Re: [Isis-wg] WG Adoption poll for draft-hegde-isis-advertising-te-protocols

Shraddha Hegde <shraddha@juniper.net> Fri, 13 October 2017 13:49 UTC

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From: Shraddha Hegde <shraddha@juniper.net>
To: "stephane.litkowski@orange.com" <stephane.litkowski@orange.com>, "draft-hegde-isis-advertising-te-protocols@ietf.org" <draft-hegde-isis-advertising-te-protocols@ietf.org>, "isis-wg@ietf.org" <isis-wg@ietf.org>
Thread-Topic: [Isis-wg] WG Adoption poll for draft-hegde-isis-advertising-te-protocols
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Date: Fri, 13 Oct 2017 13:49:01 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/isis-wg/6Qkp9PKYflA8XEXaZ2hYMClvHU8>
Subject: Re: [Isis-wg] WG Adoption poll for draft-hegde-isis-advertising-te-protocols
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Stephane,

In certain cases MPLS forwarding may not be supported on some legacy linecards.
Since these links should be used for IP forwarding IGPs will advertise these links.
It is better to have explicit indication of this rather than use absence of adjacency-sid on the link.

With the new SR flag, while the SPF and the SR-Path does not change, there is an indication
To the controller and head-end nodes that the links cannot do SR-MPLS forwarding.
The controller or head-end implementations may have mechanisms to prevent pulling
Traffic on SR paths. When Head-end node detects a prefix-sid path going through such incapable links
It may skip installing SR paths for such prefix-SID and implementations may decide to use other 
mechanisms (such as RSVP or IP) at the head-end which would prevent
Traffic loss.

This is also a useful tool during transition to SR when  certain links should avoid carrying SR traffic due to operational
reasons.

Rgds
Shraddha

-----Original Message-----
From: stephane.litkowski@orange.com [mailto:stephane.litkowski@orange.com] 
Sent: Thursday, October 12, 2017 4:03 PM
To: draft-hegde-isis-advertising-te-protocols@ietf.org; isis-wg@ietf.org
Subject: RE: [Isis-wg] WG Adoption poll for draft-hegde-isis-advertising-te-protocols

Hi Authors,

One question, why do you think it is really needed to introduce the SR flag ? Couldn't it be deduced from the presence of an Adj-SID and the SR router cap ?
The SR flag unset while the router supports SR looks strange to me. Why do you want to prevent "SR forwarding" on a link if the node supports SR ?

" With this information, a centralized
   application can decide to use a different path for that traffic by
   using a different label stack."
In such a case, the usage of a Node-SID may be complex, as the Node-SID may cross a link with the SR flag unset. This will force the controller to use Adj-SIDs only. 
If the controller uses only Adj-SIDs, then an implementation can allow the user to prevent the advertisement of Adj-SIDs on a particular link.

Could you clarify the use case here ?


Thanks,



-----Original Message-----
From: Isis-wg [mailto:isis-wg-bounces@ietf.org] On Behalf Of Christian Hopps
Sent: Saturday, October 07, 2017 04:43
To: isis-wg@ietf.org
Cc: isis-chairs@ietf.org; isis-ads@ietf.org; draft-hegde-isis-advertising-te-protocols@ietf.org
Subject: [Isis-wg] WG Adoption poll for draft-hegde-isis-advertising-te-protocols

Hi Folks,

The authors have requested the IS-IS WG adopt

    https://urldefense.proofpoint.com/v2/url?u=https-3A__datatracker.ietf.org_doc_draft-2Dhegde-2Disis-2Dadvertising-2Dte-2Dprotocols_&d=DwIFAg&c=HAkYuh63rsuhr6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&r=NyjLsr7JA7mvpCJa0YmPdVKcmMXJ31bpbBaNqzCNrng&m=C2KWg-TNJXOgV_qiX8ZDhjjJW6rn3GhpPaBzHTDjqZ0&s=lHsxN1TAflKdy5QZ1sKRfmprtswYQGOljhQpvPNoJkE&e=

as a working group document. Please indicate your support or no-support for taking on this work.

Authors: Please indicate your knowledge of any IPR related to this work to the list as well.

Thanks,
Chris & Hannes.

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