Re: [PWE3] Fwd: I-D Action: draft-shawam-pwe3-ms-pw-protection-01.txt
Alexander Vainshtein <Alexander.Vainshtein@ecitele.com> Sun, 28 September 2014 05:03 UTC
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From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
To: "Andrew G. Malis" <agmalis@gmail.com>
Thread-Topic: [PWE3] Fwd: I-D Action: draft-shawam-pwe3-ms-pw-protection-01.txt
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Date: Sun, 28 Sep 2014 05:03:21 +0000
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Subject: Re: [PWE3] Fwd: I-D Action: draft-shawam-pwe3-ms-pw-protection-01.txt
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Andy, I've read the draft and re-read RFC 6780, and I have a couple of questions/comments that, from my point of view, should be clarified in the next revision of the draft. 1. RFC 6780 and RFC 6718 describe multiple use cases for PW redundancy, including use cases with dual-homed CEs, use cases for VPLS etc. The draft refers to specific sections in these RFCs that deal with the use case of two single-homed CEs, so I guess that this is the intended scope of the draft. Is this assumption correct? If yes, I would suggest stating this explicitly and even including the corresponding reference network model diagram in the draft. This would not unduly expand the document while making it much more readable IMO. (And maybe you should mention draft-cheng-pwe3-mpls-tp-dual-homing-protection a dealing with the dual-homing use cases?) 2. RFC 6870 does not explain how S-PE failure is detected. I assume that one of the possible ways to do that could be by treating failure of the targeted/indirect LDP session between this S-PE and its adjacent PEs as S-PE failure. This is clearly not relevant in the case of statically set up MS-PWs. I would suggest adding a few words regarding possible methods for detecting S-PE failure. (As an absolute minimum, you could state that this is out of scope of the document...) 3. To the best of my recollection somebody has once posted a draft that suggested treating static MS-PWs as MPLS-TP co-routed bi-directional LSPs (which is true)and applying LSP Linear Protection for end-to-end protection of MS-PWs. This draft has long expired, but maybe the idea should be mentioned as a possible alternative approach? With these points in mind, I think that the draft is mature enough to be adopted as a WG document (even if you did not ask for that:-). Regards, Sasha ________________________________ From: pwe3 <pwe3-bounces@ietf.org> on behalf of Andrew G. Malis <agmalis@gmail.com> Sent: Saturday, September 27, 2014 6:02 PM To: pwe3@ietf.org Subject: [PWE3] Fwd: I-D Action: draft-shawam-pwe3-ms-pw-protection-01.txt PWE3ers, Revision -00 of this draft was presented at the Toronto IETF and we received good feedback from the WG. We've updated the draft to incorporate the received comments. The draft plugs an important hole in resilience for static MS-PWs. Please review and comment to the list, it's a very quick read. Thanks, Andy ---------- Forwarded message ---------- From: <internet-drafts@ietf.org<mailto:internet-drafts@ietf.org>> Date: Fri, Sep 26, 2014 at 6:05 PM Subject: I-D Action: draft-shawam-pwe3-ms-pw-protection-01.txt To: i-d-announce@ietf.org<mailto:i-d-announce@ietf.org> A New Internet-Draft is available from the on-line Internet-Drafts directories. Title : S-PE Outage Protection for Static Multi-Segment Pseudowires Authors : Andrew G. Malis Loa Andersson Huub van Helvoort Jongyoon Shin Lei Wang Alessandro D'Alessandro Filename : draft-shawam-pwe3-ms-pw-protection-01.txt Pages : 5 Date : 2014-09-26 Abstract: In MPLS and MPLS-TP environments, statically provisioned Single- Segment Pseudowires (SS-PWs) are protected against tunnel failure via MPLS-level and MPLS-TP-level tunnel protection. With statically provisioned Multi-Segment Pseudowires (MS-PWs), each segment of the MS-PW is likewise protected from tunnel failures via MPLS-level and MPLS-TP-level tunnel protection. However, static MS-PWs are not protected end-to-end against failure of one of the switching PEs (S-PEs) along the path of the MS-PW. This document describes how to achieve this protection by updating the existing procedures in RFC 6870. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-shawam-pwe3-ms-pw-protection/ There's also a htmlized version available at: http://tools.ietf.org/html/draft-shawam-pwe3-ms-pw-protection-01 A diff from the previous version is available at: http://www.ietf.org/rfcdiff?url2=draft-shawam-pwe3-ms-pw-protection-01 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>. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ _______________________________________________ I-D-Announce mailing list I-D-Announce@ietf.org<mailto:I-D-Announce@ietf.org> https://www.ietf.org/mailman/listinfo/i-d-announce Internet-Draft<https://www.ietf.org/mailman/listinfo/i-d-announce Internet-Draft> directories: http://www.ietf.org/shadow.html or ftp://ftp.ietf.org/ietf/1shadow-sites.txt
- [PWE3] Fwd: I-D Action: draft-shawam-pwe3-ms-pw-p… Andrew G. Malis
- Re: [PWE3] Fwd: I-D Action: draft-shawam-pwe3-ms-… Alexander Vainshtein
- Re: [PWE3] Fwd: I-D Action: draft-shawam-pwe3-ms-… Andrew G. Malis
- Re: [PWE3] Fwd: I-D Action: draft-shawam-pwe3-ms-… Alexander Vainshtein
- Re: [PWE3] Fwd: I-D Action: draft-shawam-pwe3-ms-… Andrew G. Malis
- Re: [PWE3] Fwd: I-D Action: draft-shawam-pwe3-ms-… Huub van Helvoort
- Re: [PWE3] Fwd: I-D Action: draft-shawam-pwe3-ms-… Alexander Vainshtein
- Re: [PWE3] Fwd: I-D Action: draft-shawam-pwe3-ms-… Andrew G. Malis
- Re: [PWE3] Fwd: I-D Action: draft-shawam-pwe3-ms-… Alexander Vainshtein
- Re: [PWE3] Fwd: I-D Action: draft-shawam-pwe3-ms-… Andrew G. Malis