    >>> From: Lsr  On Behalf Of internet-drafts@ietf.=
org
    >>> Sent: Thursday, May 10, 2018 5:49 PM
    >>> To: i-d-announce@ietf.org
    >>> Cc: lsr@ietf.org
    >>> Subject: [Lsr] I-D Action: draft-ietf-isis-segment-routing-msd-11.t=
xt
    >>>
    >>>
    >>> A New Internet-Draft is available from the on-line Internet-Drafts
    >>> directories.
    >>> This draft is a work item of the Link State Routing WG of the IETF.
    >>>
    >>>         Title           : Signaling MSD (Maximum SID Depth) using I=
S-IS
    >>>         Authors         : Jeff Tantsura
    >>>                           Uma Chunduri
    >>>                           Sam Aldrin
    >>>                           Les Ginsberg
    >>>     Filename        : draft-ietf-isis-segment-routing-msd-11.txt
    >>>     Pages           : 9
    >>>     Date            : 2018-05-10
    >>>
    >>> Abstract:
    >>>    This document defines a way for an IS-IS Router to advertise mul=
tiple
    >>>    types of supported Maximum SID Depths (MSDs) at node and/or link
    >>>    granularity.  Such advertisements allow entities (e.g., centrali=
zed
    >>>    controllers) to determine whether a particular SID stack can be
    >>>    supported in a given network.  This document only defines one ty=
pe of
    >>>    MSD maximum label imposition, but defines an encoding that can
    >>>    support other MSD types.
    >>>
    >>>
    >>> The IETF datatracker status page for this draft is:
    >>> https://datatracker.ietf.org/doc/draft-ietf-isis-segment-routing-ms=
d/
    >>>
    >>> There are also htmlized versions available at:
    >>> https://tools.ietf.org/html/draft-ietf-isis-segment-routing-msd-11
    >>> https://datatracker.ietf.org/doc/html/draft-ietf-isis-segment-routi=
ng-msd-
    >>>
    >>> 11
    >>>
    >>> A diff from the previous version is available at:
    >>> https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-isis-segment-routing-m=
sd-11
    >>>
    >>>
    >>> Please note that it may take a couple of minutes from the time of
    >>> submission
    >>> until the htmlized version and diff are available at tools.ietf.org=
.
    >>>
    >>> Internet-Drafts are also available by anonymous FTP at:
    >>> ftp://ftp.ietf.org/internet-drafts/
    >>>
    >>> _______________________________________________
    >>> Lsr mailing list
    >>> Lsr@ietf.org
    >>> https://www.ietf.org/mailman/listinfo/lsr
    >>
    >> _______________________________________________
    >> Lsr mailing list
    >> Lsr@ietf.org
    >> https://www.ietf.org/mailman/listinfo/lsr
    >
    > _______________________________________________
    > Lsr mailing list
    > Lsr@ietf.org
    > https://www.ietf.org/mailman/listinfo/lsr
    > .
    >
   =20
    _______________________________________________
    Lsr mailing list
    Lsr@ietf.org
    https://www.ietf.org/mailman/listinfo/lsr
   =20



From nobody Tue May 15 06:13:45 2018
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From: Christian Hopps 
To: Jeff Tantsura 
Cc: Peter Psenak , Christian Hopps , "Les Ginsberg \(ginsberg\)" , "lsr\@ietf.org" 
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Date: Tue, 15 May 2018 09:13:39 -0400
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Subject: Re: [Lsr] I-D Action: draft-ietf-isis-segment-routing-msd-11.txt
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Please notice I raised 2 other issues outside of merging. If there will be a rev to the IS-IS document to deal with those then you could pull the registry definition from it and simply refer to the one defined by the OSPF document. We need to make sure that the OSPF document causes the registry to go to the IGP IANA page and not to OSPF though.

I'm fine with skipping the merging; however, them both being mostly encoding drafts doesn't preclude merging either. In fact all the rest of the text is /almost/ copy and paste, and repeating things in standards with slight differences is usually a bad idea. In this case though we're almost done so let's just finish the work and flex algorithm can be our first merged document instead.

Thanks,
Chris.

Jeff Tantsura  writes:

> Hi Chris,
>
> I don't see much value in merging, most of the content describes encodings which are different, per protocol,
> Wrt registry - please let us know which draft you'd want to request the new registry.
>
> Thanks!
>
> Cheers,
> Jeff
> On 5/15/18, 11:33, "Lsr on behalf of Peter Psenak"  wrote:
>
>     Hi Chris,
>
>     On 15/05/18 10:54 , Christian Hopps wrote:
>     >
>     > Hi Les,
>     >
>     > I was going over the 2 SR-MSD documents (IS-IS and OSPF) just wondering
>     > how viable it would be and if we should combine them.
>     >
>     > In any case doing the diff highlighted a couple issues in the IS-IS
>     > version.
>     >
>     > Issue: Under both the Node and Link sub-tlv's the MSD type (1?) is not
>     > actually mentioned, only the "MSD value", if one was pedantic it would
>     > mean that regardless of the type the value was always the same,
>     > certainly not what is intended. :)
>     >
>     > Issue: The OSPF version adds text about what to do in the presence of
>     > multiple instances of the same TLV. This highlighted the fact that the
>     > IS-IS draft doesn't do this, but also doesn't talk about there only
>     > being 1 allowed.
>     >
>     > Maybe Issue: We've got 2 drafts creating the same sub-[-sub]-tlv MSD
>     > type registry. I fully agree that we should only have one registry, but
>     > it's interesting that we'll have 2 publications that create and
>     > reference it. Also, where does this registry go in IANA? There are
>     > distinct IS-IS, OSPFv2 and OSPFv3 pages that contain the IANA registries
>     > for each protocol. Should we create a new shared LSR or IGP page? Anyway
>     > this might be a reason to combine the 2 documents.
>
>     there is one already:
>     https://www.iana.org/assignments/igp-parameters/igp-parameters.xhtml
>
>     I agree that we need registry to be created in only one of the documents
>     and have other reference it, unless we merge these two drafts.
>
>
>     thanks,
>     Peter
>
>     >
>     > While somewhat inelegant we could probably avoid any need to re-Last
>     > Call if the combination was basically a cut and paste operation.
>     >
>     > Thanks,
>     > Chris.
>     >
>     > Les Ginsberg (ginsberg)  writes:
>     >
>     >> This is a minor editorial revision to make the draft consistent w
>     >> draft-ietf-ospf-segment-routing-msd-12.
>     >>
>     >>    Les
>     >>
>     >>> -----Original Message-----
>     >>> From: Lsr  On Behalf Of internet-drafts@ietf.org
>     >>> Sent: Thursday, May 10, 2018 5:49 PM
>     >>> To: i-d-announce@ietf.org
>     >>> Cc: lsr@ietf.org
>     >>> Subject: [Lsr] I-D Action: draft-ietf-isis-segment-routing-msd-11.txt
>     >>>
>     >>>
>     >>> A New Internet-Draft is available from the on-line Internet-Drafts
>     >>> directories.
>     >>> This draft is a work item of the Link State Routing WG of the IETF.
>     >>>
>     >>>         Title           : Signaling MSD (Maximum SID Depth) using IS-IS
>     >>>         Authors         : Jeff Tantsura
>     >>>                           Uma Chunduri
>     >>>                           Sam Aldrin
>     >>>                           Les Ginsberg
>     >>>     Filename        : draft-ietf-isis-segment-routing-msd-11.txt
>     >>>     Pages           : 9
>     >>>     Date            : 2018-05-10
>     >>>
>     >>> Abstract:
>     >>>    This document defines a way for an IS-IS Router to advertise multiple
>     >>>    types of supported Maximum SID Depths (MSDs) at node and/or link
>     >>>    granularity.  Such advertisements allow entities (e.g., centralized
>     >>>    controllers) to determine whether a particular SID stack can be
>     >>>    supported in a given network.  This document only defines one type of
>     >>>    MSD maximum label imposition, but defines an encoding that can
>     >>>    support other MSD types.
>     >>>
>     >>>
>     >>> The IETF datatracker status page for this draft is:
>     >>> https://datatracker.ietf.org/doc/draft-ietf-isis-segment-routing-msd/
>     >>>
>     >>> There are also htmlized versions available at:
>     >>> https://tools.ietf.org/html/draft-ietf-isis-segment-routing-msd-11
>     >>> https://datatracker.ietf.org/doc/html/draft-ietf-isis-segment-routing-msd-
>     >>>
>     >>> 11
>     >>>
>     >>> A diff from the previous version is available at:
>     >>> https://www.ietf.org/rfcdiff?url2=draft-ietf-isis-segment-routing-msd-11
>     >>>
>     >>>
>     >>> Please note that it may take a couple of minutes from the time of
>     >>> submission
>     >>> until the htmlized version and diff are available at tools.ietf.org.
>     >>>
>     >>> Internet-Drafts are also available by anonymous FTP at:
>     >>> ftp://ftp.ietf.org/internet-drafts/
>     >>>
>     >>> _______________________________________________
>     >>> Lsr mailing list
>     >>> Lsr@ietf.org
>     >>> https://www.ietf.org/mailman/listinfo/lsr
>     >>
>     >> _______________________________________________
>     >> Lsr mailing list
>     >> Lsr@ietf.org
>     >> https://www.ietf.org/mailman/listinfo/lsr
>     >
>     > _______________________________________________
>     > Lsr mailing list
>     > Lsr@ietf.org
>     > https://www.ietf.org/mailman/listinfo/lsr
>     > .
>     >
>
>     _______________________________________________
>     Lsr mailing list
>     Lsr@ietf.org
>     https://www.ietf.org/mailman/listinfo/lsr
>


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From: "Les Ginsberg (ginsberg)" 
To: Christian Hopps 
CC: "lsr@ietf.org" 
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Chris -



> -----Original Message-----

> From: Christian Hopps 

> Sent: Tuesday, May 15, 2018 1:54 AM

> To: Les Ginsberg (ginsberg) 

> Cc: lsr@ietf.org

> Subject: Re: [Lsr] I-D Action: draft-ietf-isis-segment-routing-msd-11.txt

>

>

> Hi Les,

>

> I was going over the 2 SR-MSD documents (IS-IS and OSPF) just wondering

> how viable it would be and if we should combine them.

>

[Les:] (I knew somebody would ask this question. :-) )

The two documents were fairly mature before the official merging of the two=
 IGP WGs and certainly before we actively started pursuing combined documen=
ts in cases where it makes sense.



Whatever benefit might accrue from combining the documents (and you can see=
 from the responses on the list that there are different opinions about thi=
s) it is overwhelmed by the delay that is likely to be introduced by taking=
 two documents that have already passed last call and revising them into on=
e document.



We have mature documents, we have implementations, we need to proceed to pu=
blication without introducing unnecessary delays.



> In any case doing the diff highlighted a couple issues in the IS-IS versi=
on.

>

> Issue: Under both the Node and Link sub-tlv's the MSD type (1?) is not

> actually mentioned, only the "MSD value", if one was pedantic it would me=
an

> that regardless of the type the value was always the same, certainly not =
what

> is intended. :)



[Les:] In both sections the draft says (emphasis added):



"Value: field consists of one or more pairs of a 1 octet MSD-Type

   (IANA Registry) and 1 octet Value.



Why do you see this as unclear?



>

> Issue: The OSPF version adds text about what to do in the presence of

> multiple instances of the same TLV. This highlighted the fact that the IS=
-IS

> draft doesn't do this, but also doesn't talk about there only being 1 all=
owed.

>



[Les:] MSD inherits the procedures defined in https://tools.ietf.org/html/r=
fc7981#section-3 .

There is therefore no need for further specification.



The meaning of "one allowed" is not the same in IS-IS. Clearly multiple MSD=
 sub-TLVs are allowed since there are 255 possible MSD types and they would=
 not all fit into a single sub-TLV.



> Maybe Issue: We've got 2 drafts creating the same sub-[-sub]-tlv MSD type

> registry. I fully agree that we should only have one registry, but it's

> interesting that we'll have 2 publications that create and reference it. =
Also,

> where does this registry go in IANA? There are distinct IS-IS, OSPFv2 and

> OSPFv3 pages that contain the IANA registries for each protocol. Should w=
e

> create a new shared LSR or IGP page? Anyway this might be a reason to

> combine the 2 documents.

>

[Les:] Peter has already responded as to "where the registry goes" - which =
is clearly stated in the drafts:



"This document requests creation of an IANA managed registry under a

   new category of "Interior Gateway Protocol (IGP) Parameters" IANA

   registries..."



I agree only one document should define the registry and the other should r=
eference it. That was the agreement between the authors - but it seems we d=
id execute well. We will discuss and decide which draft to change.



    Les

> While somewhat inelegant we could probably avoid any need to re-Last Call=
 if

> the combination was basically a cut and paste operation.

>

> Thanks,

> Chris.

>

> Les Ginsberg (ginsberg) > w=
rites:

>

> > This is a minor editorial revision to make the draft consistent w draft=
-ietf-

> ospf-segment-routing-msd-12.

> >

> >    Les

> >

> >> -----Original Message-----

> >> From: Lsr > On Behal=
f Of

> >> internet-drafts@ietf.org

> >> Sent: Thursday, May 10, 2018 5:49 PM

> >> To: i-d-announce@ietf.org

> >> Cc: lsr@ietf.org

> >> Subject: [Lsr] I-D Action: draft-ietf-isis-segment-routing-msd-11.txt

> >>

> >>

> >> A New Internet-Draft is available from the on-line Internet-Drafts

> directories.

> >> This draft is a work item of the Link State Routing WG of the IETF.

> >>

> >>         Title           : Signaling MSD (Maximum SID Depth) using IS-I=
S

> >>         Authors         : Jeff Tantsura

> >>                           Uma Chunduri

> >>                           Sam Aldrin

> >>                           Les Ginsberg

> >>       Filename        : draft-ietf-isis-segment-routing-msd-11.txt

> >>       Pages           : 9

> >>       Date            : 2018-05-10

> >>

> >> Abstract:

> >>    This document defines a way for an IS-IS Router to advertise multip=
le

> >>    types of supported Maximum SID Depths (MSDs) at node and/or link

> >>    granularity.  Such advertisements allow entities (e.g., centralized

> >>    controllers) to determine whether a particular SID stack can be

> >>    supported in a given network.  This document only defines one type =
of

> >>    MSD maximum label imposition, but defines an encoding that can

> >>    support other MSD types.

> >>

> >>

> >> The IETF datatracker status page for this draft is:

> >> https://datatracker.ietf.org/doc/draft-ietf-isis-segment-routing-msd/

> >>

> >> There are also htmlized versions available at:

> >> https://tools.ietf.org/html/draft-ietf-isis-segment-routing-msd-11

> >> https://datatracker.ietf.org/doc/html/draft-ietf-isis-segment-routing

> >> -msd-

> >> 11

> >>

> >> A diff from the previous version is available at:

> >> https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-isis-segment-routing-ms=
d

> >> -11

> >>

> >>

> >> Please note that it may take a couple of minutes from the time of

> >> submission until the htmlized version and diff are available at

> tools.ietf.org.

> >>

> >> Internet-Drafts are also available by anonymous FTP at:

> >> ftp://ftp.ietf.org/internet-drafts/

> >>

> >> _______________________________________________

> >> Lsr mailing list

> >> Lsr@ietf.org

> >> https://www.ietf.org/mailman/listinfo/lsr

> >

> > _______________________________________________

> > Lsr mailing list

> > Lsr@ietf.org

> > https://www.ietf.org/mailman/listinfo/lsr



--_000_3fed98c8adef445e94df465e78e265f7XCHALN001ciscocom_
Content-Type: text/html; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable









        

        Chris -
        

         
        

        > -----Original Message-----
        

        > From: Christian Hopps <chopps@chopps.org&=
gt;
        

        > Sent: Tuesday, May 15, 2018 1:54 AM
        

        > To: Les Ginsberg (ginsberg) <ginsberg@cis=
co.com>
        

        > Cc: lsr@ietf.org
        

        > Subject: Re: [Lsr] I-D Action: draft-ietf-is=
is-segment-routing-msd-11.txt
        

        > 
        

        > 
        

        > Hi Les,
        

        > 
        

        > I was going over the 2 SR-MSD documents (IS-=
IS and OSPF) just wondering
        

        > how viable it would be and if we should comb=
ine them.
        

        > 
        

        [Les:] (I knew somebo=
dy would ask this question. :-) )
        

        The two documents wer=
e fairly mature before the official merging of the two IGP WGs and certainl=
y before we actively started pursuing combined documents in cases where it =
makes sense.
        

         
        

        Whatever benefit migh=
t accrue from combining the documents (and you can see from the responses o=
n the list that there are different opinions about this) it is overwhelmed =
by the delay that is likely to be introduced
 by taking two documents that have already passed last call and revising th=
em into one document.
        

         
        

        We have mature docume=
nts, we have implementations, we need to proceed to publication without int=
roducing unnecessary delays.
        

         
        

        > In any case doing the diff highlighted a cou=
ple issues in the IS-IS version.
        

        > 
        

        > Issue: Under both the Node and Link sub-tlv'=
s the MSD type (1?) is not
        

        > actually mentioned, only the "MSD value=
", if one was pedantic it would mean
        

        > that regardless of the type the value was al=
ways the same, certainly not what
        

        > is intended. :)
        

         
        

        [Les:] In both sections the draft says (emphasis =
added):
        

         
        

        "Value: field consists of one or more pairs =
of a 1 octet MSD-Type

           (IANA R=
egistry)
and 1 octet Value.
        

         
        

        Why do you see this as unclear?
        

         
        

        > 
        

        > Issue: The OSPF version adds text about what=
 to do in the presence of
        

        > multiple instances of the same TLV. This hig=
hlighted the fact that the IS-IS
        

        > draft doesn't do this, but also doesn't talk=
 about there only being 1 allowed.
        

        > 
        

         
        

        [Les:] MSD inherits the procedures defined =
in 
https://tools.ietf.org/html/rfc7981#section-3 .
        

        There is therefore no need for further spec=
ification.
        

         
        

        The meaning of “one allowed” is=
 not the same in IS-IS. Clearly multiple MSD sub-TLVs are allowed since the=
re are 255 possible MSD types and they would not all fit into a single sub-=
TLV.
        

         
        

        > Maybe Issue: We've got 2 drafts creating the=
 same sub-[-sub]-tlv MSD type
        

        > registry. I fully agree that we should only =
have one registry, but it's
        

        > interesting that we'll have 2 publications t=
hat create and reference it. Also,
        

        > where does this registry go in IANA? There a=
re distinct IS-IS, OSPFv2 and
        

        > OSPFv3 pages that contain the IANA registrie=
s for each protocol. Should we
        

        > create a new shared LSR or IGP page? Anyway =
this might be a reason to
        

        > combine the 2 documents.
        

        > 
        

        [Les:] Peter has already responded as to &#=
8220;where the registry goes” – which is clearly stated in the =
drafts:
        

         
        

        “This document requests creation of a=
n IANA managed registry under a
        

           new category of "Interior=
 Gateway Protocol (IGP) Parameters" IANA
        

           registries…”<=
/o:p>
        

         
        

        I agree only one document should define the=
 registry and the other should reference it. That was the agreement between=
 the authors – but it seems we did execute well. We will discuss and =
decide which draft to change.
        

         
        

            Les
        

        

        > While somewhat inelegant we could probably a=
void any need to re-Last Call if
        

        > the combination was basically a cut and past=
e operation.
        

        > 
        

        > Thanks,
        

        > Chris.
        

        > 
        

        > Les Ginsberg (ginsberg) <ginsberg@cisco.com> writes:
        

        > 
        

        > > This is a minor editorial revision to m=
ake the draft consistent w draft-ietf-
        

        > ospf-segment-routing-msd-12.
        

        > >
        

        > >    Les
        

        > >
        

        > >> -----Original Message-----
        

        > >> From: Lsr <ls=
r-bounces@ietf.org> On Behalf Of
        

        > >> internet-dra=
fts@ietf.org
        

        > >> Sent: Thursday, May 10, 2018 5:49 P=
M
        

        > >> To: i-d-announc=
e@ietf.org
        

        > >> Cc: lsr@ietf.org<=
/a>
        

        > >> Subject: [Lsr] I-D Action: draft-ie=
tf-isis-segment-routing-msd-11.txt
        

        > >>
        

        > >>
        

        > >> A New Internet-Draft is available f=
rom the on-line Internet-Drafts
        

        > directories.
        

        > >> This draft is a work item of the Li=
nk State Routing WG of the IETF.
        

        > >>
        

        > >>      =
   Title         &nb=
sp; : Signaling MSD (Maximum SID Depth) using IS-IS
        

        > >>      =
   Authors         : Jeff=
 Tantsura
        

        > >>      =
            &nb=
sp;        Uma Chunduri
        

        > >>      =
            &nb=
sp;        Sam Aldrin
        

        > >>      =
            &nb=
sp;        Les Ginsberg
        

        > >>       File=
name        : draft-ietf-isis-segment-ro=
uting-msd-11.txt
        

        > >>       Page=
s           : 9
        

        > >>       Date=
            : 2018-0=
5-10
        

        > >>
        

        > >> Abstract:
        

        > >>    This document def=
ines a way for an IS-IS Router to advertise multiple
        

        > >>    types of supporte=
d Maximum SID Depths (MSDs) at node and/or link
        

        > >>    granularity. =
; Such advertisements allow entities (e.g., centralized
        

        > >>    controllers) to d=
etermine whether a particular SID stack can be
        

        > >>    supported in a gi=
ven network.  This document only defines one type of
        

        > >>    MSD maximum label=
 imposition, but defines an encoding that can
        

        > >>    support other MSD=
 types.
        

        > >>
        

        > >>
        

        > >> The IETF datatracker status page fo=
r this draft is:
        

        > >> 
https://datatracker.i=
etf.org/doc/draft-ietf-isis-segment-routing-msd/
        

        > >>
        

        > >> There are also htmlized versions av=
ailable at:
        

        > >> 
https://tools.ietf.or=
g/html/draft-ietf-isis-segment-routing-msd-11
        

        > >> 
https://datatracker.i=
etf.org/doc/html/draft-ietf-isis-segment-routing
        

        > >> -msd-
        

        > >> 11
        

        > >>
        

        > >> A diff from the previous version is=
 available at:
        

        > >> 
https://www.ietf.org/=
rfcdiff?url2=3Ddraft-ietf-isis-segment-routing-msd
        

        > >> -11
        

        > >>
        

        > >>
        

        > >> Please note that it may take a coup=
le of minutes from the time of
        

        > >> submission until the htmlized versi=
on and diff are available at
        

        > tools.ietf.org.
        

        > >>
        

        > >> Internet-Drafts are also available =
by anonymous FTP at:
        

        > >> ftp://ft=
p.ietf.org/internet-drafts/
        

        > >>
        

        > >> ___________________________________=
____________
        

        > >> Lsr mailing list
        

        > >> Lsr@ietf.org<=
/p>

        > >> 
https://www.ietf.org/=
mailman/listinfo/lsr
        

        > >
        

        > > _______________________________________=
________
        

        > > Lsr mailing list
        

        > > Lsr@ietf.org
        

        > > https:=
//www.ietf.org/mailman/listinfo/lsr
        

         
        

        



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CC: Christian Hopps , "lsr@ietf.org" , "draft-ietf-isis-segment-routing-extensions@ietf.org" , Uma Chunduri 
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From: Christian Hopps 
To: "Les Ginsberg \(ginsberg\)" 
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Subject: Re: [Lsr] I-D Action: draft-ietf-isis-segment-routing-msd-11.txt
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Les Ginsberg (ginsberg)  writes:

> Chris -
>
>> Issue: Under both the Node and Link sub-tlv's the MSD type (1?) is not
>> actually mentioned, only the "MSD value", if one was pedantic it would mean
>> that regardless of the type the value was always the same, certainly not what
>> is intended. :)
>
> [Les:] In both sections the draft says (emphasis added):
>
> "Value: field consists of one or more pairs of a 1 octet MSD-Type
>    (IANA Registry) and 1 octet Value.
>
> Why do you see this as unclear?

Let me come at this a different way:

    Type -- specified: 23
    Value -- specified: pairs of MSD type and MSD values.
    MSD-Type  -- *unspecified*
    MSD-Value -- specified "the MSD value is a number ..."

One might could infer after looking at the *current* registry that the only valid value could be:

    Type: 1 -- Base MPLS Imposition MSD

However, the text also doesn't even use "Base MPLS Imposition MSD" to describe the MSD value here (it talks about this in later sections), so I'd say it's under-specified at this point.

Or is it in fact the case that you are saying that no matter what the MSD-Type is the MSD value will always be as defined currently in sections 2 and 3? That's would be surprising enough that I think it would need to be made explicit.

FWIW, I noticed this by doing a diff so here's the OSPF text:

   "MSD Type 1 (IANA Section), MSD and the Value field contains the MSD
   of the originating router.  Node MSD is a number in the range of
   0-255. 0 represents lack of the ability to impose MSD stack of any
   depth; any other value represents that of the node.  This value
   SHOULD represent the minimum value supported by a node."

That text looks a bit off too ("MSD and the Value field"?), but at least its saying the MSD type is "1".

Note: this comment refers to both the Node and Link sub-TLVs.

>> Issue: The OSPF version adds text about what to do in the presence of
>> multiple instances of the same TLV. This highlighted the fact that the IS-IS
>> draft doesn't do this, but also doesn't talk about there only being 1 allowed.
>
> [Les:] MSD inherits the procedures defined in https://tools.ietf.org/html/rfc7981#section-3 .
>
> There is therefore no need for further specification.

Well that might cover the Node TLV, but not the Link TLV, right?

> The meaning of "one allowed" is not the same in IS-IS. Clearly multiple MSD sub-TLVs are allowed since there are 255 possible MSD types and they would not all fit into a single sub-TLV.

The main point I'm making here is that the OSPF document goes out of it's way to be explicit about multiple values not being allowed, the IS-IS document leaves this unspecified.

Thanks,
Chris.


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CC: Christian Hopps , "lsr@ietf.org" , "draft-ietf-isis-segment-routing-extensions@ietf.org" , Uma Chunduri 
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From: "Les Ginsberg (ginsberg)" 
To: Christian Hopps 
CC: "lsr@ietf.org" 
Thread-Topic: [Lsr] I-D Action: draft-ietf-isis-segment-routing-msd-11.txt
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Subject: Re: [Lsr] I-D Action: draft-ietf-isis-segment-routing-msd-11.txt
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Chris -

> -----Original Message-----
> From: Lsr  On Behalf Of Christian Hopps
> Sent: Tuesday, May 15, 2018 8:08 AM
> To: Les Ginsberg (ginsberg) 
> Cc: lsr@ietf.org; Christian Hopps 
> Subject: Re: [Lsr] I-D Action: draft-ietf-isis-segment-routing-msd-11.txt
>=20
>=20
> Les Ginsberg (ginsberg)  writes:
>=20
> > Chris -
> >
> >> Issue: Under both the Node and Link sub-tlv's the MSD type (1?) is
> >> not actually mentioned, only the "MSD value", if one was pedantic it
> >> would mean that regardless of the type the value was always the same,
> >> certainly not what is intended. :)
> >
> > [Les:] In both sections the draft says (emphasis added):
> >
> > "Value: field consists of one or more pairs of a 1 octet MSD-Type
> >    (IANA Registry) and 1 octet Value.
> >
> > Why do you see this as unclear?
>=20
> Let me come at this a different way:
>=20
>     Type -- specified: 23
>     Value -- specified: pairs of MSD type and MSD values.
>     MSD-Type  -- *unspecified*
[Les:] The draft says (repeating myself):

"Value: field consists of one or more pairs of a 1 octet MSD-Type
   (IANA Registry) and 1 octet Value."

This clearly specifies that the "MSD-Type" is one of the values in the IANA=
 registry.

>     MSD-Value -- specified "the MSD value is a number ..."
>=20
> One might could infer after looking at the *current* registry that the on=
ly
> valid value could be:
>=20
>     Type: 1 -- Base MPLS Imposition MSD

[Les:] And you would be correct. Until such time as other values are added =
to the registry the meaning of anything other than "1" is undefined.
But this section (and the companion Link MSD section) is not about defining=
 specific MSD types - it is about describing the generic encoding.

>=20
> However, the text also doesn't even use "Base MPLS Imposition MSD" to
> describe the MSD value here (it talks about this in later sections), so I=
'd say
> it's under-specified at this point.

[Les:] It would be inappropriate to discuss a specific MSD type in this gen=
eric description of the encoding.
Section 5 defines the one type this document specifies (BMI-MSD).

>=20
> Or is it in fact the case that you are saying that no matter what the MSD=
-Type
> is the MSD value will always be as defined currently in sections 2 and 3?
[Les:] Correct
> That's would be surprising enough that I think it would need to be made
> explicit.
>=20
[Les:] It is made explicit. Your expectation that this section is in any wa=
y specific to a particular MSD type is quite surprising.


> FWIW, I noticed this by doing a diff so here's the OSPF text:
>=20
>    "MSD Type 1 (IANA Section), MSD and the Value field contains the MSD
>    of the originating router.  Node MSD is a number in the range of
>    0-255. 0 represents lack of the ability to impose MSD stack of any
>    depth; any other value represents that of the node.  This value
>    SHOULD represent the minimum value supported by a node."
>=20
> That text looks a bit off too ("MSD and the Value field"?), but at least =
its
> saying the MSD type is "1".

[Les:] And it should not. OSPF draft section 5 define BMI-MSD - which is as=
signed codepoint 1.
The phrase " MSD Type 1 (IANA Section)" should be removed.

>=20
> Note: this comment refers to both the Node and Link sub-TLVs.
>=20
[Les:] On this we agree. :-)

> >> Issue: The OSPF version adds text about what to do in the presence of
> >> multiple instances of the same TLV. This highlighted the fact that
> >> the IS-IS draft doesn't do this, but also doesn't talk about there onl=
y being
> 1 allowed.
> >
> > [Les:] MSD inherits the procedures defined in
> https://tools.ietf.org/html/rfc7981#section-3 .
> >
> > There is therefore no need for further specification.
>=20
> Well that might cover the Node TLV, but not the Link TLV, right?
>=20
[Les:] OK - we can add text to cover this point as regards Link sub-TLV.

> > The meaning of "one allowed" is not the same in IS-IS. Clearly multiple=
 MSD
> sub-TLVs are allowed since there are 255 possible MSD types and they woul=
d
> not all fit into a single sub-TLV.
>=20
> The main point I'm making here is that the OSPF document goes out of it's
> way to be explicit about multiple values not being allowed, the IS-IS
> document leaves this unspecified.

[Les:] If you have a problem with this, please take it up in the context of=
 RFC 7981.
No one has objected to that definition and it has been in place since 2006.

   Les

>=20
> Thanks,
> Chris.
>=20
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr


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Subject: [Lsr] [IANA #1109980] Early Allocation Extension for "IS-IS Extensions for Segment Routing" - draft-ietf-isis-segment-routing-extensions-16.txt
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Hi Acee, 

We've sent the request below to the designated IS-IS experts. 

Best regards, 

Sabrina Tanamal
Senior IANA Services Specialist

On Tue May 15 17:12:25 2018, acee@cisco.com wrote:
> Hi Amanda, et al,
> 
> I just communicated with Les, one of the designated experts for the
> IS-IS TLV 242 registry, and the draft requires two additional Sub-TLV
> allocations:
> 
> Sub-TLV 22 for Segment Routing Local Block (SRLB)
> Sub-TLV 24 for Segment Routing Mapping Server (SRMS) Preference
> 
> Thanks,
> Acee
> 
> From: Acee Lindem 
> Date: Tuesday, May 15, 2018 at 10:54 AM
> To: IANA , Alvaro Retana 
> Cc: Christian Hopps , "lsr@ietf.org"
> , "draft-ietf-isis-segment-routing-extensions@ietf.org"
> , Uma Chunduri
> 
> Subject: Early Allocation Extension for "IS-IS Extensions for Segment
> Routing" - draft-ietf-isis-segment-routing-extensions-16.txt
> 
> Hi Amanda, et al IANA, Alvaro,
> 
> For a variety of reasons, we will not finish the subject draft by the
> end of June when the IANA allocations expire. It has just completed WG
> last call but there are many fastidious reviewers are in the path to
> completion. Please extend the allocations and add any that were not in
> the original early allocations. For example, we need the SRMS
> Preference allocated in the TLV 242 registry ASAP since we have early
> allocations to make in this registry.
> 
> Thanks,
> Acee




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From: "Acee Lindem (acee)" 
To: "iana-prot-param@iana.org" 
CC: "Les Ginsberg (ginsberg)" , "draft-ietf-isis-segment-routing-extensions@ietf.org" , "chopps@chopps.org" , "uma.chunduri@huawei.com" , "aretana.ietf@gmail.com" , "lsr@ietf.org" 
Thread-Topic: [Lsr] [IANA #1109980] Early Allocation Extension for "IS-IS Extensions for Segment Routing" - draft-ietf-isis-segment-routing-extensions-16.txt
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Subject: Re: [Lsr] [IANA #1109980] Early Allocation Extension for "IS-IS Extensions for Segment Routing" - draft-ietf-isis-segment-routing-extensions-16.txt
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CC: uma.chunduri@huawei.com, lsr@ietf.org, chopps@chopps.org, ginsberg@cisco.com, aretana.ietf@gmail.com, draft-ietf-isis-segment-routing-extensions@ietf.org
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Subject: [Lsr] [IANA #1109980] Early Allocation Extension for "IS-IS Extensions for Segment Routing" - draft-ietf-isis-segment-routing-extensions-16.txt
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Hi Acee, 

Since these allocations would be made through the IS-IS early allocation process defined in RFC 7370, rather than the process defined in RFC 7120, we only need the experts to approve. 

Thanks,
Sabrina

On Tue May 15 21:12:02 2018, acee@cisco.com wrote:
> Hi Sabrina,
> 
> Does Alvaro need to approve the allocations or solely the experts?
> 
> Thanks,
> Acee
> 
> On 5/15/18, 5:10 PM, "Lsr on behalf of Sabrina Tanamal via RT"  bounces@ietf.org on behalf of iana-prot-param@iana.org> wrote:
> 
> Hi Acee,
> 
> We've sent the request below to the designated IS-IS experts.
> 
> Best regards,
> 
> Sabrina Tanamal
> Senior IANA Services Specialist
> 
> On Tue May 15 17:12:25 2018, acee@cisco.com wrote:
> > Hi Amanda, et al,
> >
> > I just communicated with Les, one of the designated experts for the
> > IS-IS TLV 242 registry, and the draft requires two additional Sub-TLV
> > allocations:
> >
> > Sub-TLV 22 for Segment Routing Local Block (SRLB)
> > Sub-TLV 24 for Segment Routing Mapping Server (SRMS) Preference
> >
> > Thanks,
> > Acee
> >
> > From: Acee Lindem 
> > Date: Tuesday, May 15, 2018 at 10:54 AM
> > To: IANA , Alvaro Retana 
> > Cc: Christian Hopps , "lsr@ietf.org"
> > , "draft-ietf-isis-segment-routing-extensions@ietf.org"
> > , Uma Chunduri
> > 
> > Subject: Early Allocation Extension for "IS-IS Extensions for Segment
> > Routing" - draft-ietf-isis-segment-routing-extensions-16.txt
> >
> > Hi Amanda, et al IANA, Alvaro,
> >
> > For a variety of reasons, we will not finish the subject draft by the
> > end of June when the IANA allocations expire. It has just completed
> > WG
> > last call but there are many fastidious reviewers are in the path to
> > completion. Please extend the allocations and add any that were not
> > in
> > the original early allocations. For example, we need the SRMS
> > Preference allocated in the TLV 242 registry ASAP since we have early
> > allocations to make in this registry.
> >
> > Thanks,
> > Acee
> 
> 
> 
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr
> 
> 




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From: Christian Hopps 
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Subject: Re: [Lsr] I-D Action: draft-ietf-isis-segment-routing-msd-11.txt
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Les Ginsberg (ginsberg)  writes:

> Chris -
>
>> Or is it in fact the case that you are saying that no matter what the MSD-Type
>> is the MSD value will always be as defined currently in sections 2 and 3?

> [Les:] Correct

>> That's would be surprising enough that I think it would need to be made
>> explicit.

> [Les:] It is made explicit. Your expectation that this section is in any way specific to a particular MSD type is quite surprising.

Given the text in the OSPF document specifies the type, is the most recently updated of the 2 documents, and I've mentioned is the reason I'm bringing this discrepancy up, it is surprising that you find my surprise surprising. :)

Would you be amenable to change the text (and similarly the link section) to read,

    "The Node MSD value is a number in the range of 0-255. *Regardless of MSD type*, 0 represents lack of the ability to support SID stack of any depth; any other value represents that of the node. This value MUST represent the lowest value supported by any link configured for use by the advertising IS-IS instance."

Honestly, I don't know why you want to define such specific semantics (no subset of links ever?) for this and all future MSD types, but your more the expert on this technology and perhaps no other meaning for the values could ever make any sense.

>> FWIW, I noticed this by doing a diff so here's the OSPF text:
>>
>>    "MSD Type 1 (IANA Section), MSD and the Value field contains the MSD
>>    of the originating router.  Node MSD is a number in the range of
>>    0-255. 0 represents lack of the ability to impose MSD stack of any
>>    depth; any other value represents that of the node.  This value
>>    SHOULD represent the minimum value supported by a node."
>>
>> That text looks a bit off too ("MSD and the Value field"?), but at least its
>> saying the MSD type is "1".
>
> [Les:] And it should not. OSPF draft section 5 define BMI-MSD - which is assigned codepoint 1.
> The phrase " MSD Type 1 (IANA Section)" should be removed.

OK good then.

>> Note: this comment refers to both the Node and Link sub-TLVs.
>>
> [Les:] On this we agree. :-)
>
>> >> Issue: The OSPF version adds text about what to do in the presence of
>> >> multiple instances of the same TLV. This highlighted the fact that
>> >> the IS-IS draft doesn't do this, but also doesn't talk about there only being
>> 1 allowed.
>> >
>> > [Les:] MSD inherits the procedures defined in
>> https://tools.ietf.org/html/rfc7981#section-3 .
>> >
>> > There is therefore no need for further specification.
>>
>> Well that might cover the Node TLV, but not the Link TLV, right?
>>
> [Les:] OK - we can add text to cover this point as regards Link sub-TLV.
>
>> > The meaning of "one allowed" is not the same in IS-IS. Clearly multiple MSD
>> sub-TLVs are allowed since there are 255 possible MSD types and they would
>> not all fit into a single sub-TLV.
>>
>> The main point I'm making here is that the OSPF document goes out of it's
>> way to be explicit about multiple values not being allowed, the IS-IS
>> document leaves this unspecified.
>
> [Les:] If you have a problem with this, please take it up in the context of RFC 7981.
> No one has objected to that definition and it has been in place since 2006.

I did say that Node TLV was OK above so I'm not sure what further problem you think I might have with RFC 7981, in any case I don't. :)

Thanks,
Chris.

>    Les


From nobody Wed May 16 08:41:01 2018
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Subject: [Lsr] I-D Action: draft-ietf-isis-segment-routing-msd-12.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Link State Routing WG of the IETF.

        Title           : Signaling MSD (Maximum SID Depth) using IS-IS
        Authors         : Jeff Tantsura
                          Uma Chunduri
                          Sam Aldrin
                          Les Ginsberg
	Filename        : draft-ietf-isis-segment-routing-msd-12.txt
	Pages           : 9
	Date            : 2018-05-16

Abstract:
   This document defines a way for an IS-IS Router to advertise multiple
   types of supported Maximum SID Depths (MSDs) at node and/or link
   granularity.  Such advertisements allow entities (e.g., centralized
   controllers) to determine whether a particular SID stack can be
   supported in a given network.  This document only defines one type of
   MSD maximum label imposition, but defines an encoding that can
   support other MSD types.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-isis-segment-routing-msd/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-isis-segment-routing-msd-12
https://datatracker.ietf.org/doc/html/draft-ietf-isis-segment-routing-msd-12

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-isis-segment-routing-msd-12


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/


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From: "Les Ginsberg (ginsberg)" 
To: Christian Hopps 
CC: "lsr@ietf.org" , "Jeff Tantsura (jefftant.ietf@gmail.com)" 
Thread-Topic: [Lsr] I-D Action: draft-ietf-isis-segment-routing-msd-11.txt
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Chris -

V12 of the IS-IS Draft has just been posted. I believe this addresses your =
concerns.

In addition, Jeff and I have discussed and a new version of OSPF draft will=
 be posted shortly which:

1)Removes the confusing text in Sections 2 and 3.
2)References the registry which is defined in the IS-IS document.

WG chairs please do what is necessary when progressing the documents so tha=
t the registry creation and reference to it do not become blocking items.

I hope this addresses all issues you have raised - but if not be sure to le=
t us know. :-)

   Les


> -----Original Message-----
> From: Christian Hopps 
> Sent: Tuesday, May 15, 2018 3:09 PM
> To: Les Ginsberg (ginsberg) 
> Cc: Christian Hopps ; lsr@ietf.org
> Subject: Re: [Lsr] I-D Action: draft-ietf-isis-segment-routing-msd-11.txt
>=20
>=20
> Les Ginsberg (ginsberg)  writes:
>=20
> > Chris -
> >
> >> Or is it in fact the case that you are saying that no matter what the
> >> MSD-Type is the MSD value will always be as defined currently in secti=
ons
> 2 and 3?
>=20
> > [Les:] Correct
>=20
> >> That's would be surprising enough that I think it would need to be
> >> made explicit.
>=20
> > [Les:] It is made explicit. Your expectation that this section is in an=
y way
> specific to a particular MSD type is quite surprising.
>=20
> Given the text in the OSPF document specifies the type, is the most recen=
tly
> updated of the 2 documents, and I've mentioned is the reason I'm bringing
> this discrepancy up, it is surprising that you find my surprise surprisin=
g. :)
>=20
> Would you be amenable to change the text (and similarly the link section)=
 to
> read,
>=20
>     "The Node MSD value is a number in the range of 0-255. *Regardless of
> MSD type*, 0 represents lack of the ability to support SID stack of any d=
epth;
> any other value represents that of the node. This value MUST represent th=
e
> lowest value supported by any link configured for use by the advertising =
IS-IS
> instance."
>=20
> Honestly, I don't know why you want to define such specific semantics (no
> subset of links ever?) for this and all future MSD types, but your more t=
he
> expert on this technology and perhaps no other meaning for the values cou=
ld
> ever make any sense.
>=20
> >> FWIW, I noticed this by doing a diff so here's the OSPF text:
> >>
> >>    "MSD Type 1 (IANA Section), MSD and the Value field contains the MS=
D
> >>    of the originating router.  Node MSD is a number in the range of
> >>    0-255. 0 represents lack of the ability to impose MSD stack of any
> >>    depth; any other value represents that of the node.  This value
> >>    SHOULD represent the minimum value supported by a node."
> >>
> >> That text looks a bit off too ("MSD and the Value field"?), but at
> >> least its saying the MSD type is "1".
> >
> > [Les:] And it should not. OSPF draft section 5 define BMI-MSD - which i=
s
> assigned codepoint 1.
> > The phrase " MSD Type 1 (IANA Section)" should be removed.
>=20
> OK good then.
>=20
> >> Note: this comment refers to both the Node and Link sub-TLVs.
> >>
> > [Les:] On this we agree. :-)
> >
> >> >> Issue: The OSPF version adds text about what to do in the presence
> >> >> of multiple instances of the same TLV. This highlighted the fact
> >> >> that the IS-IS draft doesn't do this, but also doesn't talk about
> >> >> there only being
> >> 1 allowed.
> >> >
> >> > [Les:] MSD inherits the procedures defined in
> >> https://tools.ietf.org/html/rfc7981#section-3 .
> >> >
> >> > There is therefore no need for further specification.
> >>
> >> Well that might cover the Node TLV, but not the Link TLV, right?
> >>
> > [Les:] OK - we can add text to cover this point as regards Link sub-TLV=
.
> >
> >> > The meaning of "one allowed" is not the same in IS-IS. Clearly
> >> > multiple MSD
> >> sub-TLVs are allowed since there are 255 possible MSD types and they
> >> would not all fit into a single sub-TLV.
> >>
> >> The main point I'm making here is that the OSPF document goes out of
> >> it's way to be explicit about multiple values not being allowed, the
> >> IS-IS document leaves this unspecified.
> >
> > [Les:] If you have a problem with this, please take it up in the contex=
t of
> RFC 7981.
> > No one has objected to that definition and it has been in place since 2=
006.
>=20
> I did say that Node TLV was OK above so I'm not sure what further problem
> you think I might have with RFC 7981, in any case I don't. :)
>=20
> Thanks,
> Chris.
>=20
> >    Les


From nobody Thu May 17 03:18:29 2018
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Subject: [Lsr] I-D Action: draft-ietf-ospf-segment-routing-msd-13.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Link State Routing WG of the IETF.

        Title           : Signaling MSD (Maximum SID Depth) using OSPF
        Authors         : Jeff Tantsura
                          Uma Chunduri
                          Sam Aldrin
                          Peter Psenak
	Filename        : draft-ietf-ospf-segment-routing-msd-13.txt
	Pages           : 10
	Date            : 2018-05-17

Abstract:
   This document defines a way for an OSPF Router to advertise multiple
   types of supported Maximum SID Depths (MSDs) at node and/or link
   granularity.  Such advertisements allow entities (e.g., centralized
   controllers) to determine whether a particular SID stack can be
   supported in a given network.  This document defines only one type of
   MSD, but defines an encoding that can support other MSD types.  Here
   the term OSPF means both OSPFv2 and OSPFv3.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-ospf-segment-routing-msd/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-ospf-segment-routing-msd-13
https://datatracker.ietf.org/doc/html/draft-ietf-ospf-segment-routing-msd-13

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-ospf-segment-routing-msd-13


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/


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From nobody Thu May 17 14:07:29 2018
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From: Christian Hopps 
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Subject: [Lsr] Flex Algo merge work, IS-IS and OSPF FAD sub-TLVs
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So in looking at the IANA requests inside the newly merged flex =
algorithm draft I noticed that the document is creating 2 separate Flex =
Algorithm Definition sub-tlvs Registries for IS-IS and OSPF with the =
initial content described in sections:

6.1.  ISIS Flexible Algorithm Exclude Admin Group Sub-TLV
6.2.  ISIS Flexible Algorithm Include-Any Admin Group Sub-TLV
6.3.  ISIS Flexible Algorithm Include-All Admin Group Sub-TLV

7.1.  OSPF Flexible Algorithm Exclude Admin Group Sub-TLV
7.2.  OSPF Flexible Algorithm Include-Any Admin Group Sub-TLV
7.3.  OSPF Flexible Algorithm Include-All Admin Group Sub-TLV

They are basically the same thing (indeed the later OSPF sections refer =
back to the IS-IS sections), except for one detail AFAICT, the size of =
the type and length fields.

I think we may have some options here to make this a bit more elegant.

 1. Share the same sub-TLV structure
   a. using the OSPF sub-tlv structure (16 bit type and 16 bit len) for =
both protocols
   b. using the IS-IS sub-tlv structure (8 bit type and 8 bit len) for =
both protocols

 2. Use different structure with the same type field size of the
   a. more constrained IS-IS 8 bit size
   b. less constrained OSPF 16 bit size

 3. Define and use some generic method to define shared TLVs like this =
where the only actual difference is the size of the type and length =
fields.


1, Creates a clean and simple standard, 1 TLV definition and 1 sub-TLV =
registry.

1a, has the property that the length value in IS-IS can't normally =
exceed an 8 bit value; however, sub-TLV length values are already =
constrained beyond the field size as sub-TLVs may appear anywhere in the =
TLV.

1b, restricts both protocols to 256 types, and perhaps more importantly =
restricts the sub-TLV length to 257 octets. This is handled all the time =
in IS-IS using repeated TLVs, but not so much (ever?) in OSPF.


2. Allows us to at least create a single IANA registry for the sub-tlv =
types so we aren't duplicating them and their definitions for each =
protocol.


3. Is interesting but probably requires some work outside of this =
document.


This document is serving as our guinea pig for how to merge work so I =
think it's worth spending some effort on these types of details.

Thanks,
Chris.

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From: "Acee Lindem (acee)" 
To: Christian Hopps 
CC: "lsr@ietf.org" 
Thread-Topic: [Lsr] Flex Algo merge work, IS-IS and OSPF FAD sub-TLVs
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From: Alvaro Retana 
In-Reply-To: 
References: 
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Date: Fri, 18 May 2018 11:19:21 -0400
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To: "Acee Lindem (acee)" , IANA 
Cc: "lsr@ietf.org" 
Content-Type: multipart/alternative; boundary="000000000000fc7be7056c7c799b"
Archived-At: 
Subject: Re: [Lsr] Early Allocation Request for "IGP Flexible Algorithm"
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Hi!

This request is fine with me.

Acee:  yes, according to rfc7120, the AD has to approve early allocation
requests for =E2=80=9CIETF Review=E2=80=9D registries.

Alvaro.


On May 17, 2018 at 4:15:48 PM, Acee Lindem (acee) (acee@cisco.com) wrote:

The authors of the subject document have requested early assignment for the
subject draft - https://datatracker.ietf.org/doc/draft-ietf-lsr-flex-algo/



The draft is now a working document and we believe the early allocations
should be made to facilitate implementation.



Alvaro =E2=80=93 do you need to approve the assignment in the OSPF RI LSA T=
LV
registry since the assignment policy is =E2=80=9CIETF Review=E2=80=9D?



Thanks,

Acee

--000000000000fc7be7056c7c799b
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=

        Hi!

        This request is fine w=
ith me.

        Acee=
: =C2=A0yes, according to rfc7120, the AD has to approve early allocation r=
equests for =E2=80=9CIETF Review=E2=80=9D registries.

        Alvaro.


        O=
n May 17, 2018 at 4:15:48 PM, Acee Lindem (acee) (acee@cisco.com) wrote:
         
        







        

        The authors of the subject document have requested e=
arly assignment for the subject draft -
http=
s://datatracker.ietf.org/doc/draft-ietf-lsr-flex-algo/
        

        =C2=A0
        

        The draft is now a working document and we believe t=
he early allocations should be made to facilitate implementation.=C2=A0

        

        =C2=A0
        

        Alvaro =E2=80=93 do you need to approve the assignme=
nt in the OSPF RI LSA TLV registry since the assignment policy is =E2=80=9C=
IETF Review=E2=80=9D?

        

        =C2=A0
        

        Thanks,
        

        Acee 
        

        



         
        

--000000000000fc7be7056c7c799b--


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From: Christian Hopps 
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Subject: Re: [Lsr] Flex Algo merge work, IS-IS and OSPF FAD sub-TLVs
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To clarify, I think the win here is with clear and concise =
specifications, and avoiding double definitions of what is supposed to =
be the same thing -- not shared TLV parsing code. :)

There's actually nothing sub-optimal encoding-wise with option 2a or 2b. =
The drawback with option 2 is we have 2 different TLV structures, the =
registry can be shared though.

Thanks,
Chris.

> On May 18, 2018, at 10:29 AM, Acee Lindem (acee)  =
wrote:
>=20
> Hi Chris,
>=20
> Somehow, I lost the mail below and was only able to retrieve it from =
the archive. Pardon my top posting.
>=20
> While I believe that sharing code points for values, e.g., IGP =
Algorithm Type, is a good idea, I don=E2=80=99t necessarily think it is =
a good idea to merge the TLV type registries. It seems to me it would be =
a poor trade-off to impact optimal protocol encoding including =
implementation just so we can have a combined IANA registry. It is =
extremely unlikely that OSPF and IS-IS implementations will ever share a =
common TLV parsing library.
>=20
> Note that we did discuss this once before in the context of the OSPF =
and IS-IS Tunnel Encapsulation drafts. I'd appreciate hearing what other =
WG members feel with respect to this issue.
>=20
> Thanks,
> Acee
>=20
>=20
>=20
>=20
>=20
>=20
> Christian Hopps  Thu, 17 May 2018 21:07 UTC
>=20
> So in looking at the IANA requests inside the newly merged flex =
algorithm draft I noticed that the document is creating 2 separate Flex =
Algorithm Definition sub-tlvs Registries for IS-IS and OSPF with the =
initial content described in sections:
>=20
> 6.1.  ISIS Flexible Algorithm Exclude Admin Group Sub-TLV
> 6.2.  ISIS Flexible Algorithm Include-Any Admin Group Sub-TLV
> 6.3.  ISIS Flexible Algorithm Include-All Admin Group Sub-TLV
>=20
> 7.1.  OSPF Flexible Algorithm Exclude Admin Group Sub-TLV
> 7.2.  OSPF Flexible Algorithm Include-Any Admin Group Sub-TLV
> 7.3.  OSPF Flexible Algorithm Include-All Admin Group Sub-TLV
>=20
> They are basically the same thing (indeed the later OSPF sections =
refer back to the IS-IS sections), except for one detail AFAICT, the =
size of the type and length fields.
>=20
> I think we may have some options here to make this a bit more elegant.
>=20
> 1. Share the same sub-TLV structure
>   a. using the OSPF sub-tlv structure (16 bit type and 16 bit len) for =
both protocols
>   b. using the IS-IS sub-tlv structure (8 bit type and 8 bit len) for =
both protocols
>=20
> 2. Use different structure with the same type field size of the
>   a. more constrained IS-IS 8 bit size
>   b. less constrained OSPF 16 bit size
>=20
> 3. Define and use some generic method to define shared TLVs like this =
where the only actual difference is the size of the type and length =
fields.
>=20
>=20
> 1, Creates a clean and simple standard, 1 TLV definition and 1 sub-TLV =
registry.
>=20
> 1a, has the property that the length value in IS-IS can't normally =
exceed an 8 bit value; however, sub-TLV length values are already =
constrained beyond the field size as sub-TLVs may appear anywhere in the =
TLV.
>=20
> 1b, restricts both protocols to 256 types, and perhaps more =
importantly restricts the sub-TLV length to 257 octets. This is handled =
all the time in IS-IS using repeated TLVs, but not so much (ever?) in =
OSPF.
>=20
>=20
> 2. Allows us to at least create a single IANA registry for the sub-tlv =
types so we aren't duplicating them and their definitions for each =
protocol.
>=20
>=20
> 3. Is interesting but probably requires some work outside of this =
document.
>=20
>=20
> This document is serving as our guinea pig for how to merge work so I =
think it's worth spending some effort on these types of details.
>=20
> Thanks,
> Chris.
>=20


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From: "Acee Lindem (acee)" 
To: Alvaro Retana , IANA 
CC: "lsr@ietf.org" 
Thread-Topic: Early Allocation Request for "IGP Flexible Algorithm"
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Date: Fri, 18 May 2018 15:21:19 +0000
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Subject: Re: [Lsr] Early Allocation Request for "IGP Flexible Algorithm"
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From: Christian Hopps 
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Date: Fri, 18 May 2018 11:20:50 -0400
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Subject: Re: [Lsr] Flex Algo merge work, IS-IS and OSPF FAD sub-TLVs
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[resending w/o gpg signature]

To clarify, I think the win here is with clear and concise =
specifications, and avoiding double definitions of what is supposed to =
be the same thing -- not shared TLV parsing code. :)

There's actually nothing sub-optimal encoding-wise with option 2a or 2b. =
The drawback with option 2 is we have 2 different TLV structures, the =
registry can be shared though.

Thanks,
Chris.

> On May 18, 2018, at 10:29 AM, Acee Lindem (acee)  =
wrote:
>=20
> Hi Chris,
>=20
> Somehow, I lost the mail below and was only able to retrieve it from =
the archive. Pardon my top posting.
>=20
> While I believe that sharing code points for values, e.g., IGP =
Algorithm Type, is a good idea, I don=E2=80=99t necessarily think it is =
a good idea to merge the TLV type registries. It seems to me it would be =
a poor trade-off to impact optimal protocol encoding including =
implementation just so we can have a combined IANA registry. It is =
extremely unlikely that OSPF and IS-IS implementations will ever share a =
common TLV parsing library.
>=20
> Note that we did discuss this once before in the context of the OSPF =
and IS-IS Tunnel Encapsulation drafts. I'd appreciate hearing what other =
WG members feel with respect to this issue.
>=20
> Thanks,
> Acee
>=20
>=20
>=20
>=20
>=20
>=20
> Christian Hopps  Thu, 17 May 2018 21:07 UTC
>=20
> So in looking at the IANA requests inside the newly merged flex =
algorithm draft I noticed that the document is creating 2 separate Flex =
Algorithm Definition sub-tlvs Registries for IS-IS and OSPF with the =
initial content described in sections:
>=20
> 6.1.  ISIS Flexible Algorithm Exclude Admin Group Sub-TLV
> 6.2.  ISIS Flexible Algorithm Include-Any Admin Group Sub-TLV
> 6.3.  ISIS Flexible Algorithm Include-All Admin Group Sub-TLV
>=20
> 7.1.  OSPF Flexible Algorithm Exclude Admin Group Sub-TLV
> 7.2.  OSPF Flexible Algorithm Include-Any Admin Group Sub-TLV
> 7.3.  OSPF Flexible Algorithm Include-All Admin Group Sub-TLV
>=20
> They are basically the same thing (indeed the later OSPF sections =
refer back to the IS-IS sections), except for one detail AFAICT, the =
size of the type and length fields.
>=20
> I think we may have some options here to make this a bit more elegant.
>=20
> 1. Share the same sub-TLV structure
>  a. using the OSPF sub-tlv structure (16 bit type and 16 bit len) for =
both protocols
>  b. using the IS-IS sub-tlv structure (8 bit type and 8 bit len) for =
both protocols
>=20
> 2. Use different structure with the same type field size of the
>  a. more constrained IS-IS 8 bit size
>  b. less constrained OSPF 16 bit size
>=20
> 3. Define and use some generic method to define shared TLVs like this =
where the only actual difference is the size of the type and length =
fields.
>=20
>=20
> 1, Creates a clean and simple standard, 1 TLV definition and 1 sub-TLV =
registry.
>=20
> 1a, has the property that the length value in IS-IS can't normally =
exceed an 8 bit value; however, sub-TLV length values are already =
constrained beyond the field size as sub-TLVs may appear anywhere in the =
TLV.
>=20
> 1b, restricts both protocols to 256 types, and perhaps more =
importantly restricts the sub-TLV length to 257 octets. This is handled =
all the time in IS-IS using repeated TLVs, but not so much (ever?) in =
OSPF.
>=20
>=20
> 2. Allows us to at least create a single IANA registry for the sub-tlv =
types so we aren't duplicating them and their definitions for each =
protocol.
>=20
>=20
> 3. Is interesting but probably requires some work outside of this =
document.
>=20
>=20
> This document is serving as our guinea pig for how to merge work so I =
think it's worth spending some effort on these types of details.
>=20
> Thanks,
> Chris.
>=20

_______________________________________________
Lsr mailing list
Lsr@ietf.org
https://www.ietf.org/mailman/listinfo/lsr


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From: "Les Ginsberg (ginsberg)" 
To: "Acee Lindem (acee)" , Christian Hopps 
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Thread-Topic: [Lsr]  Flex Algo merge work, IS-IS and OSPF FAD sub-TLVs
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From: "Acee Lindem (acee)" 
To: Christian Hopps 
CC: "lsr@ietf.org" 
Thread-Topic: [Lsr] Flex Algo merge work, IS-IS and OSPF FAD sub-TLVs
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Date: Fri, 18 May 2018 15:45:29 +0000
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Subject: Re: [Lsr] Flex Algo merge work, IS-IS and OSPF FAD sub-TLVs
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Date: Fri, 18 May 2018 18:12:38 +0200
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To: "Acee Lindem (acee)" , Christian Hopps 
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Subject: Re: [Lsr] Flex Algo merge work, IS-IS and OSPF FAD sub-TLVs
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Hi Chris, Acee,

On 18/05/18 17:45 , Acee Lindem (acee) wrote:
>
>
>> On May 18, 2018, at 11:20 AM, Christian Hopps  wrote:
>>
>> To clarify, I think the win here is with clear and concise specifications, and avoiding double definitions of what is supposed to be the same thing -- not shared TLV parsing code. :)
>
> I think this can be accomplished without a single IANA registry. It is all a matter of how the draft is written.

I'm all for making it better, but we should not overdo it.

ISIS and OSPF TLVs are never really the same due to basic TLV header 
difference. OSPF TLVs are always padded to 4-octet alignment, while ISIS 
ones are not. Having a common definition for both given these 
differences would be messy IMHO.

thanks,
Peter


>
>>
>> There's actually nothing sub-optimal encoding-wise with option 2a or 2b. The drawback with option 2 is we have 2 different TLV structures, the registry can be shared though.
>
> I don’t think 2b is an option since it increases the IS-IS type/length size. 2a would be viable but by the time you documented all the constraints and what OSPF should do if they weren’t followed, you’d have negated any benefit.
>
> If the WG really wants protocol convergence, everyone should move to OSPFv3 since it has all the advantages of both protocols. ;^)
>
> Thanks,
> Acee
>
>
>>
>> Thanks,
>> Chris.
>>
>>> On May 18, 2018, at 10:29 AM, Acee Lindem (acee)  wrote:
>>>
>>> Hi Chris,
>>>
>>> Somehow, I lost the mail below and was only able to retrieve it from the archive. Pardon my top posting.
>>>
>>> While I believe that sharing code points for values, e.g., IGP Algorithm Type, is a good idea, I don’t necessarily think it is a good idea to merge the TLV type registries. It seems to me it would be a poor trade-off to impact optimal protocol encoding including implementation just so we can have a combined IANA registry. It is extremely unlikely that OSPF and IS-IS implementations will ever share a common TLV parsing library.
>>>
>>> Note that we did discuss this once before in the context of the OSPF and IS-IS Tunnel Encapsulation drafts. I'd appreciate hearing what other WG members feel with respect to this issue.
>>>
>>> Thanks,
>>> Acee
>>>
>>>
>>>
>>>
>>>
>>>
>>> Christian Hopps  Thu, 17 May 2018 21:07 UTC
>>>
>>> So in looking at the IANA requests inside the newly merged flex algorithm draft I noticed that the document is creating 2 separate Flex Algorithm Definition sub-tlvs Registries for IS-IS and OSPF with the initial content described in sections:
>>>
>>> 6.1.  ISIS Flexible Algorithm Exclude Admin Group Sub-TLV
>>> 6.2.  ISIS Flexible Algorithm Include-Any Admin Group Sub-TLV
>>> 6.3.  ISIS Flexible Algorithm Include-All Admin Group Sub-TLV
>>>
>>> 7.1.  OSPF Flexible Algorithm Exclude Admin Group Sub-TLV
>>> 7.2.  OSPF Flexible Algorithm Include-Any Admin Group Sub-TLV
>>> 7.3.  OSPF Flexible Algorithm Include-All Admin Group Sub-TLV
>>>
>>> They are basically the same thing (indeed the later OSPF sections refer back to the IS-IS sections), except for one detail AFAICT, the size of the type and length fields.
>>>
>>> I think we may have some options here to make this a bit more elegant.
>>>
>>> 1. Share the same sub-TLV structure
>>>   a. using the OSPF sub-tlv structure (16 bit type and 16 bit len) for both protocols
>>>   b. using the IS-IS sub-tlv structure (8 bit type and 8 bit len) for both protocols
>>>
>>> 2. Use different structure with the same type field size of the
>>>   a. more constrained IS-IS 8 bit size
>>>   b. less constrained OSPF 16 bit size
>>>
>>> 3. Define and use some generic method to define shared TLVs like this where the only actual difference is the size of the type and length fields.
>>>
>>>
>>> 1, Creates a clean and simple standard, 1 TLV definition and 1 sub-TLV registry.
>>>
>>> 1a, has the property that the length value in IS-IS can't normally exceed an 8 bit value; however, sub-TLV length values are already constrained beyond the field size as sub-TLVs may appear anywhere in the TLV.
>>>
>>> 1b, restricts both protocols to 256 types, and perhaps more importantly restricts the sub-TLV length to 257 octets. This is handled all the time in IS-IS using repeated TLVs, but not so much (ever?) in OSPF.
>>>
>>>
>>> 2. Allows us to at least create a single IANA registry for the sub-tlv types so we aren't duplicating them and their definitions for each protocol.
>>>
>>>
>>> 3. Is interesting but probably requires some work outside of this document.
>>>
>>>
>>> This document is serving as our guinea pig for how to merge work so I think it's worth spending some effort on these types of details.
>>>
>>> Thanks,
>>> Chris.
>>>
>>
>
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr
>


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Subject: Re: [Lsr] Flex Algo merge work, IS-IS and OSPF FAD sub-TLVs
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> On May 18, 2018, at 11:45 AM, Acee Lindem (acee)  =
wrote:
>> There's actually nothing sub-optimal encoding-wise with option 2a or =
2b. The drawback with option 2 is we have 2 different TLV structures, =
the registry can be shared though.
>=20
> I don=E2=80=99t think 2b is an option since it increases the IS-IS =
type/length size. 2a would be viable but by the time you documented all =
the constraints and what OSPF should do if they weren=E2=80=99t =
followed, you=E2=80=99d have negated any benefit.

Perhaps it was not-obvious but option 2 is only adjusting the type =
field. The length field would remain as it is for each protocol, and =
thus there's no issues with documenting new ways of handling TLVs for =
either protocol, just a way to share the sub-tlv registries. It's really =
the most simple option.

Thanks,
Chris.

>=20
>=20
> If the WG really wants protocol convergence, everyone should move to =
OSPFv3 since it has all the advantages of both protocols. ;^)
>=20
> Thanks,
> Acee
>=20
>=20
>>=20
>> Thanks,
>> Chris.
>>=20
>>> On May 18, 2018, at 10:29 AM, Acee Lindem (acee)  =
wrote:
>>>=20
>>> Hi Chris,
>>>=20
>>> Somehow, I lost the mail below and was only able to retrieve it from =
the archive. Pardon my top posting.
>>>=20
>>> While I believe that sharing code points for values, e.g., IGP =
Algorithm Type, is a good idea, I don=E2=80=99t necessarily think it is =
a good idea to merge the TLV type registries. It seems to me it would be =
a poor trade-off to impact optimal protocol encoding including =
implementation just so we can have a combined IANA registry. It is =
extremely unlikely that OSPF and IS-IS implementations will ever share a =
common TLV parsing library.
>>>=20
>>> Note that we did discuss this once before in the context of the OSPF =
and IS-IS Tunnel Encapsulation drafts. I'd appreciate hearing what other =
WG members feel with respect to this issue.
>>>=20
>>> Thanks,
>>> Acee
>>>=20
>>>=20
>>>=20
>>>=20
>>>=20
>>>=20
>>> Christian Hopps  Thu, 17 May 2018 21:07 UTC
>>>=20
>>> So in looking at the IANA requests inside the newly merged flex =
algorithm draft I noticed that the document is creating 2 separate Flex =
Algorithm Definition sub-tlvs Registries for IS-IS and OSPF with the =
initial content described in sections:
>>>=20
>>> 6.1.  ISIS Flexible Algorithm Exclude Admin Group Sub-TLV
>>> 6.2.  ISIS Flexible Algorithm Include-Any Admin Group Sub-TLV
>>> 6.3.  ISIS Flexible Algorithm Include-All Admin Group Sub-TLV
>>>=20
>>> 7.1.  OSPF Flexible Algorithm Exclude Admin Group Sub-TLV
>>> 7.2.  OSPF Flexible Algorithm Include-Any Admin Group Sub-TLV
>>> 7.3.  OSPF Flexible Algorithm Include-All Admin Group Sub-TLV
>>>=20
>>> They are basically the same thing (indeed the later OSPF sections =
refer back to the IS-IS sections), except for one detail AFAICT, the =
size of the type and length fields.
>>>=20
>>> I think we may have some options here to make this a bit more =
elegant.
>>>=20
>>> 1. Share the same sub-TLV structure
>>> a. using the OSPF sub-tlv structure (16 bit type and 16 bit len) for =
both protocols
>>> b. using the IS-IS sub-tlv structure (8 bit type and 8 bit len) for =
both protocols
>>>=20
>>> 2. Use different structure with the same type field size of the
>>> a. more constrained IS-IS 8 bit size
>>> b. less constrained OSPF 16 bit size
>>>=20
>>> 3. Define and use some generic method to define shared TLVs like =
this where the only actual difference is the size of the type and length =
fields.
>>>=20
>>>=20
>>> 1, Creates a clean and simple standard, 1 TLV definition and 1 =
sub-TLV registry.
>>>=20
>>> 1a, has the property that the length value in IS-IS can't normally =
exceed an 8 bit value; however, sub-TLV length values are already =
constrained beyond the field size as sub-TLVs may appear anywhere in the =
TLV.
>>>=20
>>> 1b, restricts both protocols to 256 types, and perhaps more =
importantly restricts the sub-TLV length to 257 octets. This is handled =
all the time in IS-IS using repeated TLVs, but not so much (ever?) in =
OSPF.
>>>=20
>>>=20
>>> 2. Allows us to at least create a single IANA registry for the =
sub-tlv types so we aren't duplicating them and their definitions for =
each protocol.
>>>=20
>>>=20
>>> 3. Is interesting but probably requires some work outside of this =
document.
>>>=20
>>>=20
>>> This document is serving as our guinea pig for how to merge work so =
I think it's worth spending some effort on these types of details.
>>>=20
>>> Thanks,
>>> Chris.
>>>=20
>>=20
>=20


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From nobody Sat May 19 06:15:36 2018
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From: Christian Hopps 
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Date: Sat, 19 May 2018 09:15:27 -0400
Cc: "Acee Lindem (acee)" , "lsr@ietf.org" 
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To: "Les Ginsberg (ginsberg)" 
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Subject: Re: [Lsr] Flex Algo merge work, IS-IS and OSPF FAD sub-TLVs
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Hi Les,

It feels like your response is perhaps reading more into my suggestion =
than was intended. I was in no way suggesting we go back and start =
combining TLV registries, or that future registries needed to be =
combined unnecessarily.

I'm looking at this particular case where we have 2 copies of the same =
[sub-]sub-TLV registry that we will be creating as the document is =
written. The OSPF definitions for the sub-TLV types are exactly the same =
as the IS-IS sub-sub-TLVs ones. In fact option 2 keeps the containing =
[sub-]TLV separate and only the [sub-]sub-TLV space is combined.

Isn't it better to define something once and refer to that single =
definition? This is the motivation that led us to combining the =
documents in the first place, and so I'm simply wondering if we can =
benefit more from this same treatment.

Thanks,
Chris.

P.S WRT type field length of [sub-]sub-TLVs. We are *defining* the value =
content, so of course we can do whatever we want and no documents about =
other [sub-]TLV values, types or field lengths actually applies unless =
we wish it to.

P.P.S. WRT scoping. The document defines an IS-IS sub-TLV which is =
scoped to the IS-IS Router Capability TLV (242) and defines an OSPF TLV =
which is scoped to the Router Information LSA. I think these are fairly =
analogous, or at least can be treated as such for [sub-]sub-TLV =
definitions. In fact section 5.3 treats them as equal for defining their =
use. I don't put this above b/c it's not something I want to distract =
from the general discussion and sharing the FAD [sub-]TLV was only =
option 1 of a list.


> On May 18, 2018, at 11:41 AM, Les Ginsberg (ginsberg) =
 wrote:
>=20
> (I never saw Chris's original email either - perhaps it was sent =
during the period when delivery to the alias when compromised.)
>=20
> I am in full agreement w Acee - it is a VERY BAD idea to try to =
combine protocol TLV registries.
> There are many reasons for this - here are a few.
>=20
> 1)In IS-IS the scope of TLV type identifiers is the protocol - in OSPF =
it is the LSA type
>=20
> 2)There are (obviously) many legacy code points which will make =
consistency at best confusing
>=20
> 3)Imposing an 8 bit type on OSPF or a 16 bit type on IS-IS is simply a =
non-starter.  RFC 7356 defines a non-backwards compatible way of doing =
this for IS-IS - but does so in a way that preserves the legacy =
codepoints - which seems obviously necessary. And introducing a 16 bit =
length into IS-IS isn't sensible unless we also address the current 256 =
LSP number limitation (which RFC 7356 also does). Suggesting this can be =
usefully done in a backwards compatible way does not make sense to me.
> I cannot imagine why OSPF would be motivated to move to a more =
restricted 8 bit type/length model.
>=20
> I cannot support this suggestion.
>=20
>   Les
>=20
>=20
>> -----Original Message-----
>> From: Lsr  On Behalf Of Acee Lindem (acee)
>> Sent: Friday, May 18, 2018 7:29 AM
>> To: Christian Hopps 
>> Cc: lsr@ietf.org
>> Subject: [Lsr] Flex Algo merge work, IS-IS and OSPF FAD sub-TLVs
>>=20
>> Hi Chris,
>>=20
>> Somehow, I lost the mail below and was only able to retrieve it from =
the
>> archive. Pardon my top posting.
>>=20
>> While I believe that sharing code points for values, e.g., IGP =
Algorithm Type,
>> is a good idea, I don=E2=80=99t necessarily think it is a good idea =
to merge the TLV type
>> registries. It seems to me it would be a poor trade-off to impact =
optimal
>> protocol encoding including implementation just so we can have a =
combined
>> IANA registry. It is extremely unlikely that OSPF and IS-IS =
implementations
>> will ever share a common TLV parsing library.
>>=20
>> Note that we did discuss this once before in the context of the OSPF =
and IS-
>> IS Tunnel Encapsulation drafts. I'd appreciate hearing what other WG
>> members feel with respect to this issue.
>>=20
>> Thanks,
>> Acee
>>=20
>>=20
>>=20
>>=20
>>=20
>>=20
>> Christian Hopps  Thu, 17 May 2018 21:07 UTC
>>=20
>> So in looking at the IANA requests inside the newly merged flex =
algorithm
>> draft I noticed that the document is creating 2 separate Flex =
Algorithm
>> Definition sub-tlvs Registries for IS-IS and OSPF with the initial =
content
>> described in sections:
>>=20
>> 6.1.  ISIS Flexible Algorithm Exclude Admin Group Sub-TLV 6.2.  ISIS =
Flexible
>> Algorithm Include-Any Admin Group Sub-TLV 6.3.  ISIS Flexible =
Algorithm
>> Include-All Admin Group Sub-TLV
>>=20
>> 7.1.  OSPF Flexible Algorithm Exclude Admin Group Sub-TLV 7.2.  OSPF
>> Flexible Algorithm Include-Any Admin Group Sub-TLV 7.3.  OSPF =
Flexible
>> Algorithm Include-All Admin Group Sub-TLV
>>=20
>> They are basically the same thing (indeed the later OSPF sections =
refer back
>> to the IS-IS sections), except for one detail AFAICT, the size of the =
type and
>> length fields.
>>=20
>> I think we may have some options here to make this a bit more =
elegant.
>>=20
>> 1. Share the same sub-TLV structure
>>   a. using the OSPF sub-tlv structure (16 bit type and 16 bit len) =
for both
>> protocols
>>   b. using the IS-IS sub-tlv structure (8 bit type and 8 bit len) for =
both
>> protocols
>>=20
>> 2. Use different structure with the same type field size of the
>>   a. more constrained IS-IS 8 bit size
>>   b. less constrained OSPF 16 bit size
>>=20
>> 3. Define and use some generic method to define shared TLVs like this
>> where the only actual difference is the size of the type and length =
fields.
>>=20
>>=20
>> 1, Creates a clean and simple standard, 1 TLV definition and 1 =
sub-TLV
>> registry.
>>=20
>> 1a, has the property that the length value in IS-IS can't normally =
exceed an 8
>> bit value; however, sub-TLV length values are already constrained =
beyond
>> the field size as sub-TLVs may appear anywhere in the TLV.
>>=20
>> 1b, restricts both protocols to 256 types, and perhaps more =
importantly
>> restricts the sub-TLV length to 257 octets. This is handled all the =
time in IS-IS
>> using repeated TLVs, but not so much (ever?) in OSPF.
>>=20
>>=20
>> 2. Allows us to at least create a single IANA registry for the =
sub-tlv types so
>> we aren't duplicating them and their definitions for each protocol.
>>=20
>>=20
>> 3. Is interesting but probably requires some work outside of this =
document.
>>=20
>>=20
>> This document is serving as our guinea pig for how to merge work so I =
think
>> it's worth spending some effort on these types of details.
>>=20
>> Thanks,
>> Chris.
>>=20
>> _______________________________________________
>> Lsr mailing list
>> Lsr@ietf.org
>> https://www.ietf.org/mailman/listinfo/lsr


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From: "Les Ginsberg (ginsberg)" 
To: Christian Hopps 
CC: "Acee Lindem (acee)" , "lsr@ietf.org" 
Thread-Topic: [Lsr]  Flex Algo merge work, IS-IS and OSPF FAD sub-TLVs
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From: Christian Hopps 
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Date: Sat, 19 May 2018 19:47:35 -0400
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To: "Les Ginsberg (ginsberg)" 
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Subject: Re: [Lsr] Flex Algo merge work, IS-IS and OSPF FAD sub-TLVs
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> On May 19, 2018, at 12:27 PM, Les Ginsberg (ginsberg) =
 wrote:

First, please understand that my intent is to have a discussion on the =
subject of when (and when not) to use common definitions. Just because I =
enumerated a bunch of ways that that might be accomplished does not mean =
that I am advocating for all of them or any one in particular. I bet =
that we agree on many of the options not being the right way, but I =
wanted to list all the ways I could imagine doing this so that we as a =
group could consider them during the discussion.

> Chris -
...
> As we often say "this is software - we can do anything" but please =
tell me WHY this is a good thing?
> So far the only argument seems to be that you think this make the =
draft "easier to read" - which begs the question as to whether in this =
particular case the current form of the draft (protocol specific =
encoding sections) is hard to read. It isn=E2=80=99t for me.

I don't agree with the paraphrasing "easier to read". I'm saying that =
it's better to define a thing in one place rather than in define it =
repeatedly in multiple places. Again this is why we have a combined =
document, right?

Ah, I see where we may not be understanding each other. I am thinking =
much more about the duplicate IANA registries, not about using 2 =
sections vs. 1 section in the combined document. The registries we are =
talking about are literally copies and I'd like to not have 2 IANA =
registries to document the same thing.=20

> I really think you are extending the "combine the WGs" idea beyond =
where it should reasonably go.
> It has never been a goal to combine the protocols - and once you start =
straying into trying to combine descriptions of protocol specific =
encoding I think that is exactly what you are trying to do - even if =
only in a modest way.

That seems like a reasonable way to think about how far we should or =
shouldn't go. So how strict would you say your view is on this "rule"? =
Is it never appropriate to make any compromise on encoding in order to =
be able to share, or is it just this case that you find "too much for =
too little"?

> We have already defined combined registries in those cases where we =
are defining an attribute value that is the same for both protocols =
e.g., IGP algorithm and MSD.
> But trying to extend that and combine the description of the protocol =
specific encoding isn=E2=80=99t appropriate or desirable.

I agree! IGP algorithm is a great example, and I'm glad you agree that =
it was a good idea. The content of the "Sub-TLVs of the FAD TLV" are in =
the same way shared by both protocols. The types and the values are =
defined exactly the same for both protocols. The *only* difference is =
the encoding of the type (and length) value, the semantics are the same.

So again, is there a more elegant way to define and document that shared =
semantic in one place?

How about an option 2c

  2c: Leave the encodings the way they are, and use a common registry to =
define the type/value semantics.

Thanks,
Chris.

>   Les
>=20
>=20
>> -----Original Message-----
>> From: Christian Hopps 
>> Sent: Saturday, May 19, 2018 6:15 AM
>> To: Les Ginsberg (ginsberg) 
>> Cc: Acee Lindem (acee) ; lsr@ietf.org
>> Subject: Re: [Lsr] Flex Algo merge work, IS-IS and OSPF FAD sub-TLVs
>>=20
>> Hi Les,
>>=20
>> It feels like your response is perhaps reading more into my =
suggestion than
>> was intended. I was in no way suggesting we go back and start =
combining TLV
>> registries, or that future registries needed to be combined =
unnecessarily.
>>=20
>> I'm looking at this particular case where we have 2 copies of the =
same [sub-
>> ]sub-TLV registry that we will be creating as the document is =
written. The
>> OSPF definitions for the sub-TLV types are exactly the same as the =
IS-IS sub-
>> sub-TLVs ones. In fact option 2 keeps the containing [sub-]TLV =
separate and
>> only the [sub-]sub-TLV space is combined.
>>=20
>> Isn't it better to define something once and refer to that single =
definition?
>> This is the motivation that led us to combining the documents in the =
first
>> place, and so I'm simply wondering if we can benefit more from this =
same
>> treatment.
>>=20
>> Thanks,
>> Chris.
>>=20
>> P.S WRT type field length of [sub-]sub-TLVs. We are *defining* the =
value
>> content, so of course we can do whatever we want and no documents =
about
>> other [sub-]TLV values, types or field lengths actually applies =
unless we wish
>> it to.
>>=20
>> P.P.S. WRT scoping. The document defines an IS-IS sub-TLV which is =
scoped
>> to the IS-IS Router Capability TLV (242) and defines an OSPF TLV =
which is
>> scoped to the Router Information LSA. I think these are fairly =
analogous, or at
>> least can be treated as such for [sub-]sub-TLV definitions. In fact =
section 5.3
>> treats them as equal for defining their use. I don't put this above =
b/c it's not
>> something I want to distract from the general discussion and sharing =
the FAD
>> [sub-]TLV was only option 1 of a list.
>>=20
>>=20
>>> On May 18, 2018, at 11:41 AM, Les Ginsberg (ginsberg)
>>  wrote:
>>>=20
>>> (I never saw Chris's original email either - perhaps it was sent
>>> during the period when delivery to the alias when compromised.)
>>>=20
>>> I am in full agreement w Acee - it is a VERY BAD idea to try to =
combine
>> protocol TLV registries.
>>> There are many reasons for this - here are a few.
>>>=20
>>> 1)In IS-IS the scope of TLV type identifiers is the protocol - in =
OSPF
>>> it is the LSA type
>>>=20
>>> 2)There are (obviously) many legacy code points which will make
>>> consistency at best confusing
>>>=20
>>> 3)Imposing an 8 bit type on OSPF or a 16 bit type on IS-IS is simply =
a non-
>> starter.  RFC 7356 defines a non-backwards compatible way of doing =
this for
>> IS-IS - but does so in a way that preserves the legacy codepoints - =
which
>> seems obviously necessary. And introducing a 16 bit length into IS-IS =
isn't
>> sensible unless we also address the current 256 LSP number limitation =
(which
>> RFC 7356 also does). Suggesting this can be usefully done in a =
backwards
>> compatible way does not make sense to me.
>>> I cannot imagine why OSPF would be motivated to move to a more
>> restricted 8 bit type/length model.
>>>=20
>>> I cannot support this suggestion.
>>>=20
>>>  Les
>>>=20
>>>=20
>>>> -----Original Message-----
>>>> From: Lsr  On Behalf Of Acee Lindem (acee)
>>>> Sent: Friday, May 18, 2018 7:29 AM
>>>> To: Christian Hopps 
>>>> Cc: lsr@ietf.org
>>>> Subject: [Lsr] Flex Algo merge work, IS-IS and OSPF FAD sub-TLVs
>>>>=20
>>>> Hi Chris,
>>>>=20
>>>> Somehow, I lost the mail below and was only able to retrieve it =
from
>>>> the archive. Pardon my top posting.
>>>>=20
>>>> While I believe that sharing code points for values, e.g., IGP
>>>> Algorithm Type, is a good idea, I don=E2=80=99t necessarily think =
it is a
>>>> good idea to merge the TLV type registries. It seems to me it would
>>>> be a poor trade-off to impact optimal protocol encoding including
>>>> implementation just so we can have a combined IANA registry. It is
>>>> extremely unlikely that OSPF and IS-IS implementations will ever =
share a
>> common TLV parsing library.
>>>>=20
>>>> Note that we did discuss this once before in the context of the =
OSPF
>>>> and IS- IS Tunnel Encapsulation drafts. I'd appreciate hearing what
>>>> other WG members feel with respect to this issue.
>>>>=20
>>>> Thanks,
>>>> Acee
>>>>=20
>>>>=20
>>>>=20
>>>>=20
>>>>=20
>>>>=20
>>>> Christian Hopps  Thu, 17 May 2018 21:07 UTC
>>>>=20
>>>> So in looking at the IANA requests inside the newly merged flex
>>>> algorithm draft I noticed that the document is creating 2 separate
>>>> Flex Algorithm Definition sub-tlvs Registries for IS-IS and OSPF =
with
>>>> the initial content described in sections:
>>>>=20
>>>> 6.1.  ISIS Flexible Algorithm Exclude Admin Group Sub-TLV 6.2.  =
ISIS
>>>> Flexible Algorithm Include-Any Admin Group Sub-TLV 6.3.  ISIS
>>>> Flexible Algorithm Include-All Admin Group Sub-TLV
>>>>=20
>>>> 7.1.  OSPF Flexible Algorithm Exclude Admin Group Sub-TLV 7.2.  =
OSPF
>>>> Flexible Algorithm Include-Any Admin Group Sub-TLV 7.3.  OSPF
>>>> Flexible Algorithm Include-All Admin Group Sub-TLV
>>>>=20
>>>> They are basically the same thing (indeed the later OSPF sections
>>>> refer back to the IS-IS sections), except for one detail AFAICT, =
the
>>>> size of the type and length fields.
>>>>=20
>>>> I think we may have some options here to make this a bit more =
elegant.
>>>>=20
>>>> 1. Share the same sub-TLV structure
>>>>  a. using the OSPF sub-tlv structure (16 bit type and 16 bit len)
>>>> for both protocols
>>>>  b. using the IS-IS sub-tlv structure (8 bit type and 8 bit len) =
for
>>>> both protocols
>>>>=20
>>>> 2. Use different structure with the same type field size of the
>>>>  a. more constrained IS-IS 8 bit size
>>>>  b. less constrained OSPF 16 bit size
>>>>=20
>>>> 3. Define and use some generic method to define shared TLVs like =
this
>>>> where the only actual difference is the size of the type and length =
fields.
>>>>=20
>>>>=20
>>>> 1, Creates a clean and simple standard, 1 TLV definition and 1
>>>> sub-TLV registry.
>>>>=20
>>>> 1a, has the property that the length value in IS-IS can't normally
>>>> exceed an 8 bit value; however, sub-TLV length values are already
>>>> constrained beyond the field size as sub-TLVs may appear anywhere =
in
>> the TLV.
>>>>=20
>>>> 1b, restricts both protocols to 256 types, and perhaps more
>>>> importantly restricts the sub-TLV length to 257 octets. This is
>>>> handled all the time in IS-IS using repeated TLVs, but not so much =
(ever?)
>> in OSPF.
>>>>=20
>>>>=20
>>>> 2. Allows us to at least create a single IANA registry for the
>>>> sub-tlv types so we aren't duplicating them and their definitions =
for each
>> protocol.
>>>>=20
>>>>=20
>>>> 3. Is interesting but probably requires some work outside of this
>> document.
>>>>=20
>>>>=20
>>>> This document is serving as our guinea pig for how to merge work so =
I
>>>> think it's worth spending some effort on these types of details.
>>>>=20
>>>> Thanks,
>>>> Chris.
>>>>=20
>>>> _______________________________________________
>>>> Lsr mailing list
>>>> Lsr@ietf.org
>>>> https://www.ietf.org/mailman/listinfo/lsr
>=20


From nobody Sun May 20 06:21:52 2018
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Date: Sun, 20 May 2018 15:21:46 +0200
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Chris,

On 20/05/18 01:47 , Christian Hopps wrote:
> How about an option 2c
>
>    2c: Leave the encodings the way they are, and use a common registry to define the type/value semantics.

having a combined registry that defines FAD Sub-TLVs types is fine with me.

thanks,
Peter


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From: "Les Ginsberg (ginsberg)" 
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Thread-Topic: [Lsr]  Flex Algo merge work, IS-IS and OSPF FAD sub-TLVs
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From: Christian Hopps 
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Date: Mon, 21 May 2018 08:44:15 -0400
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Cc: "Acee Lindem (acee)" , "lsr@ietf.org" 
To: "Les Ginsberg (ginsberg)" 
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Subject: Re: [Lsr] Flex Algo merge work, IS-IS and OSPF FAD sub-TLVs
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On May 20, 2018, at 12:33 PM, Les Ginsberg (ginsberg) =
 wrote:
>=20
> Chris-
>=20
> I am happy to see that the scope of this discussion is narrowing. I =
think the scope of what your proposing is much more appropriate for =
discussion - but we are in still not in agreement.

This has never changed for me, so I'm glad that we are understanding =
each other better. :)

>> I agree! IGP algorithm is a great example, and I'm glad you agree =
that it was a
>> good idea. The content of the "Sub-TLVs of the FAD TLV" are in the =
same way
>> shared by both protocols. The types and the values are defined =
exactly the
>> same for both protocols. The *only* difference is the encoding of the =
type
>> (and length) value, the semantics are the same.
>>=20
> [Les:] There is a qualitative difference between having a common =
registry to identify a protocol independent attribute and having a =
common registry to define a protocol scoped type value.
>=20
> I appreciate that in this case we are defining a new container (FAD) =
which will have sub-containers that are applicable to both protocols. =
And I agree that it seems very hard to imagine any future sub-container =
which would not be applicable to both protocols. And I also agree that =
assigning the same type value to each sub-TLV for both protocols (now =
and in the future) is practical - and perhaps even desirable.

Great. BTW, nice renaming to "container" here.

> Nevertheless, the "type" which identifies the sub-container is a =
protocol scoped attribute.  The fact that we could use a common number =
in this case does not mean it is conceptually correct to consider the =
value as protocol independent.
>=20
> Let's please keep the definitions in registries which have the correct =
scope - which in the case of TLV/sub-TLV types is per/protocol.

I fail to see any difference from the IGP algorithm case, which you =
agreed with.

  SR Algorithm container:
    - distributed as a TLV inside Router Information Opaque LSA
    - distributed as a sub-TLV inside Router Capability TLV

  IGP Algorithm: The container content which is defined using a common =
registry.

Thanks,
Chris.

>   Les


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On =
May 20, 2018, at 12:33 PM, Les Ginsberg (ginsberg) <ginsberg@cisco.com> =
wrote:

        Chris-

        I am happy to see that the scope of this discussion is =
narrowing. I think the scope of what your proposing is much more =
appropriate for discussion - but we are in still not in =
agreement.

        This =
has never changed for me, so I'm glad that we are understanding each =
other better. :)

        I =
agree! IGP algorithm is a great example, and I'm glad you agree that it =
was a
        good idea. The content of the "Sub-TLVs of the FAD =
TLV" are in the same way
        shared by both protocols. The =
types and the values are defined exactly the
        same for both =
protocols. The *only* difference is the encoding of the type
        (and length) value, the semantics are the same.

        [Les:] There is a qualitative difference between having a =
common registry to identify a protocol independent attribute and having =
a common registry to define a protocol scoped type value.

        I appreciate =
that in this case we are defining a new container (FAD) which will have =
sub-containers that are applicable to both protocols. And I agree that =
it seems very hard to imagine any future sub-container which would not =
be applicable to both protocols. And I also agree that assigning the =
same type value to each sub-TLV for both protocols (now and in the =
future) is practical - and perhaps even desirable.

        Great.=
 BTW, nice renaming to "container" here.

        Nevertheless, the "type" which identifies the sub-container =
is a protocol scoped attribute.  The fact that we could use a =
common number in this case does not mean it is conceptually correct to =
consider the value as protocol =
independent.

        Let's please keep the definitions in registries which have =
the correct scope - which in the case of TLV/sub-TLV types is =
per/protocol.

        I =
fail to see any difference from the IGP algorithm case, which you agreed =
with.

          SR Algorithm =
container: 
            - distributed as a TLV inside =
Router Information Opaque LSA
            - distributed as a =
sub-TLV inside Router Capability TLV

          IGP Algorithm: The container content which =
is defined using a common registry.

        Thanks,
        Chris.

          =
Les

        =

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From: "Acee Lindem (acee)" 
To: "Peter Psenak (ppsenak)" , Christian Hopps , "Les Ginsberg (ginsberg)" 
CC: "lsr@ietf.org" 
Thread-Topic: [Lsr] Flex Algo merge work, IS-IS and OSPF FAD sub-TLVs
Thread-Index: AQHT8D2CKoE9smu2IUCuPNoXojwY7qQ6S18A
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From: "Les Ginsberg (ginsberg)" 
To: Christian Hopps 
CC: "Acee Lindem (acee)" , "lsr@ietf.org" 
Thread-Topic: [Lsr]  Flex Algo merge work, IS-IS and OSPF FAD sub-TLVs
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Subject: Re: [Lsr] Flex Algo merge work, IS-IS and OSPF FAD sub-TLVs
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Chris -

From: Christian Hopps 
Sent: Monday, May 21, 2018 5:44 AM
To: Les Ginsberg (ginsberg) 
Cc: Acee Lindem (acee) ; lsr@ietf.org
Subject: Re: [Lsr] Flex Algo merge work, IS-IS and OSPF FAD sub-TLVs

On May 20, 2018, at 12:33 PM, Les Ginsberg (ginsberg) > wrote:

Chris-

I am happy to see that the scope of this discussion is narrowing. I think t=
he scope of what your proposing is much more appropriate for discussion - b=
ut we are in still not in agreement.

This has never changed for me, so I'm glad that we are understanding each o=
ther better. :)


I agree! IGP algorithm is a great example, and I'm glad you agree that it w=
as a
good idea. The content of the "Sub-TLVs of the FAD TLV" are in the same way
shared by both protocols. The types and the values are defined exactly the
same for both protocols. The *only* difference is the encoding of the type
(and length) value, the semantics are the same.
[Les:] There is a qualitative difference between having a common registry t=
o identify a protocol independent attribute and having a common registry to=
 define a protocol scoped type value.

I appreciate that in this case we are defining a new container (FAD) which =
will have sub-containers that are applicable to both protocols. And I agree=
 that it seems very hard to imagine any future sub-container which would no=
t be applicable to both protocols. And I also agree that assigning the same=
 type value to each sub-TLV for both protocols (now and in the future) is p=
ractical - and perhaps even desirable.

Great. BTW, nice renaming to "container" here.


Nevertheless, the "type" which identifies the sub-container is a protocol s=
coped attribute.  The fact that we could use a common number in this case d=
oes not mean it is conceptually correct to consider the value as protocol i=
ndependent.

Let's please keep the definitions in registries which have the correct scop=
e - which in the case of TLV/sub-TLV types is per/protocol.

I fail to see any difference from the IGP algorithm case, which you agreed =
with.


  SR Algorithm container:
    - distributed as a TLV inside Router Information Opaque LSA
    - distributed as a sub-TLV inside Router Capability TLV

  IGP Algorithm: The container content which is defined using a common regi=
stry.

[Les:] The SR Algorithm "container identifier" is NOT managed by the IGP Al=
gorithm Registry. It is only the algorithm identifiers- which are advertise=
d inside the protocol specific containers - which are managed by the shared=
 registry.

Here, however, you are proposing to manage the identifier for the container=
 (not its contents) in a shared registry. That I object to.

TLV/sub-TLV codepoints are a protocol property. That is why they are manage=
d in protocol specific registries.
You are now proposing to take "some" protocol specific identifiers and mana=
ge them in a protocol independent registry. This is wrong.

You think it makes sense to go to https://www.iana.org/assignments/isis-tlv=
-codepoints/isis-tlv-codepoints.xhtml to find all the IS-IS TLV/sub-TLV cod=
epoints EXCEPT for a few which you want to put into a shared IS-IS/OSPF reg=
istry?
I don't.

   Les

Thanks,
Chris.

  Les


--_000_1edb59cc76f64de4b8462200061cbba4XCHALN001ciscocom_
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        Chris -
        

         
        

        

        

        

        From: Christian Hopps <chopps@cho=
pps.org>

        
Sent: Monday, May 21, 2018 5:44 AM
        
To: Les Ginsberg (ginsberg) <ginsberg@cisco.com>
        
Cc: Acee Lindem (acee) <acee@cisco.com>; lsr@ietf.org
        
Subject: Re: [Lsr] Flex Algo merge work, IS-IS and OSPF FAD sub-TLVs=

        

        

        

         
        

        On May 20, 2018, at 12:33 PM, Les Ginsberg (ginsberg=
) <ginsberg@cisco.com> wrot=
e:
        

        

        

         
        

        

        Chris-
        

        
I am happy to see that the scope of this discussion is narrowing. I think t=
he scope of what your proposing is much more appropriate for discussion - b=
ut we are in still not in agreement.
        

        

        

        

         
        

        

        

        This has never changed for me, so I'm glad that we a=
re understanding each other better. :)
        

        


        

        

        

        

        

        

        I agree! IGP algori=
thm is a great example, and I'm glad you agree that it was a
        
good idea. The content of the "Sub-TLVs of the FAD TLV" are in th=
e same way
        
shared by both protocols. The types and the values are defined exactly the<=
br>
same for both protocols. The *only* difference is the encoding of the type<=
br>
(and length) value, the semantics are the same.
        

        

        [Les:] There is a qualitative difference between h=
aving a common registry to identify a protocol independent attribute and ha=
ving a common registry to define a protocol scoped
 type value.
        

        
I appreciate that in this case we are defining a new container (FAD) which =
will have sub-containers that are applicable to both protocols. And I agree=
 that it seems very hard to imagine any future sub-container which would no=
t be applicable to both protocols.
 And I also agree that assigning the same type value to each sub-TLV for bo=
th protocols (now and in the future) is practical - and perhaps even desira=
ble.
        

        

        

        

         
        

        

        

        Great. BTW, nice renaming to "container" h=
ere.
        

        


        

        

        

        

        

        Nevertheless, the "type" which identifie=
s the sub-container is a protocol scoped attribute.  The fact that we =
could use a common number in this case does not mean it is conceptually
 correct to consider the value as protocol independent.

        

        

        

        


        
Let's please keep the definitions in registries which have the correct scop=
e - which in the case of TLV/sub-TLV types is per/protocol.
        

        

        

        

         
        

        

        

        I fail to see any difference from the IGP algorithm =
case, which you agreed with.
        

         
        

        

        

         
        

        

        

          SR Algorithm container: 
        

        

        

            - distributed as a TLV inside Router I=
nformation Opaque LSA
        

        

        

            - distributed as a sub-TLV inside Rout=
er Capability TLV
        

        

        

        

         
        

        

        

          IGP Algorithm: The container content which is=
 defined using a common registry.
        

        

        

        

        

         
        

        [Les:] The SR Algorithm “=
container identifier” is NOT managed by the IGP Algorithm Registry. I=
t is only the algorithm identifiers– which are advertised
 inside the protocol specific containers – which are managed by the s=
hared registry.
        

         
        

        Here, however, you are proposin=
g to manage the identifier for the container (not its contents) in a shared=
 registry. That I object to.
        

         
        

        TLV/sub-TLV codepoints are a pr=
otocol property. That is why they are managed in protocol specific registri=
es.
        

        You are now proposing to take &=
#8220;some” protocol specific identifiers and manage them in a protoc=
ol independent registry. This is wrong.
        

         
        

        You think it makes sense to go =
to

https://www.iana.org/assignments/isis-tlv-codepoints/isis-tlv-codepoints.xh=
tml to find all the IS-IS TLV/sub-TLV codepoints EXCEPT for a few which=
 you want to put into a shared IS-IS/OSPF registry?
        

        I don’t.
        

         
        

           Les
        

         
        

        

        

        Thanks,
        

        

        

        

        Chris.
        

        

        

         
        

        

        

        

          Les
        

        

        

        

         
        

        

        



--_000_1edb59cc76f64de4b8462200061cbba4XCHALN001ciscocom_--


From nobody Mon May 21 08:54:06 2018
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Date: Mon, 21 May 2018 11:53:59 -0400
In-Reply-To: <73789432-BD35-4E42-96BB-7D48D4E10E93@cisco.com>
Cc: "Peter Psenak (ppsenak)" , "Les Ginsberg (ginsberg)" , "lsr@ietf.org" 
To: "Acee Lindem (acee)" 
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Subject: Re: [Lsr] Flex Algo merge work, IS-IS and OSPF FAD sub-TLVs
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We aren't talking generically about TLV space here. When I raised the =
question I certainly intended it to be limited to times, as is the case =
here, where we are literally duplicating registries b/c they both refer =
to the same thing. I didn't realize that we'd already done this with SR =
IGP Algorithm registry.

I did also include talking about what (if anything) to do with the =
duplicated containing TLV, but it seems no one wants to go there, which =
is fine, and I happen to agree probably is going too far.

Thanks,
Chris.

> On May 21, 2018, at 11:11 AM, Acee Lindem (acee)  =
wrote:
>=20
> Hi Peter, Chris,
>=20
> In this particular case, it may be ok as long as we just limit the =
code point space to the 1 octet type (i.e., 0-255 with reserved values). =
However, for all the reasons Peter and Les have already articulated, =
there will be cases where the TLV or Sub-TLV registries cannot be =
common. So, I have to ask myself just what are we gaining by here? The =
encodings are not going to be identical (for all the previously =
mentioned reasons) and this leaves the door open for time wasted on =
revisiting this issue...
>=20
> Thanks,
> Acee
>=20
> =EF=BB=BFOn 5/20/18, 9:21 AM, "Peter Psenak (ppsenak)" =
 wrote:
>=20
>    Chris,
>=20
>    On 20/05/18 01:47 , Christian Hopps wrote:
>> How about an option 2c
>>=20
>>   2c: Leave the encodings the way they are, and use a common registry =
to define the type/value semantics.
>=20
>    having a combined registry that defines FAD Sub-TLVs types is fine =
with me.
>=20
>    thanks,
>    Peter
>=20
>=20
>=20


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From: Christian Hopps 
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Date: Mon, 21 May 2018 12:14:47 -0400
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Cc: "Acee Lindem (acee)" , "lsr@ietf.org" 
To: "Les Ginsberg (ginsberg)" 
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Subject: Re: [Lsr] Flex Algo merge work, IS-IS and OSPF FAD sub-TLVs
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> On May 21, 2018, at 11:46 AM, Les Ginsberg (ginsberg) =
 wrote:
>=20
> I fail to see any difference from the IGP algorithm case, which you =
agreed with.
>=20
>=20
>   SR Algorithm container:
>     - distributed as a TLV inside Router Information Opaque LSA
>     - distributed as a sub-TLV inside Router Capability TLV
>=20
>   IGP Algorithm: The container content which is defined using a common =
registry.
>=20
> [Les:] The SR Algorithm =E2=80=9Ccontainer identifier=E2=80=9D is NOT =
managed by the IGP Algorithm Registry. It is only the algorithm =
identifiers=E2=80=93 which are advertised inside the protocol specific =
containers =E2=80=93 which are managed by the shared registry.
>=20
> Here, however, you are proposing to manage the identifier for the =
container (not its contents) in a shared registry. That I object to.

Unfortunately, you are incorrect here, I never made that proposal. I =
presented various options we might choose to share commonality, none of =
them had to do with sharing top-level code-points, all of them had to do =
strictly with the content of the FAD [sub-]TLV which is being entirely =
defined by the document in question.

>  TLV/sub-TLV codepoints are a protocol property. That is why they are =
managed in protocol specific registries.
> You are now proposing to take =E2=80=9Csome=E2=80=9D protocol specific =
identifiers and manage them in a protocol independent registry. This is =
wrong.

I'm talking about the content of the FAD [sub-]TLV only, just like IGP =
Algorithm registry is defining the content for the SR Algorithm =
[sub-]TLV, they are completely analogous.

>=20
> You think it makes sense to go to =
https://www.iana.org/assignments/isis-tlv-codepoints/isis-tlv-codepoints.x=
html =
 to find all the IS-IS TLV/sub-TLV codepoints EXCEPT for a few =
which you want to put into a shared IS-IS/OSPF registry?

This is silly, perhaps not intended but it's very close to a straw man. =
I know I wrote in an early mail explicitly that my intent had nothing to =
do with back over anything, so no.

Thanks,
Chris.

> I don=E2=80=99t.
>=20
>    Les
>=20
> Thanks,
> Chris.
>=20
>   Les
>=20


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        On =
May 21, 2018, at 11:46 AM, Les Ginsberg (ginsberg) <ginsberg@cisco.com> =
wrote:

        I fail to see any difference from the =
IGP algorithm case, which you agreed with.
         
         
          SR Algorithm container: 
            - distributed as a TLV inside Router =
Information Opaque LSA
          =
  - distributed as a sub-TLV inside Router Capability TLV
         
          IGP Algorithm: The container =
content which is defined using a common registry.
         
        [Les:] The SR Algorithm =E2=80=9Ccontainer identifier=E2=80=9D =
is NOT managed by the IGP Algorithm Registry. It is only the algorithm =
identifiers=E2=80=93 which are advertised inside the protocol specific =
containers =E2=80=93 which are managed by the shared registry.
         
        Here, however, you are =
proposing to manage the identifier for the container (not its contents) =
in a shared registry. That I object =
to.
        <=
div>
        Unfortunately, you are incorrect here, I =
never made that proposal. I presented various options we might choose to =
share commonality, none of them had to do with sharing top-level =
code-points, all of them had to do strictly with the content of the FAD =
[sub-]TLV which is being entirely defined by the document in =
question.

         TLV/sub-TLV =
codepoints are a protocol property. That is why they are managed in =
protocol specific registries.
        You are now proposing to take =E2=80=9Csome=E2=
=80=9D protocol specific identifiers and manage them in a protocol =
independent registry. This is =
wrong.

        I'm talking about the content of the FAD =
[sub-]TLV only, just like IGP Algorithm registry is defining the content =
for the SR Algorithm [sub-]TLV, they are completely =
analogous.

         
        You think it makes sense to go to https://www.iana.org/assignments/isis-tlv-codepoints/isis-tlv-c=
odepoints.xhtml to =
find all the IS-IS TLV/sub-TLV codepoints EXCEPT for a few which you =
want to put into a shared IS-IS/OSPF =
registry?
        <=
div>
        This is silly, perhaps not intended but =
it's very close to a straw man. I know I wrote in an early mail =
explicitly that my intent had nothing to do with back over anything, so =
no.

        Thanks,
        Chris.

        I don=E2=80=99t.
         
           Les
         
        Thanks,
        Chris.
         
          Les
         

        =

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From: "Acee Lindem (acee)" 
To: "lsr@ietf.org" 
Thread-Topic: [Lsr] LSR WG Last Call for "Signaling MSD (Maximum SID Depth) using OSPF" - draft-ietf-ospf-segment-routing-msd-10.txt
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From: "Les Ginsberg (ginsberg)" 
To: Christian Hopps 
CC: "Acee Lindem (acee)" , "lsr@ietf.org" 
Thread-Topic: [Lsr]  Flex Algo merge work, IS-IS and OSPF FAD sub-TLVs
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Date: Mon, 21 May 2018 16:46:53 +0000
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Subject: Re: [Lsr] Flex Algo merge work, IS-IS and OSPF FAD sub-TLVs
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Ok, so your position is that b/c the defined content takes the form of =
type-len-value the registry for it cannot be shared, but if, like IGP =
Algorithm, it had "just" been a collection of values sharing would be =
fine.

Peter was OK with sharing the registry. I am as well.

Let's let others chime in.

Thanks,
Chris.

> On May 21, 2018, at 12:46 PM, Les Ginsberg (ginsberg) =
 wrote:
>=20
> Chris =E2=80=93
>=20
> I think you are making this thread far more confusing than necessary.
> Protocol code points include:
>=20
> Top level TLV types
> Sub-TLV types
> Sub-sub-TLV types
> Etc.
>=20
> Obviously a sub-TLV is =E2=80=9Ccontained=E2=80=9D in a TLV
> And a =E2=80=9Csub-sub-TLV=E2=80=9D is contained within a sub-TLV
>=20
> This does not alter the fact that all of these type identifiers are =
protocol specific and are managed in protocol specific registries. There =
are many existing examples of this.
>=20
> The values managed in the =E2=80=9CIGP Algorithm=E2=80=9D registry are =
not used as a =E2=80=9Ctype=E2=80=9D identifier at any level in the =
protocol. They are the values advertised within the =E2=80=9Ccontainer=E2=80=
=9D =E2=80=93 whether that container is a TLV or a sub-TLV or=E2=80=A6
>=20
> If we cannot agree on this then we will never agree on anything.
>=20
> =E2=80=9Ctypes=E2=80=9D at any level are protocol specific and should =
be managed on protocol specific registries.
>=20
>    Les
>=20
>=20
>=20
> From: Christian Hopps 
> Sent: Monday, May 21, 2018 9:15 AM
> To: Les Ginsberg (ginsberg) 
> Cc: Acee Lindem (acee) ; lsr@ietf.org
> Subject: Re: [Lsr] Flex Algo merge work, IS-IS and OSPF FAD sub-TLVs
>=20
>=20
> On May 21, 2018, at 11:46 AM, Les Ginsberg (ginsberg) =
> wrote:
>=20
> I fail to see any difference from the IGP algorithm case, which you =
agreed with.
>=20
>=20
>   SR Algorithm container:
>     - distributed as a TLV inside Router Information Opaque LSA
>     - distributed as a sub-TLV inside Router Capability TLV
>=20
>   IGP Algorithm: The container content which is defined using a common =
registry.
>=20
> [Les:] The SR Algorithm =E2=80=9Ccontainer identifier=E2=80=9D is NOT =
managed by the IGP Algorithm Registry. It is only the algorithm =
identifiers=E2=80=93 which are advertised inside the protocol specific =
containers =E2=80=93 which are managed by the shared registry.
>=20
> Here, however, you are proposing to manage the identifier for the =
container (not its contents) in a shared registry. That I object to.
>=20
> Unfortunately, you are incorrect here, I never made that proposal. I =
presented various options we might choose to share commonality, none of =
them had to do with sharing top-level code-points, all of them had to do =
strictly with the content of the FAD [sub-]TLV which is being entirely =
defined by the document in question.
>=20
>  TLV/sub-TLV codepoints are a protocol property. That is why they are =
managed in protocol specific registries.
> You are now proposing to take =E2=80=9Csome=E2=80=9D protocol specific =
identifiers and manage them in a protocol independent registry. This is =
wrong.
>=20
> I'm talking about the content of the FAD [sub-]TLV only, just like IGP =
Algorithm registry is defining the content for the SR Algorithm =
[sub-]TLV, they are completely analogous.
>=20
>=20
>=20
> You think it makes sense to go to =
https://www.iana.org/assignments/isis-tlv-codepoints/isis-tlv-codepoints.x=
html =
 to find all the IS-IS TLV/sub-TLV codepoints EXCEPT for a few =
which you want to put into a shared IS-IS/OSPF registry?
>=20
> This is silly, perhaps not intended but it's very close to a straw =
man. I know I wrote in an early mail explicitly that my intent had =
nothing to do with back over anything, so no.
>=20
> Thanks,
> Chris.
>=20
>=20
> I don=E2=80=99t.
>=20
>    Les
>=20
> Thanks,
> Chris.
>=20
>   Les


--Apple-Mail=_53E9E724-CD28-4C69-BC77-5257DD61A371
Content-Transfer-Encoding: quoted-printable
Content-Type: text/html;
	charset=utf-8

Ok, =
so your position is that b/c the defined content takes the form of =
type-len-value the registry for it cannot be shared, but if, like IGP =
Algorithm, it had "just" been a collection of values sharing would be =
fine.

        Peter was OK =
with sharing the registry. I am as well.

        Let's let others chime in.

        Thanks,
        Chris.

        On May =
21, 2018, at 12:46 PM, Les Ginsberg (ginsberg) <ginsberg@cisco.com> =
wrote:

        Chris =E2=80=93
         
        I think you are making =
this thread far more confusing than necessary.
        Protocol code points =
include:
         
        Top level TLV types
        Sub-TLV types
        Sub-sub-TLV types
        Etc.
         
        Obviously a sub-TLV is =
=E2=80=9Ccontained=E2=80=9D in a TLV
        And a =E2=80=9Csub-sub-TL=
V=E2=80=9D is contained within a sub-TLV
         
        This does not alter the =
fact that all of these type identifiers are protocol specific and are =
managed in protocol specific registries. There are many existing =
examples of this.
         
        The=
 values managed in the =E2=80=9CIGP Algorithm=E2=80=9D registry are not =
used as a =E2=80=9Ctype=E2=80=9D identifier at any level in the =
protocol. They are the values advertised within the =E2=80=9Ccontainer=E2=80=
=9D =E2=80=93 whether that container is a TLV or a sub-TLV or=E2=80=A6
         
        If we cannot agree on =
this then we will never agree on anything.
         
        =E2=80=9Ctypes=E2=80=9D =
at any level are protocol specific and should be managed on protocol =
specific registries.
         
           Les
         
         
         
        From: Christian Hopps <chopps@chopps.org> 
        Sent: Monday, May 21, 2018 9:15 =
AM
        To: Les Ginsberg (ginsberg) =
<ginsberg@cisco.com>
        Cc: Acee =
Lindem (acee) <acee@cisco.com>; lsr@ietf.org
        Subject: Re: [Lsr] Flex Algo merge =
work, IS-IS and OSPF FAD sub-TLVs
         
         
        On May 21, 2018, at 11:46 AM, Les Ginsberg (ginsberg) <ginsberg@cisco.com> =
wrote:
         
        I fail to =
see any difference from the IGP algorithm case, which you agreed =
with.
         
         
          SR Algorithm container: 
            - =
distributed as a TLV inside Router Information Opaque LSA
            - =
distributed as a sub-TLV inside Router Capability TLV
         
          IGP Algorithm: =
The container content which is defined using a common registry.
         
        [Les:] The SR =
Algorithm =E2=80=9Ccontainer identifier=E2=80=9D is NOT managed by the =
IGP Algorithm Registry. It is only the algorithm identifiers=E2=80=93 =
which are advertised inside the protocol specific containers =E2=80=93 =
which are managed by the shared registry.
         
        Here, however, =
you are proposing to manage the identifier for the container (not its =
contents) in a shared registry. That I object to.
         
        Unfortunately, you are incorrect here, I =
never made that proposal. I presented various options we might choose to =
share commonality, none of them had to do with sharing top-level =
code-points, all of them had to do strictly with the content of the FAD =
[sub-]TLV which is being entirely defined by the document in =
question.
         
         TLV/sub-TLV codepoints are a protocol property. That is =
why they are managed in protocol specific registries.
        You are now proposing to take =E2=80=9Csome=E2=80=9D protocol =
specific identifiers and manage them in a protocol independent registry. =
This is wrong.
         
        I'm talking about the content of the FAD =
[sub-]TLV only, just like IGP Algorithm registry is defining the content =
for the SR Algorithm [sub-]TLV, they are completely analogous.


         
        You think it =
makes sense to go to https://www.iana.org/assignments/isis-tlv-codepoints/isis-tlv-c=
odepoints.xhtml to find all the IS-IS =
TLV/sub-TLV codepoints EXCEPT for a few which you want to put into a =
shared IS-IS/OSPF registry?
         
        This is silly, perhaps not intended but =
it's very close to a straw man. I know I wrote in an early mail =
explicitly that my intent had nothing to do with back over anything, so =
no.
         
        Thanks,
        Chris.


        I =
don=E2=80=99t.
         
           =
Les
         
        Thanks,
        Chris.
         
          =
Les

        =

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From: "Les Ginsberg (ginsberg)" 
To: Christian Hopps 
CC: "Acee Lindem (acee)" , "lsr@ietf.org" 
Thread-Topic: [Lsr]  Flex Algo merge work, IS-IS and OSPF FAD sub-TLVs
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Date: Mon, 21 May 2018 17:19:33 +0000
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From: "Acee Lindem (acee)" 
To: Christian Hopps 
CC: "Peter Psenak (ppsenak)" , "Les Ginsberg (ginsberg)" , "lsr@ietf.org" 
Thread-Topic: [Lsr] Flex Algo merge work, IS-IS and OSPF FAD sub-TLVs
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Subject: Re: [Lsr] Flex Algo merge work, IS-IS and OSPF FAD sub-TLVs
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From: "Acee Lindem (acee)" 
To: "draft-ietf-ospf-ospfv3-segment-routing-extensions@ietf.org" 
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Thread-Topic: IPR Poll for "OSPFv3 Extensions for Segment Routing" Prior to WG Last Call
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Subject: [Lsr] IPR Poll for "OSPFv3 Extensions for Segment Routing" Prior to WG Last Call
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From: Rob Shakir 
Date: Tue, 22 May 2018 07:48:22 -0700
Message-ID: 
To: "Acee Lindem (acee)" 
Cc: "draft-ietf-ospf-ospfv3-segment-routing-extensions@ietf.org" ,  "lsr@ietf.org" 
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Subject: Re: [Lsr] IPR Poll for "OSPFv3 Extensions for Segment Routing" Prior to WG Last Call
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Hi Acee.

I am not Aware of any IPR on this draft other than that which has already
been disclosed by Cisco.

Thanks,
r.

On Tue, May 22, 2018, 7:43 AM Acee Lindem (acee)  wrote:

> Are you aware of any IPR that applies to
>
> draft-ietf-ospf-ospfv3-segment-routing-extensions-12.txt?
>
>
>
> If so, has this IPR been disclosed in compliance with IETF IPR rules
>
> (see RFCs 3979, 4879, 3669 and 5378 for more details).
>
>
>
> If you are listed as a document author or contributor please respond
>
> to this email regardless of whether or not you are aware of any
>
> relevant IPR. *The response needs to be sent to the LSR WG mailing
>
> list.* The document will not advance to the next stage until a
>
> response has been received from each author and contributor.
>
>
>
> If you are on the LSR WG email list but are not listed as an author or
>
> contributor, then please explicitly respond only if you are aware of
>
> any IPR that has not yet been disclosed in conformance with IETF rules.
>
>
>
> Thanks,
> Acee
>

--0000000000004573d7056ccc8329
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Hi Acee.=C2=A0

        I am not Aware of any IPR on=
 this draft other than that which has already been disclosed by Cisco.=C2=
=A0

        Thanks,
        r.=C2=A0

        On Tue, May 22, 2018, 7:43 AM Acee Lindem=
 (acee) <acee@cisco.com> wrote:=

        






        

        

        Are you aware of an=
y IPR that applies to

        

        draft-ietf-ospf-osp=
fv3-segment-routing-extensions-12.txt?

        

        =C2=A0
        

        If so, has this IPR=
 been disclosed in compliance with IETF IPR rules

        

        (see RFCs 3979, 487=
9, 3669 and 5378 for more details).
        

        =C2=A0
        

        If you are listed a=
s a document author or contributor please respond
        

        to this email regar=
dless of whether or not you are aware of any
        

        relevant IPR. *The =
response needs to be sent to the LSR WG mailing
        

        list.* The document=
 will not advance to the next stage until a
        

        response has been r=
eceived from each author and contributor.
        

        =C2=A0
        

        If you are on the L=
SR WG email list but are not listed as an author or

        contributor, then p=
lease explicitly respond only if you are aware of
        

        any IPR that has no=
t yet been disclosed in conformance with IETF rules.

        =C2=A0
        

        Thanks,
        
Acee 
        

        

        


        

--0000000000004573d7056ccc8329--


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Hi Acee,

I am not aware of any IPR on this draft other than ones that have been 
disclosed already.

thanks,
Peter



On 22/05/18 16:43 , Acee Lindem (acee) wrote:
> Are you aware of any IPR that applies to
>
> draft-ietf-ospf-ospfv3-segment-routing-extensions-12.txt?
>
> If so, has this IPR been disclosed in compliance with IETF IPR rules
>
> (see RFCs 3979, 4879, 3669 and 5378 for more details).
>
> If you are listed as a document author or contributor please respond
>
> to this email regardless of whether or not you are aware of any
>
> relevant IPR. *The response needs to be sent to the LSR WG mailing
>
> list.* The document will not advance to the next stage until a
>
> response has been received from each author and contributor.
>
> If you are on the LSR WG email list but are not listed as an author or
>
> contributor, then please explicitly respond only if you are aware of
>
> any IPR that has not yet been disclosed in conformance with IETF rules.
>
> Thanks,
> Acee
>


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not aware of any undisclosed IPR

> On 22.05.2018, at 16:43, Acee Lindem (acee)  wrote:
> 
> Are you aware of any IPR that applies to
> draft-ietf-ospf-ospfv3-segment-routing-extensions-12.txt?
>  
> If so, has this IPR been disclosed in compliance with IETF IPR rules
> (see RFCs 3979, 4879, 3669 and 5378 for more details).
>  
> If you are listed as a document author or contributor please respond
> to this email regardless of whether or not you are aware of any
> relevant IPR. *The response needs to be sent to the LSR WG mailing
> list.* The document will not advance to the next stage until a
> response has been received from each author and contributor.
>  
> If you are on the LSR WG email list but are not listed as an author or
> contributor, then please explicitly respond only if you are aware of
> any IPR that has not yet been disclosed in conformance with IETF rules.
>  
> Thanks,
> Acee

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        not aware of any undisclosed IPR

        On 22.05.2018, at 16:43, Acee Lindem (acee) <acee@cisco.com> wrote:

        







        

        Are you aware of any IPR that applies to

        

        draft-ietf-ospf-ospfv3-segment-routing-extensions-12.txt?

        

         
        

        If so, has this IPR been disclosed in compliance with IETF IPR rules

        

        (see RFCs 3979, 4879, 3669 and 5378 for more details).
        

         
        

        If you are listed as a document author or contributor please respond
        

        to this email regardless of whether or not you are aware of any
        

        relevant IPR. *The response needs to be sent to the LSR WG mailing
        

        list.* The document will not advance to the next stage until a
        

        response has been received from each author and contributor.
        

         
        

        If you are on the LSR WG email list but are not listed as an author or
        

        contributor, then please explicitly respond only if you are aware of
        

        any IPR that has not yet been disclosed in conformance with IETF rules.
        

         
        

        Thanks,
        
Acee 
        

        



        
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From: Jeff Tantsura 
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In-Reply-To: <49955639-7858-4B37-9BA1-7F4621FB68A4@cisco.com>
Date: Tue, 22 May 2018 23:05:53 +0200
Cc: "draft-ietf-ospf-ospfv3-segment-routing-extensions@ietf.org" ,  "lsr@ietf.org" 
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References: <49955639-7858-4B37-9BA1-7F4621FB68A4@cisco.com>
To: "Acee Lindem (acee)" 
Archived-At: 
Subject: Re: [Lsr] IPR Poll for "OSPFv3 Extensions for Segment Routing" Prior to WG Last Call
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Acee,

I=E2=80=99m no aware of any IPR that applies to this draft.

Regards,
Jeff

> On May 22, 2018, at 16:43, Acee Lindem (acee)  wrote:
>=20
> Are you aware of any IPR that applies to
> draft-ietf-ospf-ospfv3-segment-routing-extensions-12.txt?
> =20
> If so, has this IPR been disclosed in compliance with IETF IPR rules
> (see RFCs 3979, 4879, 3669 and 5378 for more details).
> =20
> If you are listed as a document author or contributor please respond
> to this email regardless of whether or not you are aware of any
> relevant IPR. *The response needs to be sent to the LSR WG mailing
> list.* The document will not advance to the next stage until a
> response has been received from each author and contributor.
> =20
> If you are on the LSR WG email list but are not listed as an author or
> contributor, then please explicitly respond only if you are aware of
> any IPR that has not yet been disclosed in conformance with IETF rules.
> =20
> Thanks,
> Acee

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Acee,

        I=E2=80=99m no awa=
re of any IPR that applies to this draft.

        Regards,
        Jeff

        On May 22, 2018, at 16:43, Acee Li=
ndem (acee) <acee@cisco.com> wro=
te:

        







        

        Are you aware of any=
 IPR that applies to

        

        draft-ietf-ospf-ospf=
v3-segment-routing-extensions-12.txt?

        

         
        

        If so, has this IPR b=
een disclosed in compliance with IETF IPR rules

        

        (see RFCs 3979, 4879=
, 3669 and 5378 for more details).
        

         
        

        If you are listed as=
 a document author or contributor please respond
        

        to this email regard=
less of whether or not you are aware of any
        

        relevant IPR. *The r=
esponse needs to be sent to the LSR WG mailing
        

        list.* The document w=
ill not advance to the next stage until a
        

        response has been re=
ceived from each author and contributor.
        

         
        

        If you are on the LS=
R WG email list but are not listed as an author or
        

        contributor, then pl=
ease explicitly respond only if you are aware of
        

        any IPR that has not=
 yet been disclosed in conformance with IETF rules.
        

         
        

        Thanks,
        
Acee 
        

        



        =

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From: "Henderickx, Wim (Nokia - BE/Antwerp)" 
To: Jeff Tantsura , "Acee Lindem (acee)" 
CC: "draft-ietf-ospf-ospfv3-segment-routing-extensions@ietf.org" , "lsr@ietf.org" 
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Subject: [Lsr] I-D Action: draft-ietf-ospf-ospfv3-segment-routing-extensions-13.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Link State Routing WG of the IETF.

        Title           : OSPFv3 Extensions for Segment Routing
        Authors         : Peter Psenak
                          Clarence Filsfils
                          Stefano Previdi
                          Hannes Gredler
                          Rob Shakir
                          Wim Henderickx
                          Jeff Tantsura
	Filename        : draft-ietf-ospf-ospfv3-segment-routing-extensions-13.txt
	Pages           : 28
	Date            : 2018-05-23

Abstract:
   Segment Routing (SR) allows a flexible definition of end-to-end paths
   within IGP topologies by encoding paths as sequences of topological
   sub-paths, called "segments".  These segments are advertised by the
   link-state routing protocols (IS-IS and OSPF).

   This draft describes the OSPFv3 extensions required for Segment
   Routing.



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-ospf-ospfv3-segment-routing-extensions/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-ospf-ospfv3-segment-routing-extensions-13
https://datatracker.ietf.org/doc/html/draft-ietf-ospf-ospfv3-segment-routing-extensions-13

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-ospf-ospfv3-segment-routing-extensions-13


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/


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Subject: Re: [Lsr] IPR Poll for "OSPFv3 Extensions for Segment Routing" Prior to WG Last Call
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Hi,

I'm not aware of any undisclosed IPR.

Thanks.
s.



----- Original Message --------
Subject:        IPR Poll for "OSPFv3 Extensions for Segment Routing" Prior
to
WG Last Call
Resent-Date:    Tue, 22 May 2018 07:43:53 -0700
Resent-From:    
Resent-To:      , ,
, , ,
, 
Date:   Tue, 22 May 2018 14:43:46 +0000
From:   Acee Lindem (acee) 
To:     draft-ietf-ospf-ospfv3-segment-routing-extensions@ietf.org

CC:     lsr@ietf.org 



Are you aware of any IPR that applies to

draft-ietf-ospf-ospfv3-segment-routing-extensions-12.txt?

If so, has this IPR been disclosed in compliance with IETF IPR rules

(see RFCs 3979, 4879, 3669 and 5378 for more details).

If you are listed as a document author or contributor please respond

to this email regardless of whether or not you are aware of any

relevant IPR. *The response needs to be sent to the LSR WG mailing

list.* The document will not advance to the next stage until a

response has been received from each author and contributor.

If you are on the LSR WG email list but are not listed as an author or

contributor, then please explicitly respond only if you are aware of

any IPR that has not yet been disclosed in conformance with IETF rules.

Thanks,
Acee

--000000000000a3a22b056ce0c5cc
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        Hi,

        I'm not aware of any un=
disclosed IPR.=C2=A0

        Thanks.=C2=A0
        <=
div dir=3D"auto">s.=




        ----- Original Message --------
        Subject:=C2=A0 =C2=A0 =C2=A0 =C2=A0=
 IPR Poll for "OSPFv3 Extensions for Segment Routing" Prior to
        WG Last Call
        Resent-Date:=C2=A0 =C2=A0 Tue, 22 May 2018 07:43:53 -0700=

        Resent-From:=C2=A0 =C2=A0 <alias-=
bounces@ietf.org>
        Resent-To:=C2=A0 =C2=A0 =C2=
=A0 <=
ppsenak@cisco.com>, <cfilsfil@cisco.com>,
        <=
span style=3D"font-family:sans-serif;font-size:12.8px"><        sprevidi@cisco.com>, <<=
a href=3D"mailto:hannes@rtbrick.com" style=3D"text-decoration-line:none;col=
or:rgb(66,133,244);font-family:sans-serif;font-size:12.8px">hannes@rtbrick.=
com>, <robjs@googl=
e.com>,
        <wim.henderickx@nokia.com>, <jefftant.ietf@gm=
ail.com>
        Date:=C2=A0 =C2=A0Tue, 22 May 2018 14=
:43:46 +0000
        From:=C2=A0 =C2=A0Ace=
e Lindem (acee) <acee@cisco.com>
        To:=C2=A0 =C2=A0 =C2=
=A0draft-ietf-ospf-ospfv3-segment-routing-=
extensions@ietf.org
        <draft-ietf-ospf-ospfv3-segment-routing-extensions@ietf.=
org><=
br style=3D"font-family:sans-serif;font-size:12.8px">CC:=C2=A0 =C2=A0 =C2=A0lsr@ietf.org=C2=A0<lsr@ietf.org>



        Are you aware of any IPR that applies to

        draft-ietf-ospf-ospfv3-segment-routing-extensions-12.txt?

        If s=
o, has this IPR been disclosed in compliance with IETF IPR rules

        (see RFCs 3979, 4879, 3669 and 5378 for more details).

        If you are listed as a document author or contributor please resp=
ond

        to this email regardless of whether or not you ar=
e aware of any
        =

        relevant IPR. *The response needs to be =
sent to the LSR WG mailing

        list.* The document will not=
 advance to the next stage until a

        <=
span style=3D"font-family:sans-serif;font-size:12.8px">response has been re=
ceived from each author and contributor.

        If you are on =
the LSR WG email list but are not listed as an author or

        contributor, then please explicitly respond only if you are aware of

        any IPR that has not yet been disclosed in conformance with=
 IETF rules.
        Thanks,
        Acee
        

--000000000000a3a22b056ce0c5cc--


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From: "Acee Lindem (acee)" 
To: "lsr@ietf.org" 
Thread-Topic: LSR Working Group Last Call for "OSPFv3 Extensions for Segment Routing" - draft-ietf-ospf-ospfv3-segment-routing-extensions-13
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To: draft-ietf-ospf-ospfv3-segment-routing-extensions@ietf.org, "lsr@ietf.org" , "Peter Psenak (ppsenak)" 
From: "Clarence Filsfils (cfilsfil)" 
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Subject: [Lsr] Fwd: IPR Poll for "OSPFv3 Extensions for Segment Routing" Prior to WG Last Call
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I'm not aware of any undisclosed IPR.

Cheers,
Clarence


Subject: 	IPR Poll for "OSPFv3 Extensions for Segment Routing" Prior to
WG Last Call
Resent-Date: 	Tue, 22 May 2018 07:43:53 -0700
Resent-From: 	
Resent-To: 	, ,
, , ,
, 
Date: 	Tue, 22 May 2018 14:43:46 +0000
From: 	Acee Lindem (acee) 
To: 	draft-ietf-ospf-ospfv3-segment-routing-extensions@ietf.org

CC: 	lsr@ietf.org 



Are you aware of any IPR that applies to

draft-ietf-ospf-ospfv3-segment-routing-extensions-12.txt?

If so, has this IPR been disclosed in compliance with IETF IPR rules

(see RFCs 3979, 4879, 3669 and 5378 for more details).

If you are listed as a document author or contributor please respond

to this email regardless of whether or not you are aware of any

relevant IPR. *The response needs to be sent to the LSR WG mailing

list.* The document will not advance to the next stage until a

response has been received from each author and contributor.

If you are on the LSR WG email list but are not listed as an author or

contributor, then please explicitly respond only if you are aware of

any IPR that has not yet been disclosed in conformance with IETF rules.

Thanks,
Acee



.


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From: Christian Hopps 
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Date: Wed, 23 May 2018 11:28:34 -0400
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Subject: [Lsr] WG Last Call for draft-ietf-lsr-isis-rfc7810bis-00
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Hi Folks,

We're starting a 2 week WG Last Call on

    https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-rfc7810bis/

Please raise any objections or comments before Jun 6th, 2018.

Thanks,
Chris.


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From: "Acee Lindem (acee)" 
To: Christian Hopps , "lsr@ietf.org" 
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Thread-Topic: WG Last Call for draft-ietf-lsr-isis-rfc7810bis-00
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From: "Ketan Talaulikar (ketant)" 
To: Christian Hopps , "lsr@ietf.org" 
CC: "lsr-chairs@ietf.org" , "lsr-ads@ietf.org" 
Thread-Topic: [Lsr] WG Last Call for draft-ietf-lsr-isis-rfc7810bis-00
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Support publication for this update as it fixes an erroneous encoding descr=
iption in RFC7810.

Thanks,
Ketan

-----Original Message-----
From: Lsr  On Behalf Of Christian Hopps
Sent: 23 May 2018 20:59
To: lsr@ietf.org
Cc: lsr-chairs@ietf.org; lsr-ads@ietf.org; chopps@chopps.org
Subject: [Lsr] WG Last Call for draft-ietf-lsr-isis-rfc7810bis-00

Hi Folks,

We're starting a 2 week WG Last Call on

    https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-rfc7810bis/

Please raise any objections or comments before Jun 6th, 2018.

Thanks,
Chris.

_______________________________________________
Lsr mailing list
Lsr@ietf.org
https://www.ietf.org/mailman/listinfo/lsr


From nobody Wed May 23 09:22:00 2018
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Date: Wed, 23 May 2018 18:21:53 +0200
From: Peter Psenak 
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Subject: Re: [Lsr] WG Last Call for draft-ietf-lsr-isis-rfc7810bis-00
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I support publication.

Peter

On 23/05/18 17:28 , Christian Hopps wrote:
> Hi Folks,
>
> We're starting a 2 week WG Last Call on
>
>     https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-rfc7810bis/
>
> Please raise any objections or comments before Jun 6th, 2018.
>
> Thanks,
> Chris.
>
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr
> .
>


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From: "Acee Lindem (acee)" 
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Thread-Topic: [Lsr] LSR Working Group Last Call for "OSPFv3 Extensions for Segment Routing" - draft-ietf-ospf-ospfv3-segment-routing-extensions-13
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From: "Les Ginsberg (ginsberg)" 
To: "Acee Lindem (acee)" , "lsr@ietf.org" 
Thread-Topic: [Lsr] LSR Working Group Last Call for "OSPFv3 Extensions for Segment Routing" - draft-ietf-ospf-ospfv3-segment-routing-extensions-13
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From: "Zafar Ali (zali)" 
To: "Acee Lindem (acee)" , "lsr@ietf.org" 
CC: "Zafar Ali (zali)" 
Thread-Topic: [Lsr] LSR Working Group Last Call for "OSPFv3 Extensions for Segment Routing" - draft-ietf-ospf-ospfv3-segment-routing-extensions-13
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Date: Wed, 23 May 2018 19:34:01 +0000
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Subject: Re: [Lsr] LSR Working Group Last Call for "OSPFv3 Extensions for Segment Routing" - draft-ietf-ospf-ospfv3-segment-routing-extensions-13
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From: "Les Ginsberg (ginsberg)" 
To: Christian Hopps , "lsr@ietf.org" 
CC: "lsr-chairs@ietf.org" , "lsr-ads@ietf.org" 
Thread-Topic: [Lsr] WG Last Call for draft-ietf-lsr-isis-rfc7810bis-00
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Date: Wed, 23 May 2018 19:37:51 +0000
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Subject: Re: [Lsr] WG Last Call for draft-ietf-lsr-isis-rfc7810bis-00
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Support as co-author.

This is an important correction to publish in order to address a known inte=
roperability issue.

   Les

> -----Original Message-----
> From: Lsr  On Behalf Of Christian Hopps
> Sent: Wednesday, May 23, 2018 8:29 AM
> To: lsr@ietf.org
> Cc: lsr-chairs@ietf.org; lsr-ads@ietf.org; chopps@chopps.org
> Subject: [Lsr] WG Last Call for draft-ietf-lsr-isis-rfc7810bis-00
>=20
> Hi Folks,
>=20
> We're starting a 2 week WG Last Call on
>=20
>     https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-rfc7810bis/
>=20
> Please raise any objections or comments before Jun 6th, 2018.
>=20
> Thanks,
> Chris.
>=20
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr


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From: Jeff Tantsura 
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To: Christian Hopps 
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Subject: Re: [Lsr] WG Last Call for draft-ietf-lsr-isis-rfc7810bis-00
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Yes/support 

Regards,
Jeff

> On May 23, 2018, at 17:28, Christian Hopps  wrote:
> 
> Hi Folks,
> 
> We're starting a 2 week WG Last Call on
> 
>   https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-rfc7810bis/
> 
> Please raise any objections or comments before Jun 6th, 2018.
> 
> Thanks,
> Chris.
> 
> _______________________________________________
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> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr


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To: "Acee Lindem (acee)" 
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Subject: Re: [Lsr] LSR Working Group Last Call for "OSPFv3 Extensions for Segment Routing" - draft-ietf-ospf-ospfv3-segment-routing-extensions-13
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Support as co-author

Regards,
Jeff

> On May 23, 2018, at 17:03, Acee Lindem (acee)  wrote:
> 
> This begins an LSR WG last call for the subject draft. Please send your
> comments to this list prior to 12:00 AM GMT, June 7th, 2018.
> Thanks,
> Acee and Chris
>  
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr

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Support as co-author

        Regards,
        Jeff

        On May 23, 2018, at 17:03, Acee Lindem (acee) <acee@cisco.com> wrote:

        







        

        This begins an LSR WG last call for the subject draft. Please send your
        

        comments to this list prior to 12:00 AM GMT, June 7th, 2018.
        

        

        Thanks,
        

        Acee and Chris
        

         
        

        



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Support as co-author.

Peter

On 23/05/18 17:03 , Acee Lindem (acee) wrote:
> This begins an LSR WG last call for the subject draft. Please send your
>
> comments to this list prior to 12:00 AM GMT, June 7th, 2018.
>
> Thanks,
>
> Acee and Chris
>
>
>
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr
>


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I support the publication of this draft.

Thanks.
s.


> On May 23, 2018, at 5:03 PM, Acee Lindem (acee)  wrote:
> 
> This begins an LSR WG last call for the subject draft. Please send your
> comments to this list prior to 12:00 AM GMT, June 7th, 2018.
> Thanks,
> Acee and Chris
>  
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr


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From: stefano previdi 
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Subject: Re: [Lsr] WG Last Call for draft-ietf-lsr-isis-rfc7810bis-00
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support.

s.


> On May 23, 2018, at 5:28 PM, Christian Hopps  wrote:
> 
> Hi Folks,
> 
> We're starting a 2 week WG Last Call on
> 
>   https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-rfc7810bis/
> 
> Please raise any objections or comments before Jun 6th, 2018.
> 
> Thanks,
> Chris.
> 
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr


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Subject: Re: [Lsr] LSR Working Group Last Call for "OSPFv3 Extensions for Segment Routing" - draft-ietf-ospf-ospfv3-segment-routing-extensions-13
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    support.
        
    Regards,
        
    Dirk
        
    
        
    
        Op 23/05/2018 om 17:03 schreef Acee
      Lindem (acee):
        
    
        
    
        
      
      
      
      
        
        
        This begins
            an LSR WG last call for the subject draft. Please send your
        
        
        comments to
            this list prior to 12:00 AM GMT, June 7th, 2018.
        
        
        
        
        Thanks,
        
        
        Acee and
            Chris
        
        
        
      
        
      
        
      
        
      
        
      
        _______________________________________________
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https://www.ietf.org/mailman/listinfo/lsr

        
    
        
    
        
  



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From: Lizhenbin 
To: "Acee Lindem (acee)" , "lsr@ietf.org" 
Thread-Topic: [Lsr] LSR Working Group Last Call for "OSPFv3 Extensions for Segment Routing" - draft-ietf-ospf-ospfv3-segment-routing-extensions-13
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Subject: [Lsr] [Errata Held for Document Update] RFC7810 (5293)
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The following errata report has been held for document update 
for RFC7810, "IS-IS Traffic Engineering (TE) Metric Extensions". 

--------------------------------------
You may review the report below and at:
http://www.rfc-editor.org/errata/eid5293

--------------------------------------
Status: Held for Document Update
Type: Editorial

Reported by: Jeffrey Haas 
Date Reported: 2018-03-22
Held by: Alvaro Retana (IESG)

Section: 4.5-4.7

Original Text
-------------
    0                   1                   2                   3
    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |   Type        |     Length    |  RESERVED     |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                          Residual Bandwidth                   |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   where:

   Type: 37

   Length: 4

   RESERVED: This field is reserved for future use

Corrected Text
--------------
    0                   1                   2                   3
    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |   Type        |     Length    |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                          Residual Bandwidth                   |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   where:

   Type: 37

   Length: 4



Notes
-----
In sections 4.5, 4.6 and 4.7, a RESERVED field is in the diagram and the text.  However, the length field of each of these TLVs is 4.  The RESERVED field is thus not present and should be removed in future editions of this document.
===
The discussion in the WG is here: https://mailarchive.ietf.org/arch/msg/lsr/x5DlcGmwMPf9hvgL6mofNqGpbQA/

--------------------------------------
RFC7810 (draft-ietf-isis-te-metric-extensions-11)
--------------------------------------
Title               : IS-IS Traffic Engineering (TE) Metric Extensions
Publication Date    : May 2016
Author(s)           : S. Previdi, Ed., S. Giacalone, D. Ward, J. Drake, Q. Wu
Category            : PROPOSED STANDARD
Source              : IS-IS for IP Internets
Area                : Routing
Stream              : IETF
Verifying Party     : IESG


From nobody Thu May 24 23:40:51 2018
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From: Qin Wu 
To: Christian Hopps 
CC: "lsr@ietf.org" , "lsr-ads@ietf.org" , "lsr-chairs@ietf.org" 
Thread-Topic: [Lsr] WG Last Call for draft-ietf-lsr-isis-rfc7810bis-00
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Support.

-Qin

> On May 23, 2018, at 5:28 PM, Christian Hopps  wrote:
>=20
> Hi Folks,
>=20
> We're starting a 2 week WG Last Call on
>=20
>   https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-rfc7810bis/
>=20
> Please raise any objections or comments before Jun 6th, 2018.
>=20
> Thanks,
> Chris.
>=20
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr

_______________________________________________
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From nobody Fri May 25 01:36:18 2018
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Link State Routing WG of the IETF.

        Title           : YANG Data Model for IS-IS protocol
        Authors         : Stephane Litkowski
                          Derek Yeung
                          Acee Lindem
                          Jeffrey Zhang
                          Ladislav Lhotka
	Filename        : draft-ietf-isis-yang-isis-cfg-20.txt
	Pages           : 111
	Date            : 2018-05-25

Abstract:
   This document defines a YANG data model that can be used to configure
   and manage IS-IS protocol on network elements.



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-isis-yang-isis-cfg/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-isis-yang-isis-cfg-20
https://datatracker.ietf.org/doc/html/draft-ietf-isis-yang-isis-cfg-20

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-isis-yang-isis-cfg-20


Please note that it may take a couple of minutes from the time of submission
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Subject: [Lsr] I-D Action: draft-ietf-ospf-segment-routing-msd-14.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Link State Routing WG of the IETF.

        Title           : Signaling MSD (Maximum SID Depth) using OSPF
        Authors         : Jeff Tantsura
                          Uma Chunduri
                          Sam Aldrin
                          Peter Psenak
	Filename        : draft-ietf-ospf-segment-routing-msd-14.txt
	Pages           : 10
	Date            : 2018-05-28

Abstract:
   This document defines a way for an OSPF Router to advertise multiple
   types of supported Maximum SID Depths (MSDs) at node and/or link
   granularity.  Such advertisements allow entities (e.g., centralized
   controllers) to determine whether a particular SID stack can be
   supported in a given network.  This document defines only one type of
   MSD, but defines an encoding that can support other MSD types.  Here
   the term OSPF means both OSPFv2 and OSPFv3.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-ospf-segment-routing-msd/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-ospf-segment-routing-msd-14
https://datatracker.ietf.org/doc/html/draft-ietf-ospf-segment-routing-msd-14

A diff from the previous version is available at:
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Please note that it may take a couple of minutes from the time of submission
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From nobody Wed May 30 23:07:13 2018
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From: Jeff Tantsura 
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References: 
To: Muthu Arul Mozhi Perumal 
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Subject: Re: [Lsr] IGP TE Metric Extensions
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Muthu,

LSR would be a more suitable list to post to, CCed.

Regards,
Jeff

> On May 30, 2018, at 18:06, Muthu Arul Mozhi Perumal =
 wrote:
>=20
> Muthu


From nobody Thu May 31 07:35:49 2018
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Acee Lindem has requested publication of draft-ietf-ospf-segment-routing-msd-14 as Proposed Standard on behalf of the LSR working group.

Please verify the document's state at https://datatracker.ietf.org/doc/draft-ietf-ospf-segment-routing-msd/


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References:  
From: Muthu Arul Mozhi Perumal 
Date: Thu, 31 May 2018 21:44:54 +0530
Message-ID: 
To: Jeff Tantsura , lsr@ietf.org
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Archived-At: 
Subject: Re: [Lsr] IGP TE Metric Extensions
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Thanks, Jeff. Would be good to have this clarified
in draft-ginsberg-isis-rfc7810bis. My original message seems to have been
stripped off, so including it again for the lsr list..

=E2=80=8BBoth RFC 7810 and RFC 7471 say that:

   The measurement interval, any filter coefficients, and any
   advertisement intervals MUST be configurable per sub-TLV.

   Additionally, the default measurement interval for all sub-TLVs
   SHOULD be 30 seconds.

However, both RFCs initially say that they only describe mechanisms for
disseminating performance information and methods of measurements is
outside their scope.

Moreover, for a first time reader, it seems to suggest that the measurement
interval and filter coefficient must be supported and configurable under
the IGP. In a system supporting multiple IGPs, I would expect that they be
implemented outside the IGP and the IGPs just disseminate the information
provided to them.

Thoughts, especially from an implementation standpoint?

Regards.
Muthu

On Thu, May 31, 2018 at 11:37 AM, Jeff Tantsura 
wrote:

> Muthu,
>
> LSR would be a more suitable list to post to, CCed.
>
> Regards,
> Jeff
>
> > On May 30, 2018, at 18:06, Muthu Arul Mozhi Perumal <
> muthu.arul@gmail.com> wrote:
> >
> > Muthu
>

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        Thanks, Jeff. Would be good to have thi=
s clarified in=C2=A0draft-ginsberg-isis-rfc7810bis. My original message see=
ms to have been stripped off, so including it again for the lsr list..

        =E2=80=8BBoth RFC 7810 and=
 RFC 7471 say that:

        =C2=
=A0 =C2=A0The measurement interval, any filter coefficients, and any=

        =C2=A0 =C2=A0advertisement intervals MUST be configurable per sub-TLV.<=
/font>

        =C2=A0 =C2=A0Additionally, the default measurement=
 interval for all sub-TLVs
        =C2=A0 =C2=A0SHOULD be 30 seconds.

        However, both RFCs initially say that they only descr=
ibe mechanisms for disseminating performance information and methods of mea=
surements is outside their scope.
        =

        Moreover, for a =
first time reader, it seems to suggest that the measurement interval and fi=
lter coefficient must be supported and configurable under the IGP. In a sys=
tem supporting multiple IGPs, I would expect that they be implemented outsi=
de the IGP and the IGPs just disseminate the information provided to them.<=
/font>

        Thoughts, especially from an implementation standp=
oint?

        Regards.
        Muthu
        On Thu, May 31=
, 2018 at 11:37 AM, Jeff Tantsura <jefftant.ietf@gmail.com> wrote:
        Muthu,

        
LSR would be a more suitable list to post to, CCed.
        

        
Regards,
        
Jeff
        

        
> On May 30, 2018, at 18:06, Muthu Arul Mozhi Perumal <muthu.arul@gmail.com> wrote:
        
> 
        
> Muthu
        


        

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References:   
In-Reply-To: 
From: "Stefano Previdi (IETF)" 
Date: Thu, 31 May 2018 23:04:05 +0200
Message-ID: 
To: Muthu Arul Mozhi Perumal 
Cc: Jeff Tantsura , lsr@ietf.org
Content-Type: multipart/alternative; boundary="0000000000007b58c4056d86cfe5"
Archived-At: 
Subject: Re: [Lsr] IGP TE Metric Extensions
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On Thu, May 31, 2018, 6:15 PM Muthu Arul Mozhi Perumal 
wrote:

> Thanks, Jeff. Would be good to have this clarified
> in draft-ginsberg-isis-rfc7810bis. My original message seems to have been
> stripped off, so including it again for the lsr list..
>
> =E2=80=8BBoth RFC 7810 and RFC 7471 say that:
>
>    The measurement interval, any filter coefficients, and any
>    advertisement intervals MUST be configurable per sub-TLV.
>
>    Additionally, the default measurement interval for all sub-TLVs
>    SHOULD be 30 seconds.
>
> However, both RFCs initially say that they only describe mechanisms for
> disseminating performance information and methods of measurements is
> outside their scope.
>
> Moreover, for a first time reader, it seems to suggest that the
> measurement interval and filter coefficient must be supported and
> configurable under the IGP.
>


No. This is not suggested in any form.
It is clearly indicated that the draft does not deal with measurements
which means no recommendation is made.


In a system supporting multiple IGPs, I would expect that they be
> implemented outside the IGP and the IGPs just disseminate the information
> provided to them.
>
> Thoughts, especially from an implementation standpoint?
>


Again, the draft is only about dissemination, not measurements. If your
question is related to configuration and implementation of measurements,
well it will not be addressed by this draft.

We intentionally left out this part that does not belong to the igp
protocol machinery.

s.



> Regards.
> Muthu
>
> On Thu, May 31, 2018 at 11:37 AM, Jeff Tantsura 
> wrote:
>
>> Muthu,
>>
>> LSR would be a more suitable list to post to, CCed.
>>
>> Regards,
>> Jeff
>>
>> > On May 30, 2018, at 18:06, Muthu Arul Mozhi Perumal <
>> muthu.arul@gmail.com> wrote:
>> >
>> > Muthu
>>
>
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr
>

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        =
On Thu, May 31, 2018, 6:15 PM Muthu Arul Mozhi Perumal <muthu.arul@gmail.com> wrote:
        Thanks, Jeff. =
Would be good to have this clarified in=C2=A0draft-ginsberg-isis-rfc7810bis=
. My original message seems to have been stripped off, so including it agai=
n for the lsr list..

        =
=E2=80=8BBoth RFC 7810 and RFC 7471 say that:

        =C2=A0 =C2=A0The measurement interval, any filter coe=
fficients, and any
        =C2=A0 =C2=A0advertisement intervals MUST be c=
onfigurable per sub-TLV.

        =C2=A0 =C2=A0Additionally=
, the default measurement interval for all sub-TLVs
        =C2=A0 =C2=
=A0SHOULD be 30 seconds.

        However, both RFCs initia=
lly say that they only describe mechanisms for disseminating performance in=
formation and methods of measurements is outside their scope.
        <=
div class=3D"gmail_default">
        Moreover, for a first time reader, it seems to suggest that the=
 measurement interval and filter coefficient must be supported and configur=
able under the IGP.


        No. Thi=
s is not suggested in any form.
        It is clearly indica=
ted that the draft does not deal with measurements which means no recommend=
ation is made.


         In a system supporting multi=
ple IGPs, I would expect that they be implemented outside the IGP and the I=
GPs just disseminate the information provided to them.

        Thoughts, especially from an implementation standpoint?


        Again, the draft is only about disseminat=
ion, not measurements. If your question is related to configuration and imp=
lementation of measurements, well it will not be addressed by this draft.

        We intentionally left out=
 this part that does not belong to the igp protocol machinery.

        s.

        =


        =


        Regards.
        Muthu

        On Thu, May 31, 2018 at 11:37 AM, =
Jeff Tantsura <jefftant.ietf@gmail.com> wrote:
        Muthu,
        

        
LSR would be a more suitable list to post to, CCed.
        

        
Regards,
        
Jeff
        

        
> On May 30, 2018, at 18:06, Muthu Arul Mozhi Perumal <muthu.arul@g=
mail.com> wrote:
        
> 
        
> Muthu
        


        
_______________________________________________
        
Lsr mailing list
        
Lsr@ie=
tf.org
        
https://www.ietf.org/mailman/listinfo/lsr

        

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