Shraddha –
RSVP-TE has been deployed for many years and the separation of RSVP enablement
from link attribute advertisements has never been required or done.
What is true today is that implementations use the presence of link attribute
advertisements to infer that RSVP is enabled on a link. The problem detailed in
Figure 1 of your draft demonstrates that implementations do not agree on what
specific sub-TLV is required to indicate RSVP enablement. The TE-APP draft
resolves this issue by indicating whether link attribute advertisements are to
be used by RSVP-TE – but it deliberately does NOT change the existing model of
requiring at least one link attribute advertisement in order to infer RSVP
enablement. This resolves the interoperability issue but does so in a way which
is far less disruptive than what you propose.
You are suggesting that there is a use case for RSVP in the absence of any link
attribute advertisements and that the lack of this separate signaling is
causing a significant problem in networks today. This flies in the face of
existing deployments – and is certainly not backwards compatible with anyone’s
shipping code today. I have discussed this issue with several RSVP-TE experts
over the last several months and none of them has identified this as a problem
which needs to be solved.
Les
From: Isis-wg [mailto:[email protected]] On Behalf Of Shraddha Hegde
Sent: Friday, October 13, 2017 6:27 AM
To: Sami Boutros <[email protected]>; [email protected]
Cc: [email protected]; [email protected]
Subject: Re: [Isis-wg] WG Adoption poll for draft-hegde-isis-advertising-te-
protocols
Hi Sami,
Its better to keep protocol enabled/disabled information decoupled from the
“Application Specific Link Attributes sub-TLV”
Its useful to advertise RSVP enabled/disabled on a link so the head-end
nodes/controllers can use this
Information instead of depending on non-standard mechanisms. IMO, this was
needed many years ago.
It’s not a good idea to couple protocol enablement with application specific
attribute because application specific link attribute sub-tlv may not be
generated in
Deployments which do not need the feature.
Rgds
Shraddha
From: Isis-wg [mailto:[email protected]] On Behalf Of Sami Boutros
Sent: Friday, October 13, 2017 3:28 AM
To: [email protected]<mailto:[email protected]>
Cc: [email protected]<mailto:[email protected]>;
[email protected]<mailto:[email protected]>
Subject: Re: [Isis-wg] WG Adoption poll for draft-hegde-isis-advertising-te-
protocols
Given the revised text in
https://www.ietf.org/id/draft-ietf-isis-te-app-01.txt<https://urldefense.proofpoint.com/v2/url?u=https-3A__www.ietf.org_id_draft-2Dietf-2Disis-2Dte-2Dapp-2D01.txt&d=DwMGaQ&c=HAkYuh63rsuhr6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&r=NyjLsr7JA7mvpCJa0YmPdVKcmMXJ31bpbBaNqzCNrng&m=O3GcMwU3QHS_s751vPoxv6s2QIFlHDtuCKgDkkLm1Ww&s=CF38fJHuqwjP1LD6okjaSYbMcohxwD8LDuiyYCR-sO8&e=>
section 6, is this draft still needed?
Thanks,
Sami
-----Original Message-----
From: Isis-wg [mailto:[email protected]] On Behalf Of Christian
Hopps
Sent: Friday, October 06, 2017 7:43 PM
To: [email protected]<mailto:[email protected]>
Cc: [email protected]<mailto:[email protected]>;
[email protected]<mailto:[email protected]>;
draft-hegde-isis-advertising-te- [email protected]<mailto:[email protected]>
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=DwICAg&
c=HAkYuh63rsuhr6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&r=CRB2tJiQePk0cT-h5LGhEW
H-s_xXXup3HzvBSMRj5VE&m=pi7-8Xzsmi8d3us4xv6ifujYP0pPLIcRTajhGlNZ8is&s=
Mnizs5neSNoKSzC8H0U29uTdEqyFGiOCAMNdGzpJ9YY&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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