>I do not think this is a practical approach to apply after a FRR application.
+1, in term of operations, I would say that incremental metric would be applicable only for maintenance and may not for outages De : Pierre Francois [mailto:[email protected]] Envoyé : jeudi 31 octobre 2013 17:04 À : Alia Atlas Cc : LITKOWSKI Stephane DTF/DERX; [email protected]; Zhangxudong (zhangxudong, VRP); Yangang Objet : Re: Soliciting WG feedback and comments on draft-zxd-rtgwg-ordered-metric-adjustment-00 Alia, Some corner cases here and there, but yes, Francois' code (Francois Clad, not me) computes these sequences in a ridiculously low amount of time, and the sequences tend to be very short even in large topologies. I still think this should be investigated for maintenance cases and metric updates stemming out of a TE exercise. I do not think this is a practical approach to apply after a FRR application. Cheers, Pierre. On Oct 31, 2013, at 4:54 PM, Alia Atlas <[email protected]<mailto:[email protected]>> wrote: Pierre, Thanks for the updates. Can you summarize? Have the number of changes become few enough in general to be practical? Alia On Thu, Oct 31, 2013 at 11:49 AM, Pierre Francois <[email protected]<mailto:[email protected]>> wrote: Stephane, Much progress on the topic has been made since that much preliminary Infocom paper. So here come more up-to-date reference points to compare: Graceful Convergence in Link-State IP Networks F. Clad, P. Mérindol, J.-J. Pansiot, P. Francois and O. Bonaventure In IEEE/ACM Transactions on Networking, 2013 documents the most optimised algorithm known so far for the link shutdown case, with extensive simulation results and performance analysis. Graceful Router Updates for Link-State Protocols F. Clad, P. Mérindol, S. Vissicchio, J.-J. Pansiot and P. Francois In proceedings of IEEE ICNP 2013, Göttingen, Germany, October 2013 provides an algorithm to do the same in the node shutdown case, smarter than doing one link after the other. Cheers, Pierre. On Oct 23, 2013, at 2:01 PM, [email protected]<mailto:[email protected]> wrote: Hi, I would need more time to review your algo part. But anyway, could you explain the difference with some old public approach like the paper from Pierre, Mike and Olivier : http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.67.8263&rep=rep1&type=pdf Moreover I would be interested to see in your draft some simulation proving the metric list is quite low ... I can remember in the paper I'm referencing that the challenge was to compress the KMS list in order to prevent a very very long list which would not be applicable in a live network. Thanks Stephane -----Message d'origine----- De : [email protected]<mailto:[email protected]> [mailto:rtgwg-<mailto:rtgwg->[email protected]<mailto:[email protected]>] De la part de Yangang Envoyé : lundi 21 octobre 2013 03:49 À : [email protected]<mailto:[email protected]> Cc : Zhangxudong (zhangxudong, VRP); Yangang Objet : Soliciting WG feedback and comments on draft-zxd-rtgwg-ordered-metric-adjustment-00 Hi: We had submitted the a new draft: http://tools.ietf.org/html/draft-zxd-rtgwg-ordered-metric-adjustment-00, we want to discuss the micro-loop problem through another method. Your feedback and comments on the rtgwg mailing list are appreciated. Thanks, Rahul.Yan -----邮件原件----- 发件人: [email protected]<mailto:[email protected]> [mailto:[email protected]<mailto:[email protected]>] 发送时间: 2013年10月18日 15:47 收件人: Zhangxudong (zhangxudong, VRP); Yangang 主题: New Version Notification for draft-zxd-rtgwg-ordered-metric-adjustment-00.txt A new version of I-D, draft-zxd-rtgwg-ordered-metric-adjustment-00.txt has been successfully submitted by Xudong Zhang and posted to the IETF repository. Filename: draft-zxd-rtgwg-ordered-metric-adjustment Revision: 00 Title: Algorithm for Ordered Metric Adjustment Creation date: 2013-10-18 Group: Individual Submission Number of pages: 10 URL: http://www.ietf.org/internet-drafts/draft-zxd-rtgwg-ordered-metric-adjustment-00.txt Status: http://datatracker.ietf.org/doc/draft-zxd-rtgwg-ordered-metric-adjustment Htmlized: http://tools.ietf.org/html/draft-zxd-rtgwg-ordered-metric-adjustment-00 Abstract: Upon link down event or link up event, each device in network individually schedules route calculation. Because of different hardware capabilities and internal/external environments, the time to update forwarding entries on these devices are disordered which can cause a transient forwarding loop. This document introduces a method to prevent forwarding loop by adjusting link metric gradually for several times. Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org<http://tools.ietf.org/>. The IETF Secretariat _______________________________________________ rtgwg mailing list [email protected]<mailto:[email protected]> https://www.ietf.org/mailman/listinfo/rtgwg _________________________________________________________________________________________________________________________ Ce message et ses pieces jointes peuvent contenir des informations confidentielles ou privilegiees et ne doivent donc pas etre diffuses, exploites ou copies sans autorisation. 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