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From: "Serpil Bayraktar (serpil)" <serpil@cisco.com>
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Thread-Topic: [OSPF] H-bit Support for OSPFv2 - draft-keyupate-ospf-ospfv2-hbit-01 WG Document Adoption Poll
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From: "Evelyn De Souza (evdesouz)" <evdesouz@cisco.com>
To: "ospf@ietf.org" <ospf@ietf.org>
Thread-Topic: [OSPF] H-bit Support for OSPFv2 - draft-keyupate-ospf-ospfv2-hbit-01 WG Document Adoption Poll
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Support
This draft was presented in Prague and there was consensus in the room
that it was a valid use case. It provides protocol mechanisms to
absolutely prevent transit traffic for OSPFv2 Routers (RFC 6987 only
discourages transit traffic). The draft also includes assurance of
backward compatibility.


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e-break: after-white-space; color: rgb(0, 0, 0); font-size: 14px; font-fami=
ly: Calibri, sans-serif;">
<div>Support</div>
<div>
<div style=3D"font-family: Calibri; font-size: 18px;">This draft was presen=
ted in Prague and there was consensus in the room</div>
<div style=3D"font-family: Calibri; font-size: 18px;">that it was a valid u=
se case. It provides protocol mechanisms to</div>
<div style=3D"font-family: Calibri; font-size: 18px;">absolutely prevent tr=
ansit traffic for OSPFv2 Routers (RFC 6987 only</div>
<div style=3D"font-family: Calibri; font-size: 18px;">discourages transit t=
raffic). The draft also includes assurance of</div>
<div style=3D"font-family: Calibri; font-size: 18px;">backward compatibilit=
y.</div>
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From: "Fred Baker (fred)" <fred@cisco.com>
To: "ospf@ietf.org" <ospf@ietf.org>
Thread-Topic: [OSPF] H-bit Support for OSPFv2 - draft-keyupate-ospf-ospfv2-hbit-01 WG Document Adoption Poll
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Subject: Re: [OSPF] H-bit Support for OSPFv2 - draft-keyupate-ospf-ospfv2-hbit-01 WG Document Adoption Poll
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I support this. I do think we need to move people to OSPFv3 rather than =
update OSPFv2, but this seems straightforward.

On 9/26/15, 12:04 PM, "Acee Lindem (acee)" <acee@cisco.com =
<mailto:acee@cisco.com>> wrote:

This draft was presented in Prague and there was consensus in the room
that it was a valid use case. It provides protocol mechanisms to
absolutely prevent transit traffic for OSPFv2 Routers (RFC 6987 only
discourages transit traffic). The draft also includes assurance of
backward compatibility.

Please indicate your support (or concerns) for adopting this as a WG
Document.

Thanks,
Acee


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<div class="">I support this. I do think we need to move people to OSPFv3 rather than update OSPFv2, but this seems straightforward.</div>
<div class=""><br class="">
</div>
<div class="">
<div style="font-family: Calibri;" class="">On 9/26/15, 12:04 PM, "Acee Lindem (acee)" &lt;<a href="mailto:acee@cisco.com" class="">acee@cisco.com</a>&gt; wrote:</div>
<div style="font-family: Calibri;" class=""><br class="">
</div>
<blockquote id="MAC_OUTLOOK_ATTRIBUTION_BLOCKQUOTE" style="font-family: Calibri; border-left-color: rgb(181, 196, 223); border-left-width: 5px; border-left-style: solid; padding: 0px 0px 0px 5px; margin: 0px 0px 0px 5px;" class="">
<div class="">This draft was presented in Prague and there was consensus in the room</div>
<div class="">that it was a valid use case. It provides protocol mechanisms to</div>
<div class="">absolutely prevent transit traffic for OSPFv2 Routers (RFC 6987 only</div>
<div class="">discourages transit traffic). The draft also includes assurance of</div>
<div class="">backward compatibility.</div>
<div class=""><br class="">
</div>
<div class="">Please indicate your support (or concerns) for adopting this as a WG</div>
<div class="">Document.</div>
<div class=""><br class="">
</div>
<div class="">Thanks,</div>
<div class="">Acee</div>
<div class=""><br class="">
</div>
<div class=""><br class="">
</div>
<div class="">_______________________________________________</div>
<div class="">OSPF mailing list</div>
<div class=""><a href="mailto:OSPF@ietf.org" class="">OSPF@ietf.org</a></div>
<div class=""><a href="https://www.ietf.org/mailman/listinfo/ospf" class="">https://www.ietf.org/mailman/listinfo/ospf</a></div>
<div class=""><br class="">
</div>
</blockquote>
</div>


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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: "Acee Lindem (acee)" <acee@cisco.com>, OSPF WG List <ospf@ietf.org>
Thread-Topic: H-bit Support for OSPFv2 - draft-keyupate-ospf-ospfv2-hbit-01 WG Document Adoption Poll
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Support - similar functionality has proven to be useful in both IS-IS and O=
SPFv3.

  Les

> -----Original Message-----
> From: OSPF [mailto:ospf-bounces@ietf.org] On Behalf Of Acee Lindem
> (acee)
> Sent: Saturday, September 26, 2015 12:05 PM
> To: OSPF WG List
> Subject: [OSPF] H-bit Support for OSPFv2 - draft-keyupate-ospf-ospfv2-hbi=
t-
> 01 WG Document Adoption Poll
>=20
> This draft was presented in Prague and there was consensus in the room th=
at
> it was a valid use case. It provides protocol mechanisms to absolutely pr=
event
> transit traffic for OSPFv2 Routers (RFC 6987 only discourages transit tra=
ffic).
> The draft also includes assurance of backward compatibility.
>=20
> Please indicate your support (or concerns) for adopting this as a WG
> Document.
>=20
> Thanks,
> Acee
>=20
>=20
> _______________________________________________
> OSPF mailing list
> OSPF@ietf.org
> https://www.ietf.org/mailman/listinfo/ospf


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Support

On 09/26/2015 12:04 PM, Acee Lindem (acee) wrote:
> This draft was presented in Prague and there was consensus in the room
> that it was a valid use case. It provides protocol mechanisms to
> absolutely prevent transit traffic for OSPFv2 Routers (RFC 6987 only
> discourages transit traffic). The draft also includes assurance of
> backward compatibility.
>
> Please indicate your support (or concerns) for adopting this as a WG
> Document.
>
> Thanks,
> Acee
>
>
> _______________________________________________
> OSPF mailing list
> OSPF@ietf.org
> https://www.ietf.org/mailman/listinfo/ospf
> .
>


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From: Jeff Tantsura <jeff.tantsura@ericsson.com>
To: "Acee Lindem (acee)" <acee@cisco.com>, OSPF WG List <ospf@ietf.org>
Thread-Topic: [OSPF] H-bit Support for OSPFv2 - draft-keyupate-ospf-ospfv2-hbit-01 WG Document Adoption Poll
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Subject: Re: [OSPF] H-bit Support for OSPFv2 - draft-keyupate-ospf-ospfv2-hbit-01 WG Document Adoption Poll
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Yes/support

Cheers,
Jeff




-----Original Message-----
From: "Acee Lindem   (acee)" <acee@cisco.com>
Date: Saturday, September 26, 2015 at 12:04 PM
To: "ospf@ietf.org" <ospf@ietf.org>
Subject: [OSPF] H-bit Support for OSPFv2 -
draft-keyupate-ospf-ospfv2-hbit-01 WG Document Adoption Poll

>This draft was presented in Prague and there was consensus in the room
>that it was a valid use case. It provides protocol mechanisms to
>absolutely prevent transit traffic for OSPFv2 Routers (RFC 6987 only
>discourages transit traffic). The draft also includes assurance of
>backward compatibility.
>
>Please indicate your support (or concerns) for adopting this as a WG
>Document.
>
>Thanks,
>Acee
>
>
>_______________________________________________
>OSPF mailing list
>OSPF@ietf.org
>https://www.ietf.org/mailman/listinfo/ospf


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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Shraddha Hegde <shraddha@juniper.net>, Manav Bhatia <manavbhatia@gmail.com>
Thread-Topic: [OSPF] OSPF Link Overload - draft-hegde-ospf-link-overload-01
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From: "Acee Lindem (acee)" <acee@cisco.com>
To: "Anil Kumar S N (VRP Network BL)" <anil.sn@huawei.com>, Pushpasis Sarkar <psarkar@juniper.net>, "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, Shraddha Hegde <shraddha@juniper.net>
Thread-Topic: OSPF Link Overload  - draft-hegde-ospf-link-overload-01
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Date: Mon, 5 Oct 2015 13:48:11 +0000
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References: <D22B605B.32E55%acee@cisco.com> <BY1PR0501MB1381B0343F37E534E2CFAB8DD54F0@BY1PR0501MB1381.namprd05.prod.outlook.com> <D22EB65C.32FF9%acee@cisco.com> <BY1PR0501MB138107954EB733C69D388CC7D54E0@BY1PR0501MB1381.namprd05.prod.outlook.com> <D22FF12A.3323C%acee@cisco.com> <F41DF673-765D-44B2-9499-E47F3D2EABB7@juniper.net> <D22FFBCB.3325F%acee@cisco.com> <0E0FB058-0DC6-49BD-95BC-6E64584B1DAD@juniper.net> <C4D23725-19FA-4B30-9496-486836E001DA@cisco.com> <03C3AD8C-BA1F-4951-BE7E-367C95535484@juniper.net> <BY1PR0501MB1381D96FA2F88CF374D7E3C8D54E0@BY1PR0501MB1381.namprd05.prod.outlook.com> <ba7d718a973d4f17aa0d3392ad9d04c0@XCH-ALN-001.cisco.com> <BY1PR0501MB13810C3D18F95BCADEE0D12BD54D0@BY1PR0501MB1381.namprd05.prod.outlook.com> <39fe6e2522b0468c8eccff66ec701555@XCH-ALN-001.cisco.com> <6A3F4D8E-4D4F-4E9B-8026-1445B73F9BDE@juniper.net> <327562D94EA7BF428CD805F338C31EF06C06250B@nkgeml512-mbx.china.huawei.com>
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Subject: Re: [OSPF] OSPF Link Overload  - draft-hegde-ospf-link-overload-01
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From: "Anil Kumar S N (VRP Network BL)" <anil.sn@huawei.com>
To: "Acee Lindem (acee)" <acee@cisco.com>, Pushpasis Sarkar <psarkar@juniper.net>, "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, Shraddha Hegde <shraddha@juniper.net>
Thread-Topic: OSPF Link Overload  - draft-hegde-ospf-link-overload-01
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Date: Mon, 5 Oct 2015 14:17:25 +0000
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References: <D22B605B.32E55%acee@cisco.com> <BY1PR0501MB1381B0343F37E534E2CFAB8DD54F0@BY1PR0501MB1381.namprd05.prod.outlook.com> <D22EB65C.32FF9%acee@cisco.com> <BY1PR0501MB138107954EB733C69D388CC7D54E0@BY1PR0501MB1381.namprd05.prod.outlook.com> <D22FF12A.3323C%acee@cisco.com> <F41DF673-765D-44B2-9499-E47F3D2EABB7@juniper.net> <D22FFBCB.3325F%acee@cisco.com> <0E0FB058-0DC6-49BD-95BC-6E64584B1DAD@juniper.net> <C4D23725-19FA-4B30-9496-486836E001DA@cisco.com> <03C3AD8C-BA1F-4951-BE7E-367C95535484@juniper.net> <BY1PR0501MB1381D96FA2F88CF374D7E3C8D54E0@BY1PR0501MB1381.namprd05.prod.outlook.com> <ba7d718a973d4f17aa0d3392ad9d04c0@XCH-ALN-001.cisco.com> <BY1PR0501MB13810C3D18F95BCADEE0D12BD54D0@BY1PR0501MB1381.namprd05.prod.outlook.com> <39fe6e2522b0468c8eccff66ec701555@XCH-ALN-001.cisco.com> <6A3F4D8E-4D4F-4E9B-8026-1445B73F9BDE@juniper.net> <327562D94EA7BF428CD805F338C31EF06C06250B@nkgeml512-mbx.china.huawei.com> <D237F757.33DDD%acee@cisco.com>
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Cc: Hannes Gredler <hannes@gredler.at>, OSPF WG List <ospf@ietf.org>, Mohan Nanduri <mnanduri@microsoft.com>, "Jalil, Luay" <luay.jalil@verizon.com>
Subject: Re: [OSPF] OSPF Link Overload  - draft-hegde-ospf-link-overload-01
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From: Shraddha Hegde <shraddha@juniper.net>
To: "Acee Lindem (acee)" <acee@cisco.com>, Manav Bhatia <manavbhatia@gmail.com>
Thread-Topic: [OSPF] OSPF Link Overload - draft-hegde-ospf-link-overload-01
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Subject: Re: [OSPF] OSPF Link Overload - draft-hegde-ospf-link-overload-01
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From: "Acee Lindem (acee)" <acee@cisco.com>
To: "Anil Kumar S N (VRP Network BL)" <anil.sn@huawei.com>, Pushpasis Sarkar <psarkar@juniper.net>, "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, Shraddha Hegde <shraddha@juniper.net>
Thread-Topic: OSPF Link Overload  - draft-hegde-ospf-link-overload-01
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Date: Mon, 5 Oct 2015 16:03:08 +0000
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Cc: Hannes Gredler <hannes@gredler.at>, OSPF WG List <ospf@ietf.org>, Mohan Nanduri <mnanduri@microsoft.com>, "Jalil, Luay" <luay.jalil@verizon.com>
Subject: Re: [OSPF] OSPF Link Overload  - draft-hegde-ospf-link-overload-01
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From: Shraddha Hegde <shraddha@juniper.net>
To: "draft-ietf-ospf-two-part-metric@ietf.org" <draft-ietf-ospf-two-part-metric@ietf.org>
Thread-Topic: draft-ietf-ospf-two-part-metric : Max metric handling
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Subject: [OSPF] draft-ietf-ospf-two-part-metric : Max metric handling
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Authors,

As per my understanding of the draft, SPF calculation uses sum of metric fr=
om the interface cost and the network to router cost advertised by the neig=
hbor.
Handling of MAX metric is not described in the draft.  Since the metric wil=
l be sum of 2 16 bit numbers it can exceed the normal 0xffff metric value a=
nd the draft should talk about how to handle these cases.

Rgds
Shraddha



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<font face=3D"Calibri" size=3D"2"><span style=3D"font-size:11pt;">
<div>Authors,</div>
<div>&nbsp;</div>
<div>As per my understanding of the draft, SPF calculation uses sum of metr=
ic from the interface cost and the network to router cost advertised by the=
 neighbor.</div>
<div>Handling of MAX metric is not described in the draft.&nbsp; Since the =
metric will be sum of 2 16 bit numbers it can exceed the normal 0xffff metr=
ic value and the draft should talk about how to handle these cases.</div>
<div>&nbsp;</div>
<div>Rgds</div>
<div>Shraddha</div>
<div>&nbsp;</div>
<div>&nbsp;</div>
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From nobody Tue Oct  6 08:23:19 2015
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Date: Tue, 6 Oct 2015 16:23:03 +0100
From: Rob Shakir <rjs@rob.sh>
To: "=?utf-8?Q?as=40cisco.com?=" <as@cisco.com>,  =?utf-8?Q?Black=2C_David?= <david.black@emc.com>,  "=?utf-8?Q?bruno.decraene=40orange.com?=" <bruno.decraene@orange.com>,  "=?utf-8?Q?ops-dir=40ietf.org?=" <ops-dir@ietf.org>,  "=?utf-8?Q?shraddha=40juniper.net?=" <shraddha@juniper.net>,  "=?utf-8?Q?General_Area_Review_Team_(gen-art=40ietf.org)?=" <gen-art@ietf.org>, "=?utf-8?Q?lizhenbin=40huawei.com?=" <lizhenbin@huawei.com>
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Subject: Re: [OSPF] Gen-ART and OPS-Dir review of draft-ietf-ospf-node-admin-tag-06
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Hi David,

On October 6, 2015 at 00:37:42, Black, David (david.black=40emc.com) wrot=
e:
> > As an OPS-Dir member, I'm concerned by the above R=46C 5706 answers, =
=20
> and in particular treating all operational issues as vendor- =20
> and/or
> operator-specific. One possible alternative would be to scope =20
> the
> draft down to interoperably specify what's needed for L=46A

I=E2=80=99ll quote this part of your mail, but respond to the general que=
stion around whether this draft should be tighter scoped (and the operati=
onal considerations of what one can do with the mechanism).

In general, this mechanism is meant to give ways for an operator to add t=
heir own logic on-top of the routing protocol selection of the OSP=46 pro=
tocol. Specifically, this is for the case where there are sets of paths t=
hat OSP=46 considers valid, but the operator has a particular preference =
for a particular subset to be included or excluded. To this end, the harm=
 that one can do by preferring paths with a particular admin tag (or set =
of admin tags) on them is simply to select a subset of the paths that wou=
ld have been used anwyay.=C2=A0

So, from the examples in the document, the admin tag lets one:

	* Prefer a specific L=46A from a set of valid=C2=A0L=46As. The operator =
has a business reason to prefer specific ones (e.g., OSP=46 metric is set=
 based on bandwidth, but we want to minimise latency, or we only want to =
capacity plan for =46RR between P nodes never transiting a PE). There are=
 many different reasons that one might have this preference, and they wil=
l be different by operator - so, removing the ability of an operator to s=
pecify arbitrary tags will make this mechanism ineffective. Whilst there =
could be unintended consequences of preferring specific L=46As, actually =
there are probably worse consequences of NOT preferring particular L=46As=
, such as traffic going via a PE in another country such that latency is =
increased over all other L=46As. Bruno and Stephane from =46T have given =
many examples of this in the L=46A manageability drafts presented in RTGW=
G. The admin tag will never result in a new L=46A that would never have b=
een selected via the standardised mechanisms being selected - so, in my v=
iew, has little potential to cause new =E2=80=98harm=E2=80=99.
	=09
	* Prefer a specific path from a set of paths. This is similar to the cas=
e above. No new candidate path is being added to the routes that could be=
 used by the admin tag mechanism. It simply says that when a device that =
must select N ECMPs to install from M candiates (N < M), then the operato=
r can influence which based on the admin tag. All are still valid ECMPs -=
 so new risk is created. Again, selecting a particular subset of that M w=
ithout any consideration may be more harmful than doing the operator-spec=
ific selection. Again, the logic of which are =E2=80=98OK=E2=80=99 PEs an=
d which are not is something that is operator specific, and may only appl=
y to a subset of applications using OSP=46 to select paths (an example of=
 this is devices that do not scale well as MPLS-TE midpoints, but are OK =
for transit IP traffic - at this point, we may want to influence CSP=46 t=
o stay away from them, but not IP - the fact that these devices are =E2=80=
=98not-OK-for-transit-MPLS-TE=E2=80=99 is not something that we can easil=
y enumerate and standardise).

Given that we are really selecting candidates from within a set of paths =
that have already been selected by OSP=46 as valid, and usable - then I=E2=
=80=99m not sure that I can understand the logic behind this sentence fro=
m your review: =22There appears to be more than enough enabled by this dr=
aft to wreak serious operational havoc=E2=80=9D.

I strongly disagree with the idea that we should try and enumerate what t=
he tags should be, rather than maintain the ability of an operator to add=
 their own specific logic with these tags. This is what is done today wit=
h link affinity, or tags elsehwere in the IGP protocols.=C2=A0

Re-reading the draft, perhaps we need to clarify that this does not chang=
e the underlying SP=46 process that OSP=46 uses today - would this addres=
s your concern=3F

Regards,
r.




From nobody Tue Oct  6 09:39:57 2015
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From: <bruno.decraene@orange.com>
To: "Black, David" <david.black@emc.com>
Thread-Topic: Gen-ART and OPS-Dir review of draft-ietf-ospf-node-admin-tag-06
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Subject: Re: [OSPF] Gen-ART and OPS-Dir review of draft-ietf-ospf-node-admin-tag-06
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Hi David,

Thanks for your careful review.

Regarding you major issue:

> ---- Major issues: ----
>=20
> [1] Operational considerations:  There appears to be more than enough
> enabled by this draft to wreak serious operational havoc, but the draft
> seems to sidestep all operational topics, primarily by treating all
> usage of tags as vendor- or implementation- specific and trusting the
> vendors and operators not to foul things up.  I'm not sure that's wise.


May be the draft is missing some text on some points, but I don't share thi=
s _major_ concern (regarding the operation use of tags):
- their use in routing protocols is not new and we have a large operational=
 feedback on this. e.g. 8 years with IS-IS prefix tags (RFC 5130), and espe=
cially 20 years with BGP community (RFC 1997) which are heavily used by all=
 network operators, including between Autonomous System/Administrative Doma=
ins (which is beyond OSPF usage)
- they are meant to ease network operation. We could probably do everything=
 you can think of without node tags, e.g. by referencing each node individu=
ally using its loopback address or router ID. But this would be more error =
prone and difficult to maintain over time.  I would note that the abstract =
of RFC 1997 states that BGP community has been defined to "reduce the manag=
ement complexity of maintaining the Internet".=20


And +1 on Rob's comment

Regards,
Bruno

> From: Black, David [mailto:david.black@emc.com] > Sent: Tuesday, October =
06, 2015 1:35 AM
>=20
> This is a combined Gen-ART and OPS-Dir review.  Boilerplate for both foll=
ows
> ...
>=20
> I am the assigned Gen-ART reviewer for this draft. For background on
> Gen-ART, please see the FAQ at:
>=20
> <http://wiki.tools.ietf.org/area/gen/trac/wiki/GenArtfaq>.
>=20
> Please resolve these comments along with any other Last Call comments
> you may receive.
>=20
> I have reviewed this document as part of the Operational directorate's
> ongoing
> effort to review all IETF documents being processed by the IESG.  These
> comments
> were written primarily for the benefit of the operational area directors.
> Document editors and WG chairs should treat these comments just like any
> other
> last call comments.
>=20
> Document: draft-ietf-ospf-node-admin-tag-06
> Reviewer: David Black
> Review Date: October 5, 2015
> IETF LC End Date: October 8, 2015
> IESG Telechat date: October 15, 2015
>=20
> Summary:  This draft is on the right track, but has open issues
>  		described in the review.
>=20
> This is a generally well-written draft about adding administrative tags f=
or
> operational use to OSPF.  The draft is clear, and the material on how the
> tags could be used is helpful, although raises a number of concerns about
> the consequences of the intended usage of these tags.
>=20
> ---- Major issues: ----
>=20
> [1] Operational considerations:  There appears to be more than enough
> enabled by this draft to wreak serious operational havoc, but the draft
> seems to sidestep all operational topics, primarily by treating all
> usage of tags as vendor- or implementation- specific and trusting the
> vendors and operators not to foul things up.  I'm not sure that's wise.
>=20
> See end of OPS-Dir review below for more on this concern.
>=20
> --- Minor issues: ----
>=20
> -- 3.2 Elements of procedure:
>=20
> [A] I see what look like some underspecified requirements:
>=20
>    Each tag SHOULD be treated as an independent identifier that MAY be
>    used in policy to perform a policy action.
>=20
>    The administrative tag list within the
>    TLV SHOULD be considered an unordered list.
>=20
> Why are those two not "MUST" requirements?  What happens if either
> is not done?
>=20
> [B] Tag set completeness:
>=20
>    Multiple node administrative tag TLVs MAY appear in an RI LSA or
>    multiple node administrative tag TLVs MAY be contained in different
>    instances of the RI LSA.  The node administrative tags associated
>    with a node for the purpose of any computation or processing SHOULD
>    be a superset of node administrative tags from all the TLVs in all
>    instances of the RI LSA originated by that node.
>=20
> This paragraph is about processing at that node.  It's easy to misread,
> as that implication is buried in the word "originated" in the last line.
> Suggested change:
>=20
> 	"for the purpose of any computation or processing SHOULD" ->
> 	"for the purpose of any computation or processing performed
> 		at that node SHOULD"
>=20
> Also, it looks like it's acceptable for other nodes to perform such
> computation or processing based on a partial tag set for this node
> (e.g., when some other node has not received all the RI LSAs with all
> the tags).  That should be stated.
>=20
> [C] Tag change/removal:
>=20
>    When there is a change in the node administrative tag TLV or removal/
>    addition of a TLV in any instance of the RI-LSA, implementations MUST
>    take appropriate measures to update its state according to the
>    changed set of tags.  Exact actions depend on features working with
>    administrative tags and is outside of scope of this specification.
>=20
> Inability to interoperably remove a tag value (e.g., distribute the
> update that tag X no longer applies to node Q) seems like a significant
> omission, but I'm not a routing expert, so I'll defer to the WG's and
> ADs' judgment on the importance of this.  At a minimum, the rationale
> for not specifying an interoperable tag value removal mechanism ought
> to be added to this document.
>=20
> [D] No management support
>=20
> From OPS-Dir Q&A: At a minimum, reporting of tag values ought to be
> defined via an OSPF MIB extension or analogous functionality.
>=20
> --- Nits/editorial comments: ----
>=20
> -- 1.  Introduction
>=20
> The Abstract says that the tags are for "route and path selection"; the
> Introduction should also say that.  Suggestion - at the end of this sente=
nce
> in the first paragraph:
>=20
>    It is useful to assign a per-node administrative tag to a router in
>    the OSPF domain and use it as an attribute associated with the node.
>=20
> add the text "for route and path selection".  This will help with the
> second sentence in the second paragraph:
>=20
>    Path selection is a functional set
>    which applies both to TE and non-TE applications and hence new TLV
>    for carrying per-node administrative tags is included in Router
>    Information LSA [RFC4970] .
>=20
> If "path selection" and "functional set" are specific terms with
> specialized meaning in OSPF context, that sentence is fine as-is,
> otherwise it would read better if it began with:
>=20
>    Route and path selection functionality applies to both ...
>=20
> -- 3.1.  TLV format
>=20
>    Type : TBA, Suggested value 10
>=20
> Please add an RFC Editor Note asking the RFC Editor to replace this with
> the actual IANA-assigned value.
>=20
> -- 3.2.  Elements of procedure
>=20
> While it's obvious that tag usage should be confined to the administrative
> domain that understands the tag, it's worth stating.  At the end of this
> sentence:
>=20
>    Interpretation of tag values is specific to the administrative domain
>    of a particular network operator.
>=20
> I'd suggest adding:
>=20
>    , and hence tag values SHOULD NOT be propagated outside the
>    administrative domain to which they apply.
>=20
> -- 4.4.  Mobile back-haul network service deployment
>=20
> Please expand "eNodeB" acronym on first use.
>=20
> -- 4.5.  Explicit routing policy
>=20
> In Figure 3:
> - The link from the leftmost pair of A nodes to the pair of T nodes
>    do not have link weights.
> - The link from the left R node to the left T node does not have a
>    link weight
> - The following example of an explicitly routed policy:
>=20
>       - Traffic from A nodes to I nodes must not go through R and T
>       	nodes
>=20
>     prevents the leftmost pair of A nodes from sending traffic to the
>     I nodes.  Was this "black hole" intended as part of the example?
>=20
> Also: "explicitly routed policies" -> "explicit routing policies"
>=20
> - 5. Security considerations
>=20
> I'd add discussion that advertisement of tag values for one administrative
> domain into another risks misinterpretation of the tag values (if the two
> domains have assigned different meanings to the same values), which may
> have undesirable and unanticipated side effects.
>=20
> In addition, injection of tag values from the outside (e.g., forge OSPF
> traffic that appears to be from a node in the domain and carries
> administrative tag values) is at least a possible denial-of-service attack
> vector, and could also be used for more nefarious purposes (e.g., reroute
> otherwise unobservable [to the attacker] VPN traffic via a route where
> the attacker can observe it).
>=20
> idnits 2.13.02 did not find any nits.
>=20
> ---- Selected RFC 5706 Appendix A Q&A for OPS-Dir review ----
>=20
> A.1.2.  Has installation and initial setup been discussed?
> A.1.5.  Has the impact on network operation been discussed?
> A.1.6.  Have suggestions for verifying correct operation been discussed?
>=20
> 	No - given the impact that these tags could have on route and path
> 		computation, likely implementations will be powerful "guns"
> 		with which network operators can readily shoot themselves
> 		in far more than just their "feet."  These
> 		considerations would have to be documented based on the
> 		specific uses made of these tags by specific implementations
> 		and deployments.  All of that appears to be outside the scope
> 		of this draft.
>=20
> A.1.7.  Has management interoperability been discussed?
>=20
> 	No - at a minimum, reporting of tag values ought to be defined
> 		via an OSPF MIB extension or analogous functionality.
> 		This is minor issue [D].
>=20
> A.1.8.  Are there fault or threshold conditions that should be reported?
>=20
> 	Yes, but they're implementation-specific - see response to
> 		A.1.[2,5,6] above.
>=20
> A.2.  Management Considerations
>    Do you anticipate any manageability issues with the specification?
>=20
> 	Yes, manageability has been largely ignored.
>=20
> A.3.  Documentation
>=20
>    Is an operational considerations and/or manageability section part of
>    the document?
>=20
> 	No.
>=20
>    Does the proposed protocol have a significant operational impact on
>    the Internet?
>=20
> 	Yes, the anticipated uses will.
>=20
>    Is there proof of implementation and/or operational experience?
>=20
> 	Nothing was stated in the draft or shepherd write-up.
>=20
> As an OPS-Dir member, I'm concerned by the above RFC 5706 answers,
> and in particular treating all operational issues as vendor- and/or
> operator-specific.  One possible alternative would be to scope the
> draft down to interoperably specify what's needed for LFA, as
> indicated by this answer from the Shepherd write-up:
>=20
> (9) How solid is the WG consensus behind this document? Does it
>     represent the strong concurrence of a few individuals, with others
>     being silent, or does the WG as a whole understand and agree with it?
>=20
>       There is consensus from the WG and others outside the WG that
>       this document can progress. It complements work done on LFA
>       manageability in the RTG Working Group.
>=20
> Another alternative could be Experimental RFC status for the full
> tag mechanism (e.g., to figure out what it'll be used for in practice,
> how and why) rather than Proposed Standard.
>=20
> This is major issue [1].
>=20
> Thanks,
> --David
> ----------------------------------------------------
> David L. Black, Distinguished Engineer
> EMC Corporation, 176 South St., Hopkinton, MA=A0 01748
> +1 (508) 293-7953=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 FAX: +1 (508) 293-7=
786
> david.black@emc.com=A0=A0=A0=A0=A0=A0=A0 Mobile: +1 (978) 394-7754
> ----------------------------------------------------
>=20


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From nobody Tue Oct  6 10:22:10 2015
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Date: Tue, 6 Oct 2015 18:21:53 +0100
From: Rob Shakir <rjs@rob.sh>
To: "=?utf-8?Q?as=40cisco.com?=" <as@cisco.com>,  "=?utf-8?Q?bruno.decraene=40orange.com?=" <bruno.decraene@orange.com>,  =?utf-8?Q?Black=2C_David?= <david.black@emc.com>,  "=?utf-8?Q?ops-dir=40ietf.org?=" <ops-dir@ietf.org>,  "=?utf-8?Q?shraddha=40juniper.net?=" <shraddha@juniper.net>,  "=?utf-8?Q?General_Area_Review_Team_(gen-art=40ietf.org)?=" <gen-art@ietf.org>, "=?utf-8?Q?lizhenbin=40huawei.com?=" <lizhenbin@huawei.com>
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Subject: Re: [OSPF] Gen-ART and OPS-Dir review of draft-ietf-ospf-node-admin-tag-06
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On October 6, 2015 at 17:46:41, Black, David (david.black=40emc.com) wrot=
e:
> Rob,
> =20
> > Given that we are really selecting candidates from within a set of pa=
ths that
> > have already been selected by OSP=46 as valid, and usable - then I=E2=
=80=99m not sure
> > that I can understand the logic behind this sentence from your review=
: =22There
> > appears to be more than enough enabled by this draft to wreak serious=

> > operational havoc=E2=80=9D.
> =20
> Perhaps, I'm not understanding something, but I thought I saw an unreac=
hability
> problem in the example in Section 4.5/=46igure 3:
> =20
> - The following example of an explicitly routed policy:
> =20
> - Traffic from A nodes to I nodes must not go through R and T
> nodes
> =20
> prevents the leftmost pair of A nodes from sending traffic to the
> I nodes. Was this =22black hole=22 intended as part of the example=3F
> =20
> Was that a mistake, and at least one path from the leftmost pair of A n=
odes
> to the I nodes will be selected despite that =22explicitly routed polic=
y=E2=80=9D=3F

If the operator chooses to deny prefixes being installed in the RIB based=
 on these tags, then yes, they could end up with unreachability problems.=
 However, an operator can do this today with any routing policy (a number=
 of implementations already have inbound route filtering) - we should not=
 prevent this kind of mechanism based on the fact that an erroneous confi=
g might be problematic.

In the case that the operator *preferences* things based on the tags, the=
n this would not be an unreachability problem - OSP=46 would still correc=
tly determine that there is a path between all nodes in the pictured netw=
ork - and this would be installed in the RIB as per normal operation.

(My memory is not 100% clear on whether this is intended as part of the e=
xample, if it is, then the text should be clarified I agree.)

Kind regards,
r.


From nobody Wed Oct  7 00:08:35 2015
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To: "Black, David" <david.black@emc.com>, Rob Shakir <rjs@rob.sh>, "as@cisco.com" <as@cisco.com>, "bruno.decraene@orange.com" <bruno.decraene@orange.com>, "ops-dir@ietf.org" <ops-dir@ietf.org>, "General Area Review Team (gen-art@ietf.org)" <gen-art@ietf.org>, "lizhenbin@huawei.com" <lizhenbin@huawei.com>
Thread-Topic: Gen-ART and OPS-Dir review of draft-ietf-ospf-node-admin-tag-06
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Subject: Re: [OSPF] Gen-ART and OPS-Dir review of draft-ietf-ospf-node-admin-tag-06
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Content-Type: text/plain; name="draft-ietf-ospf-node-admin-tag-07.txt"
Content-Description: draft-ietf-ospf-node-admin-tag-07.txt
Content-Disposition: attachment;
	filename="draft-ietf-ospf-node-admin-tag-07.txt"; size=29986;
	creation-date="Wed, 07 Oct 2015 07:03:37 GMT";
	modification-date="Wed, 07 Oct 2015 07:03:37 GMT"
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To: Shraddha Hegde <shraddha@juniper.net>, "Black, David" <david.black@emc.com>
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From: "Black, David" <david.black@emc.com>
To: Shraddha Hegde <shraddha@juniper.net>, Rob Shakir <rjs@rob.sh>, "as@cisco.com" <as@cisco.com>, "bruno.decraene@orange.com" <bruno.decraene@orange.com>, "ops-dir@ietf.org" <ops-dir@ietf.org>, "General Area Review Team (gen-art@ietf.org)" <gen-art@ietf.org>, "lizhenbin@huawei.com" <lizhenbin@huawei.com>
Thread-Topic: Gen-ART and OPS-Dir review of draft-ietf-ospf-node-admin-tag-06 - Editorial comments and nits
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Cc: "ospf@ietf.org" <ospf@ietf.org>, "Black, David" <david.black@emc.com>, "ietf@ietf.org" <ietf@ietf.org>
Subject: Re: [OSPF] Gen-ART and OPS-Dir review of draft-ietf-ospf-node-admin-tag-06 - Editorial comments and nits
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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Shraddha Hegde <shraddha@juniper.net>, "draft-ietf-ospf-two-part-metric@ietf.org" <draft-ietf-ospf-two-part-metric@ietf.org>
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From: Shraddha Hegde <shraddha@juniper.net>
To: "Black, David" <david.black@emc.com>, Rob Shakir <rjs@rob.sh>, "as@cisco.com" <as@cisco.com>, "bruno.decraene@orange.com" <bruno.decraene@orange.com>, "ops-dir@ietf.org" <ops-dir@ietf.org>, "General Area Review Team (gen-art@ietf.org)" <gen-art@ietf.org>, "lizhenbin@huawei.com" <lizhenbin@huawei.com>
Thread-Topic: Gen-ART and OPS-Dir review of draft-ietf-ospf-node-admin-tag-06: A-D  issues
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Subject: Re: [OSPF] Gen-ART and OPS-Dir review of draft-ietf-ospf-node-admin-tag-06: A-D issues
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Content-Type: text/plain; name="draft-ietf-ospf-node-admin-tag-07.txt"
Content-Description: draft-ietf-ospf-node-admin-tag-07.txt
Content-Disposition: attachment;
	filename="draft-ietf-ospf-node-admin-tag-07.txt"; size=31256;
	creation-date="Wed, 07 Oct 2015 07:03:37 GMT";
	modification-date="Thu, 08 Oct 2015 12:01:04 GMT"
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From: Shraddha Hegde <shraddha@juniper.net>
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Thread-Topic: Gen-ART and OPS-Dir review of draft-ietf-ospf-node-admin-tag-06 - Editorial comments and nits
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Subject: Re: [OSPF] Gen-ART and OPS-Dir review of draft-ietf-ospf-node-admin-tag-06 - Editorial comments and nits
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From: Alan Davey <Alan.Davey@metaswitch.com>
To: "ospf@ietf.org" <ospf@ietf.org>
Thread-Topic: draft-ietf-ospf-yang-02 questions and doubts
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Subject: [OSPF] draft-ietf-ospf-yang-02 questions and doubts
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Folks

I have read draft-ietf-ospf-yang-02 and have some questions and doubts.  Pl=
ease let me know your thoughts on the following.


-          There are some concepts that appear to be implementation specifi=
c. For example, should the following be part of the OSPF Yang definition?


o   admin-distance: this is not an OSPF concept that I am familiar with.  A=
dministrative distance is commonly used for comparing the usability of rout=
es originating from different protocols and not associated specifically wit=
h an OSPF instance.


o   nsr: there is no IETF standard for NSR.



o   local-rib: OSPF may be one of a number of routing protocols running on =
a router and therefore the local RIB is not OSPF-specific.



o   container ldp: should this be part of the OSPF Yang?


-          Conversely, should configuration of IGP shortcut support be adde=
d to the Yang definition?


-          There are some options that I would expect to see for the instan=
ce-config that are not present.  Are there any plans to add other options? =
 For example, the following.


o   Configuring the instance as an ASBR.

o   Support for traffic engineering.

o   The ospfRFC1583Compatibility field defined in RFC 4750.


-          The text is OSPFv2-centric in places.  For example:


o   leaf router-id and grouping interface-operation : the description field=
s references RFC 2328.  Should this also refer to RFC 5340 for the OSPFv3 c=
ase?

o   The grouping interface-operation

*  does not include the instance ID

*  dr and bdr leaves have type:ipv4-address.

o   container graceful-restart : description "Enable/Disable graceful resta=
rt as defined in RFC 3623."  (Note that the feature graceful-restart does r=
eference RFC 5187, OSPFv3 Graceful Restart.)

o   container te-rid: refers to IPv4 addresses in several places.


-          The TE (Traffic Engineering) configuration is specified within "=
container mpls".  Is it safe to assume that TE configuration is always mpls=
-related?  It may be better to make it non-specific about the usage of the =
TE information.


-          I found the "container stub-router" confusing.  In particular, t=
he different description fields.  For example, I failed to understand the f=
ollowing.

o   "Specific different triggers to enable stub router." for the choice tri=
gger description

o   "Enables maximum metric for non-stub router link" for the presence.

Regards
Alan Davey



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<p class=3D"MsoNormal">Folks<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">I have read draft-ietf-ospf-yang-02 and have some qu=
estions and doubts.&nbsp; Please let me know your thoughts on the following=
.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt">-<span style=3D=
"font-size:7.0pt;font-family:&quot;Times New Roman&quot;,&quot;serif&quot;"=
>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span>There are some concepts that appear to be implementation specific. F=
or example, should the following be part of the OSPF Yang definition?<o:p><=
/o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.0=
pt"><span style=3D"font-family:&quot;Courier New&quot;">o</span><span style=
=3D"font-size:7.0pt;font-family:&quot;Times New Roman&quot;,&quot;serif&quo=
t;">&nbsp;&nbsp;
</span>admin-distance: this is not an OSPF concept that I am familiar with.=
 &nbsp;Administrative distance is commonly used for comparing the usability=
 of routes originating from different protocols and not associated specific=
ally with an OSPF instance.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.0=
pt"><span style=3D"font-family:&quot;Courier New&quot;">o</span><span style=
=3D"font-size:7.0pt;font-family:&quot;Times New Roman&quot;,&quot;serif&quo=
t;">&nbsp;&nbsp;
</span>nsr: there is no IETF standard for NSR.&nbsp; <o:p></o:p></p>
<p class=3D"MsoListParagraph"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.0=
pt"><span style=3D"font-family:&quot;Courier New&quot;">o</span><span style=
=3D"font-size:7.0pt;font-family:&quot;Times New Roman&quot;,&quot;serif&quo=
t;">&nbsp;&nbsp;
</span>local-rib: OSPF may be one of a number of routing protocols running =
on a router and therefore the local RIB is not OSPF-specific.<o:p></o:p></p=
>
<p class=3D"MsoListParagraph"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.0=
pt"><span style=3D"font-family:&quot;Courier New&quot;">o</span><span style=
=3D"font-size:7.0pt;font-family:&quot;Times New Roman&quot;,&quot;serif&quo=
t;">&nbsp;&nbsp;
</span>container ldp: should this be part of the OSPF Yang?<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo1"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>Conversely, should configuration of IGP shortcut su=
pport be added to the Yang definition?<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt">-<span style=3D=
"font-size:7.0pt;font-family:&quot;Times New Roman&quot;,&quot;serif&quot;"=
>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span>There are some options that I would expect to see for the instance-c=
onfig that are not present.&nbsp; Are there any plans to add other options?=
&nbsp; For example, the following.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.0=
pt"><span style=3D"font-family:&quot;Courier New&quot;">o</span><span style=
=3D"font-size:7.0pt;font-family:&quot;Times New Roman&quot;,&quot;serif&quo=
t;">&nbsp;&nbsp;
</span>Configuring the instance as an ASBR.<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.0=
pt"><span style=3D"font-family:&quot;Courier New&quot;">o</span><span style=
=3D"font-size:7.0pt;font-family:&quot;Times New Roman&quot;,&quot;serif&quo=
t;">&nbsp;&nbsp;
</span>Support for traffic engineering.<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.0=
pt"><span style=3D"font-family:&quot;Courier New&quot;">o</span><span style=
=3D"font-size:7.0pt;font-family:&quot;Times New Roman&quot;,&quot;serif&quo=
t;">&nbsp;&nbsp;
</span>The ospfRFC1583Compatibility field defined in RFC 4750. <o:p></o:p><=
/p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt">-<span style=3D=
"font-size:7.0pt;font-family:&quot;Times New Roman&quot;,&quot;serif&quot;"=
>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span>The text is OSPFv2-centric in places.&nbsp; For example:<o:p></o:p><=
/p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.0=
pt"><span style=3D"font-family:&quot;Courier New&quot;">o</span><span style=
=3D"font-size:7.0pt;font-family:&quot;Times New Roman&quot;,&quot;serif&quo=
t;">&nbsp;&nbsp;
</span>leaf router-id and grouping interface-operation : the description fi=
elds references RFC 2328.&nbsp; Should this also refer to RFC 5340 for the =
OSPFv3 case?<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.0=
pt"><span style=3D"font-family:&quot;Courier New&quot;">o</span><span style=
=3D"font-size:7.0pt;font-family:&quot;Times New Roman&quot;,&quot;serif&quo=
t;">&nbsp;&nbsp;
</span>The grouping interface-operation <o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:108.0pt;text-indent:-18.=
0pt"><span style=3D"font-family:Wingdings">=A7</span><span style=3D"font-si=
ze:7.0pt;font-family:&quot;Times New Roman&quot;,&quot;serif&quot;">&nbsp;
</span>does not include the instance ID<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:108.0pt;text-indent:-18.=
0pt"><span style=3D"font-family:Wingdings">=A7</span><span style=3D"font-si=
ze:7.0pt;font-family:&quot;Times New Roman&quot;,&quot;serif&quot;">&nbsp;
</span>dr and bdr leaves have type:ipv4-address.<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.0=
pt"><span style=3D"font-family:&quot;Courier New&quot;">o</span><span style=
=3D"font-size:7.0pt;font-family:&quot;Times New Roman&quot;,&quot;serif&quo=
t;">&nbsp;&nbsp;
</span>container graceful-restart : description &#8220;Enable/Disable grace=
ful restart as defined in RFC 3623.&#8221;&nbsp; (Note that the feature gra=
ceful-restart does reference RFC 5187, OSPFv3 Graceful Restart.)<o:p></o:p>=
</p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.0=
pt"><span style=3D"font-family:&quot;Courier New&quot;">o</span><span style=
=3D"font-size:7.0pt;font-family:&quot;Times New Roman&quot;,&quot;serif&quo=
t;">&nbsp;&nbsp;
</span>container te-rid: refers to IPv4 addresses in several places.<o:p></=
o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt">-<span style=3D=
"font-size:7.0pt;font-family:&quot;Times New Roman&quot;,&quot;serif&quot;"=
>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span>The TE (Traffic Engineering) configuration is specified within &#822=
0;container mpls&#8221;.&nbsp; Is it safe to assume that TE configuration i=
s always mpls-related?&nbsp; It may be better to make it non-specific about=
 the usage of the TE information.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt">-<span style=3D=
"font-size:7.0pt;font-family:&quot;Times New Roman&quot;,&quot;serif&quot;"=
>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span>I found the &#8220;container stub-router&#8221; confusing.&nbsp; In =
particular, the different description fields.&nbsp; For example, I failed t=
o understand the following.&nbsp;
<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.0=
pt"><span style=3D"font-family:&quot;Courier New&quot;">o</span><span style=
=3D"font-size:7.0pt;font-family:&quot;Times New Roman&quot;,&quot;serif&quo=
t;">&nbsp;&nbsp;
</span>&quot;Specific different triggers to enable stub router.&quot; for t=
he choice trigger description<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.0=
pt"><span style=3D"font-family:&quot;Courier New&quot;">o</span><span style=
=3D"font-size:7.0pt;font-family:&quot;Times New Roman&quot;,&quot;serif&quo=
t;">&nbsp;&nbsp;
</span>&quot;Enables maximum metric for non-stub router link&quot; for the =
presence.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Regards<o:p></o:p></p>
<p class=3D"MsoNormal">Alan Davey<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
</body>
</html>

--_000_C2EE31C852049D499842B19FC01C0804011A65C395ENFICSMBX1dat_--


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From: "Black, David" <david.black@emc.com>
To: Shraddha Hegde <shraddha@juniper.net>, Rob Shakir <rjs@rob.sh>, "as@cisco.com" <as@cisco.com>, "bruno.decraene@orange.com" <bruno.decraene@orange.com>, "ops-dir@ietf.org" <ops-dir@ietf.org>, "General Area Review Team (gen-art@ietf.org)" <gen-art@ietf.org>, "lizhenbin@huawei.com" <lizhenbin@huawei.com>
Thread-Topic: Gen-ART and OPS-Dir review of draft-ietf-ospf-node-admin-tag-06: A-D  issues
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Date: Thu, 8 Oct 2015 17:50:47 +0000
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Cc: "ospf@ietf.org" <ospf@ietf.org>, "Black, David" <david.black@emc.com>, "ietf@ietf.org" <ietf@ietf.org>
Subject: Re: [OSPF] Gen-ART and OPS-Dir review of draft-ietf-ospf-node-admin-tag-06: A-D issues
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From: "Black, David" <david.black@emc.com>
To: "bruno.decraene@orange.com" <bruno.decraene@orange.com>, Shraddha Hegde <shraddha@juniper.net>
Thread-Topic: Gen-ART and OPS-Dir review of draft-ietf-ospf-node-admin-tag-06: [1] Operational Considerations
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Subject: Re: [OSPF] Gen-ART and OPS-Dir review of draft-ietf-ospf-node-admin-tag-06: [1] Operational Considerations
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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Shraddha Hegde <shraddha@juniper.net>, Pushpasis Sarkar <psarkar@juniper.net>
Thread-Topic: OSPF Link Overload  - draft-hegde-ospf-link-overload-01
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Date: Thu, 8 Oct 2015 21:07:09 +0000
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References: <D22B605B.32E55%acee@cisco.com> <BY1PR0501MB1381B0343F37E534E2CFAB8DD54F0@BY1PR0501MB1381.namprd05.prod.outlook.com> <D22EB65C.32FF9%acee@cisco.com> <BY1PR0501MB138107954EB733C69D388CC7D54E0@BY1PR0501MB1381.namprd05.prod.outlook.com> <D22FF12A.3323C%acee@cisco.com> <F41DF673-765D-44B2-9499-E47F3D2EABB7@juniper.net> <D22FFBCB.3325F%acee@cisco.com> <0E0FB058-0DC6-49BD-95BC-6E64584B1DAD@juniper.net> <C4D23725-19FA-4B30-9496-486836E001DA@cisco.com> <03C3AD8C-BA1F-4951-BE7E-367C95535484@juniper.net> <BY1PR0501MB1381D96FA2F88CF374D7E3C8D54E0@BY1PR0501MB1381.namprd05.prod.outlook.com>
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Cc: Hannes Gredler <hannes@gredler.at>, OSPF WG List <ospf@ietf.org>, Mohan Nanduri <mnanduri@microsoft.com>, "Jalil, Luay" <luay.jalil@verizon.com>
Subject: Re: [OSPF] OSPF Link Overload  - draft-hegde-ospf-link-overload-01
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From: "Acee Lindem (acee)" <acee@cisco.com>
To: "Black, David" <david.black@emc.com>, "bruno.decraene@orange.com" <bruno.decraene@orange.com>, Shraddha Hegde <shraddha@juniper.net>
Thread-Topic: Gen-ART and OPS-Dir review of draft-ietf-ospf-node-admin-tag-06: [1] Operational Considerations
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Date: Thu, 8 Oct 2015 21:51:25 +0000
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Cc: "ops-dir@ietf.org" <ops-dir@ietf.org>, "ietf@ietf.org" <ietf@ietf.org>, "General Area Review Team \(gen-art@ietf.org\)" <gen-art@ietf.org>, "ospf@ietf.org" <ospf@ietf.org>, "as@cisco.com" <as@cisco.com>
Subject: Re: [OSPF] Gen-ART and OPS-Dir review of draft-ietf-ospf-node-admin-tag-06: [1] Operational Considerations
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From: "Acee Lindem (acee)" <acee@cisco.com>
To: OSPF WG List <ospf@ietf.org>
Thread-Topic: New Version Notification for draft-ietf-ospf-rfc4970bis-06.txt
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Subject: [OSPF] FW: New Version Notification for draft-ietf-ospf-rfc4970bis-06.txt
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Subject: Re: [OSPF] Gen-ART and OPS-Dir review of draft-ietf-ospf-node-admin-tag-06: [1] Operational Considerations
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From: Shraddha Hegde <shraddha@juniper.net>
To: "Black, David" <david.black@emc.com>, Rob Shakir <rjs@rob.sh>, "as@cisco.com" <as@cisco.com>, "bruno.decraene@orange.com" <bruno.decraene@orange.com>, "ops-dir@ietf.org" <ops-dir@ietf.org>, "General Area Review Team (gen-art@ietf.org)" <gen-art@ietf.org>, "lizhenbin@huawei.com" <lizhenbin@huawei.com>
Thread-Topic: Gen-ART and OPS-Dir review of draft-ietf-ospf-node-admin-tag-06: A-D  issues
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Date: Fri, 9 Oct 2015 03:48:58 +0000
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From: Shraddha Hegde <shraddha@juniper.net>
To: "Acee Lindem (acee)" <acee@cisco.com>, Pushpasis Sarkar <psarkar@juniper.net>
Thread-Topic: OSPF Link Overload  - draft-hegde-ospf-link-overload-01
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Cc: Hannes Gredler <hannes@gredler.at>, OSPF WG List <ospf@ietf.org>, Mohan Nanduri <mnanduri@microsoft.com>, "Jalil, Luay" <luay.jalil@verizon.com>
Subject: Re: [OSPF] OSPF Link Overload  - draft-hegde-ospf-link-overload-01
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From nobody Fri Oct  9 03:18:13 2015
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From: <bruno.decraene@orange.com>
To: "Acee Lindem (acee)" <acee@cisco.com>
Thread-Topic: Advertising Tunnelling Capability in OSPF - draft-xu-ospf-encapsulation-cap-02 WG Document Adoption Poll
Thread-Index: AQHQ+JI/83Xs1nTaFU+1Dc43TlIRpp5jBeCA
Date: Fri, 9 Oct 2015 10:18:06 +0000
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Subject: Re: [OSPF] Advertising Tunnelling Capability in OSPF - draft-xu-ospf-encapsulation-cap-02 WG Document Adoption Poll
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> From: OSPF [mailto:ospf-bounces@ietf.org] On Behalf Of Acee Lindem (acee)=
 > Sent: Saturday, September 26, 2015 9:34 PM
>=20
> This draft was presented in Prague and there was some support of using the
> IGP to disseminate tunnel encapsulation support throughout the OSPF
> routing domain.
>=20
> Please indicate your support (or concerns) for adopting this as a WG
> Document.

Support as co-author.

Regards,
-- Bruno

=20
> Thanks,
> Acee
>=20
> _______________________________________________
> OSPF mailing list
> OSPF@ietf.org
> https://www.ietf.org/mailman/listinfo/ospf

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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Shraddha Hegde <shraddha@juniper.net>, Pushpasis Sarkar <psarkar@juniper.net>
Thread-Topic: OSPF Link Overload  - draft-hegde-ospf-link-overload-01
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Date: Fri, 9 Oct 2015 11:23:47 +0000
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References: <D22B605B.32E55%acee@cisco.com> <BY1PR0501MB1381B0343F37E534E2CFAB8DD54F0@BY1PR0501MB1381.namprd05.prod.outlook.com> <D22EB65C.32FF9%acee@cisco.com> <BY1PR0501MB138107954EB733C69D388CC7D54E0@BY1PR0501MB1381.namprd05.prod.outlook.com> <D22FF12A.3323C%acee@cisco.com> <F41DF673-765D-44B2-9499-E47F3D2EABB7@juniper.net> <D22FFBCB.3325F%acee@cisco.com> <0E0FB058-0DC6-49BD-95BC-6E64584B1DAD@juniper.net> <C4D23725-19FA-4B30-9496-486836E001DA@cisco.com> <03C3AD8C-BA1F-4951-BE7E-367C95535484@juniper.net> <BY1PR0501MB1381D96FA2F88CF374D7E3C8D54E0@BY1PR0501MB1381.namprd05.prod.outlook.com> <D23C52F2.343A2%acee@cisco.com> <CY1PR0501MB1385E5116A1105FB0836D8ABD5340@CY1PR0501MB1385.namprd05.prod.outlook.com>
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Cc: Hannes Gredler <hannes@gredler.at>, OSPF WG List <ospf@ietf.org>, Mohan Nanduri <mnanduri@microsoft.com>, "Jalil, Luay" <luay.jalil@verizon.com>
Subject: Re: [OSPF] OSPF Link Overload  - draft-hegde-ospf-link-overload-01
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From: "Acee Lindem (acee)" <acee@cisco.com>
To: "Keyur Patel (keyupate)" <keyupate@cisco.com>, "Padma Pillay-Esnault (ppe)" <ppe@cisco.com>, "Manish Bhardwaj (manbhard)" <manbhard@cisco.com>, "Serpil Bayraktar (serpil)" <serpil@cisco.com>
Thread-Topic: H-bit Support for OSPFv2 - draft-keyupate-ospf-ospfv2-hbit-01 WG Document Adoption Poll
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Date: Fri, 9 Oct 2015 13:38:26 +0000
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Subject: Re: [OSPF] H-bit Support for OSPFv2 - draft-keyupate-ospf-ospfv2-hbit-01 WG Document Adoption Poll
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To: "Acee Lindem (acee)" <acee@cisco.com>, "Keyur Patel (keyupate)" <keyupate@cisco.com>, "Manish Bhardwaj (manbhard)" <manbhard@cisco.com>, "Serpil Bayraktar (serpil)" <serpil@cisco.com>
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From: Padma Pillay-Esnault <ppe@cisco.com>
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Subject: Re: [OSPF] H-bit Support for OSPFv2 - draft-keyupate-ospf-ospfv2-hbit-01 WG Document Adoption Poll
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Acee

Thanks. Will do

Padma
On 10/9/15 6:38 AM, Acee Lindem (acee) wrote:
> Authors,
> There is support for making this a WG document. Please resubmit this draft
> as draft-ietf-ospf-ospfv2-hbit-00.txt.
> Thanks,
> Acee
>
> On 9/26/15, 3:04 PM, "Acee Lindem (acee)" <acee@cisco.com> wrote:
>
>> This draft was presented in Prague and there was consensus in the room
>> that it was a valid use case. It provides protocol mechanisms to
>> absolutely prevent transit traffic for OSPFv2 Routers (RFC 6987 only
>> discourages transit traffic). The draft also includes assurance of
>> backward compatibility.
>>
>> Please indicate your support (or concerns) for adopting this as a WG
>> Document.
>>
>> Thanks,
>> Acee
>>
>>


From nobody Fri Oct  9 07:49:48 2015
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--001a1137bdd0aa95c70521ad14a7
Content-Type: text/plain; charset=UTF-8

Support as a co-author

Regards,
Luay

On Sat, Sep 26, 2015 at 2:33 PM, Acee Lindem (acee) <acee@cisco.com> wrote:

> This draft was presented in Prague and there was some support of using the
> IGP to disseminate tunnel encapsulation support throughout the OSPF
> routing domain.
>
> Please indicate your support (or concerns) for adopting this as a WG
> Document.
>
> Thanks,
> Acee
>
> _______________________________________________
> OSPF mailing list
> OSPF@ietf.org
> https://www.ietf.org/mailman/listinfo/ospf
>



-- 
*Luay*

--001a1137bdd0aa95c70521ad14a7
Content-Type: text/html; charset=UTF-8
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<div dir=3D"ltr"><span style=3D"font-size:12.8px">Support as a co-author</s=
pan><br><div><span style=3D"font-size:12.8px"><br></span></div><div><span s=
tyle=3D"font-size:12.8px">Regards,</span></div><div><span style=3D"font-siz=
e:12.8px">Luay</span></div></div><div class=3D"gmail_extra"><br><div class=
=3D"gmail_quote">On Sat, Sep 26, 2015 at 2:33 PM, Acee Lindem (acee) <span =
dir=3D"ltr">&lt;<a href=3D"mailto:acee@cisco.com" target=3D"_blank">acee@ci=
sco.com</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" style=3D=
"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">This draft =
was presented in Prague and there was some support of using the<br>
IGP to disseminate tunnel encapsulation support throughout the OSPF<br>
routing domain.<br>
<br>
Please indicate your support (or concerns) for adopting this as a WG<br>
Document.<br>
<br>
Thanks,<br>
Acee<br>
<br>
_______________________________________________<br>
OSPF mailing list<br>
<a href=3D"mailto:OSPF@ietf.org">OSPF@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/ospf" rel=3D"noreferrer" t=
arget=3D"_blank">https://www.ietf.org/mailman/listinfo/ospf</a><br>
</blockquote></div><br><br clear=3D"all"><div><br></div>-- <br><div class=
=3D"gmail_signature"><strong>Luay</strong></div>
</div>

--001a1137bdd0aa95c70521ad14a7--


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From nobody Fri Oct  9 13:44:27 2015
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From: "Black, David" <david.black@emc.com>
To: "shraddha@juniper.net" <shraddha@juniper.net>, "rjs@rob.sh" <rjs@rob.sh>,  "as@cisco.com" <as@cisco.com>, "lizhenbin@huawei.com" <lizhenbin@huawei.com>, "bruno.decraene@orange.com" <bruno.decraene@orange.com>, "General Area Review Team (gen-art@ietf.org)" <gen-art@ietf.org>, "ops-dir@ietf.org" <ops-dir@ietf.org>
Thread-Topic: Gen-ART and OPS-Dir review of draft-ietf-ospf-node-admin-tag-07
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Date: Fri, 9 Oct 2015 20:43:47 +0000
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Cc: "ospf@ietf.org" <ospf@ietf.org>, "Black, David" <david.black@emc.com>, "ietf@ietf.org" <ietf@ietf.org>
Subject: [OSPF] Gen-ART and OPS-Dir review of draft-ietf-ospf-node-admin-tag-07
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The -07 version of this draft addresses all of the issues raised in the
Gen-ART and OPS-Dir review of the -06 version, with the Operational
Considerations section being a particularly welcome addition.  Many
thanks to the authors for the quick turnaround on everything that was
done.

The following is a possible additional security consideration:

Injection of tag values from the outside (e.g., forge OSPF
traffic that appears to be from a node in the domain and carries
administrative tag values) is at least a possible denial-of-service attack
vector, and could also be used for more nefarious purposes (e.g., reroute
otherwise unobservable [to the attacker] VPN traffic via a route where
the attacker can observe it).  Measures should be taken to prevent
injection of outside OSPF traffic in general to protect not only tags,
but all OSPF routing functionality.

Thanks,
--David


> -----Original Message-----
> From: Black, David
> Sent: Monday, October 05, 2015 7:35 PM
> To: shraddha@juniper.net; rjs@rob.sh; as@cisco.com; lizhenbin@huawei.com;
> bruno.decraene@orange.com; General Area Review Team (gen-art@ietf.org); o=
ps-
> dir@ietf.org
> Cc: ietf@ietf.org; ospf@ietf.org; Black, David; acee@cisco.com
> Subject: Gen-ART and OPS-Dir review of draft-ietf-ospf-node-admin-tag-06
>=20
> This is a combined Gen-ART and OPS-Dir review.  Boilerplate for both foll=
ows
> ...
>=20
> I am the assigned Gen-ART reviewer for this draft. For background on
> Gen-ART, please see the FAQ at:
>=20
> <http://wiki.tools.ietf.org/area/gen/trac/wiki/GenArtfaq>.
>=20
> Please resolve these comments along with any other Last Call comments
> you may receive.
>=20
> I have reviewed this document as part of the Operational directorate's on=
going
> effort to review all IETF documents being processed by the IESG.  These
> comments
> were written primarily for the benefit of the operational area directors.
> Document editors and WG chairs should treat these comments just like any =
other
> last call comments.
>=20
> Document: draft-ietf-ospf-node-admin-tag-06
> Reviewer: David Black
> Review Date: October 5, 2015
> IETF LC End Date: October 8, 2015
> IESG Telechat date: October 15, 2015
>=20
> Summary:  This draft is on the right track, but has open issues
>  		described in the review.
>=20
> This is a generally well-written draft about adding administrative tags f=
or
> operational use to OSPF.  The draft is clear, and the material on how the
> tags could be used is helpful, although raises a number of concerns about
> the consequences of the intended usage of these tags.
>=20
> ---- Major issues: ----
>=20
> [1] Operational considerations:  There appears to be more than enough
> enabled by this draft to wreak serious operational havoc, but the draft
> seems to sidestep all operational topics, primarily by treating all
> usage of tags as vendor- or implementation- specific and trusting the
> vendors and operators not to foul things up.  I'm not sure that's wise.
>=20
> See end of OPS-Dir review below for more on this concern.
>=20
> --- Minor issues: ----
>=20
> -- 3.2 Elements of procedure:
>=20
> [A] I see what look like some underspecified requirements:
>=20
>    Each tag SHOULD be treated as an independent identifier that MAY be
>    used in policy to perform a policy action.
>=20
>    The administrative tag list within the
>    TLV SHOULD be considered an unordered list.
>=20
> Why are those two not "MUST" requirements?  What happens if either
> is not done?
>=20
> [B] Tag set completeness:
>=20
>    Multiple node administrative tag TLVs MAY appear in an RI LSA or
>    multiple node administrative tag TLVs MAY be contained in different
>    instances of the RI LSA.  The node administrative tags associated
>    with a node for the purpose of any computation or processing SHOULD
>    be a superset of node administrative tags from all the TLVs in all
>    instances of the RI LSA originated by that node.
>=20
> This paragraph is about processing at that node.  It's easy to misread,
> as that implication is buried in the word "originated" in the last line.
> Suggested change:
>=20
> 	"for the purpose of any computation or processing SHOULD" ->
> 	"for the purpose of any computation or processing performed
> 		at that node SHOULD"
>=20
> Also, it looks like it's acceptable for other nodes to perform such
> computation or processing based on a partial tag set for this node
> (e.g., when some other node has not received all the RI LSAs with all
> the tags).  That should be stated.
>=20
> [C] Tag change/removal:
>=20
>    When there is a change in the node administrative tag TLV or removal/
>    addition of a TLV in any instance of the RI-LSA, implementations MUST
>    take appropriate measures to update its state according to the
>    changed set of tags.  Exact actions depend on features working with
>    administrative tags and is outside of scope of this specification.
>=20
> Inability to interoperably remove a tag value (e.g., distribute the
> update that tag X no longer applies to node Q) seems like a significant
> omission, but I'm not a routing expert, so I'll defer to the WG's and
> ADs' judgment on the importance of this.  At a minimum, the rationale
> for not specifying an interoperable tag value removal mechanism ought
> to be added to this document.
>=20
> [D] No management support
>=20
> From OPS-Dir Q&A: At a minimum, reporting of tag values ought to be
> defined via an OSPF MIB extension or analogous functionality.
>=20
> --- Nits/editorial comments: ----
>=20
> -- 1.  Introduction
>=20
> The Abstract says that the tags are for "route and path selection"; the
> Introduction should also say that.  Suggestion - at the end of this sente=
nce
> in the first paragraph:
>=20
>    It is useful to assign a per-node administrative tag to a router in
>    the OSPF domain and use it as an attribute associated with the node.
>=20
> add the text "for route and path selection".  This will help with the
> second sentence in the second paragraph:
>=20
>    Path selection is a functional set
>    which applies both to TE and non-TE applications and hence new TLV
>    for carrying per-node administrative tags is included in Router
>    Information LSA [RFC4970] .
>=20
> If "path selection" and "functional set" are specific terms with
> specialized meaning in OSPF context, that sentence is fine as-is,
> otherwise it would read better if it began with:
>=20
>    Route and path selection functionality applies to both ...
>=20
> -- 3.1.  TLV format
>=20
>    Type : TBA, Suggested value 10
>=20
> Please add an RFC Editor Note asking the RFC Editor to replace this with
> the actual IANA-assigned value.
>=20
> -- 3.2.  Elements of procedure
>=20
> While it's obvious that tag usage should be confined to the administrativ=
e
> domain that understands the tag, it's worth stating.  At the end of this
> sentence:
>=20
>    Interpretation of tag values is specific to the administrative domain
>    of a particular network operator.
>=20
> I'd suggest adding:
>=20
>    , and hence tag values SHOULD NOT be propagated outside the
>    administrative domain to which they apply.
>=20
> -- 4.4.  Mobile back-haul network service deployment
>=20
> Please expand "eNodeB" acronym on first use.
>=20
> -- 4.5.  Explicit routing policy
>=20
> In Figure 3:
> - The link from the leftmost pair of A nodes to the pair of T nodes
>    do not have link weights.
> - The link from the left R node to the left T node does not have a
>    link weight
> - The following example of an explicitly routed policy:
>=20
>       - Traffic from A nodes to I nodes must not go through R and T
>       	nodes
>=20
>     prevents the leftmost pair of A nodes from sending traffic to the
>     I nodes.  Was this "black hole" intended as part of the example?
>=20
> Also: "explicitly routed policies" -> "explicit routing policies"
>=20
> - 5. Security considerations
>=20
> I'd add discussion that advertisement of tag values for one administrativ=
e
> domain into another risks misinterpretation of the tag values (if the two
> domains have assigned different meanings to the same values), which may
> have undesirable and unanticipated side effects.
>=20
> In addition, injection of tag values from the outside (e.g., forge OSPF
> traffic that appears to be from a node in the domain and carries
> administrative tag values) is at least a possible denial-of-service attac=
k
> vector, and could also be used for more nefarious purposes (e.g., reroute
> otherwise unobservable [to the attacker] VPN traffic via a route where
> the attacker can observe it).
>=20
> idnits 2.13.02 did not find any nits.
>=20
> ---- Selected RFC 5706 Appendix A Q&A for OPS-Dir review ----
>=20
> A.1.2.  Has installation and initial setup been discussed?
> A.1.5.  Has the impact on network operation been discussed?
> A.1.6.  Have suggestions for verifying correct operation been discussed?
>=20
> 	No - given the impact that these tags could have on route and path
> 		computation, likely implementations will be powerful "guns"
> 		with which network operators can readily shoot themselves
> 		in far more than just their "feet."  These
> 		considerations would have to be documented based on the
> 		specific uses made of these tags by specific implementations
> 		and deployments.  All of that appears to be outside the scope
> 		of this draft.
>=20
> A.1.7.  Has management interoperability been discussed?
>=20
> 	No - at a minimum, reporting of tag values ought to be defined
> 		via an OSPF MIB extension or analogous functionality.
> 		This is minor issue [D].
>=20
> A.1.8.  Are there fault or threshold conditions that should be reported?
>=20
> 	Yes, but they're implementation-specific - see response to
> 		A.1.[2,5,6] above.
>=20
> A.2.  Management Considerations
>    Do you anticipate any manageability issues with the specification?
>=20
> 	Yes, manageability has been largely ignored.
>=20
> A.3.  Documentation
>=20
>    Is an operational considerations and/or manageability section part of
>    the document?
>=20
> 	No.
>=20
>    Does the proposed protocol have a significant operational impact on
>    the Internet?
>=20
> 	Yes, the anticipated uses will.
>=20
>    Is there proof of implementation and/or operational experience?
>=20
> 	Nothing was stated in the draft or shepherd write-up.
>=20
> As an OPS-Dir member, I'm concerned by the above RFC 5706 answers,
> and in particular treating all operational issues as vendor- and/or
> operator-specific.  One possible alternative would be to scope the
> draft down to interoperably specify what's needed for LFA, as
> indicated by this answer from the Shepherd write-up:
>=20
> (9) How solid is the WG consensus behind this document? Does it
>     represent the strong concurrence of a few individuals, with others
>     being silent, or does the WG as a whole understand and agree with it?
>=20
>       There is consensus from the WG and others outside the WG that
>       this document can progress. It complements work done on LFA
>       manageability in the RTG Working Group.
>=20
> Another alternative could be Experimental RFC status for the full
> tag mechanism (e.g., to figure out what it'll be used for in practice,
> how and why) rather than Proposed Standard.
>=20
> This is major issue [1].
>=20
> Thanks,
> --David
> ----------------------------------------------------
> David L. Black, Distinguished Engineer
> EMC Corporation, 176 South St., Hopkinton, MA=A0 01748
> +1 (508) 293-7953=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 FAX: +1 (508) 293-7=
786
> david.black@emc.com=A0=A0=A0=A0=A0=A0=A0 Mobile: +1 (978) 394-7754
> ----------------------------------------------------
>=20


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To: "Black, David" <david.black@emc.com>, "rjs@rob.sh" <rjs@rob.sh>, "as@cisco.com" <as@cisco.com>, "lizhenbin@huawei.com" <lizhenbin@huawei.com>,  "bruno.decraene@orange.com" <bruno.decraene@orange.com>, "General Area Review Team (gen-art@ietf.org)" <gen-art@ietf.org>, "ops-dir@ietf.org" <ops-dir@ietf.org>
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Cc: "ospf@ietf.org" <ospf@ietf.org>, "ietf@ietf.org" <ietf@ietf.org>
Subject: Re: [OSPF] Gen-ART and OPS-Dir review of draft-ietf-ospf-node-admin-tag-07
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David,


>Injection of tag values from the outside (e.g., forge OSPF traffic that ap=
pears to be from a node in the domain and carries administrative tag values=
) is >at least a possible denial-of-service attack vector, and could also b=
e used for more nefarious purposes (e.g., reroute otherwise unobservable [t=
o the >attacker] VPN traffic via a route where the attacker can observe it)=
.  Measures should be taken to prevent injection of outside OSPF traffic in=
 general >to protect not only tags, but all OSPF routing functionality.

<Shraddha> The -08 version contains reference to RFC 4593 and RFC 6863 whic=
h discuss in-detail on different security vulnerabilities and OSPF authenti=
cation mechanisms described in RFC 2328,5340 , 7474 and 7166 are sited as s=
olution to the problem.
I think this description would also cover the issue you have brought up. Le=
t me know if you are OK with this.

Rgds
Shraddha


-----Original Message-----
From: Black, David [mailto:david.black@emc.com]=20
Sent: Saturday, October 10, 2015 2:14 AM
To: Shraddha Hegde <shraddha@juniper.net>; rjs@rob.sh; as@cisco.com; lizhen=
bin@huawei.com; bruno.decraene@orange.com; General Area Review Team (gen-ar=
t@ietf.org) <gen-art@ietf.org>; ops-dir@ietf.org
Cc: ietf@ietf.org; ospf@ietf.org; acee@cisco.com; Black, David <david.black=
@emc.com>
Subject: Gen-ART and OPS-Dir review of draft-ietf-ospf-node-admin-tag-07

The -07 version of this draft addresses all of the issues raised in the Gen=
-ART and OPS-Dir review of the -06 version, with the Operational Considerat=
ions section being a particularly welcome addition.  Many thanks to the aut=
hors for the quick turnaround on everything that was done.

The following is a possible additional security consideration:

Injection of tag values from the outside (e.g., forge OSPF traffic that app=
ears to be from a node in the domain and carries administrative tag values)=
 is at least a possible denial-of-service attack vector, and could also be =
used for more nefarious purposes (e.g., reroute otherwise unobservable [to =
the attacker] VPN traffic via a route where the attacker can observe it).  =
Measures should be taken to prevent injection of outside OSPF traffic in ge=
neral to protect not only tags, but all OSPF routing functionality.

Thanks,
--David


> -----Original Message-----
> From: Black, David
> Sent: Monday, October 05, 2015 7:35 PM
> To: shraddha@juniper.net; rjs@rob.sh; as@cisco.com;=20
> lizhenbin@huawei.com; bruno.decraene@orange.com; General Area Review=20
> Team (gen-art@ietf.org); ops- dir@ietf.org
> Cc: ietf@ietf.org; ospf@ietf.org; Black, David; acee@cisco.com
> Subject: Gen-ART and OPS-Dir review of=20
> draft-ietf-ospf-node-admin-tag-06
>=20
> This is a combined Gen-ART and OPS-Dir review.  Boilerplate for both=20
> follows ...
>=20
> I am the assigned Gen-ART reviewer for this draft. For background on=20
> Gen-ART, please see the FAQ at:
>=20
> <http://wiki.tools.ietf.org/area/gen/trac/wiki/GenArtfaq>.
>=20
> Please resolve these comments along with any other Last Call comments=20
> you may receive.
>=20
> I have reviewed this document as part of the Operational directorate's=20
> ongoing effort to review all IETF documents being processed by the=20
> IESG.  These comments were written primarily for the benefit of the=20
> operational area directors.
> Document editors and WG chairs should treat these comments just like=20
> any other last call comments.
>=20
> Document: draft-ietf-ospf-node-admin-tag-06
> Reviewer: David Black
> Review Date: October 5, 2015
> IETF LC End Date: October 8, 2015
> IESG Telechat date: October 15, 2015
>=20
> Summary:  This draft is on the right track, but has open issues
>  		described in the review.
>=20
> This is a generally well-written draft about adding administrative=20
> tags for operational use to OSPF.  The draft is clear, and the=20
> material on how the tags could be used is helpful, although raises a=20
> number of concerns about the consequences of the intended usage of these =
tags.
>=20
> ---- Major issues: ----
>=20
> [1] Operational considerations:  There appears to be more than enough=20
> enabled by this draft to wreak serious operational havoc, but the=20
> draft seems to sidestep all operational topics, primarily by treating=20
> all usage of tags as vendor- or implementation- specific and trusting=20
> the vendors and operators not to foul things up.  I'm not sure that's wis=
e.
>=20
> See end of OPS-Dir review below for more on this concern.
>=20
> --- Minor issues: ----
>=20
> -- 3.2 Elements of procedure:
>=20
> [A] I see what look like some underspecified requirements:
>=20
>    Each tag SHOULD be treated as an independent identifier that MAY be
>    used in policy to perform a policy action.
>=20
>    The administrative tag list within the
>    TLV SHOULD be considered an unordered list.
>=20
> Why are those two not "MUST" requirements?  What happens if either is=20
> not done?
>=20
> [B] Tag set completeness:
>=20
>    Multiple node administrative tag TLVs MAY appear in an RI LSA or
>    multiple node administrative tag TLVs MAY be contained in different
>    instances of the RI LSA.  The node administrative tags associated
>    with a node for the purpose of any computation or processing SHOULD
>    be a superset of node administrative tags from all the TLVs in all
>    instances of the RI LSA originated by that node.
>=20
> This paragraph is about processing at that node.  It's easy to=20
> misread, as that implication is buried in the word "originated" in the la=
st line.
> Suggested change:
>=20
> 	"for the purpose of any computation or processing SHOULD" ->
> 	"for the purpose of any computation or processing performed
> 		at that node SHOULD"
>=20
> Also, it looks like it's acceptable for other nodes to perform such=20
> computation or processing based on a partial tag set for this node=20
> (e.g., when some other node has not received all the RI LSAs with all=20
> the tags).  That should be stated.
>=20
> [C] Tag change/removal:
>=20
>    When there is a change in the node administrative tag TLV or removal/
>    addition of a TLV in any instance of the RI-LSA, implementations MUST
>    take appropriate measures to update its state according to the
>    changed set of tags.  Exact actions depend on features working with
>    administrative tags and is outside of scope of this specification.
>=20
> Inability to interoperably remove a tag value (e.g., distribute the=20
> update that tag X no longer applies to node Q) seems like a=20
> significant omission, but I'm not a routing expert, so I'll defer to=20
> the WG's and ADs' judgment on the importance of this.  At a minimum,=20
> the rationale for not specifying an interoperable tag value removal=20
> mechanism ought to be added to this document.
>=20
> [D] No management support
>=20
> From OPS-Dir Q&A: At a minimum, reporting of tag values ought to be=20
> defined via an OSPF MIB extension or analogous functionality.
>=20
> --- Nits/editorial comments: ----
>=20
> -- 1.  Introduction
>=20
> The Abstract says that the tags are for "route and path selection";=20
> the Introduction should also say that.  Suggestion - at the end of=20
> this sentence in the first paragraph:
>=20
>    It is useful to assign a per-node administrative tag to a router in
>    the OSPF domain and use it as an attribute associated with the node.
>=20
> add the text "for route and path selection".  This will help with the=20
> second sentence in the second paragraph:
>=20
>    Path selection is a functional set
>    which applies both to TE and non-TE applications and hence new TLV
>    for carrying per-node administrative tags is included in Router
>    Information LSA [RFC4970] .
>=20
> If "path selection" and "functional set" are specific terms with=20
> specialized meaning in OSPF context, that sentence is fine as-is,=20
> otherwise it would read better if it began with:
>=20
>    Route and path selection functionality applies to both ...
>=20
> -- 3.1.  TLV format
>=20
>    Type : TBA, Suggested value 10
>=20
> Please add an RFC Editor Note asking the RFC Editor to replace this=20
> with the actual IANA-assigned value.
>=20
> -- 3.2.  Elements of procedure
>=20
> While it's obvious that tag usage should be confined to the=20
> administrative domain that understands the tag, it's worth stating. =20
> At the end of this
> sentence:
>=20
>    Interpretation of tag values is specific to the administrative domain
>    of a particular network operator.
>=20
> I'd suggest adding:
>=20
>    , and hence tag values SHOULD NOT be propagated outside the
>    administrative domain to which they apply.
>=20
> -- 4.4.  Mobile back-haul network service deployment
>=20
> Please expand "eNodeB" acronym on first use.
>=20
> -- 4.5.  Explicit routing policy
>=20
> In Figure 3:
> - The link from the leftmost pair of A nodes to the pair of T nodes
>    do not have link weights.
> - The link from the left R node to the left T node does not have a
>    link weight
> - The following example of an explicitly routed policy:
>=20
>       - Traffic from A nodes to I nodes must not go through R and T
>       	nodes
>=20
>     prevents the leftmost pair of A nodes from sending traffic to the
>     I nodes.  Was this "black hole" intended as part of the example?
>=20
> Also: "explicitly routed policies" -> "explicit routing policies"
>=20
> - 5. Security considerations
>=20
> I'd add discussion that advertisement of tag values for one=20
> administrative domain into another risks misinterpretation of the tag=20
> values (if the two domains have assigned different meanings to the=20
> same values), which may have undesirable and unanticipated side effects.
>=20
> In addition, injection of tag values from the outside (e.g., forge=20
> OSPF traffic that appears to be from a node in the domain and carries=20
> administrative tag values) is at least a possible denial-of-service=20
> attack vector, and could also be used for more nefarious purposes=20
> (e.g., reroute otherwise unobservable [to the attacker] VPN traffic=20
> via a route where the attacker can observe it).
>=20
> idnits 2.13.02 did not find any nits.
>=20
> ---- Selected RFC 5706 Appendix A Q&A for OPS-Dir review ----
>=20
> A.1.2.  Has installation and initial setup been discussed?
> A.1.5.  Has the impact on network operation been discussed?
> A.1.6.  Have suggestions for verifying correct operation been discussed?
>=20
> 	No - given the impact that these tags could have on route and path
> 		computation, likely implementations will be powerful "guns"
> 		with which network operators can readily shoot themselves
> 		in far more than just their "feet."  These
> 		considerations would have to be documented based on the
> 		specific uses made of these tags by specific implementations
> 		and deployments.  All of that appears to be outside the scope
> 		of this draft.
>=20
> A.1.7.  Has management interoperability been discussed?
>=20
> 	No - at a minimum, reporting of tag values ought to be defined
> 		via an OSPF MIB extension or analogous functionality.
> 		This is minor issue [D].
>=20
> A.1.8.  Are there fault or threshold conditions that should be reported?
>=20
> 	Yes, but they're implementation-specific - see response to
> 		A.1.[2,5,6] above.
>=20
> A.2.  Management Considerations
>    Do you anticipate any manageability issues with the specification?
>=20
> 	Yes, manageability has been largely ignored.
>=20
> A.3.  Documentation
>=20
>    Is an operational considerations and/or manageability section part of
>    the document?
>=20
> 	No.
>=20
>    Does the proposed protocol have a significant operational impact on
>    the Internet?
>=20
> 	Yes, the anticipated uses will.
>=20
>    Is there proof of implementation and/or operational experience?
>=20
> 	Nothing was stated in the draft or shepherd write-up.
>=20
> As an OPS-Dir member, I'm concerned by the above RFC 5706 answers, and=20
> in particular treating all operational issues as vendor- and/or=20
> operator-specific.  One possible alternative would be to scope the=20
> draft down to interoperably specify what's needed for LFA, as=20
> indicated by this answer from the Shepherd write-up:
>=20
> (9) How solid is the WG consensus behind this document? Does it
>     represent the strong concurrence of a few individuals, with others
>     being silent, or does the WG as a whole understand and agree with it?
>=20
>       There is consensus from the WG and others outside the WG that
>       this document can progress. It complements work done on LFA
>       manageability in the RTG Working Group.
>=20
> Another alternative could be Experimental RFC status for the full tag=20
> mechanism (e.g., to figure out what it'll be used for in practice, how=20
> and why) rather than Proposed Standard.
>=20
> This is major issue [1].
>=20
> Thanks,
> --David
> ----------------------------------------------------
> David L. Black, Distinguished Engineer EMC Corporation, 176 South St.,=20
> Hopkinton, MA=A0 01748
> +1 (508) 293-7953=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 FAX: +1 (508) 293-7=
786
> david.black@emc.com=A0=A0=A0=A0=A0=A0=A0 Mobile: +1 (978) 394-7754
> ----------------------------------------------------
>=20


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--_002_BY1PR0501MB1381C9C4AE5057EF4C38BAEBD5320BY1PR0501MB1381_--


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From: "Black, David" <david.black@emc.com>
To: Shraddha Hegde <shraddha@juniper.net>, "rjs@rob.sh" <rjs@rob.sh>, "as@cisco.com" <as@cisco.com>, "lizhenbin@huawei.com" <lizhenbin@huawei.com>, "bruno.decraene@orange.com" <bruno.decraene@orange.com>, "General Area Review Team (gen-art@ietf.org)" <gen-art@ietf.org>, "ops-dir@ietf.org" <ops-dir@ietf.org>
Thread-Topic: Gen-ART and OPS-Dir review of draft-ietf-ospf-node-admin-tag-07
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Subject: Re: [OSPF] Gen-ART and OPS-Dir review of draft-ietf-ospf-node-admin-tag-07
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> I think this description would also cover the issue you have brought up. =
Let
> me know if you are OK with this.

Yes, I'm OK - that covers the topic.

Thanks, --David

> -----Original Message-----
> From: Shraddha Hegde [mailto:shraddha@juniper.net]
> Sent: Sunday, October 11, 2015 9:08 AM
> To: Black, David; rjs@rob.sh; as@cisco.com; lizhenbin@huawei.com;
> bruno.decraene@orange.com; General Area Review Team (gen-art@ietf.org); o=
ps-
> dir@ietf.org
> Cc: ietf@ietf.org; ospf@ietf.org; acee@cisco.com
> Subject: RE: Gen-ART and OPS-Dir review of draft-ietf-ospf-node-admin-tag=
-07
>=20
> David,
>=20
>=20
> >Injection of tag values from the outside (e.g., forge OSPF traffic that
> appears to be from a node in the domain and carries administrative tag va=
lues)
> is >at least a possible denial-of-service attack vector, and could also b=
e
> used for more nefarious purposes (e.g., reroute otherwise unobservable [t=
o the
> >attacker] VPN traffic via a route where the attacker can observe it).
> Measures should be taken to prevent injection of outside OSPF traffic in
> general >to protect not only tags, but all OSPF routing functionality.
>=20
> <Shraddha> The -08 version contains reference to RFC 4593 and RFC 6863 wh=
ich
> discuss in-detail on different security vulnerabilities and OSPF
> authentication mechanisms described in RFC 2328,5340 , 7474 and 7166 are =
sited
> as solution to the problem.
> I think this description would also cover the issue you have brought up. =
Let
> me know if you are OK with this.
>=20
> Rgds
> Shraddha
>=20
>=20
> -----Original Message-----
> From: Black, David [mailto:david.black@emc.com]
> Sent: Saturday, October 10, 2015 2:14 AM
> To: Shraddha Hegde <shraddha@juniper.net>; rjs@rob.sh; as@cisco.com;
> lizhenbin@huawei.com; bruno.decraene@orange.com; General Area Review Team
> (gen-art@ietf.org) <gen-art@ietf.org>; ops-dir@ietf.org
> Cc: ietf@ietf.org; ospf@ietf.org; acee@cisco.com; Black, David
> <david.black@emc.com>
> Subject: Gen-ART and OPS-Dir review of draft-ietf-ospf-node-admin-tag-07
>=20
> The -07 version of this draft addresses all of the issues raised in the G=
en-
> ART and OPS-Dir review of the -06 version, with the Operational Considera=
tions
> section being a particularly welcome addition.  Many thanks to the author=
s for
> the quick turnaround on everything that was done.
>=20
> The following is a possible additional security consideration:
>=20
> Injection of tag values from the outside (e.g., forge OSPF traffic that
> appears to be from a node in the domain and carries administrative tag va=
lues)
> is at least a possible denial-of-service attack vector, and could also be=
 used
> for more nefarious purposes (e.g., reroute otherwise unobservable [to the
> attacker] VPN traffic via a route where the attacker can observe it).
> Measures should be taken to prevent injection of outside OSPF traffic in
> general to protect not only tags, but all OSPF routing functionality.
>=20
> Thanks,
> --David
>=20
>=20
> > -----Original Message-----
> > From: Black, David
> > Sent: Monday, October 05, 2015 7:35 PM
> > To: shraddha@juniper.net; rjs@rob.sh; as@cisco.com;
> > lizhenbin@huawei.com; bruno.decraene@orange.com; General Area Review
> > Team (gen-art@ietf.org); ops- dir@ietf.org
> > Cc: ietf@ietf.org; ospf@ietf.org; Black, David; acee@cisco.com
> > Subject: Gen-ART and OPS-Dir review of
> > draft-ietf-ospf-node-admin-tag-06
> >
> > This is a combined Gen-ART and OPS-Dir review.  Boilerplate for both
> > follows ...
> >
> > I am the assigned Gen-ART reviewer for this draft. For background on
> > Gen-ART, please see the FAQ at:
> >
> > <http://wiki.tools.ietf.org/area/gen/trac/wiki/GenArtfaq>.
> >
> > Please resolve these comments along with any other Last Call comments
> > you may receive.
> >
> > I have reviewed this document as part of the Operational directorate's
> > ongoing effort to review all IETF documents being processed by the
> > IESG.  These comments were written primarily for the benefit of the
> > operational area directors.
> > Document editors and WG chairs should treat these comments just like
> > any other last call comments.
> >
> > Document: draft-ietf-ospf-node-admin-tag-06
> > Reviewer: David Black
> > Review Date: October 5, 2015
> > IETF LC End Date: October 8, 2015
> > IESG Telechat date: October 15, 2015
> >
> > Summary:  This draft is on the right track, but has open issues
> >  		described in the review.
> >
> > This is a generally well-written draft about adding administrative
> > tags for operational use to OSPF.  The draft is clear, and the
> > material on how the tags could be used is helpful, although raises a
> > number of concerns about the consequences of the intended usage of thes=
e
> tags.
> >
> > ---- Major issues: ----
> >
> > [1] Operational considerations:  There appears to be more than enough
> > enabled by this draft to wreak serious operational havoc, but the
> > draft seems to sidestep all operational topics, primarily by treating
> > all usage of tags as vendor- or implementation- specific and trusting
> > the vendors and operators not to foul things up.  I'm not sure that's w=
ise.
> >
> > See end of OPS-Dir review below for more on this concern.
> >
> > --- Minor issues: ----
> >
> > -- 3.2 Elements of procedure:
> >
> > [A] I see what look like some underspecified requirements:
> >
> >    Each tag SHOULD be treated as an independent identifier that MAY be
> >    used in policy to perform a policy action.
> >
> >    The administrative tag list within the
> >    TLV SHOULD be considered an unordered list.
> >
> > Why are those two not "MUST" requirements?  What happens if either is
> > not done?
> >
> > [B] Tag set completeness:
> >
> >    Multiple node administrative tag TLVs MAY appear in an RI LSA or
> >    multiple node administrative tag TLVs MAY be contained in different
> >    instances of the RI LSA.  The node administrative tags associated
> >    with a node for the purpose of any computation or processing SHOULD
> >    be a superset of node administrative tags from all the TLVs in all
> >    instances of the RI LSA originated by that node.
> >
> > This paragraph is about processing at that node.  It's easy to
> > misread, as that implication is buried in the word "originated" in the =
last
> line.
> > Suggested change:
> >
> > 	"for the purpose of any computation or processing SHOULD" ->
> > 	"for the purpose of any computation or processing performed
> > 		at that node SHOULD"
> >
> > Also, it looks like it's acceptable for other nodes to perform such
> > computation or processing based on a partial tag set for this node
> > (e.g., when some other node has not received all the RI LSAs with all
> > the tags).  That should be stated.
> >
> > [C] Tag change/removal:
> >
> >    When there is a change in the node administrative tag TLV or removal=
/
> >    addition of a TLV in any instance of the RI-LSA, implementations MUS=
T
> >    take appropriate measures to update its state according to the
> >    changed set of tags.  Exact actions depend on features working with
> >    administrative tags and is outside of scope of this specification.
> >
> > Inability to interoperably remove a tag value (e.g., distribute the
> > update that tag X no longer applies to node Q) seems like a
> > significant omission, but I'm not a routing expert, so I'll defer to
> > the WG's and ADs' judgment on the importance of this.  At a minimum,
> > the rationale for not specifying an interoperable tag value removal
> > mechanism ought to be added to this document.
> >
> > [D] No management support
> >
> > From OPS-Dir Q&A: At a minimum, reporting of tag values ought to be
> > defined via an OSPF MIB extension or analogous functionality.
> >
> > --- Nits/editorial comments: ----
> >
> > -- 1.  Introduction
> >
> > The Abstract says that the tags are for "route and path selection";
> > the Introduction should also say that.  Suggestion - at the end of
> > this sentence in the first paragraph:
> >
> >    It is useful to assign a per-node administrative tag to a router in
> >    the OSPF domain and use it as an attribute associated with the node.
> >
> > add the text "for route and path selection".  This will help with the
> > second sentence in the second paragraph:
> >
> >    Path selection is a functional set
> >    which applies both to TE and non-TE applications and hence new TLV
> >    for carrying per-node administrative tags is included in Router
> >    Information LSA [RFC4970] .
> >
> > If "path selection" and "functional set" are specific terms with
> > specialized meaning in OSPF context, that sentence is fine as-is,
> > otherwise it would read better if it began with:
> >
> >    Route and path selection functionality applies to both ...
> >
> > -- 3.1.  TLV format
> >
> >    Type : TBA, Suggested value 10
> >
> > Please add an RFC Editor Note asking the RFC Editor to replace this
> > with the actual IANA-assigned value.
> >
> > -- 3.2.  Elements of procedure
> >
> > While it's obvious that tag usage should be confined to the
> > administrative domain that understands the tag, it's worth stating.
> > At the end of this
> > sentence:
> >
> >    Interpretation of tag values is specific to the administrative domai=
n
> >    of a particular network operator.
> >
> > I'd suggest adding:
> >
> >    , and hence tag values SHOULD NOT be propagated outside the
> >    administrative domain to which they apply.
> >
> > -- 4.4.  Mobile back-haul network service deployment
> >
> > Please expand "eNodeB" acronym on first use.
> >
> > -- 4.5.  Explicit routing policy
> >
> > In Figure 3:
> > - The link from the leftmost pair of A nodes to the pair of T nodes
> >    do not have link weights.
> > - The link from the left R node to the left T node does not have a
> >    link weight
> > - The following example of an explicitly routed policy:
> >
> >       - Traffic from A nodes to I nodes must not go through R and T
> >       	nodes
> >
> >     prevents the leftmost pair of A nodes from sending traffic to the
> >     I nodes.  Was this "black hole" intended as part of the example?
> >
> > Also: "explicitly routed policies" -> "explicit routing policies"
> >
> > - 5. Security considerations
> >
> > I'd add discussion that advertisement of tag values for one
> > administrative domain into another risks misinterpretation of the tag
> > values (if the two domains have assigned different meanings to the
> > same values), which may have undesirable and unanticipated side effects=
.
> >
> > In addition, injection of tag values from the outside (e.g., forge
> > OSPF traffic that appears to be from a node in the domain and carries
> > administrative tag values) is at least a possible denial-of-service
> > attack vector, and could also be used for more nefarious purposes
> > (e.g., reroute otherwise unobservable [to the attacker] VPN traffic
> > via a route where the attacker can observe it).
> >
> > idnits 2.13.02 did not find any nits.
> >
> > ---- Selected RFC 5706 Appendix A Q&A for OPS-Dir review ----
> >
> > A.1.2.  Has installation and initial setup been discussed?
> > A.1.5.  Has the impact on network operation been discussed?
> > A.1.6.  Have suggestions for verifying correct operation been discussed=
?
> >
> > 	No - given the impact that these tags could have on route and path
> > 		computation, likely implementations will be powerful "guns"
> > 		with which network operators can readily shoot themselves
> > 		in far more than just their "feet."  These
> > 		considerations would have to be documented based on the
> > 		specific uses made of these tags by specific implementations
> > 		and deployments.  All of that appears to be outside the scope
> > 		of this draft.
> >
> > A.1.7.  Has management interoperability been discussed?
> >
> > 	No - at a minimum, reporting of tag values ought to be defined
> > 		via an OSPF MIB extension or analogous functionality.
> > 		This is minor issue [D].
> >
> > A.1.8.  Are there fault or threshold conditions that should be reported=
?
> >
> > 	Yes, but they're implementation-specific - see response to
> > 		A.1.[2,5,6] above.
> >
> > A.2.  Management Considerations
> >    Do you anticipate any manageability issues with the specification?
> >
> > 	Yes, manageability has been largely ignored.
> >
> > A.3.  Documentation
> >
> >    Is an operational considerations and/or manageability section part o=
f
> >    the document?
> >
> > 	No.
> >
> >    Does the proposed protocol have a significant operational impact on
> >    the Internet?
> >
> > 	Yes, the anticipated uses will.
> >
> >    Is there proof of implementation and/or operational experience?
> >
> > 	Nothing was stated in the draft or shepherd write-up.
> >
> > As an OPS-Dir member, I'm concerned by the above RFC 5706 answers, and
> > in particular treating all operational issues as vendor- and/or
> > operator-specific.  One possible alternative would be to scope the
> > draft down to interoperably specify what's needed for LFA, as
> > indicated by this answer from the Shepherd write-up:
> >
> > (9) How solid is the WG consensus behind this document? Does it
> >     represent the strong concurrence of a few individuals, with others
> >     being silent, or does the WG as a whole understand and agree with i=
t?
> >
> >       There is consensus from the WG and others outside the WG that
> >       this document can progress. It complements work done on LFA
> >       manageability in the RTG Working Group.
> >
> > Another alternative could be Experimental RFC status for the full tag
> > mechanism (e.g., to figure out what it'll be used for in practice, how
> > and why) rather than Proposed Standard.
> >
> > This is major issue [1].
> >
> > Thanks,
> > --David
> > ----------------------------------------------------
> > David L. Black, Distinguished Engineer EMC Corporation, 176 South St.,
> > Hopkinton, MA=A0 01748
> > +1 (508) 293-7953=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 FAX: +1 (508) 293=
-7786
> > david.black@emc.com=A0=A0=A0=A0=A0=A0=A0 Mobile: +1 (978) 394-7754
> > ----------------------------------------------------
> >


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From nobody Sun Oct 11 21:12:17 2015
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From: Anil Kumar <anil.ietf@gmail.com>
Date: Mon, 12 Oct 2015 04:12:04 +0000
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To: Lizhenbin <lizhenbin@huawei.com>, "Acee Lindem (acee)" <acee@cisco.com>, OSPF WG List <ospf@ietf.org>
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--047d7b86df7abd0d470521e088b0
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I support.

On Mon, Oct 12, 2015, 9:04 AM Lizhenbin <lizhenbin@huawei.com> wrote:

> Owing to different application scenarios, there needs to be multiple
> protocols choice to advertising tunneling capability.
> IGP extension work in the field is import. I support the document to be
> adopted as the WG document.
>
> Best Regards,
> Zhenbin(Robin)
>
>
> -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----
> =E5=8F=91=E4=BB=B6=E4=BA=BA: Acee Lindem (acee) [mailto:acee@cisco.com]
> =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2015=E5=B9=B49=E6=9C=8827=E6=97=A5 =
3:34
> =E6=94=B6=E4=BB=B6=E4=BA=BA: OSPF WG List
> =E4=B8=BB=E9=A2=98: [OSPF] Advertising Tunnelling Capability in OSPF -
> draft-xu-ospf-encapsulation-cap-02 WG Document Adoption Poll
>
> This draft was presented in Prague and there was some support of using th=
e
> IGP to disseminate tunnel encapsulation support throughout the OSPF routi=
ng
> domain.
>
> Please indicate your support (or concerns) for adopting this as a WG
> Document.
>
> Thanks,
> Acee
>
> _______________________________________________
> OSPF mailing list
> OSPF@ietf.org
> https://www.ietf.org/mailman/listinfo/ospf
> _______________________________________________
> OSPF mailing list
> OSPF@ietf.org
> https://www.ietf.org/mailman/listinfo/ospf
>

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<p dir=3D"ltr">I support.</p>
<br><div class=3D"gmail_quote"><div dir=3D"ltr">On Mon, Oct 12, 2015, 9:04 =
AM=C2=A0Lizhenbin &lt;<a href=3D"mailto:lizhenbin@huawei.com">lizhenbin@hua=
wei.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"=
margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Owing to dif=
ferent application scenarios, there needs to be multiple protocols choice t=
o advertising tunneling capability.<br>
IGP extension work in the field is import. I support the document to be ado=
pted as the WG document.<br>
<br>
Best Regards,<br>
Zhenbin(Robin)<br>
<br>
<br>
-----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----<br>
=E5=8F=91=E4=BB=B6=E4=BA=BA: Acee Lindem (acee) [mailto:<a href=3D"mailto:a=
cee@cisco.com" target=3D"_blank">acee@cisco.com</a>]<br>
=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2015=E5=B9=B49=E6=9C=8827=E6=97=A5 3:=
34<br>
=E6=94=B6=E4=BB=B6=E4=BA=BA: OSPF WG List<br>
=E4=B8=BB=E9=A2=98: [OSPF] Advertising Tunnelling Capability in OSPF - draf=
t-xu-ospf-encapsulation-cap-02 WG Document Adoption Poll<br>
<br>
This draft was presented in Prague and there was some support of using the =
IGP to disseminate tunnel encapsulation support throughout the OSPF routing=
 domain.<br>
<br>
Please indicate your support (or concerns) for adopting this as a WG Docume=
nt.<br>
<br>
Thanks,<br>
Acee<br>
<br>
_______________________________________________<br>
OSPF mailing list<br>
<a href=3D"mailto:OSPF@ietf.org" target=3D"_blank">OSPF@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/ospf" rel=3D"noreferrer" t=
arget=3D"_blank">https://www.ietf.org/mailman/listinfo/ospf</a><br>
_______________________________________________<br>
OSPF mailing list<br>
<a href=3D"mailto:OSPF@ietf.org" target=3D"_blank">OSPF@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/ospf" rel=3D"noreferrer" t=
arget=3D"_blank">https://www.ietf.org/mailman/listinfo/ospf</a><br>
</blockquote></div>

--047d7b86df7abd0d470521e088b0--


From nobody Mon Oct 12 06:34:27 2015
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From: "Benoit Claise" <bclaise@cisco.com>
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Subject: [OSPF] Benoit Claise's No Objection on draft-ietf-ospf-node-admin-tag-07: (with COMMENT)
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Benoit Claise has entered the following ballot position for
draft-ietf-ospf-node-admin-tag-07: No Objection

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The document, along with other ballot positions, can be found here:
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----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

- "Tags carried by the
   administrative tag TLV SHOULD be used to indicate independent
   characteristics of a node."

I was initially confused by that sentence.
So there are tags carried by a different TLV than the administrative one?
Actually, no (I checked with one of the authors).
I would simply write:
   "Administrative tag TLV SHOULD be used to indicate independent
   characteristics of a node."

This would be in line with the definition:
   An administrative Tag is a 32-bit integer value that can be used to
   identify a group of nodes in the OSPF domain.

- Router information LSA [RFC4970] can have link, area or AS
   level flooding scope.  Choosing the flooding scope to flood the group
   tags are defined by the policies and is a local matter.

"and is a local matter". Hopefully there is some sort of centralized
management application that checks consistency.



From nobody Mon Oct 12 06:39:25 2015
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Subject: Re: [OSPF] Benoit Claise's No Objection on draft-ietf-ospf-node-admin-tag-07: (with COMMENT)
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From: Shraddha Hegde <shraddha@juniper.net>
To: "Black, David" <david.black@emc.com>, Benoit Claise <bclaise@cisco.com>, The IESG <iesg@ietf.org>
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Subject: Re: [OSPF] Benoit Claise's No Objection on draft-ietf-ospf-node-admin-tag-07: (with COMMENT)
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From: Shraddha Hegde <shraddha@juniper.net>
To: "Acee Lindem (acee)" <acee@cisco.com>, "draft-ietf-ospf-two-part-metric@ietf.org" <draft-ietf-ospf-two-part-metric@ietf.org>
Thread-Topic: draft-ietf-ospf-two-part-metric : Max metric handling
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Date: Tue, 13 Oct 2015 04:30:52 +0000
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Subject: Re: [OSPF] draft-ietf-ospf-two-part-metric : Max metric handling
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From: "Acee Lindem (acee)" <acee@cisco.com>
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Thread-Topic: Advertising Tunnelling Capability in OSPF - draft-xu-ospf-encapsulation-cap-02 WG Document Adoption Poll
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From nobody Tue Oct 13 07:21:31 2015
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Alvaro Retana has entered the following ballot position for
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----------------------------------------------------------------------
DISCUSS:
----------------------------------------------------------------------

Section 3.2. (Elements of procedure) says that the "interpretation of tag
values is specific to the administrative domain of a particular network
operator", which makes them opaque and obviously locally significant.  I
then have an issue with the following text, which tries to (using rfc2119
keywords) specify how to interpret the tags, which doesn't make sense to
me given the text above:

   Each tag MUST be treated as an independent identifier that MAY be
   used in policy to perform a policy action.  Tags carried by the
   administrative tag TLV SHOULD be used to indicate independent
   characteristics of a node.  The administrative tag list within the
   TLV MUST be considered an unordered list.  Whilst policies may be
   implemented based on the presence of multiple tags (e.g., if tag A
   AND tag B are present), they MUST NOT be reliant upon the order of
   the tags (i.e., all policies should be considered commutative
   operations, such that tag A preceding or following tag B does not
   change their outcome).

   To avoid incomplete or inconsistent interpretations of the per-node
   administrative tags the same tag value MUST NOT be advertised by a
   router in RI LSAs of different scopes.  The same tag MAY be
   advertised in multiple RI LSAs of the same scope, for example, OSPF
   Area Border Router (ABR) may advertise the same tag in area-scope RI
   LSAs in multiple areas connected to the ABR.
. . .
   Being part of the RI LSA, the per-node administrative tag TLV must be
   reasonably small and stable.  In particular, but not limited to,
   implementations supporting the per-node administrative tags MUST NOT
   tie advertised tags to changes in the network topology (both within
   and outside the OSPF domain) or reachability of routes.
. . .
   instances of the RI LSA.  The node administrative tags associated
   with a node that originates tags for the purpose of any computation
   or processing at a receiving node SHOULD be a superset of node
   administrative tags from all the TLVs in all the received RI LSA
   instances originated by that node.When an RI LSA is received that
   changes the set of tags applicable to any originating node, a
   receiving node MUST repeat any computation or processing that is
   based on those administrative tags.

If the tags are opaque, I don't think that anything can be mandated as to
how they are interpreted or what they're used for.  That is the point I
want to talk about with this DISCUSS.


----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

Related to the DISCUSS:  Section 3.2 says that the "meaning of the Node
administrative tags is generally opaque to OSPF", are there cases where
the meaning is not opaque?  Even if the application is well known there
is no indication that the tag is not opaque.  Yes, this is a nit with the
word "generally".

All the references related to rfc4970 should be changed to
draft-ietf-ospf-rfc4970bis.



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From nobody Wed Oct 14 08:50:22 2015
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Barry Leiba has entered the following ballot position for
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----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

The abstract reads a bit oddly, repeating "This document describes an
extension to OSPF protocol".  Perhaps while you're making changes to
address the other IESG comments, you could re-word the abstract to avoid
that repetition.



From nobody Wed Oct 14 10:16:54 2015
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----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

I share Alvero's Discuss about whether these tags are opaque.



From nobody Wed Oct 14 14:12:08 2015
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From: "Acee Lindem (acee)" <acee@cisco.com>
To: "draft-ietf-ospf-node-admin-tag@ietf.org" <draft-ietf-ospf-node-admin-tag@ietf.org>
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From nobody Wed Oct 14 17:12:55 2015
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Date: Thu, 15 Oct 2015 01:12:44 +0100
From: Rob Shakir <rjs@rob.sh>
To: "Acee Lindem (acee)" <acee@cisco.com>,  "=?utf-8?Q?draft-ietf-ospf-node-admin-tag=40ietf.org?=" <draft-ietf-ospf-node-admin-tag@ietf.org>
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Hi Acee,

On 14 October 2015 at 22:16:37, Acee Lindem (acee) (acee@cisco.com) wrote:
> Authors,
> 
> Please indicate whether you are aware of any relevant IPR and if so,
> whether it has been disclosed.
> 
> This IPR has been disclosed: http://datatracker.ietf.org/ipr/2460/

The disclosed IPR is the only IPR that I am aware of.

Best,
r.


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From: Shraddha Hegde <shraddha@juniper.net>
To: Alvaro Retana <aretana@cisco.com>, The IESG <iesg@ietf.org>
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From: <bruno.decraene@orange.com>
To: "Acee Lindem (acee)" <acee@cisco.com>
Thread-Topic: draft-ietf-ospf-node-admin-tag - Advertising per-node administrative tags in OSPF
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Date: Thu, 15 Oct 2015 07:00:13 +0000
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Subject: Re: [OSPF] draft-ietf-ospf-node-admin-tag - Advertising per-node administrative tags in OSPF
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Date: Thu, 15 Oct 2015 11:21:49 +0200
From: Anton Smirnov <asmirnov@cisco.com>
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Subject: Re: [OSPF] draft-ietf-ospf-node-admin-tag - Advertising per-node administrative tags in OSPF
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    Hello,
    I am not aware of any IPR related to this draft.

Anton


On 10/14/2015 11:16 PM, Acee Lindem (acee) wrote:
> Authors,
>
> Please indicate whether you are aware of any relevant IPR and if so,
> whether it has been disclosed.
>
> This IPR has been disclosed: http://datatracker.ietf.org/ipr/2460/
>
> Thanks,
> Acee
>


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Subject: Re: [OSPF] Alvaro Retana's Discuss on draft-ietf-ospf-node-admin-tag-07: (with DISCUSS and COMMENT)
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    Hi Alvaro, Shraddha,

 > Related to the DISCUSS:  Section 3.2 says that the "meaning of the
 > Node administrative tags is generally opaque to OSPF", are there
 > cases where the meaning is not opaque?  Even if the application is 
well known there is no indication that the tag is not opaque.  Yes,
 > this is a nit with the word "generally".
 > <Shraddha> There are no known cases where OSPF needs to look into the
 > tags but I do not rule out the possibility in future where OSPF uses
 > tags for some of its functionality

    Tags may or may not be opaque to OSPF. This depends both on the use 
case and device implementation & configuration.
    If we consider use case of MPLS TE placement from the document then 
tags are opaque to OSPF (both for originators and routers running 
computation). MPLS TE is the consumer.
    OTOH if we consider rLFA use case then tags are opaque for routers 
originating them but they are NOT opaque to OSPF on routers running rLFA 
computation. In this case OSPF is configured with policy to check tags 
advertised by a node considered as candidate rLFA terminating point and 
accept or reject candidate based on tags advertised by that node and 
local policy.
    So IMO there do exist use cases where OSPF is consumer of tags and 
at least couple of example use cases in the document fall into this 
category.

    Note that above I assume rLFA functionality to be part of OSPF. One 
may lay argument that rLFA is not an OSPF but is as external to OSPF as 
MPLS TE.
    To cover possible use cases and differences in implementations I 
prefer we do not assume that users of tags are always outside of OSPF.

Anton


On 10/15/2015 06:47 AM, Shraddha Hegde wrote:
> Alvaro,
>
> Thanks for reviewing the document.
> As indicated in other thread, we need rules/regulation on how to interpret the tags and how to use them to get interoperable implementations.
>
>> Although , the actual values of node admin tags do not need to be standardized and is left to the operator's discretion to allocate values and assign meanings to it, It's necessary to layout certain rules/regulations and guidelines on how the tags can be used and how
> they cannot be used. That will help in getting interoperable implementations from vendors and avoid surprises in the field.
> For ex:  We have a statement administrative tag order has no meaning. If this document does not specify such a statement, there I every possibility some implementation will have policies that will look at the order in which the tags are encoded. Some other implementation which does not care about the order of the tag might keep changing it at every LSA refresh so it's hard to get them to interoperate.
>
> Added below text in section 3.2.1
> " This section describes general rules/ regulations
> and guidelines for using and interpreting an administrative tag which will
>   facilitate interoperable implementations by vendors."
>
>
>
> Related to the DISCUSS:  Section 3.2 says that the "meaning of the Node administrative tags is generally opaque to OSPF", are there cases where the meaning is not opaque?  Even if the application is well known there is no indication that the tag is not opaque.  Yes, this is a nit with the word "generally".
> <Shraddha> There are no known cases where OSPF needs to look into the tags but I do not rule out the possibility in future where OSPF uses tags for some of its functionality
>
> All the references related to rfc4970 should be changed to draft-ietf-ospf-rfc4970bis.
> <Shraddha> Is it OK to reference drafts as Normative refrence?
>
> Rgds
> Shraddha
>
> -----Original Message-----
> From: Alvaro Retana [mailto:aretana@cisco.com]
> Sent: Tuesday, October 13, 2015 7:51 PM
> To: The IESG <iesg@ietf.org>
> Cc: acee@cisco.com; draft-ietf-ospf-node-admin-tag.ad@ietf.org; draft-ietf-ospf-node-admin-tag.shepherd@ietf.org; draft-ietf-ospf-node-admin-tag@ietf.org; ospf-chairs@ietf.org; ospf@ietf.org
> Subject: Alvaro Retana's Discuss on draft-ietf-ospf-node-admin-tag-07: (with DISCUSS and COMMENT)
>
> Alvaro Retana has entered the following ballot position for
> draft-ietf-ospf-node-admin-tag-07: Discuss
>
> When responding, please keep the subject line intact and reply to all email addresses included in the To and CC lines. (Feel free to cut this introductory paragraph, however.)
>
>
> Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html
> for more information about IESG DISCUSS and COMMENT positions.
>
>
> The document, along with other ballot positions, can be found here:
> https://datatracker.ietf.org/doc/draft-ietf-ospf-node-admin-tag/
>
>
>
> ----------------------------------------------------------------------
> DISCUSS:
> ----------------------------------------------------------------------
>
> Section 3.2. (Elements of procedure) says that the "interpretation of tag values is specific to the administrative domain of a particular network operator", which makes them opaque and obviously locally significant.  I then have an issue with the following text, which tries to (using rfc2119
> keywords) specify how to interpret the tags, which doesn't make sense to me given the text above:
>
>     Each tag MUST be treated as an independent identifier that MAY be
>     used in policy to perform a policy action.  Tags carried by the
>     administrative tag TLV SHOULD be used to indicate independent
>     characteristics of a node.  The administrative tag list within the
>     TLV MUST be considered an unordered list.  Whilst policies may be
>     implemented based on the presence of multiple tags (e.g., if tag A
>     AND tag B are present), they MUST NOT be reliant upon the order of
>     the tags (i.e., all policies should be considered commutative
>     operations, such that tag A preceding or following tag B does not
>     change their outcome).
>
>     To avoid incomplete or inconsistent interpretations of the per-node
>     administrative tags the same tag value MUST NOT be advertised by a
>     router in RI LSAs of different scopes.  The same tag MAY be
>     advertised in multiple RI LSAs of the same scope, for example, OSPF
>     Area Border Router (ABR) may advertise the same tag in area-scope RI
>     LSAs in multiple areas connected to the ABR.
> . . .
>     Being part of the RI LSA, the per-node administrative tag TLV must be
>     reasonably small and stable.  In particular, but not limited to,
>     implementations supporting the per-node administrative tags MUST NOT
>     tie advertised tags to changes in the network topology (both within
>     and outside the OSPF domain) or reachability of routes.
> . . .
>     instances of the RI LSA.  The node administrative tags associated
>     with a node that originates tags for the purpose of any computation
>     or processing at a receiving node SHOULD be a superset of node
>     administrative tags from all the TLVs in all the received RI LSA
>     instances originated by that node.When an RI LSA is received that
>     changes the set of tags applicable to any originating node, a
>     receiving node MUST repeat any computation or processing that is
>     based on those administrative tags.
>
> If the tags are opaque, I don't think that anything can be mandated as to how they are interpreted or what they're used for.  That is the point I want to talk about with this DISCUSS.
>
>
> ----------------------------------------------------------------------
> COMMENT:
> ----------------------------------------------------------------------
>
> Related to the DISCUSS:  Section 3.2 says that the "meaning of the Node administrative tags is generally opaque to OSPF", are there cases where the meaning is not opaque?  Even if the application is well known there is no indication that the tag is not opaque.  Yes, this is a nit with the word "generally".
>
> All the references related to rfc4970 should be changed to draft-ietf-ospf-rfc4970bis.
>
>


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David & all: thank you very much for the reviews, discussion, and =
changes. I have placed a no-objection position on this draft for =
tonight=92s IESG telechat.

Jari


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From: "Alvaro Retana (aretana)" <aretana@cisco.com>
To: Shraddha Hegde <shraddha@juniper.net>, The IESG <iesg@ietf.org>
Thread-Topic: Alvaro Retana's Discuss on draft-ietf-ospf-node-admin-tag-07: (with DISCUSS and COMMENT)
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Subject: Re: [OSPF] Alvaro Retana's Discuss on draft-ietf-ospf-node-admin-tag-07: (with DISCUSS and COMMENT)
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On 10/15/15, 12:47 AM, "Shraddha Hegde" <shraddha@juniper.net> wrote:

Shraddha:


Hi!

>Thanks for reviewing the document.
>As indicated in other thread, we need rules/regulation on how to
>interpret the tags and how to use them to get interoperable
>implementations.

That statement is a contradiction to me.  The bottom line is that if the
"node-tags can be used to express and apply locally-defined network
policies", and you're applying rules/regulations to them, then you're
limiting the ability of the operator to describe the policy they may want.

If the tags are truly opaque..then the meaning is a local
interpretation..and the use of that meaning in a policy (or any subsequent
action, or not) is completely dependent on the interpretation.  In fact,
anyone should be able to  communicate any "attribute associated with the
node" using these tags, which should leave its use and interpretation up
to the operator.


>
>> Although , the actual values of node admin tags do not need to be
>>standardized and is left to the operator's discretion to allocate values
>>and assign meanings to it, It's necessary to layout certain
>>rules/regulations and guidelines on how the tags can be used and how
>they cannot be used. That will help in getting interoperable
>implementations from vendors and avoid surprises in the field.
>For ex:  We have a statement administrative tag order has no meaning. If
>this document does not specify such a statement, there I every
>possibility some implementation will have policies that will look at the
>order in which the tags are encoded. Some other implementation which does
>not care about the order of the tag might keep changing it at every LSA
>refresh so it's hard to get them to interoperate.

This is a good point to talk about.  I understand the potential problems
with re-origination/refresh -- one of them being that the document doesn't
specify anything related to the ordering of the tags in the TLV.  In fact,
the only text that I could find related to origination of the information
is this:

   When there is a change or removal of an administrative affiliation of
   a node, the node MUST re-originate the RI LSA with the latest set of
   node administrative tags.


..it says nothing about how the set is ordered: random, chronological,
some type of numeric order, etc.  While it might have been nice (for some
applications) to have some type of predictability/persistence, not having
an order is ok.  The text in 3.2 that reads:

   The semantics of the tag order has no meaning.  That is, there is no
   implied meaning to the ordering of the tags that indicates a certain
   operation or set of operations that need to be performed based on the
   ordering.


...is also fine, and it (implicitly) covers the risk.

The piece of text I have a problem with is this:

   The administrative tag list within the TLV MUST be considered an
unordered list.=20

As you hinted above, because the draft doesn't provide guidance on
ordering, an implementation can choose to do so without harming
applications that assume nothing -- an operator may want to take advantage
of this "ordering feature" (for whatever purpose), but this document would
say "MUST be considered unordered"..limiting future policy implementations.

As with the discussion (in the other thread) about the potential
definition of well-known values (change from "MUST NOT" to "not
expected"), this is also a case where the use of normative (rfc2119)
language makes no sense (at least to me).



>Added below text in section 3.2.1
>" This section describes general rules/ regulations
>and guidelines for using and interpreting an administrative tag which will
> facilitate interoperable implementations by vendors."

3.2, right?=20


To hopefully speed the process up, let me be specific about the other
rfc2119 occurrences in 3.2 that I have an issue with (in order of
appearance):

1. "Each tag MUST be treated as an independent identifier that MAY be used
in policy to perform a policy action."

Ben already mentioned that the "MAY" seems more descriptive than
normative..  I agree.

However, there is still the "MUST".  All the tags are about a node, so
they are in fact all related.  Also, because these are opaque tags, the
operator can encode and interpret them anyway they want.  Again, the
"MUST" makes no sense.


2. "Tags carried by the administrative tag TLV SHOULD be used to indicate
independent characteristics of a node."

With this statement you're trying to limit what the operator can use the
tags for.  Operationally this sentence is easy to ignore because there's
no definition of what an "independent characteristic" is..so the use of
"SHOULD" makes no sense.


3. "The administrative tag list within the TLV MUST be considered an
unordered list.  Whilst policies may be implemented based on the presence
of multiple tags (e.g., if tag A AND tag B are present), they MUST NOT be
reliant upon the order of the tags (i.e., all policies should be
considered commutative operations, such that tag A preceding or following
tag B does not change their outcome)."

Already discussed above.


4. "To avoid incomplete or inconsistent interpretations of the per-node
administrative tags the same tag value MUST NOT be advertised by a router
in RI LSAs of different scopes."

Why not?

Given that all the tags are subject to local interpretation, it is very
possible than an operator could use the same value to mean different
things at the different scopes.

[I know that we have 32 bits...but it is obviously easier for anyone to
look at the TLV and remember what the value "5" means than to have to
remember ranges between 34322-34332..or other numbers for the different
scopes.]


5. "The same tag MAY be advertised in multiple RI LSAs of the same scope,
for example, OSPF Area Border Router (ABR) may advertise the same tag in
area-scope RI LSAs in multiple areas connected to the ABR."

I don't have a real problem with this one..but (going back to the same
point) if the tags are subject to local interpretation and use, then
advertising anything is ok..so I think that the "MAY" is really
descriptive, and shouldn't be normative.


6. "Being part of the RI LSA, the per-node administrative tag TLV must be
reasonably small and stable...implementations supporting the per-node
administrative tags MUST NOT tie advertised tags to changes in the network
topology (both within and outside the OSPF domain) or reachability of
routes."

Again, why not?  I know the point is stability.  Just as an example, the
application described in Section 4.4. (Mobile back-haul network service
deployment) says that the tags could represent a ring..which will
obviously change if the topology changes.

In this case it is obviously ok to describe the potential impact of too
many changes..but trying to control it with the "MUST NOT" is just
something that can't be enforced.



7. "The node administrative tags associated with a node that originates
tags for the purpose of any computation or processing at a receiving node
SHOULD be a superset of node administrative tags from all the TLVs in all
the received RI LSA instances originated by that node."

Not a problem with this one either..but you're probably missing a "per
flooding scope" somewhere.


8. "When an RI LSA is received that changes the set of tags applicable to
any originating node, a receiving node MUST repeat any computation or
processing that is based on those administrative tags."

The computation/processing is locally dependent and may not require
repeating even if the values changed -- much less if the set changed but
not the values.   The action should be to at least check if the change
impact the application, but I think the "MUST" is out of place.




. . .
>All the references related to rfc4970 should be changed to
>draft-ietf-ospf-rfc4970bis.
><Shraddha> Is it OK to reference drafts as Normative refrence?

Yes.

Thanks!

Alvaro.


From nobody Thu Oct 15 05:02:52 2015
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----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

I support Alvaro's DISCUSS position.  I also wonder why we are turning
OSPF into a generic container protocol.  That approach has caused issues
with BGP and I don't see it being any better doing it in OSPF.



From nobody Thu Oct 15 05:39:30 2015
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----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------


- I think Alavaro and Brian make some good points. I'll be
interested in how that discussion turns out.

- Good to see that you recognise that even opaque tag values
can expose sensitive information (the attacker isn't limited
in how they are allowed interpret what they see). However,
given that we recognise that confidentiality ought be provided
sometimes, isn't there an onus on us to actually provide some
usable way to get that service? If so, then who is looking at
that problem? If not, then why is that acceptable? (This isn't
a discuss as I don't think there is any PII or similar
information being transferred, and the confidentiality
requirement here really relates to network topology etc. But
please do correct me if one of these tags could be PII-like
and I'll make this a discuss if that's better.)



From nobody Thu Oct 15 23:20:50 2015
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From: Shraddha Hegde <shraddha@juniper.net>
To: Stephen Farrell <stephen.farrell@cs.tcd.ie>, The IESG <iesg@ietf.org>
Thread-Topic: Stephen Farrell's No Objection on draft-ietf-ospf-node-admin-tag-07: (with COMMENT)
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Date: Fri, 16 Oct 2015 06:20:40 +0000
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Cc: "draft-ietf-ospf-node-admin-tag@ietf.org" <draft-ietf-ospf-node-admin-tag@ietf.org>, "ospf-chairs@ietf.org" <ospf-chairs@ietf.org>, "ospf@ietf.org" <ospf@ietf.org>
Subject: Re: [OSPF] Stephen Farrell's No Objection on draft-ietf-ospf-node-admin-tag-07: (with COMMENT)
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From: Shraddha Hegde <shraddha@juniper.net>
To: "Alvaro Retana (aretana)" <aretana@cisco.com>, The IESG <iesg@ietf.org>
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Cc: "draft-ietf-ospf-node-admin-tag.ad@ietf.org" <draft-ietf-ospf-node-admin-tag.ad@ietf.org>, "ospf@ietf.org" <ospf@ietf.org>, "draft-ietf-ospf-node-admin-tag.shepherd@ietf.org" <draft-ietf-ospf-node-admin-tag.shepherd@ietf.org>, "draft-ietf-ospf-node-admin-tag@ietf.org" <draft-ietf-ospf-node-admin-tag@ietf.org>, "ospf-chairs@ietf.org" <ospf-chairs@ietf.org>
Subject: Re: [OSPF] Alvaro Retana's Discuss on draft-ietf-ospf-node-admin-tag-07: (with DISCUSS and COMMENT)
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Alvaro,

Thanks for the follow-up and great discussion.


Pls see in-line.

I believe normative language is necessary in some cases (although it uses l=
ocal policy) in order to get interoperable implementations among vendors.
Otherwise, implementations may claim document compliance and may not follow=
 the suggestions in the document which will be expensive to discover for
the operators.=20


Rgds
Shraddha

-----Original Message-----
From: Alvaro Retana (aretana) [mailto:aretana@cisco.com]=20
Sent: Thursday, October 15, 2015 5:03 PM
To: Shraddha Hegde <shraddha@juniper.net>; The IESG <iesg@ietf.org>
Cc: Acee Lindem (acee) <acee@cisco.com>; draft-ietf-ospf-node-admin-tag.ad@=
ietf.org; draft-ietf-ospf-node-admin-tag.shepherd@ietf.org; draft-ietf-ospf=
-node-admin-tag@ietf.org; ospf-chairs@ietf.org; ospf@ietf.org
Subject: Re: Alvaro Retana's Discuss on draft-ietf-ospf-node-admin-tag-07: =
(with DISCUSS and COMMENT)

On 10/15/15, 12:47 AM, "Shraddha Hegde" <shraddha@juniper.net> wrote:

Shraddha:


Hi!

>Thanks for reviewing the document.
>As indicated in other thread, we need rules/regulation on how to=20
>interpret the tags and how to use them to get interoperable=20
>implementations.

That statement is a contradiction to me.  The bottom line is that if the "n=
ode-tags can be used to express and apply locally-defined network policies"=
, and you're applying rules/regulations to them, then you're limiting the a=
bility of the operator to describe the policy they may want.

<Shraddha> It does not limit the ability of the operator to deploy any of t=
he use-cases requiring node-tags. Node tags are generic enough and multiple=
 tags can be associated with
                      A node so it doesn't harm to introduce one more new t=
ag into the domain when certain objectives cannot be achieved=20
                    For ex: Operator wants to apply policy based on=20
                      Tag A comes before tag B. Operator has to introduce t=
wo new tags C and D in the network and send C when A comes before B. Send D=
 when B comes before A and on the receiver write rules for C and D.

If the tags are truly opaque..then the meaning is a local interpretation..a=
nd the use of that meaning in a policy (or any subsequent action, or not) i=
s completely dependent on the interpretation.  In fact, anyone should be ab=
le to  communicate any "attribute associated with the node" using these tag=
s, which should leave its use and interpretation up to the operator.


>
>> Although , the actual values of node admin tags do not need to be=20
>>standardized and is left to the operator's discretion to allocate=20
>>values and assign meanings to it, It's necessary to layout certain=20
>>rules/regulations and guidelines on how the tags can be used and how
>they cannot be used. That will help in getting interoperable=20
>implementations from vendors and avoid surprises in the field.
>For ex:  We have a statement administrative tag order has no meaning.=20
>If this document does not specify such a statement, there I every=20
>possibility some implementation will have policies that will look at=20
>the order in which the tags are encoded. Some other implementation=20
>which does not care about the order of the tag might keep changing it=20
>at every LSA refresh so it's hard to get them to interoperate.

This is a good point to talk about.  I understand the potential problems wi=
th re-origination/refresh -- one of them being that the document doesn't sp=
ecify anything related to the ordering of the tags in the TLV.  In fact, th=
e only text that I could find related to origination of the information is =
this:

   When there is a change or removal of an administrative affiliation of
   a node, the node MUST re-originate the RI LSA with the latest set of
   node administrative tags.


..it says nothing about how the set is ordered: random, chronological, some=
 type of numeric order, etc.  While it might have been nice (for some
applications) to have some type of predictability/persistence, not having a=
n order is ok.  The text in 3.2 that reads:

<Shraddha> There is no need to specify the order. Implementations are free =
to pick any order since the receiver's actions are based on tag set and not=
 on the order.
I believe, this is clarified in section 3.2 in details.


   The semantics of the tag order has no meaning.  That is, there is no
   implied meaning to the ordering of the tags that indicates a certain
   operation or set of operations that need to be performed based on the
   ordering.


...is also fine, and it (implicitly) covers the risk.

The piece of text I have a problem with is this:

   The administrative tag list within the TLV MUST be considered an unorder=
ed list.=20

As you hinted above, because the draft doesn't provide guidance on ordering=
, an implementation can choose to do so without harming applications that a=
ssume nothing -- an operator may want to take advantage of this "ordering f=
eature" (for whatever purpose), but this document would say "MUST be consid=
ered unordered"..limiting future policy implementations.

<Shraddha> As explained in the response above, I believe admin tags are gen=
eric enough to support a case when policy is to be based on order.

As with the discussion (in the other thread) about the potential definition=
 of well-known values (change from "MUST NOT" to "not expected"), this is a=
lso a case where the use of normative (rfc2119) language makes no sense (at=
 least to me).

<Shraddha> This is changed to "are not expected to" in the latest update.

>Added below text in section 3.2.1
>" This section describes general rules/ regulations and guidelines for=20
>using and interpreting an administrative tag which will  facilitate=20
>interoperable implementations by vendors."

3.2, right?=20

<Shraddha> -08 version has section 3.2.1. Pls see attached.

To hopefully speed the process up, let me be specific about the other
rfc2119 occurrences in 3.2 that I have an issue with (in order of
appearance):

1. "Each tag MUST be treated as an independent identifier that MAY be used =
in policy to perform a policy action."

Ben already mentioned that the "MAY" seems more descriptive than normative.=
.  I agree.

<Shraddha> ok. Changing "MAY" to descriptive "may".

However, there is still the "MUST".  All the tags are about a node, so they=
 are in fact all related.  Also, because these are opaque tags, the operato=
r can encode and interpret them anyway they want.  Again, the "MUST" makes =
no sense.
<Shraddha>changing it to must.

2. "Tags carried by the administrative tag TLV SHOULD be used to indicate i=
ndependent characteristics of a node."

With this statement you're trying to limit what the operator can use the ta=
gs for.  Operationally this sentence is easy to ignore because there's no d=
efinition of what an "independent characteristic" is..so the use of "SHOULD=
" makes no sense.
<Shraddha>Changing to should


3. "The administrative tag list within the TLV MUST be considered an unorde=
red list.  Whilst policies may be implemented based on the presence of mult=
iple tags (e.g., if tag A AND tag B are present), they MUST NOT be reliant =
upon the order of the tags (i.e., all policies should be considered commuta=
tive operations, such that tag A preceding or following tag B does not chan=
ge their outcome)."

Already discussed above.


4. "To avoid incomplete or inconsistent interpretations of the per-node adm=
inistrative tags the same tag value MUST NOT be advertised by a router in R=
I LSAs of different scopes."

Why not?

Given that all the tags are subject to local interpretation, it is very pos=
sible than an operator could use the same value to mean different things at=
 the different scopes.

[I know that we have 32 bits...but it is obviously easier for anyone to loo=
k at the TLV and remember what the value "5" means than to have to remember=
 ranges between 34322-34332..or other numbers for the different scopes.]

<Shraddha> That's the exact point this statement is trying to make. There i=
s no need to associate meaning based on flooding scope. If such a feature i=
s needed operator can very well use different tags. I believe such rules he=
lp the vendors to define and implement local policies and operators to plan=
 and work in a framework. Otherwise the policy rule space becomes huge and =
not all vendors will implement all of them.

5. "The same tag MAY be advertised in multiple RI LSAs of the same scope, f=
or example, OSPF Area Border Router (ABR) may advertise the same tag in are=
a-scope RI LSAs in multiple areas connected to the ABR."

I don't have a real problem with this one..but (going back to the same
point) if the tags are subject to local interpretation and use, then advert=
ising anything is ok..so I think that the "MAY" is really descriptive, and =
shouldn't be normative.


6. "Being part of the RI LSA, the per-node administrative tag TLV must be r=
easonably small and stable...implementations supporting the per-node admini=
strative tags MUST NOT tie advertised tags to changes in the network topolo=
gy (both within and outside the OSPF domain) or reachability of routes."

Again, why not?  I know the point is stability.  Just as an example, the ap=
plication described in Section 4.4. (Mobile back-haul network service
deployment) says that the tags could represent a ring..which will obviously=
 change if the topology changes.
<Shraddha> Ring nodes are assigned tag values based on configuration and if=
 one of the links breaks and the ring is no more a closed ring, the admin t=
ag associated with the ring
                       Nodes does not change. It changes only by changing t=
he configuration on that node.
                    =20

In this case it is obviously ok to describe the potential impact of too man=
y changes..but trying to control it with the "MUST NOT" is just something t=
hat can't be enforced.

<Shraddha> I believe normative language is necessary to enforce otherwise i=
mplementations will be free to say compliance to this document and not foll=
ow any of these suggestions. Many of the inter-op issues would be discovere=
d only via testing which is expensive.=20

7. "The node administrative tags associated with a node that originates tag=
s for the purpose of any computation or processing at a receiving node SHOU=
LD be a superset of node administrative tags from all the TLVs in all the r=
eceived RI LSA instances originated by that node."

Not a problem with this one either..but you're probably missing a "per floo=
ding scope" somewhere.
<Shraddha > All RI LSA instances includes all flooding scopes.


8. "When an RI LSA is received that changes the set of tags applicable to a=
ny originating node, a receiving node MUST repeat any computation or proces=
sing that is based on those administrative tags."

The computation/processing is locally dependent and may not require repeati=
ng even if the values changed -- much less if the set changed but
not the values.   The action should be to at least check if the change
impact the application, but I think the "MUST" is out of place.

<Shraddha> Changing it as below.
" When an RI LSA is received that changes the set of tags applicable to any=
 originating node, a receiving node which has features depending on node ad=
ministrative tags MUST repeat any computation or processing that is based o=
n those administrative tags


. . .
>All the references related to rfc4970 should be changed to=20
>draft-ietf-ospf-rfc4970bis.
><Shraddha> Is it OK to reference drafts as Normative refrence?

Yes.

Thanks!

Alvaro.


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From: "Alvaro Retana (aretana)" <aretana@cisco.com>
To: Shraddha Hegde <shraddha@juniper.net>, The IESG <iesg@ietf.org>
Thread-Topic: Alvaro Retana's Discuss on draft-ietf-ospf-node-admin-tag-07: (with DISCUSS and COMMENT)
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Subject: Re: [OSPF] Alvaro Retana's Discuss on draft-ietf-ospf-node-admin-tag-07: (with DISCUSS and COMMENT)
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On 10/16/15, 5:20 AM, "Shraddha Hegde" <shraddha@juniper.net> wrote:

Shraddha:

Hi!

I'm just leaving in the still outstanding issues.

Thanks!

Alvaro.




. . .
>>For ex:  We have a statement administrative tag order has no meaning.
>>If this document does not specify such a statement, there I every
>>possibility some implementation will have policies that will look at
>>the order in which the tags are encoded. Some other implementation
>>which does not care about the order of the tag might keep changing it
>>at every LSA refresh so it's hard to get them to interoperate.
>
>This is a good point to talk about.  I understand the potential problems
>with re-origination/refresh -- one of them being that the document
>doesn't specify anything related to the ordering of the tags in the TLV.
>In fact, the only text that I could find related to origination of the
>information is this:
>
>   When there is a change or removal of an administrative affiliation of
>   a node, the node MUST re-originate the RI LSA with the latest set of
>   node administrative tags.
>
>
>..it says nothing about how the set is ordered: random, chronological,
>some type of numeric order, etc.  While it might have been nice (for some
>applications) to have some type of predictability/persistence, not having
>an order is ok.  The text in 3.2 that reads:
>
><Shraddha> There is no need to specify the order. Implementations are
>free to pick any order since the receiver's actions are based on tag set
>and not on the order.
>I believe, this is clarified in section 3.2 in details.
>
>
>   The semantics of the tag order has no meaning.  That is, there is no
>   implied meaning to the ordering of the tags that indicates a certain
>   operation or set of operations that need to be performed based on the
>   ordering.
>
>
>...is also fine, and it (implicitly) covers the risk.
>
>The piece of text I have a problem with is this:
>
>   The administrative tag list within the TLV MUST be considered an
>unordered list.=20
>
>As you hinted above, because the draft doesn't provide guidance on
>ordering, an implementation can choose to do so without harming
>applications that assume nothing -- an operator may want to take
>advantage of this "ordering feature" (for whatever purpose), but this
>document would say "MUST be considered unordered"..limiting future policy
>implementations.
>
><Shraddha> As explained in the response above, I believe admin tags are
>generic enough to support a case when policy is to be based on order.

At the expense of complicating the policy definition, configuration,
management, etc..  Contrary to what you wrote in the Abstract: "This
allows simplification, ease of management and control.."


I think we agree that order doesn't have to be specified.

What we're not in agreement on is the fact that if an implementation
chooses to implement an order (as you said above "Implementations are free
to pick any order"), and provides policy constructs to act on the order
(implementation-specific detail), then the operator can use those features
to his/her advantage regardless of what this document says.  IOW, "MUST be
considered an unordered list" doesn't reflect a reasonable expectation and
can't really be enforced.




>As with the discussion (in the other thread) about the potential
>definition of well-known values (change from "MUST NOT" to "not
>expected"), this is also a case where the use of normative (rfc2119)
>language makes no sense (at least to me).
>
><Shraddha> This is changed to "are not expected to" in the latest update.

The text in -08 still says:

   administrative tags.  The administrative tag list within the TLV MUST
   be considered an unordered list.  Whilst policies may be implemented
   based on the presence of multiple tags (e.g., if tag A AND tag B are
   present), they MUST NOT be reliant upon the order of the tags (i.e.,
   all policies should be considered commutative operations, such that
   tag A preceding or following tag B does not change their outcome).




>
>>Added below text in section 3.2.1
>>" This section describes general rules/ regulations and guidelines for
>>using and interpreting an administrative tag which will  facilitate
>>interoperable implementations by vendors."
>
>3.2, right?=20
>
><Shraddha> -08 version has section 3.2.1. Pls see attached.
>
>To hopefully speed the process up, let me be specific about the other
>rfc2119 occurrences in 3.2 that I have an issue with (in order of
>appearance):
>
>1. "Each tag MUST be treated as an independent identifier that MAY be
>used in policy to perform a policy action."
>
>Ben already mentioned that the "MAY" seems more descriptive than
>normative..  I agree.
>
><Shraddha> ok. Changing "MAY" to descriptive "may".
>
>However, there is still the "MUST".  All the tags are about a node, so
>they are in fact all related.  Also, because these are opaque tags, the
>operator can encode and interpret them anyway they want.  Again, the
>"MUST" makes no sense.
><Shraddha>changing it to must.
>
>2. "Tags carried by the administrative tag TLV SHOULD be used to indicate
>independent characteristics of a node."
>
>With this statement you're trying to limit what the operator can use the
>tags for.  Operationally this sentence is easy to ignore because there's
>no definition of what an "independent characteristic" is..so the use of
>"SHOULD" makes no sense.
><Shraddha>Changing to should
>
>
>3. "The administrative tag list within the TLV MUST be considered an
>unordered list.  Whilst policies may be implemented based on the presence
>of multiple tags (e.g., if tag A AND tag B are present), they MUST NOT be
>reliant upon the order of the tags (i.e., all policies should be
>considered commutative operations, such that tag A preceding or following
>tag B does not change their outcome)."
>
>Already discussed above.
>
>
>4. "To avoid incomplete or inconsistent interpretations of the per-node
>administrative tags the same tag value MUST NOT be advertised by a router
>in RI LSAs of different scopes."
>
>Why not?
>
>Given that all the tags are subject to local interpretation, it is very
>possible than an operator could use the same value to mean different
>things at the different scopes.
>
>[I know that we have 32 bits...but it is obviously easier for anyone to
>look at the TLV and remember what the value "5" means than to have to
>remember ranges between 34322-34332..or other numbers for the different
>scopes.]
>
><Shraddha> That's the exact point this statement is trying to make. There
>is no need to associate meaning based on flooding scope. If such a
>feature is needed operator can very well use different tags. I believe
>such rules help the vendors to define and implement local policies and
>operators to plan and work in a framework. Otherwise the policy rule
>space becomes huge and not all vendors will implement all of them.

Again, you're claiming an opaque space subject to local interpretation,
but then constraining how to use them..and not meeting the
"simplification, ease of management and control" claim.

>From section 2 (updated text): "The choice of what scope at which to flood
the group tags is a matter of local policy."  And form the new 3.2.1: "The
meaning of a per-node administrative tag is defined by the network local
policy and is controlled via the configuration."  Apparently not. :-(

BTW, I noticed that in -08 you also added:

   ... If a node
   administrative tag is received in different scopes, the conflicting
   tag SHOULD not be used and this situation SHOULD be logged as an
   error including the tag with conflicting scopes and the
   originator(s).


[I know this was put in to answer the SecDir review related to what should
be done if the same value was received with different flooding scopes.]

Which is the "conflicting tag"?  Does it mean that for all scopes that
specific value is not to be used?  If so, what about policies in which the
operator is looking for two (or maybe more) tags to be present to take an
action?  If all the tags for all scopes are declared conflicting then you
may be breaking more than one policy -- and depending on the expected
action the disruption may be significant.

. . . =20
>6. "Being part of the RI LSA, the per-node administrative tag TLV must be
>reasonably small and stable...implementations supporting the per-node
>administrative tags MUST NOT tie advertised tags to changes in the
>network topology (both within and outside the OSPF domain) or
>reachability of routes."
>
>Again, why not?  I know the point is stability.  Just as an example, the
>application described in Section 4.4. (Mobile back-haul network service
>deployment) says that the tags could represent a ring..which will
>obviously change if the topology changes.
><Shraddha> Ring nodes are assigned tag values based on configuration and
>if one of the links breaks and the ring is no more a closed ring, the
>admin tag associated with the ring
>                       Nodes does not change. It changes only by changing
>the configuration on that node.
>                 =20
>
>In this case it is obviously ok to describe the potential impact of too
>many changes..but trying to control it with the "MUST NOT" is just
>something that can't be enforced.
>
><Shraddha> I believe normative language is necessary to enforce otherwise
>implementations will be free to say compliance to this document and not
>follow any of these suggestions. Many of the inter-op issues would be
>discovered only via testing which is expensive.

Suggestions shouldn't be normative.

The real problem is not whether the tags are configured to change when the
topology does, the real problem is for the tags to change a lot and become
unstable.  The only reason the tags will become unstable due to topology
changes is if the topology is unstable itself.  However, there may be
other reasons for tag instability.  For example, what it someone decides
they want a tag to reflect available bandwidth (or any other constantly
changing parameter)?

My point here is that it is ok for you to put in the suggestion about
stability.  It would be even better if you talked about rate limiting the
origination of the TLVs with updated/changed tags (which is the stability
you seem to want to enforce); you can even make that normative. However,
you're trying (again) to limit potential applications that may not result
in the stability problem that you're trying to prevent..and at the same
time leaving the door open to other potential stability issues.

In short, if stability is your concern, then address it directly!


>=20
>7. "The node administrative tags associated with a node that originates
>tags for the purpose of any computation or processing at a receiving node
>SHOULD be a superset of node administrative tags from all the TLVs in all
>the received RI LSA instances originated by that node."
>
>Not a problem with this one either..but you're probably missing a "per
>flooding scope" somewhere.
><Shraddha > All RI LSA instances includes all flooding scopes.

This goes back to our conversation about scopes above.


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Subject: Re: [OSPF] Alvaro Retana's Discuss on draft-ietf-ospf-node-admin-tag-07: (with DISCUSS and COMMENT)
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Alvaro,

Picking up on one particular point:


On 16 October 2015 at 05:50:48, Alvaro Retana (aretana) (aretana=40cisco.=
com) wrote:
> > What we're not in agreement on is the fact that if an implementation =
=20
> chooses to implement an order (as you said above =22Implementations =20
> are free
> to pick any order=22), and provides policy constructs to act on =20
> the order
> (implementation-specific detail), then the operator can use =20
> those features
> to his/her advantage regardless of what this document says. =20
> IOW, =22MUST be
> considered an unordered list=22 doesn't reflect a reasonable =20
> expectation and
> can't really be enforced.

I think the opposite is true. If we have no guarantee of order, then vend=
or C can sort tags numerically ascending, and vendor D can sort tags nume=
rically descending. Based on this, one could have a policy that matches (=
1 BE=46ORE 2) which is triggered only when advertisements are received fr=
om a vendor C box, and not a vendor D one.

Given that operationally, we do not care whether it was a vendor C or D b=
ox =5B0=5D, then this actually will mean that we have different logic app=
lied based on the implementation choice. If we are to allow tags to be co=
mbined non-commutitvately, then we need to have logic that says that the =
ordering matters (and defined how it is done). If we do not, then we need=
 strong guidance to implementors (of the specification AND operators) tha=
t they cannot rely on order.

A murky middle ground is that we end up with inconsistent treatment of ta=
gs across different implementations, which creates pain for network opera=
tors trying to use them, or introducing a new implementation into their n=
etwork (all policies that previously worked based on order, suddenly don=E2=
=80=99t based on this new implementation having different logic).

r.

=5B0=5D: And if we did, we could just create a new tag that specifies the=
 vendor, like we could have one that specifies the role.




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Subject: Re: [OSPF] Stephen Farrell's No Objection on draft-ietf-ospf-node-admin-tag-07: (with COMMENT)
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On 16/10/15 07:20, Shraddha Hegde wrote:
> Hi Stephen,
> 
> Pls see inline..
> 
> -----Original Message----- From: Stephen Farrell
> [mailto:stephen.farrell@cs.tcd.ie] Sent: Thursday, October 15, 2015
> 6:09 PM To: The IESG <iesg@ietf.org> Cc:
> draft-ietf-ospf-node-admin-tag@ietf.org; ospf-chairs@ietf.org;
> acee@cisco.com; ospf@ietf.org Subject: Stephen Farrell's No Objection
> on draft-ietf-ospf-node-admin-tag-07: (with COMMENT)
> 
> Stephen Farrell has entered the following ballot position for 
> draft-ietf-ospf-node-admin-tag-07: No Objection
> 
> When responding, please keep the subject line intact and reply to all
> email addresses included in the To and CC lines. (Feel free to cut
> this introductory paragraph, however.)
> 
> 
> Please refer to
> https://www.ietf.org/iesg/statement/discuss-criteria.html for more
> information about IESG DISCUSS and COMMENT positions.
> 
> 
> The document, along with other ballot positions, can be found here: 
> https://datatracker.ietf.org/doc/draft-ietf-ospf-node-admin-tag/
> 
> 
> 
> ----------------------------------------------------------------------
>
> 
COMMENT:
> ----------------------------------------------------------------------
>
> 
> 
> - I think Alavaro and Brian make some good points. I'll be interested
> in how that discussion turns out.
> 
> - Good to see that you recognise that even opaque tag values can
> expose sensitive information (the attacker isn't limited in how they
> are allowed interpret what they see). However, given that we
> recognise that confidentiality ought be provided sometimes, isn't
> there an onus on us to actually provide some usable way to get that
> service? If so, then who is looking at that problem? If not, then why
> is that acceptable? (This isn't a discuss as I don't think there is
> any PII or similar information being transferred, and the
> confidentiality requirement here really relates to network topology
> etc. But please do correct me if one of these tags could be PII-like
> and I'll make this a discuss if that's better.)
> 
> <Shraddha> OSPF in itself does not have  ways to provide
> confidentiality but in cases where it is needed OSPF can run on top
> of IPSEC tunnels which can encrypt the OSPF control packets. IPSEC
> mechanisms can also be applied to OSPF packets using RFC 4552 for
> OSPFv3. Adding below text to the draft.
> 
> Node administrative tags may be used by operators to indicate
> geographical location or other sensitive information. As indicated in
> <xref target="RFC2328"/> and <xref target="RFC5340"/> OSPF
> authentication mechanisms do not provide confidentiality and the
> information carried in node administrative tags could be leaked to an
> IGP snooper. Confidentiality for the OSPF control packets can be
> achieved by either running OSPF on top of IP Security (IPSEC) tunnels
> or by applying IPSEC based security mechanisms as described in <xref
> target="RFC4552"/>
> 

That's good text, but is it realistic to run OSPF over IPsec in a
way that'll prevent snooping but not get in the way of routing? I'd
much prefer we admit there can be an issue for which we don't have
a good answer instead of us pretending there's an answer when we
know or suspect the mitigation won't work in practice.

So unless you know that OSPF can be run in practice over IPsec in
a way that'll mitigate this I'd say removing the last sentence would
be much better.

Cheers,
S.


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Thread-Topic: Alvaro Retana's Discuss on draft-ietf-ospf-node-admin-tag-07: (with DISCUSS and COMMENT)
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Subject: Re: [OSPF] Alvaro Retana's Discuss on draft-ietf-ospf-node-admin-tag-07: (with DISCUSS and COMMENT)
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Alvaro, Shraddha,

Please see inline [Bruno]

> From: Alvaro Retana (aretana) [mailto:aretana@cisco.com]
> Sent: Friday, October 16, 2015 1:50 PM
>=20
> On 10/16/15, 5:20 AM, "Shraddha Hegde" <shraddha@juniper.net> wrote:
>=20
> Shraddha:
>=20
> Hi!
>=20
> I'm just leaving in the still outstanding issues.
>=20
> Thanks!
>=20
> Alvaro.
>=20
>=20
>=20
>=20
> . . .
> >>For ex:  We have a statement administrative tag order has no meaning.
> >>If this document does not specify such a statement, there I every
> >>possibility some implementation will have policies that will look at
> >>the order in which the tags are encoded. Some other implementation
> >>which does not care about the order of the tag might keep changing it
> >>at every LSA refresh so it's hard to get them to interoperate.
> >
> >This is a good point to talk about.  I understand the potential problems
> >with re-origination/refresh -- one of them being that the document
> >doesn't specify anything related to the ordering of the tags in the TLV.
> >In fact, the only text that I could find related to origination of the
> >information is this:
> >
> >   When there is a change or removal of an administrative affiliation of
> >   a node, the node MUST re-originate the RI LSA with the latest set of
> >   node administrative tags.
> >
> >
> >..it says nothing about how the set is ordered: random, chronological,
> >some type of numeric order, etc.  While it might have been nice (for some
> >applications) to have some type of predictability/persistence, not having
> >an order is ok.  The text in 3.2 that reads:
> >
> ><Shraddha> There is no need to specify the order. Implementations are
> >free to pick any order since the receiver's actions are based on tag set
> >and not on the order.
> >I believe, this is clarified in section 3.2 in details.
> >
> >
> >   The semantics of the tag order has no meaning.  That is, there is no
> >   implied meaning to the ordering of the tags that indicates a certain
> >   operation or set of operations that need to be performed based on the
> >   ordering.
> >
> >
> >...is also fine, and it (implicitly) covers the risk.

[Bruno] Good. [REF1]

> >
> >The piece of text I have a problem with is this:
> >
> >   The administrative tag list within the TLV MUST be considered an
> >unordered list.

[Bruno]
Personally, I see what Shraddha means, and I'm fine with the text.
But If you have a problem with this sentence, I'd say we could remove it as=
, for me, [REF1] say the same thing and would be enough.

> >As you hinted above, because the draft doesn't provide guidance on
> >ordering, an implementation can choose to do so without harming
> >applications that assume nothing -- an operator may want to take
> >advantage of this "ordering feature" (for whatever purpose), but this
> >document would say "MUST be considered unordered"..limiting future
> policy
> >implementations.
> >
> ><Shraddha> As explained in the response above, I believe admin tags are
> >generic enough to support a case when policy is to be based on order.
>=20
> At the expense of complicating the policy definition, configuration,
> management, etc..  Contrary to what you wrote in the Abstract: "This
> allows simplification, ease of management and control.."
>=20
>=20
> I think we agree that order doesn't have to be specified.
>=20
> What we're not in agreement on is the fact that if an implementation
> chooses to implement an order (as you said above "Implementations are free
> to pick any order"), and provides policy constructs to act on the order
> (implementation-specific detail), then the operator can use those features
> to his/her advantage regardless of what this document says.=20

[Bruno] I don't think so because 2 different implementations are involved:
- the one (a) setting the tag (and advertising it in OSPF)
- the one (b) receiving it in OSPF and using the it in the policy

The point is that node "b" cannot assume that node "a" advertised the tags =
in OSPF in the same order that the operator has configured.


> IOW, "MUST be
> considered an unordered list" doesn't reflect a reasonable expectation and
> can't really be enforced.

[Bruno] Again IMO an option is to remove that sentence. Or may be :s/MUST b=
e considered/is" which remove the "enforcibility" issue.
 The more important one is the next "Whilst policies may be implemented
   based on the presence of multiple tags [...], they MUST NOT be reliant u=
pon the order of the tags [..]"
with possibly :s/order of the tags/order of the received tags"

-- Bruno=20

>=20
>=20
>=20
> >As with the discussion (in the other thread) about the potential
> >definition of well-known values (change from "MUST NOT" to "not
> >expected"), this is also a case where the use of normative (rfc2119)
> >language makes no sense (at least to me).
> >
> ><Shraddha> This is changed to "are not expected to" in the latest update.
>=20
> The text in -08 still says:
>=20
>    administrative tags.  The administrative tag list within the TLV MUST
>    be considered an unordered list.  Whilst policies may be implemented
>    based on the presence of multiple tags (e.g., if tag A AND tag B are
>    present), they MUST NOT be reliant upon the order of the tags (i.e.,
>    all policies should be considered commutative operations, such that
>    tag A preceding or following tag B does not change their outcome).
>=20
>=20
>=20
>=20
> >
> >>Added below text in section 3.2.1
> >>" This section describes general rules/ regulations and guidelines for
> >>using and interpreting an administrative tag which will  facilitate
> >>interoperable implementations by vendors."
> >
> >3.2, right?
> >
> ><Shraddha> -08 version has section 3.2.1. Pls see attached.
> >
> >To hopefully speed the process up, let me be specific about the other
> >rfc2119 occurrences in 3.2 that I have an issue with (in order of
> >appearance):
> >
> >1. "Each tag MUST be treated as an independent identifier that MAY be
> >used in policy to perform a policy action."
> >
> >Ben already mentioned that the "MAY" seems more descriptive than
> >normative..  I agree.
> >
> ><Shraddha> ok. Changing "MAY" to descriptive "may".
> >
> >However, there is still the "MUST".  All the tags are about a node, so
> >they are in fact all related.  Also, because these are opaque tags, the
> >operator can encode and interpret them anyway they want.  Again, the
> >"MUST" makes no sense.
> ><Shraddha>changing it to must.
> >
> >2. "Tags carried by the administrative tag TLV SHOULD be used to indicate
> >independent characteristics of a node."
> >
> >With this statement you're trying to limit what the operator can use the
> >tags for.  Operationally this sentence is easy to ignore because there's
> >no definition of what an "independent characteristic" is..so the use of
> >"SHOULD" makes no sense.
> ><Shraddha>Changing to should
> >
> >
> >3. "The administrative tag list within the TLV MUST be considered an
> >unordered list.  Whilst policies may be implemented based on the presence
> >of multiple tags (e.g., if tag A AND tag B are present), they MUST NOT be
> >reliant upon the order of the tags (i.e., all policies should be
> >considered commutative operations, such that tag A preceding or following
> >tag B does not change their outcome)."
> >
> >Already discussed above.
> >
> >
> >4. "To avoid incomplete or inconsistent interpretations of the per-node
> >administrative tags the same tag value MUST NOT be advertised by a router
> >in RI LSAs of different scopes."
> >
> >Why not?
> >
> >Given that all the tags are subject to local interpretation, it is very
> >possible than an operator could use the same value to mean different
> >things at the different scopes.
> >
> >[I know that we have 32 bits...but it is obviously easier for anyone to
> >look at the TLV and remember what the value "5" means than to have to
> >remember ranges between 34322-34332..or other numbers for the
> different
> >scopes.]
> >
> ><Shraddha> That's the exact point this statement is trying to make. There
> >is no need to associate meaning based on flooding scope. If such a
> >feature is needed operator can very well use different tags. I believe
> >such rules help the vendors to define and implement local policies and
> >operators to plan and work in a framework. Otherwise the policy rule
> >space becomes huge and not all vendors will implement all of them.
>=20
> Again, you're claiming an opaque space subject to local interpretation,
> but then constraining how to use them..and not meeting the
> "simplification, ease of management and control" claim.
>=20
> >From section 2 (updated text): "The choice of what scope at which to flo=
od
> the group tags is a matter of local policy."  And form the new 3.2.1: "The
> meaning of a per-node administrative tag is defined by the network local
> policy and is controlled via the configuration."  Apparently not. :-(
>=20
> BTW, I noticed that in -08 you also added:
>=20
>    ... If a node
>    administrative tag is received in different scopes, the conflicting
>    tag SHOULD not be used and this situation SHOULD be logged as an
>    error including the tag with conflicting scopes and the
>    originator(s).
>=20
>=20
> [I know this was put in to answer the SecDir review related to what should
> be done if the same value was received with different flooding scopes.]
>=20
> Which is the "conflicting tag"?  Does it mean that for all scopes that
> specific value is not to be used?  If so, what about policies in which the
> operator is looking for two (or maybe more) tags to be present to take an
> action?  If all the tags for all scopes are declared conflicting then you
> may be breaking more than one policy -- and depending on the expected
> action the disruption may be significant.
>=20
> . . .
> >6. "Being part of the RI LSA, the per-node administrative tag TLV must be
> >reasonably small and stable...implementations supporting the per-node
> >administrative tags MUST NOT tie advertised tags to changes in the
> >network topology (both within and outside the OSPF domain) or
> >reachability of routes."
> >
> >Again, why not?  I know the point is stability.  Just as an example, the
> >application described in Section 4.4. (Mobile back-haul network service
> >deployment) says that the tags could represent a ring..which will
> >obviously change if the topology changes.
> ><Shraddha> Ring nodes are assigned tag values based on configuration and
> >if one of the links breaks and the ring is no more a closed ring, the
> >admin tag associated with the ring
> >                       Nodes does not change. It changes only by changing
> >the configuration on that node.
> >
> >
> >In this case it is obviously ok to describe the potential impact of too
> >many changes..but trying to control it with the "MUST NOT" is just
> >something that can't be enforced.
> >
> ><Shraddha> I believe normative language is necessary to enforce otherwise
> >implementations will be free to say compliance to this document and not
> >follow any of these suggestions. Many of the inter-op issues would be
> >discovered only via testing which is expensive.
>=20
> Suggestions shouldn't be normative.
>=20
> The real problem is not whether the tags are configured to change when the
> topology does, the real problem is for the tags to change a lot and become
> unstable.  The only reason the tags will become unstable due to topology
> changes is if the topology is unstable itself.  However, there may be
> other reasons for tag instability.  For example, what it someone decides
> they want a tag to reflect available bandwidth (or any other constantly
> changing parameter)?
>=20
> My point here is that it is ok for you to put in the suggestion about
> stability.  It would be even better if you talked about rate limiting the
> origination of the TLVs with updated/changed tags (which is the stability
> you seem to want to enforce); you can even make that normative. However,
> you're trying (again) to limit potential applications that may not result
> in the stability problem that you're trying to prevent..and at the same
> time leaving the door open to other potential stability issues.
>=20
> In short, if stability is your concern, then address it directly!
>=20
>=20
> >
> >7. "The node administrative tags associated with a node that originates
> >tags for the purpose of any computation or processing at a receiving node
> >SHOULD be a superset of node administrative tags from all the TLVs in all
> >the received RI LSA instances originated by that node."
> >
> >Not a problem with this one either..but you're probably missing a "per
> >flooding scope" somewhere.
> ><Shraddha > All RI LSA instances includes all flooding scopes.
>=20
> This goes back to our conversation about scopes above.


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From: "Alvaro Retana (aretana)" <aretana@cisco.com>
To: Rob Shakir <rjs@rob.sh>, Shraddha Hegde <shraddha@juniper.net>, The IESG <iesg@ietf.org>
Thread-Topic: Alvaro Retana's Discuss on draft-ietf-ospf-node-admin-tag-07: (with DISCUSS and COMMENT)
Thread-Index: AQHRBcJuCumG1ZA/D0Cj5vEpcyU0Zp5sUYCAgAAuTQCAAbA8AP//5uGAgABXaoD//9NAgA==
Date: Fri, 16 Oct 2015 14:22:53 +0000
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References: <20151013142127.29680.19611.idtracker@ietfa.amsl.com> <BY1PR0501MB1381AA752314C8677284A2F5D53E0@BY1PR0501MB1381.namprd05.prod.outlook.com> <D244F4BA.DB9E8%aretana@cisco.com> <BY1PR0501MB1381A540ECC4E6F62651BF6ED53D0@BY1PR0501MB1381.namprd05.prod.outlook.com> <D2464C12.DBDFA%aretana@cisco.com> <etPan.5620f609.42befee7.19d1@piccolo.local>
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Subject: Re: [OSPF] Alvaro Retana's Discuss on draft-ietf-ospf-node-admin-tag-07: (with DISCUSS and COMMENT)
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On 10/16/15, 9:03 AM, "Rob Shakir" <rjs@rob.sh> wrote:

Rob:

Hi!

>Picking up on one particular point:

Are you advocating for the draft to specify an ordering scheme, or at just
leaving it at "MUST be considered unordered"?  Your text below says one or
the other, just wondering about preference.

Thanks!

Alvaro.


>
>
>On 16 October 2015 at 05:50:48, Alvaro Retana (aretana)
>(aretana@cisco.com) wrote:
>> > What we're not in agreement on is the fact that if an implementation
>> chooses to implement an order (as you said above "Implementations
>> are free
>> to pick any order"), and provides policy constructs to act on
>> the order
>> (implementation-specific detail), then the operator can use
>> those features
>> to his/her advantage regardless of what this document says.
>> IOW, "MUST be
>> considered an unordered list" doesn't reflect a reasonable
>> expectation and
>> can't really be enforced.
>
>I think the opposite is true. If we have no guarantee of order, then
>vendor C can sort tags numerically ascending, and vendor D can sort tags
>numerically descending. Based on this, one could have a policy that
>matches (1 BEFORE 2) which is triggered only when advertisements are
>received from a vendor C box, and not a vendor D one.
>
>Given that operationally, we do not care whether it was a vendor C or D
>box [0], then this actually will mean that we have different logic
>applied based on the implementation choice. If we are to allow tags to be
>combined non-commutitvately, then we need to have logic that says that
>the ordering matters (and defined how it is done). If we do not, then we
>need strong guidance to implementors (of the specification AND operators)
>that they cannot rely on order.
>
>A murky middle ground is that we end up with inconsistent treatment of
>tags across different implementations, which creates pain for network
>operators trying to use them, or introducing a new implementation into
>their network (all policies that previously worked based on order,
>suddenly don=B9t based on this new implementation having different logic).
>
>r.
>
>[0]: And if we did, we could just create a new tag that specifies the
>vendor, like we could have one that specifies the role.
>
>
>


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From: Rob Shakir <rjs@rob.sh>
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Subject: Re: [OSPF] Alvaro Retana's Discuss on draft-ietf-ospf-node-admin-tag-07: (with DISCUSS and COMMENT)
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Hi Alvaro,

On October 16, 2015 at 08:23:44, Alvaro Retana (aretana) (aretana=40cisco=
.com) wrote:
> Are you advocating for the draft to specify an ordering scheme, or at j=
ust
> leaving it at =22MUST be considered unordered=22=3F Your text below say=
s one or
> the other, just wondering about preference.

I prefer leaving =22MUST be considered unordered=E2=80=9D in the document=
, I currently cannot envisage any use cases that would need to consider o=
rdering (in general, I think this can be dealt with by creating a new tag=
).

Kind regards,
r.


From nobody Fri Oct 16 07:32:30 2015
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Subject: Re: [OSPF] Alvaro Retana's Discuss on draft-ietf-ospf-node-admin-tag-07: (with DISCUSS and COMMENT)
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From: "Alvaro Retana (aretana)" <aretana@cisco.com>
To: "Acee Lindem (acee)" <acee@cisco.com>, Rob Shakir <rjs@rob.sh>, "Shraddha Hegde" <shraddha@juniper.net>, The IESG <iesg@ietf.org>
Thread-Topic: Alvaro Retana's Discuss on draft-ietf-ospf-node-admin-tag-07: (with DISCUSS and COMMENT)
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Date: Fri, 16 Oct 2015 14:39:10 +0000
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Subject: Re: [OSPF] Alvaro Retana's Discuss on draft-ietf-ospf-node-admin-tag-07: (with DISCUSS and COMMENT)
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On 10/16/15, 10:31 AM, "Acee Lindem (acee)" <acee@cisco.com> wrote:

Hi!

>This is a great discussion! It is unfortunate that it did not occur
>earlier on the OSPF WG list.

Couldn't agree more! :-)

. . .
>On 10/16/15, 10:26 AM, "Rob Shakir" <rjs@rob.sh> wrote:
>
>>. . .
>>I prefer leaving "MUST be considered unordered=B2 in the document, I
>>currently cannot envisage any use cases that would need to consider
>>ordering (in general, I think this can be dealt with by creating a new
>>tag).
>
>In thinking about this and case of nondeterministic behavior with varying
>implementation ordering, I think we should keep it as unordered and
>discourage the creation of policies that are sensitive to ordering.

Ok..that's fine with me.

Thanks!

Alvaro.


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Date: Fri, 16 Oct 2015 20:53:13 +0530
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From: <bruno.decraene@orange.com>
To: "Acee Lindem (acee)" <acee@cisco.com>, Rob Shakir <rjs@rob.sh>, "Shraddha Hegde" <shraddha@juniper.net>, The IESG <iesg@ietf.org>, "Alvaro Retana (aretana)" <aretana@cisco.com>
Thread-Topic: Alvaro Retana's Discuss on draft-ietf-ospf-node-admin-tag-07: (with DISCUSS and COMMENT)
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Date: Fri, 16 Oct 2015 15:26:22 +0000
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Subject: Re: [OSPF] Alvaro Retana's Discuss on draft-ietf-ospf-node-admin-tag-07: (with DISCUSS and COMMENT)
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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Anil Kumar S N <anil.ietf@gmail.com>, "Alvaro Retana (aretana)" <aretana@cisco.com>
Thread-Topic: [OSPF] Alvaro Retana's Discuss on draft-ietf-ospf-node-admin-tag-07: (with DISCUSS and COMMENT)
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References: <20151013142127.29680.19611.idtracker@ietfa.amsl.com> <BY1PR0501MB1381AA752314C8677284A2F5D53E0@BY1PR0501MB1381.namprd05.prod.outlook.com> <D244F4BA.DB9E8%aretana@cisco.com> <BY1PR0501MB1381A540ECC4E6F62651BF6ED53D0@BY1PR0501MB1381.namprd05.prod.outlook.com> <D2464C12.DBDFA%aretana@cisco.com> <etPan.5620f609.42befee7.19d1@piccolo.local> <D2467F6C.DBF6D%aretana@cisco.com> <etPan.5621091b.7b9078ae.ae6d@jivecommunications.com> <D24681AA.36A15%acee@cisco.com> <D2468413.DBF91%aretana@cisco.com> <5621166b.29e5420a.f08a5.ffffab89@mx.google.com>
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Subject: Re: [OSPF] Alvaro Retana's Discuss on draft-ietf-ospf-node-admin-tag-07: (with DISCUSS and COMMENT)
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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Shraddha Hegde <shraddha@juniper.net>, "draft-ietf-ospf-two-part-metric@ietf.org" <draft-ietf-ospf-two-part-metric@ietf.org>
Thread-Topic: draft-ietf-ospf-two-part-metric : Max metric handling
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From: Shraddha Hegde <shraddha@juniper.net>
To: "Alvaro Retana (aretana)" <aretana@cisco.com>, The IESG <iesg@ietf.org>
Thread-Topic: Alvaro Retana's Discuss on draft-ietf-ospf-node-admin-tag-07: (with DISCUSS and COMMENT)
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Cc: "draft-ietf-ospf-node-admin-tag.ad@ietf.org" <draft-ietf-ospf-node-admin-tag.ad@ietf.org>, "ospf@ietf.org" <ospf@ietf.org>, "draft-ietf-ospf-node-admin-tag.shepherd@ietf.org" <draft-ietf-ospf-node-admin-tag.shepherd@ietf.org>, "draft-ietf-ospf-node-admin-tag@ietf.org" <draft-ietf-ospf-node-admin-tag@ietf.org>, "ospf-chairs@ietf.org" <ospf-chairs@ietf.org>
Subject: Re: [OSPF] Alvaro Retana's Discuss on draft-ietf-ospf-node-admin-tag-07: (with DISCUSS and COMMENT)
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Alvaro,

We closed on a few points but few more are still open.

<.... snipping to open points...>

>As with the discussion (in the other thread) about the potential=20
>definition of well-known values (change from "MUST NOT" to "not=20
>expected"), this is also a case where the use of normative (rfc2119)=20
>language makes no sense (at least to me).
>
><Shraddha> This is changed to "are not expected to" in the latest update.

The text in -08 still says:

   administrative tags.  The administrative tag list within the TLV MUST
   be considered an unordered list.  Whilst policies may be implemented
   based on the presence of multiple tags (e.g., if tag A AND tag B are
   present), they MUST NOT be reliant upon the order of the tags (i.e.,
   all policies should be considered commutative operations, such that
   tag A preceding or following tag B does not change their outcome).

<Shraddha> -08 version is updated as below for the well known values. Is yo=
ur comment about well known values or tag order?

"New OSPF
extensions are not expected to require use of per-node administrative
tags or define well-known tag values"
---------------------------------------------------------------------------=
-----------------------

>From section 2 (updated text): "The choice of what scope at which to flood =
the group tags is a matter of local policy."  And form the new 3.2.1: "The =
meaning of a per-node administrative tag is defined by the network local po=
licy and is controlled via the configuration."  Apparently not. :-(

BTW, I noticed that in -08 you also added:

   ... If a node
   administrative tag is received in different scopes, the conflicting
   tag SHOULD not be used and this situation SHOULD be logged as an
   error including the tag with conflicting scopes and the
   originator(s).


[I know this was put in to answer the SecDir review related to what should =
be done if the same value was received with different flooding scopes.]

Which is the "conflicting tag"?  Does it mean that for all scopes that spec=
ific value is not to be used?=20
>From section 2 (updated text): "The choice of what scope at which to flood =
the group tags is a matter of local policy."  And form the new 3.2.1: "The =
meaning of a per-node administrative tag is defined by the network local po=
licy and is controlled via the configuration."  Apparently not. :-(

BTW, I noticed that in -08 you also added:

   ... If a node
   administrative tag is received in different scopes, the conflicting
   tag SHOULD not be used and this situation SHOULD be logged as an
   error including the tag with conflicting scopes and the
   originator(s).


[I know this was put in to answer the SecDir review related to what should =
be done if the same value was received with different flooding scopes.]

Which is the "conflicting tag"?  Does it mean that for all scopes that spec=
ific value is not to be used? =20

<Shraddha> Tags are associated with nodes which advertise them. There is no=
 need to associate tags with scopes for any policy action. If an operator h=
as any such usecase new tags can be associated with such a use-case.


If so, what about policies in which the operator is looking for two (or may=
be more) tags to be present to take an action? =20

<Shraddha> The issue being described here is about same tag appearing in di=
fferent scopes on a non-ABR. It's perfectly valid to associate multiple tag=
s with a node.
=20
If all the tags for all scopes are declared conflicting then you may be bre=
aking more than one policy -- and depending on the expected action the disr=
uption may be significant

---------------------------------------------------------------------------=
----------------------------------------------------------------------

The real problem is not whether the tags are configured to change when the =
topology does, the real problem is for the tags to change a lot and become =
unstable.  The only reason the tags will become unstable due to topology ch=
anges is if the topology is unstable itself.  However, there may be other r=
easons for tag instability.  For example, what it someone decides they want=
 a tag to reflect available bandwidth (or any other constantly changing par=
ameter)?

My point here is that it is ok for you to put in the suggestion about stabi=
lity.  It would be even better if you talked about rate limiting the origin=
ation of the TLVs with updated/changed tags (which is the stability you see=
m to want to enforce); you can even make that normative. However, you're tr=
ying (again) to limit potential applications that may not result in the sta=
bility problem that you're trying to prevent..and at the same time leaving =
the door open to other potential stability issues.

In short, if stability is your concern, then address it directly!

<Shraddha> The paragraph begins with below statement.

"Being part of the RI LSA, the per-node administrative tag
TLV must be reasonably small and stable."

I think that should address the stability problems.


---------------------------------------------------------------------------=
------------------------------------------------------------


Rgds
Shraddha

-----Original Message-----
From: Alvaro Retana (aretana) [mailto:aretana@cisco.com]=20
Sent: Friday, October 16, 2015 5:20 PM
To: Shraddha Hegde <shraddha@juniper.net>; The IESG <iesg@ietf.org>
Cc: Acee Lindem (acee) <acee@cisco.com>; draft-ietf-ospf-node-admin-tag.ad@=
ietf.org; draft-ietf-ospf-node-admin-tag.shepherd@ietf.org; draft-ietf-ospf=
-node-admin-tag@ietf.org; ospf-chairs@ietf.org; ospf@ietf.org
Subject: Re: Alvaro Retana's Discuss on draft-ietf-ospf-node-admin-tag-07: =
(with DISCUSS and COMMENT)

On 10/16/15, 5:20 AM, "Shraddha Hegde" <shraddha@juniper.net> wrote:

Shraddha:

Hi!

I'm just leaving in the still outstanding issues.

Thanks!

Alvaro.




. . .
>>For ex:  We have a statement administrative tag order has no meaning.
>>If this document does not specify such a statement, there I every=20
>>possibility some implementation will have policies that will look at=20
>>the order in which the tags are encoded. Some other implementation=20
>>which does not care about the order of the tag might keep changing it=20
>>at every LSA refresh so it's hard to get them to interoperate.
>
>This is a good point to talk about.  I understand the potential=20
>problems with re-origination/refresh -- one of them being that the=20
>document doesn't specify anything related to the ordering of the tags in t=
he TLV.
>In fact, the only text that I could find related to origination of the=20
>information is this:
>
>   When there is a change or removal of an administrative affiliation of
>   a node, the node MUST re-originate the RI LSA with the latest set of
>   node administrative tags.
>
>
>..it says nothing about how the set is ordered: random, chronological,=20
>some type of numeric order, etc.  While it might have been nice (for=20
>some
>applications) to have some type of predictability/persistence, not=20
>having an order is ok.  The text in 3.2 that reads:
>
><Shraddha> There is no need to specify the order. Implementations are=20
>free to pick any order since the receiver's actions are based on tag=20
>set and not on the order.
>I believe, this is clarified in section 3.2 in details.
>
>
>   The semantics of the tag order has no meaning.  That is, there is no
>   implied meaning to the ordering of the tags that indicates a certain
>   operation or set of operations that need to be performed based on the
>   ordering.
>
>
>...is also fine, and it (implicitly) covers the risk.
>
>The piece of text I have a problem with is this:
>
>   The administrative tag list within the TLV MUST be considered an=20
>unordered list.
>
>As you hinted above, because the draft doesn't provide guidance on=20
>ordering, an implementation can choose to do so without harming=20
>applications that assume nothing -- an operator may want to take=20
>advantage of this "ordering feature" (for whatever purpose), but this=20
>document would say "MUST be considered unordered"..limiting future=20
>policy implementations.
>
><Shraddha> As explained in the response above, I believe admin tags are=20
>generic enough to support a case when policy is to be based on order.

At the expense of complicating the policy definition, configuration, manage=
ment, etc..  Contrary to what you wrote in the Abstract: "This allows simpl=
ification, ease of management and control.."


I think we agree that order doesn't have to be specified.

What we're not in agreement on is the fact that if an implementation choose=
s to implement an order (as you said above "Implementations are free to pic=
k any order"), and provides policy constructs to act on the order (implemen=
tation-specific detail), then the operator can use those features to his/he=
r advantage regardless of what this document says.  IOW, "MUST be considere=
d an unordered list" doesn't reflect a reasonable expectation and can't rea=
lly be enforced.




>As with the discussion (in the other thread) about the potential=20
>definition of well-known values (change from "MUST NOT" to "not=20
>expected"), this is also a case where the use of normative (rfc2119)=20
>language makes no sense (at least to me).
>
><Shraddha> This is changed to "are not expected to" in the latest update.

The text in -08 still says:

   administrative tags.  The administrative tag list within the TLV MUST
   be considered an unordered list.  Whilst policies may be implemented
   based on the presence of multiple tags (e.g., if tag A AND tag B are
   present), they MUST NOT be reliant upon the order of the tags (i.e.,
   all policies should be considered commutative operations, such that
   tag A preceding or following tag B does not change their outcome).




>
>>Added below text in section 3.2.1
>>" This section describes general rules/ regulations and guidelines for=20
>>using and interpreting an administrative tag which will  facilitate=20
>>interoperable implementations by vendors."
>
>3.2, right?=20
>
><Shraddha> -08 version has section 3.2.1. Pls see attached.
>
>To hopefully speed the process up, let me be specific about the other
>rfc2119 occurrences in 3.2 that I have an issue with (in order of
>appearance):
>
>1. "Each tag MUST be treated as an independent identifier that MAY be=20
>used in policy to perform a policy action."
>
>Ben already mentioned that the "MAY" seems more descriptive than=20
>normative..  I agree.
>
><Shraddha> ok. Changing "MAY" to descriptive "may".
>
>However, there is still the "MUST".  All the tags are about a node, so=20
>they are in fact all related.  Also, because these are opaque tags, the=20
>operator can encode and interpret them anyway they want.  Again, the=20
>"MUST" makes no sense.
><Shraddha>changing it to must.
>
>2. "Tags carried by the administrative tag TLV SHOULD be used to=20
>indicate independent characteristics of a node."
>
>With this statement you're trying to limit what the operator can use=20
>the tags for.  Operationally this sentence is easy to ignore because=20
>there's no definition of what an "independent characteristic" is..so=20
>the use of "SHOULD" makes no sense.
><Shraddha>Changing to should
>
>
>3. "The administrative tag list within the TLV MUST be considered an=20
>unordered list.  Whilst policies may be implemented based on the=20
>presence of multiple tags (e.g., if tag A AND tag B are present), they=20
>MUST NOT be reliant upon the order of the tags (i.e., all policies=20
>should be considered commutative operations, such that tag A preceding=20
>or following tag B does not change their outcome)."
>
>Already discussed above.
>
>
>4. "To avoid incomplete or inconsistent interpretations of the per-node=20
>administrative tags the same tag value MUST NOT be advertised by a=20
>router in RI LSAs of different scopes."
>
>Why not?
>
>Given that all the tags are subject to local interpretation, it is very=20
>possible than an operator could use the same value to mean different=20
>things at the different scopes.
>
>[I know that we have 32 bits...but it is obviously easier for anyone to=20
>look at the TLV and remember what the value "5" means than to have to=20
>remember ranges between 34322-34332..or other numbers for the different=20
>scopes.]
>
><Shraddha> That's the exact point this statement is trying to make.=20
>There is no need to associate meaning based on flooding scope. If such=20
>a feature is needed operator can very well use different tags. I=20
>believe such rules help the vendors to define and implement local=20
>policies and operators to plan and work in a framework. Otherwise the=20
>policy rule space becomes huge and not all vendors will implement all of t=
hem.

Again, you're claiming an opaque space subject to local interpretation, but=
 then constraining how to use them..and not meeting the "simplification, ea=
se of management and control" claim.

>From section 2 (updated text): "The choice of what scope at which to flood =
the group tags is a matter of local policy."  And form the new 3.2.1: "The =
meaning of a per-node administrative tag is defined by the network local po=
licy and is controlled via the configuration."  Apparently not. :-(

BTW, I noticed that in -08 you also added:

   ... If a node
   administrative tag is received in different scopes, the conflicting
   tag SHOULD not be used and this situation SHOULD be logged as an
   error including the tag with conflicting scopes and the
   originator(s).


[I know this was put in to answer the SecDir review related to what should =
be done if the same value was received with different flooding scopes.]

Which is the "conflicting tag"?  Does it mean that for all scopes that spec=
ific value is not to be used?  If so, what about policies in which the oper=
ator is looking for two (or maybe more) tags to be present to take an actio=
n?  If all the tags for all scopes are declared conflicting then you may be=
 breaking more than one policy -- and depending on the expected action the =
disruption may be significant.

. . . =20
>6. "Being part of the RI LSA, the per-node administrative tag TLV must=20
>be reasonably small and stable...implementations supporting the=20
>per-node administrative tags MUST NOT tie advertised tags to changes in=20
>the network topology (both within and outside the OSPF domain) or=20
>reachability of routes."
>
>Again, why not?  I know the point is stability.  Just as an example,=20
>the application described in Section 4.4. (Mobile back-haul network=20
>service
>deployment) says that the tags could represent a ring..which will=20
>obviously change if the topology changes.
><Shraddha> Ring nodes are assigned tag values based on configuration=20
>and if one of the links breaks and the ring is no more a closed ring,=20
>the admin tag associated with the ring
>                       Nodes does not change. It changes only by=20
>changing the configuration on that node.
>                 =20
>
>In this case it is obviously ok to describe the potential impact of too=20
>many changes..but trying to control it with the "MUST NOT" is just=20
>something that can't be enforced.
>
><Shraddha> I believe normative language is necessary to enforce=20
>otherwise implementations will be free to say compliance to this=20
>document and not follow any of these suggestions. Many of the inter-op=20
>issues would be discovered only via testing which is expensive.

Suggestions shouldn't be normative.

The real problem is not whether the tags are configured to change when the =
topology does, the real problem is for the tags to change a lot and become =
unstable.  The only reason the tags will become unstable due to topology ch=
anges is if the topology is unstable itself.  However, there may be other r=
easons for tag instability.  For example, what it someone decides they want=
 a tag to reflect available bandwidth (or any other constantly changing par=
ameter)?

My point here is that it is ok for you to put in the suggestion about stabi=
lity.  It would be even better if you talked about rate limiting the origin=
ation of the TLVs with updated/changed tags (which is the stability you see=
m to want to enforce); you can even make that normative. However, you're tr=
ying (again) to limit potential applications that may not result in the sta=
bility problem that you're trying to prevent..and at the same time leaving =
the door open to other potential stability issues.

In short, if stability is your concern, then address it directly!


>=20
>7. "The node administrative tags associated with a node that originates=20
>tags for the purpose of any computation or processing at a receiving=20
>node SHOULD be a superset of node administrative tags from all the TLVs=20
>in all the received RI LSA instances originated by that node."
>
>Not a problem with this one either..but you're probably missing a "per=20
>flooding scope" somewhere.
><Shraddha > All RI LSA instances includes all flooding scopes.

This goes back to our conversation about scopes above.


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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Shraddha Hegde <shraddha@juniper.net>, "draft-ietf-ospf-two-part-metric@ietf.org" <draft-ietf-ospf-two-part-metric@ietf.org>
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From: "Alvaro Retana (aretana)" <aretana@cisco.com>
To: Shraddha Hegde <shraddha@juniper.net>, The IESG <iesg@ietf.org>
Thread-Topic: Alvaro Retana's Discuss on draft-ietf-ospf-node-admin-tag-07: (with DISCUSS and COMMENT)
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Subject: Re: [OSPF] Alvaro Retana's Discuss on draft-ietf-ospf-node-admin-tag-07: (with DISCUSS and COMMENT)
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On 10/18/15, 11:53 PM, "Shraddha Hegde" <shraddha@juniper.net> wrote:

Shraddha:


Hi!

I'm either completely missing the point, not explaining myself correctly,
or both.  We seem to be going around in circles.. :-(

I'm going to clear the DISCUSS.. I trust the responsible AD and hope that
the WG had the appropriate discussions.  There are still some comments
below.

Alvaro.

. . .
>
>From section 2 (updated text): "The choice of what scope at which to
>flood the group tags is a matter of local policy."  And form the new
>3.2.1: "The meaning of a per-node administrative tag is defined by the
>network local policy and is controlled via the configuration."
>Apparently not. :-(
>
>BTW, I noticed that in -08 you also added:
>
>   ... If a node
>   administrative tag is received in different scopes, the conflicting
>   tag SHOULD not be used and this situation SHOULD be logged as an
>   error including the tag with conflicting scopes and the
>   originator(s).
>
>
>[I know this was put in to answer the SecDir review related to what
>should be done if the same value was received with different flooding
>scopes.]
>
>Which is the "conflicting tag"?  Does it mean that for all scopes that
>specific value is not to be used?
>From section 2 (updated text): "The choice of what scope at which to
>flood the group tags is a matter of local policy."  And form the new
>3.2.1: "The meaning of a per-node administrative tag is defined by the
>network local policy and is controlled via the configuration."
>Apparently not. :-(
>
>BTW, I noticed that in -08 you also added:
>
>   ... If a node
>   administrative tag is received in different scopes, the conflicting
>   tag SHOULD not be used and this situation SHOULD be logged as an
>   error including the tag with conflicting scopes and the
>   originator(s).
>
>
>[I know this was put in to answer the SecDir review related to what
>should be done if the same value was received with different flooding
>scopes.]
>
>Which is the "conflicting tag"?  Does it mean that for all scopes that
>specific value is not to be used?
>
><Shraddha> Tags are associated with nodes which advertise them. There is
>no need to associate tags with scopes for any policy action. If an
>operator has any such usecase new tags can be associated with such a
>use-case.
>
>
>If so, what about policies in which the operator is looking for two (or
>maybe more) tags to be present to take an action?
>
><Shraddha> The issue being described here is about same tag appearing in
>different scopes on a non-ABR. It's perfectly valid to associate multiple
>tags with a node.

If the same tag value is flooded with multiple scopes, then it will be
declared conflicting (for all scopes).  If there are policies that are
dependent on those tags then they won't be applied -- including policies
that rely on more than one tag being present (including the one declared
conflicting, of course).  The point of that question was to point out that
by invalidating a tag the policies that will be applied won't always
depend just on the remaining tags..

Your answer is: the operator can change their policies..

We're now going in circles..


>=20
>If all the tags for all scopes are declared conflicting then you may be
>breaking more than one policy -- and depending on the expected action the
>disruption may be significant
>
>--------------------------------------------------------------------------
>-----------------------------------------------------------------------
>
>The real problem is not whether the tags are configured to change when
>the topology does, the real problem is for the tags to change a lot and
>become unstable.  The only reason the tags will become unstable due to
>topology changes is if the topology is unstable itself.  However, there
>may be other reasons for tag instability.  For example, what it someone
>decides they want a tag to reflect available bandwidth (or any other
>constantly changing parameter)?
>
>My point here is that it is ok for you to put in the suggestion about
>stability.  It would be even better if you talked about rate limiting the
>origination of the TLVs with updated/changed tags (which is the stability
>you seem to want to enforce); you can even make that normative. However,
>you're trying (again) to limit potential applications that may not result
>in the stability problem that you're trying to prevent..and at the same
>time leaving the door open to other potential stability issues.
>
>In short, if stability is your concern, then address it directly!
>
><Shraddha> The paragraph begins with below statement.
>
>"Being part of the RI LSA, the per-node administrative tag
>TLV must be reasonably small and stable."
>
>I think that should address the stability problems.

It should.  This is the text I quoted originally:

"Being part of the RI LSA, the per-node administrative tag TLV must be
reasonably small and stable...implementations supporting the per-node
administrative tags MUST NOT tie advertised tags to changes in the
network topology (both within and outside the OSPF domain) or
reachability of routes."


Again, the point was that by not allowing the tags to be tied to changes
in topology you are not necessarily doing much to limit instability.
True, the topology may become unstable and the tags advertised will mirror
that -- the root cause being the topology instability.  But I think there
can be valid applications that could follow topology changes that won't
mirror instability (if the network itself is stable).  Also, you focused
on one thing (topology instability), leaving other reasons for tag
instability without mention -- this last part was why I suggested that you
might want to focus on the problem you really want to resolve and maybe
talk about rate limiting.


From nobody Mon Oct 19 05:42:05 2015
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Subject: [OSPF] Alvaro Retana's No Objection on draft-ietf-ospf-node-admin-tag-08: (with COMMENT)
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Alvaro Retana has entered the following ballot position for
draft-ietf-ospf-node-admin-tag-08: No Objection

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Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html
for more information about IESG DISCUSS and COMMENT positions.


The document, along with other ballot positions, can be found here:
https://datatracker.ietf.org/doc/draft-ietf-ospf-node-admin-tag/



----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

I am clearing my DISCUSS because we seem to be going around in circles in
my exchanges with the authors.

I still have some concerns about the normative language in section 3.2
(some of it has been updated as a result of our discussions) â€” I think
that some of the text is not in line with what seems to be the intent of
the extension: "â€¦allows simplification, ease of management and control
overâ€¦policies. â€¦node-tags can be used to express and apply
locally-defined network policies."

Specifically, I have strong concerns about the ability (or not, as
defined in the text) to flood the same tag value with different scopes,
and about potential instability caused by sources other than topology
changes.

To all this, I trust the responsible AD and hope that the WG had the
appropriate discussions, so I'm changing my ballot and not standing in
the way.



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From nobody Mon Oct 19 14:02:38 2015
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Cc: draft-ietf-ospf-rfc4970bis@ietf.org, ospf@ietf.org, The IESG <iesg@ietf.org>, ospf-chairs@ietf.org, rfc-editor@rfc-editor.org
Subject: [OSPF] Protocol Action: 'Extensions to OSPF for Advertising Optional Router Capabilities' to Proposed Standard (draft-ietf-ospf-rfc4970bis-07.txt)
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The IESG has approved the following document:
- 'Extensions to OSPF for Advertising Optional Router Capabilities'
  (draft-ietf-ospf-rfc4970bis-07.txt) as Proposed Standard

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

The IESG contact persons are Alvaro Retana, Alia Atlas and Deborah
Brungard.

A URL of this Internet Draft is:
https://datatracker.ietf.org/doc/draft-ietf-ospf-rfc4970bis/





Technical Summary

   This document describes both a generic mechanism for advertising
   router capabilities and a TLV for advertising informational and
   functional capability bits. 

   This document obsoletes RFC 4970 by providing a revised specification
   including support for advertisement of multiple instances of the RI
   LSA and a TLV for functional capabilities.

Working Group Summary

   This document has been a WG document for more than six months.
   It is stable, without changes to the technical solution for more
   than six months.  


From nobody Mon Oct 19 14:30:17 2015
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From nobody Mon Oct 19 15:42:50 2015
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Subject: Re: [OSPF] OSPF Operator-Defined TLVs (https://www.ietf.org/id/draft-chunduri-ospf-operator-defined-tlvs-01.txt)
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From: Shraddha Hegde <shraddha@juniper.net>
To: "Alvaro Retana (aretana)" <aretana@cisco.com>, The IESG <iesg@ietf.org>
Thread-Topic: Alvaro Retana's Discuss on draft-ietf-ospf-node-admin-tag-07: (with DISCUSS and COMMENT)
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Cc: "draft-ietf-ospf-node-admin-tag.ad@ietf.org" <draft-ietf-ospf-node-admin-tag.ad@ietf.org>, "ospf@ietf.org" <ospf@ietf.org>, "draft-ietf-ospf-node-admin-tag.shepherd@ietf.org" <draft-ietf-ospf-node-admin-tag.shepherd@ietf.org>, "draft-ietf-ospf-node-admin-tag@ietf.org" <draft-ietf-ospf-node-admin-tag@ietf.org>, "ospf-chairs@ietf.org" <ospf-chairs@ietf.org>
Subject: Re: [OSPF] Alvaro Retana's Discuss on draft-ietf-ospf-node-admin-tag-07: (with DISCUSS and COMMENT)
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Alvaro,

I'll try to clarify based on my understanding of your comments.

If the same tag value is flooded with multiple scopes, then it will be decl=
ared conflicting (for all scopes).
<Shraddha>Yes.
.
  If there are policies that are dependent on those tags then they won't be=
 applied
<Shraddha> The conflicting tag won't be considered. Lets say a node had adv=
ertised 10 tags. Lets say 10th tag is conflicting and is arriving
                       In different scopes. Only 9 tags will be sent to pol=
icy.=20
                       If you saying just because one tag is conflicting th=
e whole set of tags for that node is ignored, then that's not the case.

 -- including policies that rely on more than one tag being present (includ=
ing the one declared conflicting, of course).  The point of that question w=
as to point out that by invalidating a tag the policies that will be applie=
d won't always depend just on the remaining tags..

<Shraddha> Again I don't understand your statement. Why can't the policy be=
 applied on only 9 tags in above example. If the policy fails because of th=
e absence of 10th flag then it's an issue with the advertising router being=
 nod-ABR and having advertised different tags in different scopes.

Do you mean to say we should not restrict same tag being advertised in diff=
erent scopes?
I am not sure If we can change that at this stage of the document since WG =
as well as others who reviewed the document so far are OK with that restric=
tion being there.

---------------------------------------------------------------------------=
--------------------------------------------------------------

Again, the point was that by not allowing the tags to be tied to changes in=
 topology you are not necessarily doing much to limit instability.
True, the topology may become unstable and the tags advertised will mirror =
that -- the root cause being the topology instability.  But I think there c=
an be valid applications that could follow topology changes that won't mirr=
or instability (if the network itself is stable).  Also, you focused on one=
 thing (topology instability), leaving other reasons for tag instability wi=
thout mention -- this last part was why I suggested that you might want to =
focus on the problem you really want to resolve and maybe talk about rate l=
imiting.

<Shraddha> Personally, I do not think we need to talk about rate limiting o=
f node-admin tags since we already have rate limiting for the LSA originati=
on.
Would like to hear others opinion on this.

Rgds
Shraddha

-----Original Message-----
From: Alvaro Retana (aretana) [mailto:aretana@cisco.com]=20
Sent: Monday, October 19, 2015 6:09 PM
To: Shraddha Hegde <shraddha@juniper.net>; The IESG <iesg@ietf.org>
Cc: Acee Lindem (acee) <acee@cisco.com>; draft-ietf-ospf-node-admin-tag.ad@=
ietf.org; draft-ietf-ospf-node-admin-tag.shepherd@ietf.org; draft-ietf-ospf=
-node-admin-tag@ietf.org; ospf-chairs@ietf.org; ospf@ietf.org
Subject: Re: Alvaro Retana's Discuss on draft-ietf-ospf-node-admin-tag-07: =
(with DISCUSS and COMMENT)

On 10/18/15, 11:53 PM, "Shraddha Hegde" <shraddha@juniper.net> wrote:

Shraddha:


Hi!

I'm either completely missing the point, not explaining myself correctly, o=
r both.  We seem to be going around in circles.. :-(

I'm going to clear the DISCUSS.. I trust the responsible AD and hope that t=
he WG had the appropriate discussions.  There are still some comments below=
.

Alvaro.

. . .
>
>From section 2 (updated text): "The choice of what scope at which to=20
>flood the group tags is a matter of local policy."  And form the new
>3.2.1: "The meaning of a per-node administrative tag is defined by the=20
>network local policy and is controlled via the configuration."
>Apparently not. :-(
>
>BTW, I noticed that in -08 you also added:
>
>   ... If a node
>   administrative tag is received in different scopes, the conflicting
>   tag SHOULD not be used and this situation SHOULD be logged as an
>   error including the tag with conflicting scopes and the
>   originator(s).
>
>
>[I know this was put in to answer the SecDir review related to what=20
>should be done if the same value was received with different flooding=20
>scopes.]
>
>Which is the "conflicting tag"?  Does it mean that for all scopes that=20
>specific value is not to be used?
>From section 2 (updated text): "The choice of what scope at which to=20
>flood the group tags is a matter of local policy."  And form the new
>3.2.1: "The meaning of a per-node administrative tag is defined by the=20
>network local policy and is controlled via the configuration."
>Apparently not. :-(
>
>BTW, I noticed that in -08 you also added:
>
>   ... If a node
>   administrative tag is received in different scopes, the conflicting
>   tag SHOULD not be used and this situation SHOULD be logged as an
>   error including the tag with conflicting scopes and the
>   originator(s).
>
>
>[I know this was put in to answer the SecDir review related to what=20
>should be done if the same value was received with different flooding=20
>scopes.]
>
>Which is the "conflicting tag"?  Does it mean that for all scopes that=20
>specific value is not to be used?
>
><Shraddha> Tags are associated with nodes which advertise them. There=20
>is no need to associate tags with scopes for any policy action. If an=20
>operator has any such usecase new tags can be associated with such a=20
>use-case.
>
>
>If so, what about policies in which the operator is looking for two (or=20
>maybe more) tags to be present to take an action?
>
><Shraddha> The issue being described here is about same tag appearing=20
>in different scopes on a non-ABR. It's perfectly valid to associate=20
>multiple tags with a node.

If the same tag value is flooded with multiple scopes, then it will be decl=
ared conflicting (for all scopes).  If there are policies that are dependen=
t on those tags then they won't be applied -- including policies that rely =
on more than one tag being present (including the one declared conflicting,=
 of course).  The point of that question was to point out that by invalidat=
ing a tag the policies that will be applied won't always depend just on the=
 remaining tags..

Your answer is: the operator can change their policies..

We're now going in circles..


>=20
>If all the tags for all scopes are declared conflicting then you may be=20
>breaking more than one policy -- and depending on the expected action=20
>the disruption may be significant
>
>-----------------------------------------------------------------------
>---
>-----------------------------------------------------------------------
>
>The real problem is not whether the tags are configured to change when=20
>the topology does, the real problem is for the tags to change a lot and=20
>become unstable.  The only reason the tags will become unstable due to=20
>topology changes is if the topology is unstable itself.  However, there=20
>may be other reasons for tag instability.  For example, what it someone=20
>decides they want a tag to reflect available bandwidth (or any other=20
>constantly changing parameter)?
>
>My point here is that it is ok for you to put in the suggestion about=20
>stability.  It would be even better if you talked about rate limiting=20
>the origination of the TLVs with updated/changed tags (which is the=20
>stability you seem to want to enforce); you can even make that=20
>normative. However, you're trying (again) to limit potential=20
>applications that may not result in the stability problem that you're=20
>trying to prevent..and at the same time leaving the door open to other pot=
ential stability issues.
>
>In short, if stability is your concern, then address it directly!
>
><Shraddha> The paragraph begins with below statement.
>
>"Being part of the RI LSA, the per-node administrative tag TLV must be=20
>reasonably small and stable."
>
>I think that should address the stability problems.

It should.  This is the text I quoted originally:

"Being part of the RI LSA, the per-node administrative tag TLV must be reas=
onably small and stable...implementations supporting the per-node administr=
ative tags MUST NOT tie advertised tags to changes in the network topology =
(both within and outside the OSPF domain) or reachability of routes."


Again, the point was that by not allowing the tags to be tied to changes in=
 topology you are not necessarily doing much to limit instability.
True, the topology may become unstable and the tags advertised will mirror =
that -- the root cause being the topology instability.  But I think there c=
an be valid applications that could follow topology changes that won't mirr=
or instability (if the network itself is stable).  Also, you focused on one=
 thing (topology instability), leaving other reasons for tag instability wi=
thout mention -- this last part was why I suggested that you might want to =
focus on the problem you really want to resolve and maybe talk about rate l=
imiting.


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From: Shraddha Hegde <shraddha@juniper.net>
To: Shraddha Hegde <shraddha@juniper.net>, "Alvaro Retana (aretana)" <aretana@cisco.com>, The IESG <iesg@ietf.org>
Thread-Topic: Alvaro Retana's Discuss on draft-ietf-ospf-node-admin-tag-07: (with DISCUSS and COMMENT)
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Date: Tue, 20 Oct 2015 04:04:07 +0000
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Cc: "draft-ietf-ospf-node-admin-tag.ad@ietf.org" <draft-ietf-ospf-node-admin-tag.ad@ietf.org>, "ospf@ietf.org" <ospf@ietf.org>, "draft-ietf-ospf-node-admin-tag.shepherd@ietf.org" <draft-ietf-ospf-node-admin-tag.shepherd@ietf.org>, "draft-ietf-ospf-node-admin-tag@ietf.org" <draft-ietf-ospf-node-admin-tag@ietf.org>, "ospf-chairs@ietf.org" <ospf-chairs@ietf.org>
Subject: Re: [OSPF] Alvaro Retana's Discuss on draft-ietf-ospf-node-admin-tag-07: (with DISCUSS and COMMENT)
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Resending the mail as the previous mail content got removed.

Alvaro,

  Thanks for the discussion.
I am sorry that we are not able to reach conclusion quickly.

Nevertheless,I'll try to clarify based on my understanding of your comments=
.

If the same tag value is flooded with multiple scopes, then it will be decl=
ared conflicting (for all scopes).
<Shraddha>Yes.
.
  If there are policies that are dependent on those tags then they won't be=
 applied

 <Shraddha> The conflicting tag won't be considered. Lets say a node had ad=
vertised 10 tags. Lets say 10th tag is conflicting and is arriving
                       In different scopes. Only 9 tags will be sent to pol=
icy.=20
                       If you saying just because one tag is conflicting th=
e whole set of tags for that node is ignored, then that's not the case.

 -- including policies that rely on more than one tag being present (includ=
ing the one declared conflicting, of course).  The point of that question w=
as to point out that by invalidating a tag the policies that will be applie=
d won't always depend just on the remaining tags..

<Shraddha> Again I don't understand your statement. Why can't the policy be=
 applied on only 9 tags in above example. If the policy fails because of th=
e absence of 10th flag then it's an issue with the advertising router being=
 nod-ABR and having advertised different tags in different scopes.

Do you mean to say we should not restrict same tag being advertised in diff=
erent scopes?
I am not sure If we can change that at this stage of the document since WG =
as well as others who reviewed the document so far are OK with that restric=
tion being there.

---------------------------------------------------------------------------=
--------------------------------------------------------------

Again, the point was that by not allowing the tags to be tied to changes in=
 topology you are not necessarily doing much to limit instability.
True, the topology may become unstable and the tags advertised will mirror =
that -- the root cause being the topology instability.  But I think there c=
an be valid applications that could follow topology changes that won't mirr=
or instability (if the network itself is stable).  Also, you focused on one=
 thing (topology instability), leaving other reasons for tag instability wi=
thout mention -- this last part was why I suggested that you might want to =
focus on the problem you really want to resolve and maybe talk about rate l=
imiting.

<Shraddha> Personally, I do not think we need to talk about rate limiting o=
f node-admin tags since we already have rate limiting for the LSA originati=
on.
Would like to hear others opinion on this.

Rgds
Shraddha

-----Original Message-----
From: Shraddha Hegde [mailto:shraddha@juniper.net]=20
Sent: Tuesday, October 20, 2015 9:27 AM
To: Alvaro Retana (aretana) <aretana@cisco.com>; The IESG <iesg@ietf.org>
Cc: Acee Lindem (acee) <acee@cisco.com>; draft-ietf-ospf-node-admin-tag.ad@=
ietf.org; draft-ietf-ospf-node-admin-tag.shepherd@ietf.org; draft-ietf-ospf=
-node-admin-tag@ietf.org; ospf-chairs@ietf.org; ospf@ietf.org
Subject: RE: Alvaro Retana's Discuss on draft-ietf-ospf-node-admin-tag-07: =
(with DISCUSS and COMMENT)

Alvaro,

I'll try to clarify based on my understanding of your comments.

If the same tag value is flooded with multiple scopes, then it will be decl=
ared conflicting (for all scopes).
<Shraddha>Yes.


From nobody Mon Oct 19 21:36:16 2015
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From: Shraddha Hegde <shraddha@juniper.net>
To: "Acee Lindem (acee)" <acee@cisco.com>, "draft-ietf-ospf-two-part-metric@ietf.org" <draft-ietf-ospf-two-part-metric@ietf.org>
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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Shraddha Hegde <shraddha@juniper.net>, "draft-ietf-ospf-two-part-metric@ietf.org" <draft-ietf-ospf-two-part-metric@ietf.org>
Thread-Topic: draft-ietf-ospf-two-part-metric : Max metric handling
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From: Shraddha Hegde <shraddha@juniper.net>
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Subject: [OSPF] Regarding draft-ppsenak-ospf-te-link-attr-reuse-00
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Hi All,


draft-ppsenak-ospf-te-link-attr-reuse-00 proposes moving and/or copying TLV=
s from the TE Opaque LSA to the Extended Link Opaque LSA. The draft lists t=
he problems that the draft is trying to solve.  I have reproduced that list=
 of problems below, with each problem followed by what I believe to be a be=
tter and simpler solution.

   1.  Whenever the link is advertised in a TE Opaque LSA, the link
       becomes a part of the TE topology, which may not match IP routed
       topology.  By making the link part of the TE topology, remote
       nodes may mistakenly believe that the link is available for MPLS
       TE or GMPLS, when, in fact, MPLS is not enabled on the link.

To address this issue, we simply need to define a new sub-TLV in the TE Lin=
k LSA  to say whether MPLS/GMPLS/RSVP is enabled on the link instead of mov=
ing the TLVs around into different LSAs.

   2.  The TE Opaque LSA carries link attributes that are not used or
       required by MPLS TE or GMPLS.  There is no mechanism in TE Opaque
       LSA to indicate which of the link attributes should be passed to
       MPLS TE application and which should be used by OSPFv2 and other
       applications.

OSPF database is a container and OSPF can use any of the LSAS for its own u=
se including the TE LSAs.  As far as the TE database goes, it contains data=
 from TE LSAs as well as non-TE LSAs (Network LSA) today so the reasoning d=
escribed here doesn't make sense.

   3.  Link attributes used for non-TE purposes is partitioned across
       multiple LSAs - the TE Opaque LSA and the Extended Link Opaque
       LSA.  This partitioning will require implementations to lookup
       multiple LSAs to extract link attributes for a single link,
       bringing needless complexity to the OSPFv2 implementations.

There will be nodes in the network which will run older software which send=
 these attributes via TE LSAs so the problem of looking into the TE LSAs fo=
r TE related information doesn't get solved with this draft.  Rather it mak=
es it more complicated. With this draft, the multiple LSA lookup will only =
increase.  An implementation will first have to find if Extended link LSA c=
ontains the required info,  if not it will need to look up the info in TE.L=
SA.

Looking up multiple LSAs for information is an implementation issue and I a=
m sure there will be implementations that will handle this  gracefully so t=
hat it doesn't cause
delays in critical paths. It doesn't seem reasonable to come up with protoc=
ol extensions to solve implementation issues.


Rgds
Shraddha






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<font face=3D"Calibri" size=3D"2"><span style=3D"font-size:11pt;">
<div>Hi All,</div>
<div>&nbsp;</div>
<div>&nbsp;</div>
<div>draft-ppsenak-ospf-te-link-attr-reuse-00 proposes moving and/or copyin=
g TLVs from the TE Opaque LSA to the Extended Link Opaque LSA. The draft li=
sts the problems that the draft is trying to solve.&nbsp; I have reproduced=
 that list of problems below, with each
problem followed by what I believe to be a better and simpler solution. </d=
iv>
<div><font color=3D"#1F497D">&nbsp;</font></div>
<div><font face=3D"Courier New" size=3D"2"><span style=3D"font-size:10pt;">=
&nbsp;&nbsp; 1.&nbsp; Whenever the link is advertised in a TE Opaque LSA, t=
he link</span></font></div>
<div><font face=3D"Courier New" size=3D"2"><span style=3D"font-size:10pt;">=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; becomes a part of the TE topology, whi=
ch may not match IP routed</span></font></div>
<div><font face=3D"Courier New" size=3D"2"><span style=3D"font-size:10pt;">=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; topology.&nbsp; By making the link par=
t of the TE topology, remote</span></font></div>
<div><font face=3D"Courier New" size=3D"2"><span style=3D"font-size:10pt;">=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; nodes may mistakenly believe that the =
link is available for MPLS</span></font></div>
<div><font face=3D"Courier New" size=3D"2"><span style=3D"font-size:10pt;">=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; TE or GMPLS, when, in fact, MPLS is no=
t enabled on the link.</span></font></div>
<div>&nbsp;</div>
<div>To address this issue, we simply need to define a new sub-TLV in the T=
E Link LSA<font color=3D"#1F497D"> </font> to say whether MPLS/GMPLS/RSVP i=
s enabled on the link instead of moving the TLVs around into different LSAs=
.</div>
<div>&nbsp;</div>
<div><font face=3D"Courier New" size=3D"2"><span style=3D"font-size:10pt;">=
&nbsp;&nbsp; 2.&nbsp; The TE Opaque LSA carries link attributes that are no=
t used or</span></font></div>
<div><font face=3D"Courier New" size=3D"2"><span style=3D"font-size:10pt;">=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; required by MPLS TE or GMPLS.&nbsp; Th=
ere is no mechanism in TE Opaque</span></font></div>
<div><font face=3D"Courier New" size=3D"2"><span style=3D"font-size:10pt;">=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; LSA to indicate which of the link attr=
ibutes should be passed to</span></font></div>
<div><font face=3D"Courier New" size=3D"2"><span style=3D"font-size:10pt;">=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; MPLS TE application and which should b=
e used by OSPFv2 and other</span></font></div>
<div><font face=3D"Courier New" size=3D"2"><span style=3D"font-size:10pt;">=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; applications.</span></font></div>
<div><font face=3D"Courier New" size=3D"2"><span style=3D"font-size:10pt;">=
&nbsp;</span></font></div>
<div>OSPF database is a container and OSPF can use any of the LSAS for its =
own use including the TE LSAs.<font color=3D"#1F497D">&nbsp; </font>As far =
as the TE database goes, it contains data from TE LSAs as well as non-TE LS=
As (Network LSA) today so the<font color=3D"#1F497D">
r</font>easoning described here doesn&#8217;t make sense.</div>
<div>&nbsp;</div>
<div><font face=3D"Courier New" size=3D"2"><span style=3D"font-size:10pt;">=
&nbsp;&nbsp; 3.&nbsp; Link attributes used for non-TE purposes is partition=
ed across</span></font></div>
<div><font face=3D"Courier New" size=3D"2"><span style=3D"font-size:10pt;">=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; multiple LSAs - the TE Opaque LSA and =
the Extended Link Opaque</span></font></div>
<div><font face=3D"Courier New" size=3D"2"><span style=3D"font-size:10pt;">=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; LSA.&nbsp; This partitioning will requ=
ire implementations to lookup</span></font></div>
<div><font face=3D"Courier New" size=3D"2"><span style=3D"font-size:10pt;">=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; multiple LSAs to extract link attribut=
es for a single link,</span></font></div>
<div><font face=3D"Courier New" size=3D"2"><span style=3D"font-size:10pt;">=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; bringing needless complexity to the OS=
PFv2 implementations.</span></font></div>
<div><font face=3D"Courier New" size=3D"2"><span style=3D"font-size:10pt;">=
&nbsp;</span></font></div>
<div>There will be nodes in the network which will run older software which=
 send these attributes <font color=3D"#1F497D">v</font>ia TE LSAs so the pr=
oblem of looking into the TE LSAs for TE related<font color=3D"#1F497D"> </=
font>information doesn&#8217;t get solved
with this draft.&nbsp; Rather it makes it more complicated. With this draft=
, the multiple LSA lookup will only increase.<font color=3D"#1F497D">&nbsp;=
 </font>An implementation will first have to find if Extended link LSA cont=
ains the required info<font color=3D"#1F497D">,
</font> if not it will need to look<font color=3D"#1F497D"> </font>up the i=
nfo in TE.LSA.</div>
<div>&nbsp;</div>
<div>Looking up multiple LSAs for information is an implementation issue an=
d I am sure there will be implementations that will handle this&nbsp; grace=
fully so that it doesn&#8217;t cause</div>
<div>delays in critical paths. It doesn&#8217;t seem reasonable to come up =
with protocol extensions to solve implementation issues.</div>
<div>&nbsp;</div>
<div>&nbsp;</div>
<div>Rgds</div>
<div>Shraddha</div>
<div>&nbsp;</div>
<div><font color=3D"#1F497D">&nbsp;</font></div>
<div>&nbsp;</div>
<div>&nbsp;</div>
<div>&nbsp;</div>
</span></font>
</body>
</html>

--_000_CY1PR0501MB1385753D145646F8A8542954D5380CY1PR0501MB1385_--


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Date: Wed, 21 Oct 2015 10:53:15 +0200
From: Peter Psenak <ppsenak@cisco.com>
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Subject: Re: [OSPF] Regarding draft-ppsenak-ospf-te-link-attr-reuse-00
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Shraddha,

On 10/21/15 07:20 , Shraddha Hegde wrote:
> Hi All,
> draft-ppsenak-ospf-te-link-attr-reuse-00 proposes moving and/or copying
> TLVs from the TE Opaque LSA to the Extended Link Opaque LSA. The draft
> lists the problems that the draft is trying to solve.  I have reproduced
> that list of problems below, with each problem followed by what I
> believe to be a better and simpler solution.
>     1.  Whenever the link is advertised in a TE Opaque LSA, the link
>         becomes a part of the TE topology, which may not match IP routed
>         topology.  By making the link part of the TE topology, remote
>         nodes may mistakenly believe that the link is available for MPLS
>         TE or GMPLS, when, in fact, MPLS is not enabled on the link.
> To address this issue, we simply need to define a new sub-TLV in the TE
> Link LSAto say whether MPLS/GMPLS/RSVP is enabled on the link instead of
> moving the TLVs around into different LSAs.

let me disagree.

RFC3630 defined TE Opaque LSAs as a  "way of describing the traffic 
engineering topology". What you are proposing is to define a TLV that 
would do exactly opposite and remove link from traffic engineering 
topology. That is a bad idea IMHO.

We have defined Extended Link LSA to advertise link attributes, which is 
independent of the traffic engineering. Using Extended Link LSA to 
advertise link attributes that are NOT related to TE is much cleaner way 
of doing things.

Also we are not moving any of the existing TE/GMPLS/RSVP TLVs anywhere, 
they will still use the TE Opaque LSA.


>     2.  The TE Opaque LSA carries link attributes that are not used or
>         required by MPLS TE or GMPLS.  There is no mechanism in TE Opaque
>         LSA to indicate which of the link attributes should be passed to
>         MPLS TE application and which should be used by OSPFv2 and other
>         applications.
> OSPF database is a container and OSPF can use any of the LSAS for its
> own use including the TE LSAs.As far as the TE database goes, it
> contains data from TE LSAs as well as non-TE LSAs (Network LSA) today so
> thereasoning described here doesn’t make sense.

Network LSA does not carry any link attributes.

The point is that if you start to use TE Opaque LSA for advertising 
attributes that are not to be used by TE they will be sent to TE as 
well, which is not what we want.


>     3.  Link attributes used for non-TE purposes is partitioned across
>         multiple LSAs - the TE Opaque LSA and the Extended Link Opaque
>         LSA.  This partitioning will require implementations to lookup
>         multiple LSAs to extract link attributes for a single link,
>         bringing needless complexity to the OSPFv2 implementations.
> There will be nodes in the network which will run older software which
> send these attributes via TE LSAs so the problem of looking into the TE
> LSAs for TE relatedinformation doesn’t get solved with this draft.

We are not proposing to modify what we do with TE Opaque LSA in any way.

What we propose is that if some link attributes are used outside of TE, 
advertise them in Extended Link LSA. There is no issue with older 
software at all.


> Rather it makes it more complicated. With this draft, the multiple LSA
> lookup will only increase.An implementation will first have to find if
> Extended link LSA contains the required info, if not it will need to
> lookup the info in TE.LSA.

no. TE will only look at TE Opaque LSA as before.

Extended link LSA will be used internally by OSPF for things like FRR, etc.

> Looking up multiple LSAs for information is an implementation issue and
> I am sure there will be implementations that will handle this
> gracefully so that it doesn’t cause
> delays in critical paths. It doesn’t seem reasonable to come up with
> protocol extensions to solve implementation issues.

we are not trying to solve implementation problem. We are trying to not 
break the existing TE functionality by reusing TE Opaque LSA for 
something it has not been defined for.

thanks,
Peter


> Rgds
> Shraddha
>
>
> _______________________________________________
> OSPF mailing list
> OSPF@ietf.org
> https://www.ietf.org/mailman/listinfo/ospf
>


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From: Chris Bowers <cbowers@juniper.net>
To: "Acee Lindem (acee)" <acee@cisco.com>, Shraddha Hegde <shraddha@juniper.net>, OSPF WG List <ospf@ietf.org>
Thread-Topic: [OSPF] Regarding draft-ppsenak-ospf-te-link-attr-reuse-00
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Subject: Re: [OSPF] Regarding draft-ppsenak-ospf-te-link-attr-reuse-00
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From nobody Wed Oct 21 10:40:17 2015
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Date: Wed, 21 Oct 2015 19:40:06 +0200
From: Peter Psenak <ppsenak@cisco.com>
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To: Chris Bowers <cbowers@juniper.net>, "Acee Lindem (acee)" <acee@cisco.com>,  Shraddha Hegde <shraddha@juniper.net>, OSPF WG List <ospf@ietf.org>
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Subject: Re: [OSPF] Regarding draft-ppsenak-ospf-te-link-attr-reuse-00
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Hi Chris,

On 10/21/15 19:20 , Chris Bowers wrote:
> In my opinion the backwards compatibility problems introduced by this
> proposal outweigh potential gains.

there is no backwards compatibility problem with the draft.

>
> As a concrete example, there is at least one existing implementation of
> remote LFA where policy is used to select a backup tunnel that does not
> share an SRLG with the failed link.  This SRLG information is carried in
> the TE Opaque LSA.

that is fine, you are free to do that if the link is TE enabled, there 
is no problem. If the link is not TE enabled and you use TE Opaque LSA 
to flood the SRLG data for such link, you are going against the current 
specification. There is no way to do that today, because any router that 
would receive such TE Opaque LSA must assume such link is TE enabled.

>
> As it currently reads, I think the proposal in
>   draft-ppsenak-ospf-te-link-attr-reuse has the potential to break
> existing standards-compliant implementations.

I don't believe so.

>
> I might be OK with having the proposal only apply to sub-TLVs  that get
> defined in the future.  However, I think that taking TLVs that were
>   standardized over ten years ago, and selectively moving them or
> copying them to a different LSA based on a set of rules that is subject
> to interpretation is going to create confusion and interoperability
> headaches.

What we propose is the way to advertise link attributes without making 
the link part of TE topology. We simply do not have a way to do that 
today. I do not see any problem in doing so, because we do not change 
anything on the TE Opaque LSA side, we are defining something new.

thanks,
Peter

>
> Chris
>
> *From:*OSPF [mailto:ospf-bounces@ietf.org] *On Behalf Of *Acee Lindem (acee)
> *Sent:* Wednesday, October 21, 2015 6:48 AM
> *To:* Shraddha Hegde <shraddha@juniper.net>; OSPF WG List <ospf@ietf.org>
> *Subject:* Re: [OSPF] Regarding draft-ppsenak-ospf-te-link-attr-reuse-00
>
> Hi Shraddha,
>
> *From: *OSPF <ospf-bounces@ietf.org <mailto:ospf-bounces@ietf.org>> on
> behalf of Shraddha Hegde <shraddha@juniper.net
> <mailto:shraddha@juniper.net>>
> *Date: *Wednesday, October 21, 2015 at 1:20 AM
> *To: *OSPF WG List <ospf@ietf.org <mailto:ospf@ietf.org>>
> *Subject: *[OSPF] Regarding draft-ppsenak-ospf-te-link-attr-reuse-00
>
>     Hi All,
>
>     draft-ppsenak-ospf-te-link-attr-reuse-00 proposes moving and/or
>     copying TLVs from the TE Opaque LSA to the Extended Link Opaque LSA.
>     The draft lists the problems that the draft is trying to solve.  I
>     have reproduced that list of problems below, with each problem
>     followed by what I believe to be a better and simpler solution.
>
>         1.  Whenever the link is advertised in a TE Opaque LSA, the link
>
>             becomes a part of the TE topology, which may not match IP routed
>
>             topology.  By making the link part of the TE topology, remote
>
>             nodes may mistakenly believe that the link is available for MPLS
>
>             TE or GMPLS, when, in fact, MPLS is not enabled on the link.
>
>     To address this issue, we simply need to define a new sub-TLV in the
>     TE Link LSAto say whether MPLS/GMPLS/RSVP is enabled on the link
>     instead of moving the TLVs around into different LSAs.
>
>         2.  The TE Opaque LSA carries link attributes that are not used or
>
>             required by MPLS TE or GMPLS.  There is no mechanism in TE
>     Opaque
>
>             LSA to indicate which of the link attributes should be passed to
>
>             MPLS TE application and which should be used by OSPFv2 and other
>
>             applications.
>
>     OSPF database is a container and OSPF can use any of the LSAS for
>     its own use including the TE LSAs.As far as the TE database goes, it
>     contains data from TE LSAs as well as non-TE LSAs (Network LSA)
>     today so thereasoning described here doesn’t make sense.
>
>         3.  Link attributes used for non-TE purposes is partitioned across
>
>             multiple LSAs - the TE Opaque LSA and the Extended Link Opaque
>
>             LSA.  This partitioning will require implementations to lookup
>
>             multiple LSAs to extract link attributes for a single link,
>
>             bringing needless complexity to the OSPFv2 implementations.
>
>     There will be nodes in the network which will run older software
>     which send these attributes via TE LSAs so the problem of looking
>     into the TE LSAs for TE relatedinformation doesn’t get solved with
>     this draft.  Rather it makes it more complicated. With this draft,
>     the multiple LSA lookup will only increase.An implementation will
>     first have to find if Extended link LSA contains the required info,
>     if not it will need to lookup the info in TE.LSA.
>
> The applications using the TE parameters for non-TE use-cases will use
> the OSPF Prefix/Link attributes for these use cases. Hence, there is no
> requirement to lookup the LSAs in multiple places. Backward
> compatibility will be covered in the specifications of these applications.
>
> Thanks,
>
> Acee
>
>     Looking up multiple LSAs for information is an implementation issue
>     and I am sure there will be implementations that will handle this
>     gracefully so that it doesn’t cause
>
>     delays in critical paths. It doesn’t seem reasonable to come up with
>     protocol extensions to solve implementation issues.
>
>     Rgds
>
>     Shraddha
>
>
>
> _______________________________________________
> OSPF mailing list
> OSPF@ietf.org
> https://www.ietf.org/mailman/listinfo/ospf
>


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Acee,

I would certainly approve an early allocation request for these.
Be aware that new registries created by a draft aren't subject to
early allocation.  Instead, the new registries are maintained by the
associated draft(s).

Please send an email identifying the draft with the IANA early
allocation requests to IANA and cc me, and then I'll send in my
approval.

Regards,
Alia

On Wed, Oct 21, 2015 at 2:02 PM, Acee Lindem (acee) <acee@cisco.com> wrote:

> OSPF Prefix/Link Attributes is close to being published as an RFC and we
> have several requests for early allocation. The first of these is for the
> segment-routing code points. Can we request these from IANA? This draft
> already has allocation of the OSPF RI TLV code point. This would include
> the following code points.
>
>
> 9.2.  OSPF Extended Prefix LSA TLV Registry
>
>    Following values are allocated:
>
>    o 2 - OSPF Extended Prefix Range TLV
>
> 9.3.  OSPF Extended Prefix LSA Sub-TLV Registry
>
>    Following values are allocated:
>
>    o 1 - SID/Label Sub-TLV
>
>    o 2 - Prefix SID Sub-TLV
>
>    o 3 - SID/Label Binding Sub-TLV
>
>    o 4 - IPv4 ERO Sub-TLV
>
>    o 5 - Unnumbered Interface ID ERO Sub-TLV
>
>    o 6 - IPv4 Backup ERO Sub-TLV
>
>    o 7 - Unnumbered Interface ID Backup ERO Sub-TLV
>
>    o 8 - ERO Metric Sub-TLV
>
> 9.4.  OSPF Extended Link LSA Sub-TLV Registry
>
>    Following initial values are allocated:
>
>    o 1 - SID/Label Sub-TLV
>
>    o 2 - Adj-SID Sub-TLV
>
>    o 3 - LAN Adj-SID/Label Sub-TLV
>
>
> Thanks,
> Acee
>
>
> _______________________________________________
> OSPF mailing list
> OSPF@ietf.org
> https://www.ietf.org/mailman/listinfo/ospf
>

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<div dir=3D"ltr">Acee,<div><br></div><div>I would certainly approve an earl=
y allocation request for these.</div><div>Be aware that new registries crea=
ted by a draft aren&#39;t subject to</div><div>early allocation.=C2=A0 Inst=
ead, the new registries are maintained by the</div><div>associated draft(s)=
.</div><div><br></div><div>Please send an email identifying the draft with =
the IANA early</div><div>allocation requests to IANA and cc me, and then I&=
#39;ll send in my</div><div>approval.</div><div><br></div><div>Regards,</di=
v><div>Alia</div></div><div class=3D"gmail_extra"><br><div class=3D"gmail_q=
uote">On Wed, Oct 21, 2015 at 2:02 PM, Acee Lindem (acee) <span dir=3D"ltr"=
>&lt;<a href=3D"mailto:acee@cisco.com" target=3D"_blank">acee@cisco.com</a>=
&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0=
 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">OSPF Prefix/Link Attri=
butes is close to being published as an RFC and we<br>
have several requests for early allocation. The first of these is for the<b=
r>
segment-routing code points. Can we request these from IANA? This draft<br>
already has allocation of the OSPF RI TLV code point. This would include<br=
>
the following code points.<br>
<br>
<br>
9.2.=C2=A0 OSPF Extended Prefix LSA TLV Registry<br>
<br>
=C2=A0 =C2=A0Following values are allocated:<br>
<br>
=C2=A0 =C2=A0o 2 - OSPF Extended Prefix Range TLV<br>
<br>
9.3.=C2=A0 OSPF Extended Prefix LSA Sub-TLV Registry<br>
<br>
=C2=A0 =C2=A0Following values are allocated:<br>
<br>
=C2=A0 =C2=A0o 1 - SID/Label Sub-TLV<br>
<br>
=C2=A0 =C2=A0o 2 - Prefix SID Sub-TLV<br>
<br>
=C2=A0 =C2=A0o 3 - SID/Label Binding Sub-TLV<br>
<br>
=C2=A0 =C2=A0o 4 - IPv4 ERO Sub-TLV<br>
<br>
=C2=A0 =C2=A0o 5 - Unnumbered Interface ID ERO Sub-TLV<br>
<br>
=C2=A0 =C2=A0o 6 - IPv4 Backup ERO Sub-TLV<br>
<br>
=C2=A0 =C2=A0o 7 - Unnumbered Interface ID Backup ERO Sub-TLV<br>
<br>
=C2=A0 =C2=A0o 8 - ERO Metric Sub-TLV<br>
<br>
9.4.=C2=A0 OSPF Extended Link LSA Sub-TLV Registry<br>
<br>
=C2=A0 =C2=A0Following initial values are allocated:<br>
<br>
=C2=A0 =C2=A0o 1 - SID/Label Sub-TLV<br>
<br>
=C2=A0 =C2=A0o 2 - Adj-SID Sub-TLV<br>
<br>
=C2=A0 =C2=A0o 3 - LAN Adj-SID/Label Sub-TLV<br>
<br>
<br>
Thanks,<br>
Acee<br>
<br>
<br>
_______________________________________________<br>
OSPF mailing list<br>
<a href=3D"mailto:OSPF@ietf.org">OSPF@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/ospf" rel=3D"noreferrer" t=
arget=3D"_blank">https://www.ietf.org/mailman/listinfo/ospf</a><br>
</blockquote></div><br></div>

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From: "Acee Lindem (acee)" <acee@cisco.com>
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Thread-Topic: [OSPF] OSPF Segment Routing IANA Early Allocations
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From: Chris Bowers <cbowers@juniper.net>
To: Peter Psenak <ppsenak@cisco.com>, "Acee Lindem (acee)" <acee@cisco.com>, Shraddha Hegde <shraddha@juniper.net>, OSPF WG List <ospf@ietf.org>
Thread-Topic: [OSPF] Regarding draft-ppsenak-ospf-te-link-attr-reuse-00
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Subject: Re: [OSPF] Regarding draft-ppsenak-ospf-te-link-attr-reuse-00
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Peter,

RFC3630 does not appear to restrict the use of the attributes it defines.  =
 The term "TE extensions" may seem to imply some restriction, but the Appli=
cability section of RFC3630 explicitly addresses this potential interpretat=
ion by saying that a more accurate designation is "extended link attributes=
".

1.1.  Applicability

   Many of the extensions specified in this document are in response to
   the requirements stated in [5], and thus are referred to as "traffic
   engineering extensions", and are also commonly associated with MPLS
   Traffic Engineering.  A more accurate (albeit bland) designation is
   "extended link attributes", as the proposal is to simply add more
   attributes to links in OSPF advertisements.

-------
Also, the response below uses the term "TE-enabled" which along with "TE-ap=
plication" does not appear to have a precise definition in draft-ppsenak-os=
pf-te-link-attr-reuse-00.   Based on RFC 3630, it seems reasonable to say t=
hat a link is "TE-enabled" if the link is advertised in the TE Opaque LSA. =
 I don't think this is the meaning you intend, so to avoid confusion, I wil=
l use the term "RFC-3630-TE-enabled" to mean that the link is advertised in=
 the TE Opaque LSA defined in RFC 3630.=20

So can you clarify what "TE-enabled" or a "TE-application" means in your do=
cument?  I assume that it should mean that MPLS is enabled, but it is actua=
lly not clear to me if just having LDP-enabled on a link would qualify as b=
eing "TE-enabled" or not.=20

Thanks,
Chris


-----Original Message-----
From: Peter Psenak [mailto:ppsenak@cisco.com]=20
Sent: Wednesday, October 21, 2015 12:40 PM
To: Chris Bowers <cbowers@juniper.net>; Acee Lindem (acee) <acee@cisco.com>=
; Shraddha Hegde <shraddha@juniper.net>; OSPF WG List <ospf@ietf.org>
Subject: Re: [OSPF] Regarding draft-ppsenak-ospf-te-link-attr-reuse-00

Hi Chris,

On 10/21/15 19:20 , Chris Bowers wrote:
> In my opinion the backwards compatibility problems introduced by this=20
> proposal outweigh potential gains.

there is no backwards compatibility problem with the draft.

>
> As a concrete example, there is at least one existing implementation=20
> of remote LFA where policy is used to select a backup tunnel that does=20
> not share an SRLG with the failed link.  This SRLG information is=20
> carried in the TE Opaque LSA.

that is fine, you are free to do that if the link is TE enabled, there is n=
o problem. If the link is not TE enabled and you use TE Opaque LSA to flood=
 the SRLG data for such link, you are going against the current specificati=
on. There is no way to do that today, because any router that would receive=
 such TE Opaque LSA must assume such link is TE enabled.

>
> As it currently reads, I think the proposal in
>   draft-ppsenak-ospf-te-link-attr-reuse has the potential to break=20
> existing standards-compliant implementations.

I don't believe so.

>
> I might be OK with having the proposal only apply to sub-TLVs  that=20
> get defined in the future.  However, I think that taking TLVs that were
>   standardized over ten years ago, and selectively moving them or=20
> copying them to a different LSA based on a set of rules that is=20
> subject to interpretation is going to create confusion and=20
> interoperability headaches.

What we propose is the way to advertise link attributes without making the =
link part of TE topology. We simply do not have a way to do that today. I d=
o not see any problem in doing so, because we do not change anything on the=
 TE Opaque LSA side, we are defining something new.

thanks,
Peter

>
> Chris
>
> *From:*OSPF [mailto:ospf-bounces@ietf.org] *On Behalf Of *Acee Lindem=20
> (acee)
> *Sent:* Wednesday, October 21, 2015 6:48 AM
> *To:* Shraddha Hegde <shraddha@juniper.net>; OSPF WG List=20
> <ospf@ietf.org>
> *Subject:* Re: [OSPF] Regarding=20
> draft-ppsenak-ospf-te-link-attr-reuse-00
>
> Hi Shraddha,
>
> *From: *OSPF <ospf-bounces@ietf.org <mailto:ospf-bounces@ietf.org>> on=20
> behalf of Shraddha Hegde <shraddha@juniper.net=20
> <mailto:shraddha@juniper.net>>
> *Date: *Wednesday, October 21, 2015 at 1:20 AM
> *To: *OSPF WG List <ospf@ietf.org <mailto:ospf@ietf.org>>
> *Subject: *[OSPF] Regarding draft-ppsenak-ospf-te-link-attr-reuse-00
>
>     Hi All,
>
>     draft-ppsenak-ospf-te-link-attr-reuse-00 proposes moving and/or
>     copying TLVs from the TE Opaque LSA to the Extended Link Opaque LSA.
>     The draft lists the problems that the draft is trying to solve.  I
>     have reproduced that list of problems below, with each problem
>     followed by what I believe to be a better and simpler solution.
>
>         1.  Whenever the link is advertised in a TE Opaque LSA, the=20
> link
>
>             becomes a part of the TE topology, which may not match IP=20
> routed
>
>             topology.  By making the link part of the TE topology,=20
> remote
>
>             nodes may mistakenly believe that the link is available=20
> for MPLS
>
>             TE or GMPLS, when, in fact, MPLS is not enabled on the link.
>
>     To address this issue, we simply need to define a new sub-TLV in the
>     TE Link LSAto say whether MPLS/GMPLS/RSVP is enabled on the link
>     instead of moving the TLVs around into different LSAs.
>
>         2.  The TE Opaque LSA carries link attributes that are not=20
> used or
>
>             required by MPLS TE or GMPLS.  There is no mechanism in TE
>     Opaque
>
>             LSA to indicate which of the link attributes should be=20
> passed to
>
>             MPLS TE application and which should be used by OSPFv2 and=20
> other
>
>             applications.
>
>     OSPF database is a container and OSPF can use any of the LSAS for
>     its own use including the TE LSAs.As far as the TE database goes, it
>     contains data from TE LSAs as well as non-TE LSAs (Network LSA)
>     today so thereasoning described here doesn't make sense.
>
>         3.  Link attributes used for non-TE purposes is partitioned=20
> across
>
>             multiple LSAs - the TE Opaque LSA and the Extended Link=20
> Opaque
>
>             LSA.  This partitioning will require implementations to=20
> lookup
>
>             multiple LSAs to extract link attributes for a single=20
> link,
>
>             bringing needless complexity to the OSPFv2 implementations.
>
>     There will be nodes in the network which will run older software
>     which send these attributes via TE LSAs so the problem of looking
>     into the TE LSAs for TE relatedinformation doesn't get solved with
>     this draft.  Rather it makes it more complicated. With this draft,
>     the multiple LSA lookup will only increase.An implementation will
>     first have to find if Extended link LSA contains the required info,
>     if not it will need to lookup the info in TE.LSA.
>
> The applications using the TE parameters for non-TE use-cases will use=20
> the OSPF Prefix/Link attributes for these use cases. Hence, there is=20
> no requirement to lookup the LSAs in multiple places. Backward=20
> compatibility will be covered in the specifications of these applications=
.
>
> Thanks,
>
> Acee
>
>     Looking up multiple LSAs for information is an implementation issue
>     and I am sure there will be implementations that will handle this
>     gracefully so that it doesn't cause
>
>     delays in critical paths. It doesn't seem reasonable to come up with
>     protocol extensions to solve implementation issues.
>
>     Rgds
>
>     Shraddha
>
>
>
> _______________________________________________
> OSPF mailing list
> OSPF@ietf.org
> https://www.ietf.org/mailman/listinfo/ospf
>


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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Chris Bowers <cbowers@juniper.net>, "Peter Psenak (ppsenak)" <ppsenak@cisco.com>, Shraddha Hegde <shraddha@juniper.net>, OSPF WG List <ospf@ietf.org>
Thread-Topic: [OSPF] Regarding draft-ppsenak-ospf-te-link-attr-reuse-00
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Subject: Re: [OSPF] Regarding draft-ppsenak-ospf-te-link-attr-reuse-00
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Date: Wed, 21 Oct 2015 22:23:51 +0200
From: Peter Psenak <ppsenak@cisco.com>
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To: Chris Bowers <cbowers@juniper.net>, "Acee Lindem (acee)" <acee@cisco.com>,  Shraddha Hegde <shraddha@juniper.net>, OSPF WG List <ospf@ietf.org>
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Subject: Re: [OSPF] Regarding draft-ppsenak-ospf-te-link-attr-reuse-00
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Hi Chris,

On 10/21/15 21:44 , Chris Bowers wrote:
> Peter,
>
> RFC3630 does not appear to restrict the use of the attributes it defines.   The term "TE extensions" may seem to imply some restriction, but the Applicability section of RFC3630 explicitly addresses this potential interpretation by saying that a more accurate designation is "extended link attributes".
>
> 1.1.  Applicability
>
>     Many of the extensions specified in this document are in response to
>     the requirements stated in [5], and thus are referred to as "traffic
>     engineering extensions", and are also commonly associated with MPLS
>     Traffic Engineering.  A more accurate (albeit bland) designation is
>     "extended link attributes", as the proposal is to simply add more
>     attributes to links in OSPF advertisements.

RFC3630 says:

    The extensions provide a way of describing the traffic engineering
    topology (including bandwidth and administrative constraints) and
    distributing this information within a given OSPF area.  This
    topology does not necessarily match the regular routed topology,

above clearly indicates that if the link is advertised in TE Opaque LSA, 
it is part of the TE topology, otherwise it is not. That restricts the 
usage of the TE Opaque LSA to the links that are part of the TE topology.

>
> -------
> Also, the response below uses the term "TE-enabled" which along with "TE-application" does not appear to have a precise definition in draft-ppsenak-ospf-te-link-attr-reuse-00.   Based on RFC 3630, it seems reasonable to say that a link is "TE-enabled" if the link is advertised in the TE Opaque LSA.  I don't think this is the meaning you intend, so to avoid confusion, I will use the term "RFC-3630-TE-enabled" to mean that the link is advertised in the TE Opaque LSA defined in RFC 3630.
>
> So can you clarify what "TE-enabled" or a "TE-application" means in your document?  I assume that it should mean that MPLS is enabled, but it is actually not clear to me if just having LDP-enabled on a link would qualify as being "TE-enabled" or not.

TE-enabled means the link is part of the traffic engineering topology as 
described by RFC3630.

thanks,
Peter

>
> Thanks,
> Chris
>
>
> -----Original Message-----
> From: Peter Psenak [mailto:ppsenak@cisco.com]
> Sent: Wednesday, October 21, 2015 12:40 PM
> To: Chris Bowers <cbowers@juniper.net>; Acee Lindem (acee) <acee@cisco.com>; Shraddha Hegde <shraddha@juniper.net>; OSPF WG List <ospf@ietf.org>
> Subject: Re: [OSPF] Regarding draft-ppsenak-ospf-te-link-attr-reuse-00
>
> Hi Chris,
>
> On 10/21/15 19:20 , Chris Bowers wrote:
>> In my opinion the backwards compatibility problems introduced by this
>> proposal outweigh potential gains.
>
> there is no backwards compatibility problem with the draft.
>
>>
>> As a concrete example, there is at least one existing implementation
>> of remote LFA where policy is used to select a backup tunnel that does
>> not share an SRLG with the failed link.  This SRLG information is
>> carried in the TE Opaque LSA.
>
> that is fine, you are free to do that if the link is TE enabled, there is no problem. If the link is not TE enabled and you use TE Opaque LSA to flood the SRLG data for such link, you are going against the current specification. There is no way to do that today, because any router that would receive such TE Opaque LSA must assume such link is TE enabled.
>
>>
>> As it currently reads, I think the proposal in
>>    draft-ppsenak-ospf-te-link-attr-reuse has the potential to break
>> existing standards-compliant implementations.
>
> I don't believe so.
>
>>
>> I might be OK with having the proposal only apply to sub-TLVs  that
>> get defined in the future.  However, I think that taking TLVs that were
>>    standardized over ten years ago, and selectively moving them or
>> copying them to a different LSA based on a set of rules that is
>> subject to interpretation is going to create confusion and
>> interoperability headaches.
>
> What we propose is the way to advertise link attributes without making the link part of TE topology. We simply do not have a way to do that today. I do not see any problem in doing so, because we do not change anything on the TE Opaque LSA side, we are defining something new.
>
> thanks,
> Peter
>
>>
>> Chris
>>
>> *From:*OSPF [mailto:ospf-bounces@ietf.org] *On Behalf Of *Acee Lindem
>> (acee)
>> *Sent:* Wednesday, October 21, 2015 6:48 AM
>> *To:* Shraddha Hegde <shraddha@juniper.net>; OSPF WG List
>> <ospf@ietf.org>
>> *Subject:* Re: [OSPF] Regarding
>> draft-ppsenak-ospf-te-link-attr-reuse-00
>>
>> Hi Shraddha,
>>
>> *From: *OSPF <ospf-bounces@ietf.org <mailto:ospf-bounces@ietf.org>> on
>> behalf of Shraddha Hegde <shraddha@juniper.net
>> <mailto:shraddha@juniper.net>>
>> *Date: *Wednesday, October 21, 2015 at 1:20 AM
>> *To: *OSPF WG List <ospf@ietf.org <mailto:ospf@ietf.org>>
>> *Subject: *[OSPF] Regarding draft-ppsenak-ospf-te-link-attr-reuse-00
>>
>>      Hi All,
>>
>>      draft-ppsenak-ospf-te-link-attr-reuse-00 proposes moving and/or
>>      copying TLVs from the TE Opaque LSA to the Extended Link Opaque LSA.
>>      The draft lists the problems that the draft is trying to solve.  I
>>      have reproduced that list of problems below, with each problem
>>      followed by what I believe to be a better and simpler solution.
>>
>>          1.  Whenever the link is advertised in a TE Opaque LSA, the
>> link
>>
>>              becomes a part of the TE topology, which may not match IP
>> routed
>>
>>              topology.  By making the link part of the TE topology,
>> remote
>>
>>              nodes may mistakenly believe that the link is available
>> for MPLS
>>
>>              TE or GMPLS, when, in fact, MPLS is not enabled on the link.
>>
>>      To address this issue, we simply need to define a new sub-TLV in the
>>      TE Link LSAto say whether MPLS/GMPLS/RSVP is enabled on the link
>>      instead of moving the TLVs around into different LSAs.
>>
>>          2.  The TE Opaque LSA carries link attributes that are not
>> used or
>>
>>              required by MPLS TE or GMPLS.  There is no mechanism in TE
>>      Opaque
>>
>>              LSA to indicate which of the link attributes should be
>> passed to
>>
>>              MPLS TE application and which should be used by OSPFv2 and
>> other
>>
>>              applications.
>>
>>      OSPF database is a container and OSPF can use any of the LSAS for
>>      its own use including the TE LSAs.As far as the TE database goes, it
>>      contains data from TE LSAs as well as non-TE LSAs (Network LSA)
>>      today so thereasoning described here doesn't make sense.
>>
>>          3.  Link attributes used for non-TE purposes is partitioned
>> across
>>
>>              multiple LSAs - the TE Opaque LSA and the Extended Link
>> Opaque
>>
>>              LSA.  This partitioning will require implementations to
>> lookup
>>
>>              multiple LSAs to extract link attributes for a single
>> link,
>>
>>              bringing needless complexity to the OSPFv2 implementations.
>>
>>      There will be nodes in the network which will run older software
>>      which send these attributes via TE LSAs so the problem of looking
>>      into the TE LSAs for TE relatedinformation doesn't get solved with
>>      this draft.  Rather it makes it more complicated. With this draft,
>>      the multiple LSA lookup will only increase.An implementation will
>>      first have to find if Extended link LSA contains the required info,
>>      if not it will need to lookup the info in TE.LSA.
>>
>> The applications using the TE parameters for non-TE use-cases will use
>> the OSPF Prefix/Link attributes for these use cases. Hence, there is
>> no requirement to lookup the LSAs in multiple places. Backward
>> compatibility will be covered in the specifications of these applications.
>>
>> Thanks,
>>
>> Acee
>>
>>      Looking up multiple LSAs for information is an implementation issue
>>      and I am sure there will be implementations that will handle this
>>      gracefully so that it doesn't cause
>>
>>      delays in critical paths. It doesn't seem reasonable to come up with
>>      protocol extensions to solve implementation issues.
>>
>>      Rgds
>>
>>      Shraddha
>>
>>
>>
>> _______________________________________________
>> OSPF mailing list
>> OSPF@ietf.org
>> https://www.ietf.org/mailman/listinfo/ospf
>>
>
> .
>


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From: Chris Bowers <cbowers@juniper.net>
To: Peter Psenak <ppsenak@cisco.com>, "Acee Lindem (acee)" <acee@cisco.com>, Shraddha Hegde <shraddha@juniper.net>, OSPF WG List <ospf@ietf.org>
Thread-Topic: [OSPF] Regarding draft-ppsenak-ospf-te-link-attr-reuse-00
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Subject: Re: [OSPF] Regarding draft-ppsenak-ospf-te-link-attr-reuse-00
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Peter,

I would suggest making the text of the draft more explicit about the condit=
ions under which a given link and set of attributes should be included in t=
he TE Opaque LSA or the Extended Link Opaque LSA.  RFC3630 is subject to in=
terpretation on its own, and since it was written before the existence of t=
he Extended Link Opaque LSA, it is not self-evident how to interpret it wit=
h respect to using this new LSA.   Clarifying the proposed rules for use of=
 the TE Opaque LSA or the Extended Link Opaque LSA without relying on inter=
pretations of 3630 will be helpful.  It will help the WG evaluate the propo=
sal overall and determine what, if any, backwards compatibility issues this=
 proposal may cause with existing implementations.  It may also help future=
 implementers avoid interoperability and backwards compatibility issues.

As a concrete example, I think it would be useful to explicitly address the=
 case of how to advertise a link that only supports LDP in the text of the =
draft.   Below is an example of a format that would clarify this.    From t=
he response to my question below regarding LDP, I assume that a link that o=
nly supports LDP signaling and not RSVP-signaling would not be advertised i=
n the TE Opaque LSA.  However, I am honestly not positive that this is what=
 is intended.

Format of proposed clarifying text:
------------------

A link MUST NOT be advertised in the TE Opaque LSA under the following cond=
itions:

1) The link does not support RSVP-TE signaling.

2) Another condition...

A link MAY be advertised in the TE Opaque LSA under the following condition=
s:

1) Another condition ...

A link MUST NOT be advertised in the Extended Link Opaque LSA under the fol=
lowing conditions:

1) Some other condition ....

Thanks,
Chris



-----Original Message-----
From: Peter Psenak [mailto:ppsenak@cisco.com]=20
Sent: Wednesday, October 21, 2015 3:24 PM
To: Chris Bowers <cbowers@juniper.net>; Acee Lindem (acee) <acee@cisco.com>=
; Shraddha Hegde <shraddha@juniper.net>; OSPF WG List <ospf@ietf.org>
Subject: Re: [OSPF] Regarding draft-ppsenak-ospf-te-link-attr-reuse-00

Hi Chris,

On 10/21/15 21:44 , Chris Bowers wrote:
> Peter,
>
> RFC3630 does not appear to restrict the use of the attributes it defines.=
   The term "TE extensions" may seem to imply some restriction, but the App=
licability section of RFC3630 explicitly addresses this potential interpret=
ation by saying that a more accurate designation is "extended link attribut=
es".
>
> 1.1.  Applicability
>
>     Many of the extensions specified in this document are in response to
>     the requirements stated in [5], and thus are referred to as "traffic
>     engineering extensions", and are also commonly associated with MPLS
>     Traffic Engineering.  A more accurate (albeit bland) designation is
>     "extended link attributes", as the proposal is to simply add more
>     attributes to links in OSPF advertisements.

RFC3630 says:

    The extensions provide a way of describing the traffic engineering
    topology (including bandwidth and administrative constraints) and
    distributing this information within a given OSPF area.  This
    topology does not necessarily match the regular routed topology,

above clearly indicates that if the link is advertised in TE Opaque LSA, it=
 is part of the TE topology, otherwise it is not. That restricts the usage =
of the TE Opaque LSA to the links that are part of the TE topology.

>
> -------
> Also, the response below uses the term "TE-enabled" which along with "TE-=
application" does not appear to have a precise definition in draft-ppsenak-=
ospf-te-link-attr-reuse-00.   Based on RFC 3630, it seems reasonable to say=
 that a link is "TE-enabled" if the link is advertised in the TE Opaque LSA=
.  I don't think this is the meaning you intend, so to avoid confusion, I w=
ill use the term "RFC-3630-TE-enabled" to mean that the link is advertised =
in the TE Opaque LSA defined in RFC 3630.
>
> So can you clarify what "TE-enabled" or a "TE-application" means in your =
document?  I assume that it should mean that MPLS is enabled, but it is act=
ually not clear to me if just having LDP-enabled on a link would qualify as=
 being "TE-enabled" or not.

TE-enabled means the link is part of the traffic engineering topology as=20
described by RFC3630.

thanks,
Peter

>
> Thanks,
> Chris
>
>
> -----Original Message-----
> From: Peter Psenak [mailto:ppsenak@cisco.com]
> Sent: Wednesday, October 21, 2015 12:40 PM
> To: Chris Bowers <cbowers@juniper.net>; Acee Lindem (acee) <acee@cisco.co=
m>; Shraddha Hegde <shraddha@juniper.net>; OSPF WG List <ospf@ietf.org>
> Subject: Re: [OSPF] Regarding draft-ppsenak-ospf-te-link-attr-reuse-00
>
> Hi Chris,
>
> On 10/21/15 19:20 , Chris Bowers wrote:
>> In my opinion the backwards compatibility problems introduced by this
>> proposal outweigh potential gains.
>
> there is no backwards compatibility problem with the draft.
>
>>
>> As a concrete example, there is at least one existing implementation
>> of remote LFA where policy is used to select a backup tunnel that does
>> not share an SRLG with the failed link.  This SRLG information is
>> carried in the TE Opaque LSA.
>
> that is fine, you are free to do that if the link is TE enabled, there is=
 no problem. If the link is not TE enabled and you use TE Opaque LSA to flo=
od the SRLG data for such link, you are going against the current specifica=
tion. There is no way to do that today, because any router that would recei=
ve such TE Opaque LSA must assume such link is TE enabled.
>
>>
>> As it currently reads, I think the proposal in
>>    draft-ppsenak-ospf-te-link-attr-reuse has the potential to break
>> existing standards-compliant implementations.
>
> I don't believe so.
>
>>
>> I might be OK with having the proposal only apply to sub-TLVs  that
>> get defined in the future.  However, I think that taking TLVs that were
>>    standardized over ten years ago, and selectively moving them or
>> copying them to a different LSA based on a set of rules that is
>> subject to interpretation is going to create confusion and
>> interoperability headaches.
>
> What we propose is the way to advertise link attributes without making th=
e link part of TE topology. We simply do not have a way to do that today. I=
 do not see any problem in doing so, because we do not change anything on t=
he TE Opaque LSA side, we are defining something new.
>
> thanks,
> Peter
>
>>
>> Chris
>>
>> *From:*OSPF [mailto:ospf-bounces@ietf.org] *On Behalf Of *Acee Lindem
>> (acee)
>> *Sent:* Wednesday, October 21, 2015 6:48 AM
>> *To:* Shraddha Hegde <shraddha@juniper.net>; OSPF WG List
>> <ospf@ietf.org>
>> *Subject:* Re: [OSPF] Regarding
>> draft-ppsenak-ospf-te-link-attr-reuse-00
>>
>> Hi Shraddha,
>>
>> *From: *OSPF <ospf-bounces@ietf.org <mailto:ospf-bounces@ietf.org>> on
>> behalf of Shraddha Hegde <shraddha@juniper.net
>> <mailto:shraddha@juniper.net>>
>> *Date: *Wednesday, October 21, 2015 at 1:20 AM
>> *To: *OSPF WG List <ospf@ietf.org <mailto:ospf@ietf.org>>
>> *Subject: *[OSPF] Regarding draft-ppsenak-ospf-te-link-attr-reuse-00
>>
>>      Hi All,
>>
>>      draft-ppsenak-ospf-te-link-attr-reuse-00 proposes moving and/or
>>      copying TLVs from the TE Opaque LSA to the Extended Link Opaque LSA=
.
>>      The draft lists the problems that the draft is trying to solve.  I
>>      have reproduced that list of problems below, with each problem
>>      followed by what I believe to be a better and simpler solution.
>>
>>          1.  Whenever the link is advertised in a TE Opaque LSA, the
>> link
>>
>>              becomes a part of the TE topology, which may not match IP
>> routed
>>
>>              topology.  By making the link part of the TE topology,
>> remote
>>
>>              nodes may mistakenly believe that the link is available
>> for MPLS
>>
>>              TE or GMPLS, when, in fact, MPLS is not enabled on the link=
.
>>
>>      To address this issue, we simply need to define a new sub-TLV in th=
e
>>      TE Link LSAto say whether MPLS/GMPLS/RSVP is enabled on the link
>>      instead of moving the TLVs around into different LSAs.
>>
>>          2.  The TE Opaque LSA carries link attributes that are not
>> used or
>>
>>              required by MPLS TE or GMPLS.  There is no mechanism in TE
>>      Opaque
>>
>>              LSA to indicate which of the link attributes should be
>> passed to
>>
>>              MPLS TE application and which should be used by OSPFv2 and
>> other
>>
>>              applications.
>>
>>      OSPF database is a container and OSPF can use any of the LSAS for
>>      its own use including the TE LSAs.As far as the TE database goes, i=
t
>>      contains data from TE LSAs as well as non-TE LSAs (Network LSA)
>>      today so thereasoning described here doesn't make sense.
>>
>>          3.  Link attributes used for non-TE purposes is partitioned
>> across
>>
>>              multiple LSAs - the TE Opaque LSA and the Extended Link
>> Opaque
>>
>>              LSA.  This partitioning will require implementations to
>> lookup
>>
>>              multiple LSAs to extract link attributes for a single
>> link,
>>
>>              bringing needless complexity to the OSPFv2 implementations.
>>
>>      There will be nodes in the network which will run older software
>>      which send these attributes via TE LSAs so the problem of looking
>>      into the TE LSAs for TE relatedinformation doesn't get solved with
>>      this draft.  Rather it makes it more complicated. With this draft,
>>      the multiple LSA lookup will only increase.An implementation will
>>      first have to find if Extended link LSA contains the required info,
>>      if not it will need to lookup the info in TE.LSA.
>>
>> The applications using the TE parameters for non-TE use-cases will use
>> the OSPF Prefix/Link attributes for these use cases. Hence, there is
>> no requirement to lookup the LSAs in multiple places. Backward
>> compatibility will be covered in the specifications of these application=
s.
>>
>> Thanks,
>>
>> Acee
>>
>>      Looking up multiple LSAs for information is an implementation issue
>>      and I am sure there will be implementations that will handle this
>>      gracefully so that it doesn't cause
>>
>>      delays in critical paths. It doesn't seem reasonable to come up wit=
h
>>      protocol extensions to solve implementation issues.
>>
>>      Rgds
>>
>>      Shraddha
>>
>>
>>
>> _______________________________________________
>> OSPF mailing list
>> OSPF@ietf.org
>> https://www.ietf.org/mailman/listinfo/ospf
>>
>
> .
>


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<no-hat>

The LFA and RLFA work both have the ability to use SRLG information, which
has only been available in the TE Opaque LSA.  That's not been considered a
problem.

The TE Opaque LSA would be, presumably, required if SPRING is supported
which has no implications on whether RSVP-TE is enabled.

My question is what does an assumption about being "TE-enabled" mean?
What are the benefits of trying to change interpretations that have existed
for
at least 5+ years?

Regards,
Alia
</no-hat>

On Thu, Oct 22, 2015 at 11:00 AM, Chris Bowers <cbowers@juniper.net> wrote:

> Peter,
>
> I would suggest making the text of the draft more explicit about the
> conditions under which a given link and set of attributes should be
> included in the TE Opaque LSA or the Extended Link Opaque LSA.  RFC3630 is
> subject to interpretation on its own, and since it was written before the
> existence of the Extended Link Opaque LSA, it is not self-evident how to
> interpret it with respect to using this new LSA.   Clarifying the proposed
> rules for use of the TE Opaque LSA or the Extended Link Opaque LSA without
> relying on interpretations of 3630 will be helpful.  It will help the WG
> evaluate the proposal overall and determine what, if any, backwards
> compatibility issues this proposal may cause with existing
> implementations.  It may also help future implementers avoid
> interoperability and backwards compatibility issues.
>
> As a concrete example, I think it would be useful to explicitly address
> the case of how to advertise a link that only supports LDP in the text of
> the draft.   Below is an example of a format that would clarify this.
> From the response to my question below regarding LDP, I assume that a link
> that only supports LDP signaling and not RSVP-signaling would not be
> advertised in the TE Opaque LSA.  However, I am honestly not positive that
> this is what is intended.
>
> Format of proposed clarifying text:
> ------------------
>
> A link MUST NOT be advertised in the TE Opaque LSA under the following
> conditions:
>
> 1) The link does not support RSVP-TE signaling.
>
> 2) Another condition...
>
> A link MAY be advertised in the TE Opaque LSA under the following
> conditions:
>
> 1) Another condition ...
>
> A link MUST NOT be advertised in the Extended Link Opaque LSA under the
> following conditions:
>
> 1) Some other condition ....
>
> Thanks,
> Chris
>
>
>
> -----Original Message-----
> From: Peter Psenak [mailto:ppsenak@cisco.com]
> Sent: Wednesday, October 21, 2015 3:24 PM
> To: Chris Bowers <cbowers@juniper.net>; Acee Lindem (acee) <acee@cisco.com>;
> Shraddha Hegde <shraddha@juniper.net>; OSPF WG List <ospf@ietf.org>
> Subject: Re: [OSPF] Regarding draft-ppsenak-ospf-te-link-attr-reuse-00
>
> Hi Chris,
>
> On 10/21/15 21:44 , Chris Bowers wrote:
> > Peter,
> >
> > RFC3630 does not appear to restrict the use of the attributes it
> defines.   The term "TE extensions" may seem to imply some restriction, but
> the Applicability section of RFC3630 explicitly addresses this potential
> interpretation by saying that a more accurate designation is "extended link
> attributes".
> >
> > 1.1.  Applicability
> >
> >     Many of the extensions specified in this document are in response to
> >     the requirements stated in [5], and thus are referred to as "traffic
> >     engineering extensions", and are also commonly associated with MPLS
> >     Traffic Engineering.  A more accurate (albeit bland) designation is
> >     "extended link attributes", as the proposal is to simply add more
> >     attributes to links in OSPF advertisements.
>
> RFC3630 says:
>
>     The extensions provide a way of describing the traffic engineering
>     topology (including bandwidth and administrative constraints) and
>     distributing this information within a given OSPF area.  This
>     topology does not necessarily match the regular routed topology,
>
> above clearly indicates that if the link is advertised in TE Opaque LSA,
> it is part of the TE topology, otherwise it is not. That restricts the
> usage of the TE Opaque LSA to the links that are part of the TE topology.
>
> >
> > -------
> > Also, the response below uses the term "TE-enabled" which along with
> "TE-application" does not appear to have a precise definition in
> draft-ppsenak-ospf-te-link-attr-reuse-00.   Based on RFC 3630, it seems
> reasonable to say that a link is "TE-enabled" if the link is advertised in
> the TE Opaque LSA.  I don't think this is the meaning you intend, so to
> avoid confusion, I will use the term "RFC-3630-TE-enabled" to mean that the
> link is advertised in the TE Opaque LSA defined in RFC 3630.
> >
> > So can you clarify what "TE-enabled" or a "TE-application" means in your
> document?  I assume that it should mean that MPLS is enabled, but it is
> actually not clear to me if just having LDP-enabled on a link would qualify
> as being "TE-enabled" or not.
>
> TE-enabled means the link is part of the traffic engineering topology as
> described by RFC3630.
>
> thanks,
> Peter
>
> >
> > Thanks,
> > Chris
> >
> >
> > -----Original Message-----
> > From: Peter Psenak [mailto:ppsenak@cisco.com]
> > Sent: Wednesday, October 21, 2015 12:40 PM
> > To: Chris Bowers <cbowers@juniper.net>; Acee Lindem (acee) <
> acee@cisco.com>; Shraddha Hegde <shraddha@juniper.net>; OSPF WG List <
> ospf@ietf.org>
> > Subject: Re: [OSPF] Regarding draft-ppsenak-ospf-te-link-attr-reuse-00
> >
> > Hi Chris,
> >
> > On 10/21/15 19:20 , Chris Bowers wrote:
> >> In my opinion the backwards compatibility problems introduced by this
> >> proposal outweigh potential gains.
> >
> > there is no backwards compatibility problem with the draft.
> >
> >>
> >> As a concrete example, there is at least one existing implementation
> >> of remote LFA where policy is used to select a backup tunnel that does
> >> not share an SRLG with the failed link.  This SRLG information is
> >> carried in the TE Opaque LSA.
> >
> > that is fine, you are free to do that if the link is TE enabled, there
> is no problem. If the link is not TE enabled and you use TE Opaque LSA to
> flood the SRLG data for such link, you are going against the current
> specification. There is no way to do that today, because any router that
> would receive such TE Opaque LSA must assume such link is TE enabled.
> >
> >>
> >> As it currently reads, I think the proposal in
> >>    draft-ppsenak-ospf-te-link-attr-reuse has the potential to break
> >> existing standards-compliant implementations.
> >
> > I don't believe so.
> >
> >>
> >> I might be OK with having the proposal only apply to sub-TLVs  that
> >> get defined in the future.  However, I think that taking TLVs that were
> >>    standardized over ten years ago, and selectively moving them or
> >> copying them to a different LSA based on a set of rules that is
> >> subject to interpretation is going to create confusion and
> >> interoperability headaches.
> >
> > What we propose is the way to advertise link attributes without making
> the link part of TE topology. We simply do not have a way to do that today.
> I do not see any problem in doing so, because we do not change anything on
> the TE Opaque LSA side, we are defining something new.
> >
> > thanks,
> > Peter
> >
> >>
> >> Chris
> >>
> >> *From:*OSPF [mailto:ospf-bounces@ietf.org] *On Behalf Of *Acee Lindem
> >> (acee)
> >> *Sent:* Wednesday, October 21, 2015 6:48 AM
> >> *To:* Shraddha Hegde <shraddha@juniper.net>; OSPF WG List
> >> <ospf@ietf.org>
> >> *Subject:* Re: [OSPF] Regarding
> >> draft-ppsenak-ospf-te-link-attr-reuse-00
> >>
> >> Hi Shraddha,
> >>
> >> *From: *OSPF <ospf-bounces@ietf.org <mailto:ospf-bounces@ietf.org>> on
> >> behalf of Shraddha Hegde <shraddha@juniper.net
> >> <mailto:shraddha@juniper.net>>
> >> *Date: *Wednesday, October 21, 2015 at 1:20 AM
> >> *To: *OSPF WG List <ospf@ietf.org <mailto:ospf@ietf.org>>
> >> *Subject: *[OSPF] Regarding draft-ppsenak-ospf-te-link-attr-reuse-00
> >>
> >>      Hi All,
> >>
> >>      draft-ppsenak-ospf-te-link-attr-reuse-00 proposes moving and/or
> >>      copying TLVs from the TE Opaque LSA to the Extended Link Opaque
> LSA.
> >>      The draft lists the problems that the draft is trying to solve.  I
> >>      have reproduced that list of problems below, with each problem
> >>      followed by what I believe to be a better and simpler solution.
> >>
> >>          1.  Whenever the link is advertised in a TE Opaque LSA, the
> >> link
> >>
> >>              becomes a part of the TE topology, which may not match IP
> >> routed
> >>
> >>              topology.  By making the link part of the TE topology,
> >> remote
> >>
> >>              nodes may mistakenly believe that the link is available
> >> for MPLS
> >>
> >>              TE or GMPLS, when, in fact, MPLS is not enabled on the
> link.
> >>
> >>      To address this issue, we simply need to define a new sub-TLV in
> the
> >>      TE Link LSAto say whether MPLS/GMPLS/RSVP is enabled on the link
> >>      instead of moving the TLVs around into different LSAs.
> >>
> >>          2.  The TE Opaque LSA carries link attributes that are not
> >> used or
> >>
> >>              required by MPLS TE or GMPLS.  There is no mechanism in TE
> >>      Opaque
> >>
> >>              LSA to indicate which of the link attributes should be
> >> passed to
> >>
> >>              MPLS TE application and which should be used by OSPFv2 and
> >> other
> >>
> >>              applications.
> >>
> >>      OSPF database is a container and OSPF can use any of the LSAS for
> >>      its own use including the TE LSAs.As far as the TE database goes,
> it
> >>      contains data from TE LSAs as well as non-TE LSAs (Network LSA)
> >>      today so thereasoning described here doesn't make sense.
> >>
> >>          3.  Link attributes used for non-TE purposes is partitioned
> >> across
> >>
> >>              multiple LSAs - the TE Opaque LSA and the Extended Link
> >> Opaque
> >>
> >>              LSA.  This partitioning will require implementations to
> >> lookup
> >>
> >>              multiple LSAs to extract link attributes for a single
> >> link,
> >>
> >>              bringing needless complexity to the OSPFv2 implementations.
> >>
> >>      There will be nodes in the network which will run older software
> >>      which send these attributes via TE LSAs so the problem of looking
> >>      into the TE LSAs for TE relatedinformation doesn't get solved with
> >>      this draft.  Rather it makes it more complicated. With this draft,
> >>      the multiple LSA lookup will only increase.An implementation will
> >>      first have to find if Extended link LSA contains the required info,
> >>      if not it will need to lookup the info in TE.LSA.
> >>
> >> The applications using the TE parameters for non-TE use-cases will use
> >> the OSPF Prefix/Link attributes for these use cases. Hence, there is
> >> no requirement to lookup the LSAs in multiple places. Backward
> >> compatibility will be covered in the specifications of these
> applications.
> >>
> >> Thanks,
> >>
> >> Acee
> >>
> >>      Looking up multiple LSAs for information is an implementation issue
> >>      and I am sure there will be implementations that will handle this
> >>      gracefully so that it doesn't cause
> >>
> >>      delays in critical paths. It doesn't seem reasonable to come up
> with
> >>      protocol extensions to solve implementation issues.
> >>
> >>      Rgds
> >>
> >>      Shraddha
> >>
> >>
> >>
> >> _______________________________________________
> >> OSPF mailing list
> >> OSPF@ietf.org
> >> https://www.ietf.org/mailman/listinfo/ospf
> >>
> >
> > .
> >
>
> _______________________________________________
> OSPF mailing list
> OSPF@ietf.org
> https://www.ietf.org/mailman/listinfo/ospf
>

--001a113ce9d8c994a40522b46ea0
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">&lt;no-hat&gt;<div><br></div><div>The LFA and RLFA work bo=
th have the ability to use SRLG information, which</div><div>has only been =
available in the TE Opaque LSA.=C2=A0 That&#39;s not been considered a</div=
><div>problem.</div><div><br></div><div>The TE Opaque LSA would be, presuma=
bly, required if SPRING is supported</div><div>which has no implications on=
 whether RSVP-TE is enabled.</div><div><br></div><div>My question is what d=
oes an assumption about being &quot;TE-enabled&quot; mean?</div><div>What a=
re the benefits of trying to change interpretations that have existed for</=
div><div>at least 5+ years?</div><div><br></div><div>Regards,</div><div>Ali=
a</div><div>&lt;/no-hat&gt;</div></div><div class=3D"gmail_extra"><br><div =
class=3D"gmail_quote">On Thu, Oct 22, 2015 at 11:00 AM, Chris Bowers <span =
dir=3D"ltr">&lt;<a href=3D"mailto:cbowers@juniper.net" target=3D"_blank">cb=
owers@juniper.net</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote=
" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">P=
eter,<br>
<br>
I would suggest making the text of the draft more explicit about the condit=
ions under which a given link and set of attributes should be included in t=
he TE Opaque LSA or the Extended Link Opaque LSA.=C2=A0 RFC3630 is subject =
to interpretation on its own, and since it was written before the existence=
 of the Extended Link Opaque LSA, it is not self-evident how to interpret i=
t with respect to using this new LSA.=C2=A0 =C2=A0Clarifying the proposed r=
ules for use of the TE Opaque LSA or the Extended Link Opaque LSA without r=
elying on interpretations of 3630 will be helpful.=C2=A0 It will help the W=
G evaluate the proposal overall and determine what, if any, backwards compa=
tibility issues this proposal may cause with existing implementations.=C2=
=A0 It may also help future implementers avoid interoperability and backwar=
ds compatibility issues.<br>
<br>
As a concrete example, I think it would be useful to explicitly address the=
 case of how to advertise a link that only supports LDP in the text of the =
draft.=C2=A0 =C2=A0Below is an example of a format that would clarify this.=
=C2=A0 =C2=A0 From the response to my question below regarding LDP, I assum=
e that a link that only supports LDP signaling and not RSVP-signaling would=
 not be advertised in the TE Opaque LSA.=C2=A0 However, I am honestly not p=
ositive that this is what is intended.<br>
<br>
Format of proposed clarifying text:<br>
------------------<br>
<br>
A link MUST NOT be advertised in the TE Opaque LSA under the following cond=
itions:<br>
<br>
1) The link does not support RSVP-TE signaling.<br>
<br>
2) Another condition...<br>
<br>
A link MAY be advertised in the TE Opaque LSA under the following condition=
s:<br>
<br>
1) Another condition ...<br>
<br>
A link MUST NOT be advertised in the Extended Link Opaque LSA under the fol=
lowing conditions:<br>
<br>
1) Some other condition ....<br>
<span class=3D"im HOEnZb"><br>
Thanks,<br>
Chris<br>
<br>
<br>
<br>
-----Original Message-----<br>
From: Peter Psenak [mailto:<a href=3D"mailto:ppsenak@cisco.com">ppsenak@cis=
co.com</a>]<br>
</span><div class=3D"HOEnZb"><div class=3D"h5">Sent: Wednesday, October 21,=
 2015 3:24 PM<br>
To: Chris Bowers &lt;<a href=3D"mailto:cbowers@juniper.net">cbowers@juniper=
.net</a>&gt;; Acee Lindem (acee) &lt;<a href=3D"mailto:acee@cisco.com">acee=
@cisco.com</a>&gt;; Shraddha Hegde &lt;<a href=3D"mailto:shraddha@juniper.n=
et">shraddha@juniper.net</a>&gt;; OSPF WG List &lt;<a href=3D"mailto:ospf@i=
etf.org">ospf@ietf.org</a>&gt;<br>
Subject: Re: [OSPF] Regarding draft-ppsenak-ospf-te-link-attr-reuse-00<br>
<br>
Hi Chris,<br>
<br>
On 10/21/15 21:44 , Chris Bowers wrote:<br>
&gt; Peter,<br>
&gt;<br>
&gt; RFC3630 does not appear to restrict the use of the attributes it defin=
es.=C2=A0 =C2=A0The term &quot;TE extensions&quot; may seem to imply some r=
estriction, but the Applicability section of RFC3630 explicitly addresses t=
his potential interpretation by saying that a more accurate designation is =
&quot;extended link attributes&quot;.<br>
&gt;<br>
&gt; 1.1.=C2=A0 Applicability<br>
&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0Many of the extensions specified in this document a=
re in response to<br>
&gt;=C2=A0 =C2=A0 =C2=A0the requirements stated in [5], and thus are referr=
ed to as &quot;traffic<br>
&gt;=C2=A0 =C2=A0 =C2=A0engineering extensions&quot;, and are also commonly=
 associated with MPLS<br>
&gt;=C2=A0 =C2=A0 =C2=A0Traffic Engineering.=C2=A0 A more accurate (albeit =
bland) designation is<br>
&gt;=C2=A0 =C2=A0 =C2=A0&quot;extended link attributes&quot;, as the propos=
al is to simply add more<br>
&gt;=C2=A0 =C2=A0 =C2=A0attributes to links in OSPF advertisements.<br>
<br>
RFC3630 says:<br>
<br>
=C2=A0 =C2=A0 The extensions provide a way of describing the traffic engine=
ering<br>
=C2=A0 =C2=A0 topology (including bandwidth and administrative constraints)=
 and<br>
=C2=A0 =C2=A0 distributing this information within a given OSPF area.=C2=A0=
 This<br>
=C2=A0 =C2=A0 topology does not necessarily match the regular routed topolo=
gy,<br>
<br>
above clearly indicates that if the link is advertised in TE Opaque LSA, it=
 is part of the TE topology, otherwise it is not. That restricts the usage =
of the TE Opaque LSA to the links that are part of the TE topology.<br>
<br>
&gt;<br>
&gt; -------<br>
&gt; Also, the response below uses the term &quot;TE-enabled&quot; which al=
ong with &quot;TE-application&quot; does not appear to have a precise defin=
ition in draft-ppsenak-ospf-te-link-attr-reuse-00.=C2=A0 =C2=A0Based on RFC=
 3630, it seems reasonable to say that a link is &quot;TE-enabled&quot; if =
the link is advertised in the TE Opaque LSA.=C2=A0 I don&#39;t think this i=
s the meaning you intend, so to avoid confusion, I will use the term &quot;=
RFC-3630-TE-enabled&quot; to mean that the link is advertised in the TE Opa=
que LSA defined in RFC 3630.<br>
&gt;<br>
&gt; So can you clarify what &quot;TE-enabled&quot; or a &quot;TE-applicati=
on&quot; means in your document?=C2=A0 I assume that it should mean that MP=
LS is enabled, but it is actually not clear to me if just having LDP-enable=
d on a link would qualify as being &quot;TE-enabled&quot; or not.<br>
<br>
TE-enabled means the link is part of the traffic engineering topology as<br=
>
described by RFC3630.<br>
<br>
thanks,<br>
Peter<br>
<br>
&gt;<br>
&gt; Thanks,<br>
&gt; Chris<br>
&gt;<br>
&gt;<br>
&gt; -----Original Message-----<br>
&gt; From: Peter Psenak [mailto:<a href=3D"mailto:ppsenak@cisco.com">ppsena=
k@cisco.com</a>]<br>
&gt; Sent: Wednesday, October 21, 2015 12:40 PM<br>
&gt; To: Chris Bowers &lt;<a href=3D"mailto:cbowers@juniper.net">cbowers@ju=
niper.net</a>&gt;; Acee Lindem (acee) &lt;<a href=3D"mailto:acee@cisco.com"=
>acee@cisco.com</a>&gt;; Shraddha Hegde &lt;<a href=3D"mailto:shraddha@juni=
per.net">shraddha@juniper.net</a>&gt;; OSPF WG List &lt;<a href=3D"mailto:o=
spf@ietf.org">ospf@ietf.org</a>&gt;<br>
&gt; Subject: Re: [OSPF] Regarding draft-ppsenak-ospf-te-link-attr-reuse-00=
<br>
&gt;<br>
&gt; Hi Chris,<br>
&gt;<br>
&gt; On 10/21/15 19:20 , Chris Bowers wrote:<br>
&gt;&gt; In my opinion the backwards compatibility problems introduced by t=
his<br>
&gt;&gt; proposal outweigh potential gains.<br>
&gt;<br>
&gt; there is no backwards compatibility problem with the draft.<br>
&gt;<br>
&gt;&gt;<br>
&gt;&gt; As a concrete example, there is at least one existing implementati=
on<br>
&gt;&gt; of remote LFA where policy is used to select a backup tunnel that =
does<br>
&gt;&gt; not share an SRLG with the failed link.=C2=A0 This SRLG informatio=
n is<br>
&gt;&gt; carried in the TE Opaque LSA.<br>
&gt;<br>
&gt; that is fine, you are free to do that if the link is TE enabled, there=
 is no problem. If the link is not TE enabled and you use TE Opaque LSA to =
flood the SRLG data for such link, you are going against the current specif=
ication. There is no way to do that today, because any router that would re=
ceive such TE Opaque LSA must assume such link is TE enabled.<br>
&gt;<br>
&gt;&gt;<br>
&gt;&gt; As it currently reads, I think the proposal in<br>
&gt;&gt;=C2=A0 =C2=A0 draft-ppsenak-ospf-te-link-attr-reuse has the potenti=
al to break<br>
&gt;&gt; existing standards-compliant implementations.<br>
&gt;<br>
&gt; I don&#39;t believe so.<br>
&gt;<br>
&gt;&gt;<br>
&gt;&gt; I might be OK with having the proposal only apply to sub-TLVs=C2=
=A0 that<br>
&gt;&gt; get defined in the future.=C2=A0 However, I think that taking TLVs=
 that were<br>
&gt;&gt;=C2=A0 =C2=A0 standardized over ten years ago, and selectively movi=
ng them or<br>
&gt;&gt; copying them to a different LSA based on a set of rules that is<br=
>
&gt;&gt; subject to interpretation is going to create confusion and<br>
&gt;&gt; interoperability headaches.<br>
&gt;<br>
&gt; What we propose is the way to advertise link attributes without making=
 the link part of TE topology. We simply do not have a way to do that today=
. I do not see any problem in doing so, because we do not change anything o=
n the TE Opaque LSA side, we are defining something new.<br>
&gt;<br>
&gt; thanks,<br>
&gt; Peter<br>
&gt;<br>
&gt;&gt;<br>
&gt;&gt; Chris<br>
&gt;&gt;<br>
&gt;&gt; *From:*OSPF [mailto:<a href=3D"mailto:ospf-bounces@ietf.org">ospf-=
bounces@ietf.org</a>] *On Behalf Of *Acee Lindem<br>
&gt;&gt; (acee)<br>
&gt;&gt; *Sent:* Wednesday, October 21, 2015 6:48 AM<br>
&gt;&gt; *To:* Shraddha Hegde &lt;<a href=3D"mailto:shraddha@juniper.net">s=
hraddha@juniper.net</a>&gt;; OSPF WG List<br>
&gt;&gt; &lt;<a href=3D"mailto:ospf@ietf.org">ospf@ietf.org</a>&gt;<br>
&gt;&gt; *Subject:* Re: [OSPF] Regarding<br>
&gt;&gt; draft-ppsenak-ospf-te-link-attr-reuse-00<br>
&gt;&gt;<br>
&gt;&gt; Hi Shraddha,<br>
&gt;&gt;<br>
&gt;&gt; *From: *OSPF &lt;<a href=3D"mailto:ospf-bounces@ietf.org">ospf-bou=
nces@ietf.org</a> &lt;mailto:<a href=3D"mailto:ospf-bounces@ietf.org">ospf-=
bounces@ietf.org</a>&gt;&gt; on<br>
&gt;&gt; behalf of Shraddha Hegde &lt;<a href=3D"mailto:shraddha@juniper.ne=
t">shraddha@juniper.net</a><br>
&gt;&gt; &lt;mailto:<a href=3D"mailto:shraddha@juniper.net">shraddha@junipe=
r.net</a>&gt;&gt;<br>
&gt;&gt; *Date: *Wednesday, October 21, 2015 at 1:20 AM<br>
&gt;&gt; *To: *OSPF WG List &lt;<a href=3D"mailto:ospf@ietf.org">ospf@ietf.=
org</a> &lt;mailto:<a href=3D"mailto:ospf@ietf.org">ospf@ietf.org</a>&gt;&g=
t;<br>
&gt;&gt; *Subject: *[OSPF] Regarding draft-ppsenak-ospf-te-link-attr-reuse-=
00<br>
&gt;&gt;<br>
&gt;&gt;=C2=A0 =C2=A0 =C2=A0 Hi All,<br>
&gt;&gt;<br>
&gt;&gt;=C2=A0 =C2=A0 =C2=A0 draft-ppsenak-ospf-te-link-attr-reuse-00 propo=
ses moving and/or<br>
&gt;&gt;=C2=A0 =C2=A0 =C2=A0 copying TLVs from the TE Opaque LSA to the Ext=
ended Link Opaque LSA.<br>
&gt;&gt;=C2=A0 =C2=A0 =C2=A0 The draft lists the problems that the draft is=
 trying to solve.=C2=A0 I<br>
&gt;&gt;=C2=A0 =C2=A0 =C2=A0 have reproduced that list of problems below, w=
ith each problem<br>
&gt;&gt;=C2=A0 =C2=A0 =C2=A0 followed by what I believe to be a better and =
simpler solution.<br>
&gt;&gt;<br>
&gt;&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 1.=C2=A0 Whenever the link is ad=
vertised in a TE Opaque LSA, the<br>
&gt;&gt; link<br>
&gt;&gt;<br>
&gt;&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 becomes a part of =
the TE topology, which may not match IP<br>
&gt;&gt; routed<br>
&gt;&gt;<br>
&gt;&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 topology.=C2=A0 By=
 making the link part of the TE topology,<br>
&gt;&gt; remote<br>
&gt;&gt;<br>
&gt;&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 nodes may mistaken=
ly believe that the link is available<br>
&gt;&gt; for MPLS<br>
&gt;&gt;<br>
&gt;&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 TE or GMPLS, when,=
 in fact, MPLS is not enabled on the link.<br>
&gt;&gt;<br>
&gt;&gt;=C2=A0 =C2=A0 =C2=A0 To address this issue, we simply need to defin=
e a new sub-TLV in the<br>
&gt;&gt;=C2=A0 =C2=A0 =C2=A0 TE Link LSAto say whether MPLS/GMPLS/RSVP is e=
nabled on the link<br>
&gt;&gt;=C2=A0 =C2=A0 =C2=A0 instead of moving the TLVs around into differe=
nt LSAs.<br>
&gt;&gt;<br>
&gt;&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 2.=C2=A0 The TE Opaque LSA carri=
es link attributes that are not<br>
&gt;&gt; used or<br>
&gt;&gt;<br>
&gt;&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 required by MPLS T=
E or GMPLS.=C2=A0 There is no mechanism in TE<br>
&gt;&gt;=C2=A0 =C2=A0 =C2=A0 Opaque<br>
&gt;&gt;<br>
&gt;&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 LSA to indicate wh=
ich of the link attributes should be<br>
&gt;&gt; passed to<br>
&gt;&gt;<br>
&gt;&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 MPLS TE applicatio=
n and which should be used by OSPFv2 and<br>
&gt;&gt; other<br>
&gt;&gt;<br>
&gt;&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 applications.<br>
&gt;&gt;<br>
&gt;&gt;=C2=A0 =C2=A0 =C2=A0 OSPF database is a container and OSPF can use =
any of the LSAS for<br>
&gt;&gt;=C2=A0 =C2=A0 =C2=A0 its own use including the TE LSAs.As far as th=
e TE database goes, it<br>
&gt;&gt;=C2=A0 =C2=A0 =C2=A0 contains data from TE LSAs as well as non-TE L=
SAs (Network LSA)<br>
&gt;&gt;=C2=A0 =C2=A0 =C2=A0 today so thereasoning described here doesn&#39=
;t make sense.<br>
&gt;&gt;<br>
&gt;&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 3.=C2=A0 Link attributes used fo=
r non-TE purposes is partitioned<br>
&gt;&gt; across<br>
&gt;&gt;<br>
&gt;&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 multiple LSAs - th=
e TE Opaque LSA and the Extended Link<br>
&gt;&gt; Opaque<br>
&gt;&gt;<br>
&gt;&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 LSA.=C2=A0 This pa=
rtitioning will require implementations to<br>
&gt;&gt; lookup<br>
&gt;&gt;<br>
&gt;&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 multiple LSAs to e=
xtract link attributes for a single<br>
&gt;&gt; link,<br>
&gt;&gt;<br>
&gt;&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 bringing needless =
complexity to the OSPFv2 implementations.<br>
&gt;&gt;<br>
&gt;&gt;=C2=A0 =C2=A0 =C2=A0 There will be nodes in the network which will =
run older software<br>
&gt;&gt;=C2=A0 =C2=A0 =C2=A0 which send these attributes via TE LSAs so the=
 problem of looking<br>
&gt;&gt;=C2=A0 =C2=A0 =C2=A0 into the TE LSAs for TE relatedinformation doe=
sn&#39;t get solved with<br>
&gt;&gt;=C2=A0 =C2=A0 =C2=A0 this draft.=C2=A0 Rather it makes it more comp=
licated. With this draft,<br>
&gt;&gt;=C2=A0 =C2=A0 =C2=A0 the multiple LSA lookup will only increase.An =
implementation will<br>
&gt;&gt;=C2=A0 =C2=A0 =C2=A0 first have to find if Extended link LSA contai=
ns the required info,<br>
&gt;&gt;=C2=A0 =C2=A0 =C2=A0 if not it will need to lookup the info in TE.L=
SA.<br>
&gt;&gt;<br>
&gt;&gt; The applications using the TE parameters for non-TE use-cases will=
 use<br>
&gt;&gt; the OSPF Prefix/Link attributes for these use cases. Hence, there =
is<br>
&gt;&gt; no requirement to lookup the LSAs in multiple places. Backward<br>
&gt;&gt; compatibility will be covered in the specifications of these appli=
cations.<br>
&gt;&gt;<br>
&gt;&gt; Thanks,<br>
&gt;&gt;<br>
&gt;&gt; Acee<br>
&gt;&gt;<br>
&gt;&gt;=C2=A0 =C2=A0 =C2=A0 Looking up multiple LSAs for information is an=
 implementation issue<br>
&gt;&gt;=C2=A0 =C2=A0 =C2=A0 and I am sure there will be implementations th=
at will handle this<br>
&gt;&gt;=C2=A0 =C2=A0 =C2=A0 gracefully so that it doesn&#39;t cause<br>
&gt;&gt;<br>
&gt;&gt;=C2=A0 =C2=A0 =C2=A0 delays in critical paths. It doesn&#39;t seem =
reasonable to come up with<br>
&gt;&gt;=C2=A0 =C2=A0 =C2=A0 protocol extensions to solve implementation is=
sues.<br>
&gt;&gt;<br>
&gt;&gt;=C2=A0 =C2=A0 =C2=A0 Rgds<br>
&gt;&gt;<br>
&gt;&gt;=C2=A0 =C2=A0 =C2=A0 Shraddha<br>
&gt;&gt;<br>
&gt;&gt;<br>
&gt;&gt;<br>
&gt;&gt; _______________________________________________<br>
&gt;&gt; OSPF mailing list<br>
&gt;&gt; <a href=3D"mailto:OSPF@ietf.org">OSPF@ietf.org</a><br>
&gt;&gt; <a href=3D"https://www.ietf.org/mailman/listinfo/ospf" rel=3D"nore=
ferrer" target=3D"_blank">https://www.ietf.org/mailman/listinfo/ospf</a><br=
>
&gt;&gt;<br>
&gt;<br>
&gt; .<br>
&gt;<br>
<br>
_______________________________________________<br>
OSPF mailing list<br>
<a href=3D"mailto:OSPF@ietf.org">OSPF@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/ospf" rel=3D"noreferrer" t=
arget=3D"_blank">https://www.ietf.org/mailman/listinfo/ospf</a><br>
</div></div></blockquote></div><br></div>

--001a113ce9d8c994a40522b46ea0--


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Date: Thu, 22 Oct 2015 19:08:14 +0200
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Subject: Re: [OSPF] Regarding draft-ppsenak-ospf-te-link-attr-reuse-00
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Hi Alia,

please see inline:

On 10/22/15 19:00 , Alia Atlas wrote:
> <no-hat>
>
> The LFA and RLFA work both have the ability to use SRLG information, which
> has only been available in the TE Opaque LSA.  That's not been considered a
> problem.

it is a problem if the user does not want to use the link for MPLS 
traffic engineering. The reason is that any router receiving such TE 
Opaque LSA would automatically make the link part of the traffic 
engineering topology. RFC3630 clearly says that traffic engineering 
topology is described by TE Opaque LSAs and that such topology does not 
necessarily match the regular routed topology.

>
> The TE Opaque LSA would be, presumably, required if SPRING is supported
> which has no implications on whether RSVP-TE is enabled.

SPRING does not use TE Opaque LSA.

>
> My question is what does an assumption about being "TE-enabled" mean?

means that the link is part of the traffic engineering topology.

> What are the benefits of trying to change interpretations that have
> existed for
> at least 5+ years?

not sure what interpretation are you referring to, but RFC3630 is clear 
on what the TE Opaque LSAs are used for.

thanks,
Peter

>
> Regards,
> Alia
> </no-hat>
>
> On Thu, Oct 22, 2015 at 11:00 AM, Chris Bowers <cbowers@juniper.net
> <mailto:cbowers@juniper.net>> wrote:
>
>     Peter,
>
>     I would suggest making the text of the draft more explicit about the
>     conditions under which a given link and set of attributes should be
>     included in the TE Opaque LSA or the Extended Link Opaque LSA.
>     RFC3630 is subject to interpretation on its own, and since it was
>     written before the existence of the Extended Link Opaque LSA, it is
>     not self-evident how to interpret it with respect to using this new
>     LSA.   Clarifying the proposed rules for use of the TE Opaque LSA or
>     the Extended Link Opaque LSA without relying on interpretations of
>     3630 will be helpful.  It will help the WG evaluate the proposal
>     overall and determine what, if any, backwards compatibility issues
>     this proposal may cause with existing implementations.  It may also
>     help future implementers avoid interoperability and backwards
>     compatibility issues.
>
>     As a concrete example, I think it would be useful to explicitly
>     address the case of how to advertise a link that only supports LDP
>     in the text of the draft.   Below is an example of a format that
>     would clarify this.    From the response to my question below
>     regarding LDP, I assume that a link that only supports LDP signaling
>     and not RSVP-signaling would not be advertised in the TE Opaque
>     LSA.  However, I am honestly not positive that this is what is intended.
>
>     Format of proposed clarifying text:
>     ------------------
>
>     A link MUST NOT be advertised in the TE Opaque LSA under the
>     following conditions:
>
>     1) The link does not support RSVP-TE signaling.
>
>     2) Another condition...
>
>     A link MAY be advertised in the TE Opaque LSA under the following
>     conditions:
>
>     1) Another condition ...
>
>     A link MUST NOT be advertised in the Extended Link Opaque LSA under
>     the following conditions:
>
>     1) Some other condition ....
>
>     Thanks,
>     Chris
>
>
>
>     -----Original Message-----
>     From: Peter Psenak [mailto:ppsenak@cisco.com <mailto:ppsenak@cisco.com>]
>     Sent: Wednesday, October 21, 2015 3:24 PM
>     To: Chris Bowers <cbowers@juniper.net <mailto:cbowers@juniper.net>>;
>     Acee Lindem (acee) <acee@cisco.com <mailto:acee@cisco.com>>;
>     Shraddha Hegde <shraddha@juniper.net <mailto:shraddha@juniper.net>>;
>     OSPF WG List <ospf@ietf.org <mailto:ospf@ietf.org>>
>     Subject: Re: [OSPF] Regarding draft-ppsenak-ospf-te-link-attr-reuse-00
>
>     Hi Chris,
>
>     On 10/21/15 21:44 , Chris Bowers wrote:
>      > Peter,
>      >
>      > RFC3630 does not appear to restrict the use of the attributes it
>     defines.   The term "TE extensions" may seem to imply some
>     restriction, but the Applicability section of RFC3630 explicitly
>     addresses this potential interpretation by saying that a more
>     accurate designation is "extended link attributes".
>      >
>      > 1.1.  Applicability
>      >
>      >     Many of the extensions specified in this document are in
>     response to
>      >     the requirements stated in [5], and thus are referred to as
>     "traffic
>      >     engineering extensions", and are also commonly associated
>     with MPLS
>      >     Traffic Engineering.  A more accurate (albeit bland)
>     designation is
>      >     "extended link attributes", as the proposal is to simply add more
>      >     attributes to links in OSPF advertisements.
>
>     RFC3630 says:
>
>          The extensions provide a way of describing the traffic engineering
>          topology (including bandwidth and administrative constraints) and
>          distributing this information within a given OSPF area.  This
>          topology does not necessarily match the regular routed topology,
>
>     above clearly indicates that if the link is advertised in TE Opaque
>     LSA, it is part of the TE topology, otherwise it is not. That
>     restricts the usage of the TE Opaque LSA to the links that are part
>     of the TE topology.
>
>      >
>      > -------
>      > Also, the response below uses the term "TE-enabled" which along
>     with "TE-application" does not appear to have a precise definition
>     in draft-ppsenak-ospf-te-link-attr-reuse-00.   Based on RFC 3630, it
>     seems reasonable to say that a link is "TE-enabled" if the link is
>     advertised in the TE Opaque LSA.  I don't think this is the meaning
>     you intend, so to avoid confusion, I will use the term
>     "RFC-3630-TE-enabled" to mean that the link is advertised in the TE
>     Opaque LSA defined in RFC 3630.
>      >
>      > So can you clarify what "TE-enabled" or a "TE-application" means
>     in your document?  I assume that it should mean that MPLS is
>     enabled, but it is actually not clear to me if just having
>     LDP-enabled on a link would qualify as being "TE-enabled" or not.
>
>     TE-enabled means the link is part of the traffic engineering topology as
>     described by RFC3630.
>
>     thanks,
>     Peter
>
>      >
>      > Thanks,
>      > Chris
>      >
>      >
>      > -----Original Message-----
>      > From: Peter Psenak [mailto:ppsenak@cisco.com
>     <mailto:ppsenak@cisco.com>]
>      > Sent: Wednesday, October 21, 2015 12:40 PM
>      > To: Chris Bowers <cbowers@juniper.net
>     <mailto:cbowers@juniper.net>>; Acee Lindem (acee) <acee@cisco.com
>     <mailto:acee@cisco.com>>; Shraddha Hegde <shraddha@juniper.net
>     <mailto:shraddha@juniper.net>>; OSPF WG List <ospf@ietf.org
>     <mailto:ospf@ietf.org>>
>      > Subject: Re: [OSPF] Regarding
>     draft-ppsenak-ospf-te-link-attr-reuse-00
>      >
>      > Hi Chris,
>      >
>      > On 10/21/15 19:20 , Chris Bowers wrote:
>      >> In my opinion the backwards compatibility problems introduced by
>     this
>      >> proposal outweigh potential gains.
>      >
>      > there is no backwards compatibility problem with the draft.
>      >
>      >>
>      >> As a concrete example, there is at least one existing implementation
>      >> of remote LFA where policy is used to select a backup tunnel
>     that does
>      >> not share an SRLG with the failed link.  This SRLG information is
>      >> carried in the TE Opaque LSA.
>      >
>      > that is fine, you are free to do that if the link is TE enabled,
>     there is no problem. If the link is not TE enabled and you use TE
>     Opaque LSA to flood the SRLG data for such link, you are going
>     against the current specification. There is no way to do that today,
>     because any router that would receive such TE Opaque LSA must assume
>     such link is TE enabled.
>      >
>      >>
>      >> As it currently reads, I think the proposal in
>      >>    draft-ppsenak-ospf-te-link-attr-reuse has the potential to break
>      >> existing standards-compliant implementations.
>      >
>      > I don't believe so.
>      >
>      >>
>      >> I might be OK with having the proposal only apply to sub-TLVs  that
>      >> get defined in the future.  However, I think that taking TLVs
>     that were
>      >>    standardized over ten years ago, and selectively moving them or
>      >> copying them to a different LSA based on a set of rules that is
>      >> subject to interpretation is going to create confusion and
>      >> interoperability headaches.
>      >
>      > What we propose is the way to advertise link attributes without
>     making the link part of TE topology. We simply do not have a way to
>     do that today. I do not see any problem in doing so, because we do
>     not change anything on the TE Opaque LSA side, we are defining
>     something new.
>      >
>      > thanks,
>      > Peter
>      >
>      >>
>      >> Chris
>      >>
>      >> *From:*OSPF [mailto:ospf-bounces@ietf.org
>     <mailto:ospf-bounces@ietf.org>] *On Behalf Of *Acee Lindem
>      >> (acee)
>      >> *Sent:* Wednesday, October 21, 2015 6:48 AM
>      >> *To:* Shraddha Hegde <shraddha@juniper.net
>     <mailto:shraddha@juniper.net>>; OSPF WG List
>      >> <ospf@ietf.org <mailto:ospf@ietf.org>>
>      >> *Subject:* Re: [OSPF] Regarding
>      >> draft-ppsenak-ospf-te-link-attr-reuse-00
>      >>
>      >> Hi Shraddha,
>      >>
>      >> *From: *OSPF <ospf-bounces@ietf.org
>     <mailto:ospf-bounces@ietf.org> <mailto:ospf-bounces@ietf.org
>     <mailto:ospf-bounces@ietf.org>>> on
>      >> behalf of Shraddha Hegde <shraddha@juniper.net
>     <mailto:shraddha@juniper.net>
>      >> <mailto:shraddha@juniper.net <mailto:shraddha@juniper.net>>>
>      >> *Date: *Wednesday, October 21, 2015 at 1:20 AM
>      >> *To: *OSPF WG List <ospf@ietf.org <mailto:ospf@ietf.org>
>     <mailto:ospf@ietf.org <mailto:ospf@ietf.org>>>
>      >> *Subject: *[OSPF] Regarding draft-ppsenak-ospf-te-link-attr-reuse-00
>      >>
>      >>      Hi All,
>      >>
>      >>      draft-ppsenak-ospf-te-link-attr-reuse-00 proposes moving and/or
>      >>      copying TLVs from the TE Opaque LSA to the Extended Link
>     Opaque LSA.
>      >>      The draft lists the problems that the draft is trying to
>     solve.  I
>      >>      have reproduced that list of problems below, with each problem
>      >>      followed by what I believe to be a better and simpler solution.
>      >>
>      >>          1.  Whenever the link is advertised in a TE Opaque LSA, the
>      >> link
>      >>
>      >>              becomes a part of the TE topology, which may not
>     match IP
>      >> routed
>      >>
>      >>              topology.  By making the link part of the TE topology,
>      >> remote
>      >>
>      >>              nodes may mistakenly believe that the link is available
>      >> for MPLS
>      >>
>      >>              TE or GMPLS, when, in fact, MPLS is not enabled on
>     the link.
>      >>
>      >>      To address this issue, we simply need to define a new
>     sub-TLV in the
>      >>      TE Link LSAto say whether MPLS/GMPLS/RSVP is enabled on the
>     link
>      >>      instead of moving the TLVs around into different LSAs.
>      >>
>      >>          2.  The TE Opaque LSA carries link attributes that are not
>      >> used or
>      >>
>      >>              required by MPLS TE or GMPLS.  There is no
>     mechanism in TE
>      >>      Opaque
>      >>
>      >>              LSA to indicate which of the link attributes should be
>      >> passed to
>      >>
>      >>              MPLS TE application and which should be used by
>     OSPFv2 and
>      >> other
>      >>
>      >>              applications.
>      >>
>      >>      OSPF database is a container and OSPF can use any of the
>     LSAS for
>      >>      its own use including the TE LSAs.As far as the TE database
>     goes, it
>      >>      contains data from TE LSAs as well as non-TE LSAs (Network LSA)
>      >>      today so thereasoning described here doesn't make sense.
>      >>
>      >>          3.  Link attributes used for non-TE purposes is partitioned
>      >> across
>      >>
>      >>              multiple LSAs - the TE Opaque LSA and the Extended Link
>      >> Opaque
>      >>
>      >>              LSA.  This partitioning will require implementations to
>      >> lookup
>      >>
>      >>              multiple LSAs to extract link attributes for a single
>      >> link,
>      >>
>      >>              bringing needless complexity to the OSPFv2
>     implementations.
>      >>
>      >>      There will be nodes in the network which will run older
>     software
>      >>      which send these attributes via TE LSAs so the problem of
>     looking
>      >>      into the TE LSAs for TE relatedinformation doesn't get
>     solved with
>      >>      this draft.  Rather it makes it more complicated. With this
>     draft,
>      >>      the multiple LSA lookup will only increase.An
>     implementation will
>      >>      first have to find if Extended link LSA contains the
>     required info,
>      >>      if not it will need to lookup the info in TE.LSA.
>      >>
>      >> The applications using the TE parameters for non-TE use-cases
>     will use
>      >> the OSPF Prefix/Link attributes for these use cases. Hence, there is
>      >> no requirement to lookup the LSAs in multiple places. Backward
>      >> compatibility will be covered in the specifications of these
>     applications.
>      >>
>      >> Thanks,
>      >>
>      >> Acee
>      >>
>      >>      Looking up multiple LSAs for information is an
>     implementation issue
>      >>      and I am sure there will be implementations that will
>     handle this
>      >>      gracefully so that it doesn't cause
>      >>
>      >>      delays in critical paths. It doesn't seem reasonable to
>     come up with
>      >>      protocol extensions to solve implementation issues.
>      >>
>      >>      Rgds
>      >>
>      >>      Shraddha
>      >>
>      >>
>      >>
>      >> _______________________________________________
>      >> OSPF mailing list
>      >> OSPF@ietf.org <mailto:OSPF@ietf.org>
>      >> https://www.ietf.org/mailman/listinfo/ospf
>      >>
>      >
>      > .
>      >
>
>     _______________________________________________
>     OSPF mailing list
>     OSPF@ietf.org <mailto:OSPF@ietf.org>
>     https://www.ietf.org/mailman/listinfo/ospf
>
>


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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: "Acee Lindem (acee)" <acee@cisco.com>, OSPF WG List <ospf@ietf.org>
Thread-Topic: OSPF Operator-Defined TLVs (https://www.ietf.org/id/draft-chunduri-ospf-operator-defined-tlvs-01.txt)
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From nobody Thu Oct 22 18:46:31 2015
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Date: Fri, 23 Oct 2015 07:16:19 +0530
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From: Manav Bhatia <manavbhatia@gmail.com>
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Nothing from my side.

Thx, Manav

--
sent from a mobile device
On 23-Oct-2015 2:56 am, "Acee Lindem (acee)" <acee@cisco.com> wrote:

> Authors,
> Please indicate whether you are aware of any relevant IPR and if so,
> whether it has been disclosed.
> Thanks,
> Acee
>
> _______________________________________________
> OSPF mailing list
> OSPF@ietf.org
> https://www.ietf.org/mailman/listinfo/ospf
>

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<p dir=3D"ltr">Nothing from my side.</p>
<p dir=3D"ltr">Thx, Manav</p>
<p dir=3D"ltr">--<br>
sent from a mobile device</p>
<div class=3D"gmail_quote">On 23-Oct-2015 2:56 am, &quot;Acee Lindem (acee)=
&quot; &lt;<a href=3D"mailto:acee@cisco.com">acee@cisco.com</a>&gt; wrote:<=
br type=3D"attribution"><blockquote class=3D"gmail_quote" style=3D"margin:0=
 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Authors,<br>
Please indicate whether you are aware of any relevant IPR and if so,<br>
whether it has been disclosed.<br>
Thanks,<br>
Acee<br>
<br>
_______________________________________________<br>
OSPF mailing list<br>
<a href=3D"mailto:OSPF@ietf.org">OSPF@ietf.org</a><br>
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arget=3D"_blank">https://www.ietf.org/mailman/listinfo/ospf</a><br>
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Subject: Re: [OSPF] Regarding draft-ppsenak-ospf-te-link-attr-reuse-00
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Hi Chris,

please see inline:

On 10/22/15 17:00 , Chris Bowers wrote:
> Peter,
>
> I would suggest making the text of the draft more explicit about the conditions under which a given link and set of attributes should be included in the TE Opaque LSA or the Extended Link Opaque LSA.  RFC3630 is subject to interpretation on its own, and since it was written before the existence of the Extended Link Opaque LSA, it is not self-evident how to interpret it with respect to using this new LSA.   Clarifying the proposed rules for use of the TE Opaque LSA or the Extended Link Opaque LSA without relying on interpretations of 3630 will be helpful.  It will help the WG evaluate the proposal overall and determine what, if any, backwards compatibility issues this proposal may cause with existing implementations.  It may also help future implementers avoid interoperability and backwards compatibility issues.

Sure, we can add more text in the draft.

What I have a problem with is that you are questioning RFC3630 and claim 
that it subject to interpretation. I don't think that is the case. 
RFC3630 defines TE Opaque LSAs as a mechanism to describe TE topology. 
There is nothing left that is subject to interpretation. If we do not 
have an agreement on this part, there is no text in the draft that is 
going to make things clear.


>
> As a concrete example, I think it would be useful to explicitly address the case of how to advertise a link that only supports LDP in the text of the draft.   Below is an example of a format that would clarify this.    From the response to my question below regarding LDP, I assume that a link that only supports LDP signaling and not RSVP-signaling would not be advertised in the TE Opaque LSA.  However, I am honestly not positive that this is what is intended.

LDP being enabled on link is orthogonal to link being part of the TE 
topology. Implementation can choose what makes link part of TE topology, 
some may have explicit command on a per interface basis, some may do it 
based on some other feature being enabled on the link. No matter what 
mechanism they use it is a local decision on the box that makes the link 
part of TE topology and triggers the advertisement of the TE Opaque LSA 
for such link. What is important is that as soon as the TE Opaque LSA is 
flooded all other nodes in the area will assume they can use such link 
for traffic engineering and use it during the TE cSPF.

>
> Format of proposed clarifying text:
> ------------------
>
> A link MUST NOT be advertised in the TE Opaque LSA under the following conditions:
>
> 1) The link does not support RSVP-TE signaling.

one can do traffic engineering without RSVP. RFC3630 does not mandate 
the usage of RSVP.

>
> 2) Another condition...
>
> A link MAY be advertised in the TE Opaque LSA under the following conditions:

the only condition is that user decided to make the link part of the 
traffic engineering topology, regardless of what is the local mechanism 
on the box to make that happen.

>
> 1) Another condition ...
>
> A link MUST NOT be advertised in the Extended Link Opaque LSA under the following conditions:

I do not see any reason to specify why a link MUST NOT be advertised in 
Extended Link Opaque LSA.

TE Opaque LSA and Extended Link Opaque LSA are orthogonal to each other. 
TE Opaque LSA is dedicated for traffic engineering and must not be used 
for anything else.

thanks,
Peter

>
> 1) Some other condition ....
>
> Thanks,
> Chris
>
>
>
> -----Original Message-----
> From: Peter Psenak [mailto:ppsenak@cisco.com]
> Sent: Wednesday, October 21, 2015 3:24 PM
> To: Chris Bowers <cbowers@juniper.net>; Acee Lindem (acee) <acee@cisco.com>; Shraddha Hegde <shraddha@juniper.net>; OSPF WG List <ospf@ietf.org>
> Subject: Re: [OSPF] Regarding draft-ppsenak-ospf-te-link-attr-reuse-00
>
> Hi Chris,
>
> On 10/21/15 21:44 , Chris Bowers wrote:
>> Peter,
>>
>> RFC3630 does not appear to restrict the use of the attributes it defines.   The term "TE extensions" may seem to imply some restriction, but the Applicability section of RFC3630 explicitly addresses this potential interpretation by saying that a more accurate designation is "extended link attributes".
>>
>> 1.1.  Applicability
>>
>>      Many of the extensions specified in this document are in response to
>>      the requirements stated in [5], and thus are referred to as "traffic
>>      engineering extensions", and are also commonly associated with MPLS
>>      Traffic Engineering.  A more accurate (albeit bland) designation is
>>      "extended link attributes", as the proposal is to simply add more
>>      attributes to links in OSPF advertisements.
>
> RFC3630 says:
>
>      The extensions provide a way of describing the traffic engineering
>      topology (including bandwidth and administrative constraints) and
>      distributing this information within a given OSPF area.  This
>      topology does not necessarily match the regular routed topology,
>
> above clearly indicates that if the link is advertised in TE Opaque LSA, it is part of the TE topology, otherwise it is not. That restricts the usage of the TE Opaque LSA to the links that are part of the TE topology.
>
>>
>> -------
>> Also, the response below uses the term "TE-enabled" which along with "TE-application" does not appear to have a precise definition in draft-ppsenak-ospf-te-link-attr-reuse-00.   Based on RFC 3630, it seems reasonable to say that a link is "TE-enabled" if the link is advertised in the TE Opaque LSA.  I don't think this is the meaning you intend, so to avoid confusion, I will use the term "RFC-3630-TE-enabled" to mean that the link is advertised in the TE Opaque LSA defined in RFC 3630.
>>
>> So can you clarify what "TE-enabled" or a "TE-application" means in your document?  I assume that it should mean that MPLS is enabled, but it is actually not clear to me if just having LDP-enabled on a link would qualify as being "TE-enabled" or not.
>
> TE-enabled means the link is part of the traffic engineering topology as
> described by RFC3630.
>
> thanks,
> Peter
>
>>
>> Thanks,
>> Chris
>>
>>
>> -----Original Message-----
>> From: Peter Psenak [mailto:ppsenak@cisco.com]
>> Sent: Wednesday, October 21, 2015 12:40 PM
>> To: Chris Bowers <cbowers@juniper.net>; Acee Lindem (acee) <acee@cisco.com>; Shraddha Hegde <shraddha@juniper.net>; OSPF WG List <ospf@ietf.org>
>> Subject: Re: [OSPF] Regarding draft-ppsenak-ospf-te-link-attr-reuse-00
>>
>> Hi Chris,
>>
>> On 10/21/15 19:20 , Chris Bowers wrote:
>>> In my opinion the backwards compatibility problems introduced by this
>>> proposal outweigh potential gains.
>>
>> there is no backwards compatibility problem with the draft.
>>
>>>
>>> As a concrete example, there is at least one existing implementation
>>> of remote LFA where policy is used to select a backup tunnel that does
>>> not share an SRLG with the failed link.  This SRLG information is
>>> carried in the TE Opaque LSA.
>>
>> that is fine, you are free to do that if the link is TE enabled, there is no problem. If the link is not TE enabled and you use TE Opaque LSA to flood the SRLG data for such link, you are going against the current specification. There is no way to do that today, because any router that would receive such TE Opaque LSA must assume such link is TE enabled.
>>
>>>
>>> As it currently reads, I think the proposal in
>>>     draft-ppsenak-ospf-te-link-attr-reuse has the potential to break
>>> existing standards-compliant implementations.
>>
>> I don't believe so.
>>
>>>
>>> I might be OK with having the proposal only apply to sub-TLVs  that
>>> get defined in the future.  However, I think that taking TLVs that were
>>>     standardized over ten years ago, and selectively moving them or
>>> copying them to a different LSA based on a set of rules that is
>>> subject to interpretation is going to create confusion and
>>> interoperability headaches.
>>
>> What we propose is the way to advertise link attributes without making the link part of TE topology. We simply do not have a way to do that today. I do not see any problem in doing so, because we do not change anything on the TE Opaque LSA side, we are defining something new.
>>
>> thanks,
>> Peter
>>
>>>
>>> Chris
>>>
>>> *From:*OSPF [mailto:ospf-bounces@ietf.org] *On Behalf Of *Acee Lindem
>>> (acee)
>>> *Sent:* Wednesday, October 21, 2015 6:48 AM
>>> *To:* Shraddha Hegde <shraddha@juniper.net>; OSPF WG List
>>> <ospf@ietf.org>
>>> *Subject:* Re: [OSPF] Regarding
>>> draft-ppsenak-ospf-te-link-attr-reuse-00
>>>
>>> Hi Shraddha,
>>>
>>> *From: *OSPF <ospf-bounces@ietf.org <mailto:ospf-bounces@ietf.org>> on
>>> behalf of Shraddha Hegde <shraddha@juniper.net
>>> <mailto:shraddha@juniper.net>>
>>> *Date: *Wednesday, October 21, 2015 at 1:20 AM
>>> *To: *OSPF WG List <ospf@ietf.org <mailto:ospf@ietf.org>>
>>> *Subject: *[OSPF] Regarding draft-ppsenak-ospf-te-link-attr-reuse-00
>>>
>>>       Hi All,
>>>
>>>       draft-ppsenak-ospf-te-link-attr-reuse-00 proposes moving and/or
>>>       copying TLVs from the TE Opaque LSA to the Extended Link Opaque LSA.
>>>       The draft lists the problems that the draft is trying to solve.  I
>>>       have reproduced that list of problems below, with each problem
>>>       followed by what I believe to be a better and simpler solution.
>>>
>>>           1.  Whenever the link is advertised in a TE Opaque LSA, the
>>> link
>>>
>>>               becomes a part of the TE topology, which may not match IP
>>> routed
>>>
>>>               topology.  By making the link part of the TE topology,
>>> remote
>>>
>>>               nodes may mistakenly believe that the link is available
>>> for MPLS
>>>
>>>               TE or GMPLS, when, in fact, MPLS is not enabled on the link.
>>>
>>>       To address this issue, we simply need to define a new sub-TLV in the
>>>       TE Link LSAto say whether MPLS/GMPLS/RSVP is enabled on the link
>>>       instead of moving the TLVs around into different LSAs.
>>>
>>>           2.  The TE Opaque LSA carries link attributes that are not
>>> used or
>>>
>>>               required by MPLS TE or GMPLS.  There is no mechanism in TE
>>>       Opaque
>>>
>>>               LSA to indicate which of the link attributes should be
>>> passed to
>>>
>>>               MPLS TE application and which should be used by OSPFv2 and
>>> other
>>>
>>>               applications.
>>>
>>>       OSPF database is a container and OSPF can use any of the LSAS for
>>>       its own use including the TE LSAs.As far as the TE database goes, it
>>>       contains data from TE LSAs as well as non-TE LSAs (Network LSA)
>>>       today so thereasoning described here doesn't make sense.
>>>
>>>           3.  Link attributes used for non-TE purposes is partitioned
>>> across
>>>
>>>               multiple LSAs - the TE Opaque LSA and the Extended Link
>>> Opaque
>>>
>>>               LSA.  This partitioning will require implementations to
>>> lookup
>>>
>>>               multiple LSAs to extract link attributes for a single
>>> link,
>>>
>>>               bringing needless complexity to the OSPFv2 implementations.
>>>
>>>       There will be nodes in the network which will run older software
>>>       which send these attributes via TE LSAs so the problem of looking
>>>       into the TE LSAs for TE relatedinformation doesn't get solved with
>>>       this draft.  Rather it makes it more complicated. With this draft,
>>>       the multiple LSA lookup will only increase.An implementation will
>>>       first have to find if Extended link LSA contains the required info,
>>>       if not it will need to lookup the info in TE.LSA.
>>>
>>> The applications using the TE parameters for non-TE use-cases will use
>>> the OSPF Prefix/Link attributes for these use cases. Hence, there is
>>> no requirement to lookup the LSAs in multiple places. Backward
>>> compatibility will be covered in the specifications of these applications.
>>>
>>> Thanks,
>>>
>>> Acee
>>>
>>>       Looking up multiple LSAs for information is an implementation issue
>>>       and I am sure there will be implementations that will handle this
>>>       gracefully so that it doesn't cause
>>>
>>>       delays in critical paths. It doesn't seem reasonable to come up with
>>>       protocol extensions to solve implementation issues.
>>>
>>>       Rgds
>>>
>>>       Shraddha
>>>
>>>
>>>
>>> _______________________________________________
>>> OSPF mailing list
>>> OSPF@ietf.org
>>> https://www.ietf.org/mailman/listinfo/ospf
>>>
>>
>> .
>>
>
> .
>


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To: Shraddha Hegde <shraddha@juniper.net>, "Black, David" <david.black@emc.com>, The IESG <iesg@ietf.org>
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From: Benoit Claise <bclaise@cisco.com>
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Date: Fri, 23 Oct 2015 10:37:48 +0200
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Subject: Re: [OSPF] Benoit Claise's No Objection on draft-ietf-ospf-node-admin-tag-07: (with COMMENT)
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Thanks, Benoit
> David/Ben,
>
> Pls see in-line
>
> Rgds
> shraddha
>
> -----Original Message-----
> From: Black, David [mailto:david.black@emc.com]
> Sent: Monday, October 12, 2015 7:09 PM
> To: Benoit Claise <bclaise@cisco.com>; The IESG <iesg@ietf.org>
> Cc: acee@cisco.com; draft-ietf-ospf-node-admin-tag.ad@ietf.org; draft-ietf-ospf-node-admin-tag.shepherd@ietf.org; draft-ietf-ospf-node-admin-tag@ietf.org; ospf-chairs@ietf.org; ospf@ietf.org; Black, David <david.black@emc.com>
> Subject: RE: Benoit Claise's No Objection on draft-ietf-ospf-node-admin-tag-07: (with COMMENT)
>
> Benoit,
>
>> I was initially confused by that sentence.
> My understanding is that "independent characteristics" applies on a tag-by-tag basis.  I might suggest:
>
> 	Each tag carried by the administrative tag TLV SHOULD be used to
> 	indicate a characteristic of a node that is independent of the
> 	characteristics indicated by other administrative tags.
> <Shraddha> Thanks for the text. Updating -08 version with above text.
>
> Thanks,
> --David
>
>
>> -----Original Message-----
>> From: Benoit Claise [mailto:bclaise@cisco.com]
>> Sent: Monday, October 12, 2015 9:34 AM
>> To: The IESG
>> Cc: Black, David; acee@cisco.com;
>> draft-ietf-ospf-node-admin-tag.ad@ietf.org;
>> draft-ietf-ospf-node-admin-tag.shepherd@ietf.org;
>> draft-ietf-ospf-node-admin- tag@ietf.org; ospf-chairs@ietf.org;
>> ospf@ietf.org
>> Subject: Benoit Claise's No Objection on draft-ietf-ospf-node-admin-tag-07:
>> (with COMMENT)
>>
>> Benoit Claise has entered the following ballot position for
>> draft-ietf-ospf-node-admin-tag-07: No Objection
>>
>> When responding, please keep the subject line intact and reply to all
>> email addresses included in the To and CC lines. (Feel free to cut
>> this introductory paragraph, however.)
>>
>>
>> Please refer to
>> https://www.ietf.org/iesg/statement/discuss-criteria.html
>> for more information about IESG DISCUSS and COMMENT positions.
>>
>>
>> The document, along with other ballot positions, can be found here:
>> https://datatracker.ietf.org/doc/draft-ietf-ospf-node-admin-tag/
>>
>>
>>
>> ----------------------------------------------------------------------
>> COMMENT:
>> ----------------------------------------------------------------------
>>
>> - "Tags carried by the
>>     administrative tag TLV SHOULD be used to indicate independent
>>     characteristics of a node."
>>
>> I was initially confused by that sentence.
>> So there are tags carried by a different TLV than the administrative one?
>> Actually, no (I checked with one of the authors).
>> I would simply write:
>>     "Administrative tag TLV SHOULD be used to indicate independent
>>     characteristics of a node."
>>
>> This would be in line with the definition:
>>     An administrative Tag is a 32-bit integer value that can be used to
>>     identify a group of nodes in the OSPF domain.
>>
>> - Router information LSA [RFC4970] can have link, area or AS
>>     level flooding scope.  Choosing the flooding scope to flood the group
>>     tags are defined by the policies and is a local matter.
>>
>> "and is a local matter". Hopefully there is some sort of centralized
>> management application that checks consistency.
>>


From nobody Fri Oct 23 07:31:32 2015
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From: "Carlos Pignataro (cpignata)" <cpignata@cisco.com>
To: "Acee Lindem (acee)" <acee@cisco.com>
Thread-Topic: IPR Poll for "OSPF extensions to advertise S-BFD Target Discriminator" - draft-ietf-ospf-sbfd-discriminator-02 
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Subject: Re: [OSPF] IPR Poll for "OSPF extensions to advertise S-BFD Target Discriminator" - draft-ietf-ospf-sbfd-discriminator-02
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Hi, Acee,

I am not aware of any IPR relevant to this document.

In other words, no change since:
https://www.ietf.org/mail-archive/web/ospf/current/msg07172.html =
<https://www.ietf.org/mail-archive/web/ospf/current/msg07172.html>
https://www.ietf.org/mail-archive/web/ospf/current/msg07590.html =
<https://www.ietf.org/mail-archive/web/ospf/current/msg07590.html>

Thanks!

=E2=80=94 Carlos.

> On Oct 22, 2015, at 5:25 PM, Acee Lindem (acee) <acee@cisco.com> =
wrote:
>=20
> Authors,
> Please indicate whether you are aware of any relevant IPR and if so,
> whether it has been disclosed.
> Thanks,
> Acee
>=20


--Apple-Mail=_752C8997-2B79-47D2-A0A9-60313A0A6528
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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D"">Hi, Acee,<div class=3D""><br class=3D""></div><div class=3D"">I=
 am not aware of any IPR relevant to this document.</div><div =
class=3D""><br class=3D""></div><div class=3D"">In other words, no =
change since:</div><div class=3D""><a =
href=3D"https://www.ietf.org/mail-archive/web/ospf/current/msg07172.html" =
class=3D"">https://www.ietf.org/mail-archive/web/ospf/current/msg07172.htm=
l</a></div><div class=3D""><a =
href=3D"https://www.ietf.org/mail-archive/web/ospf/current/msg07590.html" =
class=3D"">https://www.ietf.org/mail-archive/web/ospf/current/msg07590.htm=
l</a></div><div class=3D""><br class=3D""></div><div =
class=3D"">Thanks!</div><div class=3D""><br class=3D""></div><div =
class=3D"">=E2=80=94 Carlos.</div><div class=3D""><br =
class=3D""><div><blockquote type=3D"cite" class=3D""><div class=3D"">On =
Oct 22, 2015, at 5:25 PM, Acee Lindem (acee) &lt;<a =
href=3D"mailto:acee@cisco.com" class=3D"">acee@cisco.com</a>&gt; =
wrote:</div><br class=3D"Apple-interchange-newline"><div class=3D""><div =
class=3D"">Authors,<br class=3D"">Please indicate whether you are aware =
of any relevant IPR and if so,<br class=3D"">whether it has been =
disclosed.<br class=3D"">Thanks,<br class=3D"">Acee <br class=3D""><br =
class=3D""></div></div></blockquote></div><br =
class=3D""></div></body></html>=

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From: "Acee Lindem (acee)" <acee@cisco.com>
To: "Carlos Pignataro (cpignata)" <cpignata@cisco.com>
Thread-Topic: IPR Poll for "OSPF extensions to advertise S-BFD Target Discriminator" - draft-ietf-ospf-sbfd-discriminator-02
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Subject: Re: [OSPF] IPR Poll for "OSPF extensions to advertise S-BFD Target Discriminator" - draft-ietf-ospf-sbfd-discriminator-02
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From: "Acee Lindem (acee)" <acee@cisco.com>
To: "Peter Psenak (ppsenak)" <ppsenak@cisco.com>, Alia Atlas <akatlas@gmail.com>, Chris Bowers <cbowers@juniper.net>
Thread-Topic: [OSPF] Regarding draft-ppsenak-ospf-te-link-attr-reuse-00
Thread-Index: AQHRC/ZPFuY7qCnGR1+q4c+BrPcEhJ519m0AgABAsgCAAA+BEIAAHj+AgAEl3ZCAAId6gIAAAigAgAS8qAA=
Date: Sun, 25 Oct 2015 21:28:04 +0000
Message-ID: <D252C136.384AC%acee@cisco.com>
References: <D24CF2B7.37452%acee@cisco.com> <BLUPR05MB292E9628E4172C733C59BA8A9380@BLUPR05MB292.namprd05.prod.outlook.com> <5627CDF6.605@cisco.com> <BLUPR05MB292B99DA8B1B9E253A0E83BA9380@BLUPR05MB292.namprd05.prod.outlook.com> <5627F457.8020701@cisco.com> <BLUPR05MB2927E888C41831AF2786280A9270@BLUPR05MB292.namprd05.prod.outlook.com> <CAG4d1rctdk6QcrhjEj2n-1VM2HTzQJvFxgamneis+fsiH0rcTw@mail.gmail.com> <562917FE.6070100@cisco.com>
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Subject: Re: [OSPF] Regarding draft-ppsenak-ospf-te-link-attr-reuse-00
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To: "draft-ietf-ospf-sbfd-discriminator@ietf.org" <draft-ietf-ospf-sbfd-discriminator@ietf.org>, "Alvaro Retana (aretana)" <aretana@cisco.com>
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From: "Acee Lindem (acee)" <acee@cisco.com>
To: "draft-ietf-ospf-ospfv2-hbit@ietf.org" <draft-ietf-ospf-ospfv2-hbit@ietf.org>
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From: "Acee Lindem (acee)" <acee@cisco.com>
To: "draft-ietf-ospf-link-overload@ietf.org" <draft-ietf-ospf-link-overload@ietf.org>
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From: Jeff Tantsura <jeff.tantsura@ericsson.com>
To: "Acee Lindem (acee)" <acee@cisco.com>
Thread-Topic: [OSPF] Regarding draft-ppsenak-ospf-te-link-attr-reuse-00
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Date: Mon, 26 Oct 2015 01:01:54 +0000
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References: <D24CF2B7.37452%acee@cisco.com> <BLUPR05MB292E9628E4172C733C59BA8A9380@BLUPR05MB292.namprd05.prod.outlook.com> <5627CDF6.605@cisco.com> <BLUPR05MB292B99DA8B1B9E253A0E83BA9380@BLUPR05MB292.namprd05.prod.outlook.com> <5627F457.8020701@cisco.com> <BLUPR05MB2927E888C41831AF2786280A9270@BLUPR05MB292.namprd05.prod.outlook.com> <CAG4d1rctdk6QcrhjEj2n-1VM2HTzQJvFxgamneis+fsiH0rcTw@mail.gmail.com> <562917FE.6070100@cisco.com>,<D252C136.384AC%acee@cisco.com>
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Subject: Re: [OSPF] Regarding draft-ppsenak-ospf-te-link-attr-reuse-00
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Hi,
No hats

I'm familiar with at least 2 implementations which have this issue, this dr=
aft solves real problem.

Regards,
Jeff

> On Oct 25, 2015, at 2:28 PM, Acee Lindem (acee) <acee@cisco.com> wrote:
>=20
> Speaking with no hats on=85
>=20
> I just want to add that we have a separate OSPF metric and OSPF TE Metric
> so the mere fact that there is a similar object in GMPLS doesn=92t imply
> that it automatically is applicable to IP applications as well.
>=20
> Thanks,
> Acee=20
>=20
>> On 10/22/15, 1:08 PM, "Peter Psenak (ppsenak)" <ppsenak@cisco.com> wrote=
:
>>=20
>> Hi Alia,
>>=20
>> please see inline:
>>=20
>>> On 10/22/15 19:00 , Alia Atlas wrote:
>>> <no-hat>
>>>=20
>>> The LFA and RLFA work both have the ability to use SRLG information,
>>> which
>>> has only been available in the TE Opaque LSA.  That's not been
>>> considered a
>>> problem.
>>=20
>> it is a problem if the user does not want to use the link for MPLS
>> traffic engineering. The reason is that any router receiving such TE
>> Opaque LSA would automatically make the link part of the traffic
>> engineering topology. RFC3630 clearly says that traffic engineering
>> topology is described by TE Opaque LSAs and that such topology does not
>> necessarily match the regular routed topology.
>>=20
>>>=20
>>> The TE Opaque LSA would be, presumably, required if SPRING is supported
>>> which has no implications on whether RSVP-TE is enabled.
>>=20
>> SPRING does not use TE Opaque LSA.
>>=20
>>>=20
>>> My question is what does an assumption about being "TE-enabled" mean?
>>=20
>> means that the link is part of the traffic engineering topology.
>>=20
>>> What are the benefits of trying to change interpretations that have
>>> existed for
>>> at least 5+ years?
>>=20
>> not sure what interpretation are you referring to, but RFC3630 is clear
>> on what the TE Opaque LSAs are used for.
>>=20
>> thanks,
>> Peter
>>=20
>>>=20
>>> Regards,
>>> Alia
>>> </no-hat>
>>>=20
>>> On Thu, Oct 22, 2015 at 11:00 AM, Chris Bowers <cbowers@juniper.net
>>> <mailto:cbowers@juniper.net>> wrote:
>>>=20
>>>    Peter,
>>>=20
>>>    I would suggest making the text of the draft more explicit about the
>>>    conditions under which a given link and set of attributes should be
>>>    included in the TE Opaque LSA or the Extended Link Opaque LSA.
>>>    RFC3630 is subject to interpretation on its own, and since it was
>>>    written before the existence of the Extended Link Opaque LSA, it is
>>>    not self-evident how to interpret it with respect to using this new
>>>    LSA.   Clarifying the proposed rules for use of the TE Opaque LSA or
>>>    the Extended Link Opaque LSA without relying on interpretations of
>>>    3630 will be helpful.  It will help the WG evaluate the proposal
>>>    overall and determine what, if any, backwards compatibility issues
>>>    this proposal may cause with existing implementations.  It may also
>>>    help future implementers avoid interoperability and backwards
>>>    compatibility issues.
>>>=20
>>>    As a concrete example, I think it would be useful to explicitly
>>>    address the case of how to advertise a link that only supports LDP
>>>    in the text of the draft.   Below is an example of a format that
>>>    would clarify this.    From the response to my question below
>>>    regarding LDP, I assume that a link that only supports LDP signaling
>>>    and not RSVP-signaling would not be advertised in the TE Opaque
>>>    LSA.  However, I am honestly not positive that this is what is
>>> intended.
>>>=20
>>>    Format of proposed clarifying text:
>>>    ------------------
>>>=20
>>>    A link MUST NOT be advertised in the TE Opaque LSA under the
>>>    following conditions:
>>>=20
>>>    1) The link does not support RSVP-TE signaling.
>>>=20
>>>    2) Another condition...
>>>=20
>>>    A link MAY be advertised in the TE Opaque LSA under the following
>>>    conditions:
>>>=20
>>>    1) Another condition ...
>>>=20
>>>    A link MUST NOT be advertised in the Extended Link Opaque LSA under
>>>    the following conditions:
>>>=20
>>>    1) Some other condition ....
>>>=20
>>>    Thanks,
>>>    Chris
>>>=20
>>>=20
>>>=20
>>>    -----Original Message-----
>>>    From: Peter Psenak [mailto:ppsenak@cisco.com
>>> <mailto:ppsenak@cisco.com>]
>>>    Sent: Wednesday, October 21, 2015 3:24 PM
>>>    To: Chris Bowers <cbowers@juniper.net <mailto:cbowers@juniper.net>>;
>>>    Acee Lindem (acee) <acee@cisco.com <mailto:acee@cisco.com>>;
>>>    Shraddha Hegde <shraddha@juniper.net <mailto:shraddha@juniper.net>>;
>>>    OSPF WG List <ospf@ietf.org <mailto:ospf@ietf.org>>
>>>    Subject: Re: [OSPF] Regarding
>>> draft-ppsenak-ospf-te-link-attr-reuse-00
>>>=20
>>>    Hi Chris,
>>>=20
>>>>    On 10/21/15 21:44 , Chris Bowers wrote:
>>>> Peter,
>>>>=20
>>>> RFC3630 does not appear to restrict the use of the attributes it
>>>    defines.   The term "TE extensions" may seem to imply some
>>>    restriction, but the Applicability section of RFC3630 explicitly
>>>    addresses this potential interpretation by saying that a more
>>>    accurate designation is "extended link attributes".
>>>>=20
>>>> 1.1.  Applicability
>>>>=20
>>>>    Many of the extensions specified in this document are in
>>>    response to
>>>>    the requirements stated in [5], and thus are referred to as
>>>    "traffic
>>>>    engineering extensions", and are also commonly associated
>>>    with MPLS
>>>>    Traffic Engineering.  A more accurate (albeit bland)
>>>    designation is
>>>>    "extended link attributes", as the proposal is to simply add
>>> more
>>>>    attributes to links in OSPF advertisements.
>>>=20
>>>    RFC3630 says:
>>>=20
>>>         The extensions provide a way of describing the traffic
>>> engineering
>>>         topology (including bandwidth and administrative constraints)
>>> and
>>>         distributing this information within a given OSPF area.  This
>>>         topology does not necessarily match the regular routed
>>> topology,
>>>=20
>>>    above clearly indicates that if the link is advertised in TE Opaque
>>>    LSA, it is part of the TE topology, otherwise it is not. That
>>>    restricts the usage of the TE Opaque LSA to the links that are part
>>>    of the TE topology.
>>>=20
>>>>=20
>>>> -------
>>>> Also, the response below uses the term "TE-enabled" which along
>>>    with "TE-application" does not appear to have a precise definition
>>>    in draft-ppsenak-ospf-te-link-attr-reuse-00.   Based on RFC 3630, it
>>>    seems reasonable to say that a link is "TE-enabled" if the link is
>>>    advertised in the TE Opaque LSA.  I don't think this is the meaning
>>>    you intend, so to avoid confusion, I will use the term
>>>    "RFC-3630-TE-enabled" to mean that the link is advertised in the TE
>>>    Opaque LSA defined in RFC 3630.
>>>>=20
>>>> So can you clarify what "TE-enabled" or a "TE-application" means
>>>    in your document?  I assume that it should mean that MPLS is
>>>    enabled, but it is actually not clear to me if just having
>>>    LDP-enabled on a link would qualify as being "TE-enabled" or not.
>>>=20
>>>    TE-enabled means the link is part of the traffic engineering
>>> topology as
>>>    described by RFC3630.
>>>=20
>>>    thanks,
>>>    Peter
>>>=20
>>>>=20
>>>> Thanks,
>>>> Chris
>>>>=20
>>>>=20
>>>> -----Original Message-----
>>>> From: Peter Psenak [mailto:ppsenak@cisco.com
>>>    <mailto:ppsenak@cisco.com>]
>>>> Sent: Wednesday, October 21, 2015 12:40 PM
>>>> To: Chris Bowers <cbowers@juniper.net
>>>    <mailto:cbowers@juniper.net>>; Acee Lindem (acee) <acee@cisco.com
>>>    <mailto:acee@cisco.com>>; Shraddha Hegde <shraddha@juniper.net
>>>    <mailto:shraddha@juniper.net>>; OSPF WG List <ospf@ietf.org
>>>    <mailto:ospf@ietf.org>>
>>>> Subject: Re: [OSPF] Regarding
>>>    draft-ppsenak-ospf-te-link-attr-reuse-00
>>>>=20
>>>> Hi Chris,
>>>>=20
>>>>> On 10/21/15 19:20 , Chris Bowers wrote:
>>>>> In my opinion the backwards compatibility problems introduced by
>>>    this
>>>>> proposal outweigh potential gains.
>>>>=20
>>>> there is no backwards compatibility problem with the draft.
>>>>=20
>>>>>=20
>>>>> As a concrete example, there is at least one existing
>>> implementation
>>>>> of remote LFA where policy is used to select a backup tunnel
>>>    that does
>>>>> not share an SRLG with the failed link.  This SRLG information
>>> is
>>>>> carried in the TE Opaque LSA.
>>>>=20
>>>> that is fine, you are free to do that if the link is TE enabled,
>>>    there is no problem. If the link is not TE enabled and you use TE
>>>    Opaque LSA to flood the SRLG data for such link, you are going
>>>    against the current specification. There is no way to do that today,
>>>    because any router that would receive such TE Opaque LSA must assume
>>>    such link is TE enabled.
>>>>=20
>>>>>=20
>>>>> As it currently reads, I think the proposal in
>>>>>   draft-ppsenak-ospf-te-link-attr-reuse has the potential to
>>> break
>>>>> existing standards-compliant implementations.
>>>>=20
>>>> I don't believe so.
>>>>=20
>>>>>=20
>>>>> I might be OK with having the proposal only apply to sub-TLVs
>>> that
>>>>> get defined in the future.  However, I think that taking TLVs
>>>    that were
>>>>>   standardized over ten years ago, and selectively moving them
>>> or
>>>>> copying them to a different LSA based on a set of rules that is
>>>>> subject to interpretation is going to create confusion and
>>>>> interoperability headaches.
>>>>=20
>>>> What we propose is the way to advertise link attributes without
>>>    making the link part of TE topology. We simply do not have a way to
>>>    do that today. I do not see any problem in doing so, because we do
>>>    not change anything on the TE Opaque LSA side, we are defining
>>>    something new.
>>>>=20
>>>> thanks,
>>>> Peter
>>>>=20
>>>>>=20
>>>>> Chris
>>>>>=20
>>>>> *From:*OSPF [mailto:ospf-bounces@ietf.org
>>>    <mailto:ospf-bounces@ietf.org>] *On Behalf Of *Acee Lindem
>>>>> (acee)
>>>>> *Sent:* Wednesday, October 21, 2015 6:48 AM
>>>>> *To:* Shraddha Hegde <shraddha@juniper.net
>>>    <mailto:shraddha@juniper.net>>; OSPF WG List
>>>>> <ospf@ietf.org <mailto:ospf@ietf.org>>
>>>>> *Subject:* Re: [OSPF] Regarding
>>>>> draft-ppsenak-ospf-te-link-attr-reuse-00
>>>>>=20
>>>>> Hi Shraddha,
>>>>>=20
>>>>> *From: *OSPF <ospf-bounces@ietf.org
>>>    <mailto:ospf-bounces@ietf.org> <mailto:ospf-bounces@ietf.org
>>>    <mailto:ospf-bounces@ietf.org>>> on
>>>>> behalf of Shraddha Hegde <shraddha@juniper.net
>>>    <mailto:shraddha@juniper.net>
>>>>> <mailto:shraddha@juniper.net <mailto:shraddha@juniper.net>>>
>>>>> *Date: *Wednesday, October 21, 2015 at 1:20 AM
>>>>> *To: *OSPF WG List <ospf@ietf.org <mailto:ospf@ietf.org>
>>>    <mailto:ospf@ietf.org <mailto:ospf@ietf.org>>>
>>>>> *Subject: *[OSPF] Regarding
>>> draft-ppsenak-ospf-te-link-attr-reuse-00
>>>>>=20
>>>>>     Hi All,
>>>>>=20
>>>>>     draft-ppsenak-ospf-te-link-attr-reuse-00 proposes moving
>>> and/or
>>>>>     copying TLVs from the TE Opaque LSA to the Extended Link
>>>    Opaque LSA.
>>>>>     The draft lists the problems that the draft is trying to
>>>    solve.  I
>>>>>     have reproduced that list of problems below, with each
>>> problem
>>>>>     followed by what I believe to be a better and simpler
>>> solution.
>>>>>=20
>>>>>         1.  Whenever the link is advertised in a TE Opaque
>>> LSA, the
>>>>> link
>>>>>=20
>>>>>             becomes a part of the TE topology, which may not
>>>    match IP
>>>>> routed
>>>>>=20
>>>>>             topology.  By making the link part of the TE
>>> topology,
>>>>> remote
>>>>>=20
>>>>>             nodes may mistakenly believe that the link is
>>> available
>>>>> for MPLS
>>>>>=20
>>>>>             TE or GMPLS, when, in fact, MPLS is not enabled on
>>>    the link.
>>>>>=20
>>>>>     To address this issue, we simply need to define a new
>>>    sub-TLV in the
>>>>>     TE Link LSAto say whether MPLS/GMPLS/RSVP is enabled on the
>>>    link
>>>>>     instead of moving the TLVs around into different LSAs.
>>>>>=20
>>>>>         2.  The TE Opaque LSA carries link attributes that are
>>> not
>>>>> used or
>>>>>=20
>>>>>             required by MPLS TE or GMPLS.  There is no
>>>    mechanism in TE
>>>>>     Opaque
>>>>>=20
>>>>>             LSA to indicate which of the link attributes
>>> should be
>>>>> passed to
>>>>>=20
>>>>>             MPLS TE application and which should be used by
>>>    OSPFv2 and
>>>>> other
>>>>>=20
>>>>>             applications.
>>>>>=20
>>>>>     OSPF database is a container and OSPF can use any of the
>>>    LSAS for
>>>>>     its own use including the TE LSAs.As far as the TE database
>>>    goes, it
>>>>>     contains data from TE LSAs as well as non-TE LSAs (Network
>>> LSA)
>>>>>     today so thereasoning described here doesn't make sense.
>>>>>=20
>>>>>         3.  Link attributes used for non-TE purposes is
>>> partitioned
>>>>> across
>>>>>=20
>>>>>             multiple LSAs - the TE Opaque LSA and the Extended
>>> Link
>>>>> Opaque
>>>>>=20
>>>>>             LSA.  This partitioning will require
>>> implementations to
>>>>> lookup
>>>>>=20
>>>>>             multiple LSAs to extract link attributes for a
>>> single
>>>>> link,
>>>>>=20
>>>>>             bringing needless complexity to the OSPFv2
>>>    implementations.
>>>>>=20
>>>>>     There will be nodes in the network which will run older
>>>    software
>>>>>     which send these attributes via TE LSAs so the problem of
>>>    looking
>>>>>     into the TE LSAs for TE relatedinformation doesn't get
>>>    solved with
>>>>>     this draft.  Rather it makes it more complicated. With this
>>>    draft,
>>>>>     the multiple LSA lookup will only increase.An
>>>    implementation will
>>>>>     first have to find if Extended link LSA contains the
>>>    required info,
>>>>>     if not it will need to lookup the info in TE.LSA.
>>>>>=20
>>>>> The applications using the TE parameters for non-TE use-cases
>>>    will use
>>>>> the OSPF Prefix/Link attributes for these use cases. Hence,
>>> there is
>>>>> no requirement to lookup the LSAs in multiple places. Backward
>>>>> compatibility will be covered in the specifications of these
>>>    applications.
>>>>>=20
>>>>> Thanks,
>>>>>=20
>>>>> Acee
>>>>>=20
>>>>>     Looking up multiple LSAs for information is an
>>>    implementation issue
>>>>>     and I am sure there will be implementations that will
>>>    handle this
>>>>>     gracefully so that it doesn't cause
>>>>>=20
>>>>>     delays in critical paths. It doesn't seem reasonable to
>>>    come up with
>>>>>     protocol extensions to solve implementation issues.
>>>>>=20
>>>>>     Rgds
>>>>>=20
>>>>>     Shraddha
>>>>>=20
>>>>>=20
>>>>>=20
>>>>> _______________________________________________
>>>>> OSPF mailing list
>>>>> OSPF@ietf.org <mailto:OSPF@ietf.org>
>>>>> https://www.ietf.org/mailman/listinfo/ospf
>>>>=20
>>>> .
>>>=20
>>>    _______________________________________________
>>>    OSPF mailing list
>>>    OSPF@ietf.org <mailto:OSPF@ietf.org>
>>>    https://www.ietf.org/mailman/listinfo/ospf
>=20
> _______________________________________________
> OSPF mailing list
> OSPF@ietf.org
> https://www.ietf.org/mailman/listinfo/ospf


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From: "Wunan (Eric)" <eric.wu@huawei.com>
To: "Acee Lindem (acee)" <acee@cisco.com>
Thread-Topic: IPR Poll on "OSPF Extensions for Flow Specification" 
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Subject: Re: [OSPF] IPR Poll on "OSPF Extensions for Flow Specification"
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To: "Acee Lindem (acee)" <acee@cisco.com>, "draft-ietf-ospf-flowspec-extensions@ietf.org" <draft-ietf-ospf-flowspec-extensions@ietf.org>
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Subject: Re: [OSPF] IPR Poll on "OSPF Extensions for Flow Specification"
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From: LUIS MIGUEL CONTRERAS MURILLO <luismiguel.contrerasmurillo@telefonica.com>
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From: Xuxiaohu <xuxiaohu@huawei.com>
To: "Acee Lindem (acee)" <acee@cisco.com>, "draft-ietf-ospf-encapsulation-cap@ietf.org" <draft-ietf-ospf-encapsulation-cap@ietf.org>
Thread-Topic: IPR Poll on "Advertising Tunnelling Capability in OSPF"
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Date: Tue, 27 Oct 2015 01:31:35 +0000
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Subject: Re: [OSPF] IPR Poll on "Advertising Tunnelling Capability in OSPF"
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From nobody Mon Oct 26 20:39:04 2015
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From: Xuxiaohu <xuxiaohu@huawei.com>
To: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, "Acee Lindem (acee)" <acee@cisco.com>, OSPF WG List <ospf@ietf.org>
Thread-Topic: OSPF Operator-Defined TLVs (https://www.ietf.org/id/draft-chunduri-ospf-operator-defined-tlvs-01.txt)
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Date: Tue, 27 Oct 2015 03:38:50 +0000
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From: <mohamed.boucadair@orange.com>
To: "Acee Lindem (acee)" <acee@cisco.com>, OSPF WG List <ospf@ietf.org>
Thread-Topic: OSPF Operator-Defined TLVs (https://www.ietf.org/id/draft-chunduri-ospf-operator-defined-tlvs-01.txt)
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To: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, "Acee Lindem (acee)" <acee@cisco.com>, OSPF WG List <ospf@ietf.org>
Thread-Topic: OSPF Operator-Defined TLVs (https://www.ietf.org/id/draft-chunduri-ospf-operator-defined-tlvs-01.txt)
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Subject: Re: [OSPF] OSPF Operator-Defined TLVs (https://www.ietf.org/id/draft-chunduri-ospf-operator-defined-tlvs-01.txt)
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Date: Tue, 27 Oct 2015 17:02:12 +0800
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From: "Fan, Peng" <fanp08@gmail.com>
To: "Acee Lindem (acee)" <acee@cisco.com>
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I am not aware of any relevant IPR (as co-author).

Best regards,
Peng

2015-10-26 18:00 GMT+08:00 Acee Lindem (acee) <acee@cisco.com>:

> Speaking as a co-author, I am not aware of any relevant IPR.
>
> Thanks,
> Acee
>
> On 10/25/15, 8:20 PM, "Acee Lindem (acee)" <acee@cisco.com> wrote:
>
> >Authors,
> >Please indicate whether you are aware of any relevant IPR and if so,
> >whether it has been disclosed.
> >Thanks,
> >Acee
> >
> >
>
> _______________________________________________
> OSPF mailing list
> OSPF@ietf.org
> https://www.ietf.org/mailman/listinfo/ospf
>

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<div dir=3D"ltr">I am not aware of any relevant IPR (as co-author).<div><br=
></div><div>Best regards,</div><div>Peng</div></div><div class=3D"gmail_ext=
ra"><br><div class=3D"gmail_quote">2015-10-26 18:00 GMT+08:00 Acee Lindem (=
acee) <span dir=3D"ltr">&lt;<a href=3D"mailto:acee@cisco.com" target=3D"_bl=
ank">acee@cisco.com</a>&gt;</span>:<br><blockquote class=3D"gmail_quote" st=
yle=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Speak=
ing as a co-author, I am not aware of any relevant IPR.<br>
<br>
Thanks,<br>
Acee<br>
<div class=3D"HOEnZb"><div class=3D"h5"><br>
On 10/25/15, 8:20 PM, &quot;Acee Lindem (acee)&quot; &lt;<a href=3D"mailto:=
acee@cisco.com">acee@cisco.com</a>&gt; wrote:<br>
<br>
&gt;Authors,<br>
&gt;Please indicate whether you are aware of any relevant IPR and if so,<br=
>
&gt;whether it has been disclosed.<br>
&gt;Thanks,<br>
&gt;Acee<br>
&gt;<br>
&gt;<br>
<br>
_______________________________________________<br>
OSPF mailing list<br>
<a href=3D"mailto:OSPF@ietf.org">OSPF@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/ospf" rel=3D"noreferrer" t=
arget=3D"_blank">https://www.ietf.org/mailman/listinfo/ospf</a><br>
</div></div></blockquote></div><br></div>

--001a114739a46a9aee052312551c--


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Not aware of any IPRs relevant to this work.

--
Uma C.

-----Original Message-----
From: OSPF [mailto:ospf-bounces@ietf.org] On Behalf Of Acee Lindem (acee)
Sent: Sunday, October 25, 2015 5:18 PM
To: draft-ietf-ospf-encapsulation-cap@ietf.org
Cc: OSPF WG List
Subject: [OSPF] IPR Poll on "Advertising Tunnelling Capability in OSPF"

Authors,
Please indicate whether you are aware of any relevant IPR and if so, whethe=
r it has been disclosed.
Thanks,
Acee


_______________________________________________
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OSPF@ietf.org
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From: Luay Jalil <luayjalil@gmail.com>
To: "Acee Lindem (acee)" <acee@cisco.com>
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Subject: Re: [OSPF] IPR Poll on "Advertising Tunnelling Capability in OSPF"
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--001a1134fb0acde2f505231b104a
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I'm not aware of any relevant IPR

Regards,
Luay

On Sun, Oct 25, 2015 at 7:18 PM, Acee Lindem (acee) <acee@cisco.com> wrote:

> Authors,
> Please indicate whether you are aware of any relevant IPR and if so,
> whether it has been disclosed.
> Thanks,
> Acee
>
>
> _______________________________________________
> OSPF mailing list
> OSPF@ietf.org
> https://www.ietf.org/mailman/listinfo/ospf
>



-- 
*Luay*

--001a1134fb0acde2f505231b104a
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<div dir=3D"ltr"><span style=3D"font-size:12.8px">I&#39;m not aware of any =
relevant IPR</span><br><div><span style=3D"font-size:12.8px"><br></span></d=
iv><div><span style=3D"font-size:12.8px">Regards,</span></div><div><span st=
yle=3D"font-size:12.8px">Luay</span></div></div><div class=3D"gmail_extra">=
<br><div class=3D"gmail_quote">On Sun, Oct 25, 2015 at 7:18 PM, Acee Lindem=
 (acee) <span dir=3D"ltr">&lt;<a href=3D"mailto:acee@cisco.com" target=3D"_=
blank">acee@cisco.com</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_q=
uote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1e=
x">Authors,<br>
Please indicate whether you are aware of any relevant IPR and if so,<br>
whether it has been disclosed.<br>
Thanks,<br>
Acee<br>
<br>
<br>
_______________________________________________<br>
OSPF mailing list<br>
<a href=3D"mailto:OSPF@ietf.org">OSPF@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/ospf" rel=3D"noreferrer" t=
arget=3D"_blank">https://www.ietf.org/mailman/listinfo/ospf</a><br>
</blockquote></div><br><br clear=3D"all"><div><br></div>-- <br><div class=
=3D"gmail_signature"><strong>Luay</strong></div>
</div>

--001a1134fb0acde2f505231b104a--


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Date: Tue, 27 Oct 2015 14:28:54 -0500
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From: Luay Jalil <luayjalil@gmail.com>
To: "Acee Lindem (acee)" <acee@cisco.com>
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Subject: Re: [OSPF] IPR Poll on "OSPF Link Overload"
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--089e0160b770a644e305231b16f7
Content-Type: text/plain; charset=UTF-8

I'm not aware of any relevant IPR

Regards,
Luay

On Sun, Oct 25, 2015 at 7:16 PM, Acee Lindem (acee) <acee@cisco.com> wrote:

> Authors,
> Please indicate whether you are aware of any relevant IPR and if so,
> whether it has been disclosed.
> Thanks,
> Acee
>
> _______________________________________________
> OSPF mailing list
> OSPF@ietf.org
> https://www.ietf.org/mailman/listinfo/ospf
>



-- 
*Luay*

--089e0160b770a644e305231b16f7
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><span style=3D"font-size:12.8px">I&#39;m not aware of any =
relevant IPR</span><br><div><span style=3D"font-size:12.8px"><br></span></d=
iv><div><span style=3D"font-size:12.8px">Regards,</span></div><div><span st=
yle=3D"font-size:12.8px">Luay</span></div></div><div class=3D"gmail_extra">=
<br><div class=3D"gmail_quote">On Sun, Oct 25, 2015 at 7:16 PM, Acee Lindem=
 (acee) <span dir=3D"ltr">&lt;<a href=3D"mailto:acee@cisco.com" target=3D"_=
blank">acee@cisco.com</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_q=
uote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1e=
x">Authors,<br>
Please indicate whether you are aware of any relevant IPR and if so,<br>
whether it has been disclosed.<br>
Thanks,<br>
Acee<br>
<br>
_______________________________________________<br>
OSPF mailing list<br>
<a href=3D"mailto:OSPF@ietf.org">OSPF@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/ospf" rel=3D"noreferrer" t=
arget=3D"_blank">https://www.ietf.org/mailman/listinfo/ospf</a><br>
</blockquote></div><br><br clear=3D"all"><div><br></div>-- <br><div class=
=3D"gmail_signature"><strong>Luay</strong></div>
</div>

--089e0160b770a644e305231b16f7--


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From: <bruno.decraene@orange.com>
To: "Acee Lindem (acee)" <acee@cisco.com>
Thread-Topic: IPR Poll on "Advertising Tunnelling Capability in OSPF"
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To: "mohamed.boucadair@orange.com" <mohamed.boucadair@orange.com>, "Acee Lindem (acee)" <acee@cisco.com>, OSPF WG List <ospf@ietf.org>
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Subject: Re: [OSPF] OSPF Operator-Defined TLVs (https://www.ietf.org/id/draft-chunduri-ospf-operator-defined-tlvs-01.txt)
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From: Shraddha Hegde <shraddha@juniper.net>
To: "Acee Lindem (acee)" <acee@cisco.com>, "draft-ietf-ospf-link-overload@ietf.org" <draft-ietf-ospf-link-overload@ietf.org>
Thread-Topic: IPR Poll on "OSPF Link Overload" 
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Subject: Re: [OSPF] IPR Poll on "OSPF Link Overload"
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From nobody Wed Oct 28 07:23:29 2015
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From: <mohamed.boucadair@orange.com>
To: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, "Acee Lindem (acee)" <acee@cisco.com>, OSPF WG List <ospf@ietf.org>
Thread-Topic: OSPF Operator-Defined TLVs (https://www.ietf.org/id/draft-chunduri-ospf-operator-defined-tlvs-01.txt)
Thread-Index: AQHRCqzYT+PSKWZbDkygrQxSvdVsap538ayAgAcBl7CAASJxcIAA6PXA
Date: Wed, 28 Oct 2015 14:23:22 +0000
Message-ID: <787AE7BB302AE849A7480A190F8B933008C8896D@OPEXCLILMA3.corporate.adroot.infra.ftgroup>
References: <D24ACB18.36F88%acee@cisco.com> <1a3c0c41dfef4808aa02c34762bcbff1@XCH-ALN-001.cisco.com> <787AE7BB302AE849A7480A190F8B933008C87A3A@OPEXCLILMA3.corporate.adroot.infra.ftgroup> <6d54006a312844d5a749ec5cd7fd3fdc@XCH-ALN-001.cisco.com>
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Subject: Re: [OSPF] OSPF Operator-Defined TLVs (https://www.ietf.org/id/draft-chunduri-ospf-operator-defined-tlvs-01.txt)
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From: "Acee Lindem (acee)" <acee@cisco.com>
To: "mohamed.boucadair@orange.com" <mohamed.boucadair@orange.com>, "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, OSPF WG List <ospf@ietf.org>
Thread-Topic: OSPF Operator-Defined TLVs (https://www.ietf.org/id/draft-chunduri-ospf-operator-defined-tlvs-01.txt)
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Date: Wed, 28 Oct 2015 19:17:03 +0000
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References: <D24ACB18.36F88%acee@cisco.com> <1a3c0c41dfef4808aa02c34762bcbff1@XCH-ALN-001.cisco.com> <787AE7BB302AE849A7480A190F8B933008C87A3A@OPEXCLILMA3.corporate.adroot.infra.ftgroup> <6d54006a312844d5a749ec5cd7fd3fdc@XCH-ALN-001.cisco.com> <787AE7BB302AE849A7480A190F8B933008C8896D@OPEXCLILMA3.corporate.adroot.infra.ftgroup>
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Subject: Re: [OSPF] OSPF Operator-Defined TLVs (https://www.ietf.org/id/draft-chunduri-ospf-operator-defined-tlvs-01.txt)
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From nobody Sat Oct 31 01:03:05 2015
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From: IETF Secretariat <ietf-ipr@ietf.org>
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Subject: [OSPF] IPR Disclosure  Huawei Technologies Co., Ltd's Statement about IPR related to draft-ietf-ospf-ttz
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Dear Huaimo Chen, Renwei Li, Gregory Cauchie, Alvaro Retana, Ning So, Vic Liu, Mehmet Toy, Lei Liu:


An IPR disclosure that pertains to your Internet-Draft entitled "OSPF
Topology-Transparent Zone" (draft-ietf-ospf-ttz) was submitted to the IETF
Secretariat on  and has been posted on the "IETF Page of Intellectual Property
Rights Disclosures" (https://datatracker.ietf.org/ipr/2701/). The title of the
IPR disclosure is " Huawei Technologies Co.,Ltd's Statement about IPR
related to draft-ietf-ospf-ttz"


Thank you

IETF Secretariat


From nobody Sat Oct 31 02:33:33 2015
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