Re: [mpls] New Version Notification for draft-mirsky-spring-bfd-00.txt
Robert Raszuk <robert@raszuk.net> Wed, 10 May 2017 19:40 UTC
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From: Robert Raszuk <robert@raszuk.net>
Date: Wed, 10 May 2017 21:40:00 +0200
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Subject: Re: [mpls] New Version Notification for draft-mirsky-spring-bfd-00.txt
To: "Carlos Pignataro (cpignata)" <cpignata@cisco.com>
Cc: Greg Mirsky <gregimirsky@gmail.com>, "mpls@ietf.org" <mpls@ietf.org>, "spring@ietf.org" <spring@ietf.org>, "rtg-bfd@ietf.org" <rtg-bfd@ietf.org>
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Hi Carlos, Sorry what is "TFS" ? RFC 7110 does not even use such abbreviation neither do draft-ietf-mpls-bfd-directed :) Google also seems to be pretty clueless about it. Just curious as you keep using this term in each email :) Thx, R. On Wed, May 10, 2017 at 9:24 PM, Carlos Pignataro (cpignata) < cpignata@cisco.com> wrote: > Greg, > > In the MPLS data plane, FECs are also instantiated through a label stack. > But RFC 7110 does not use numeric label values, it uses TFSs. That does not > create any additional state. E.g.,: https://www.ietf.org/ > mail-archive/web/mpls/current/msg16091.html > > Thanks, > > — Carlos. > > > > On May 9, 2017, at 3:43 PM, Greg Mirsky <gregimirsky@gmail.com> wrote: > > Hi Carlos, > I probably would characterize anything that starts with Why not as a > technical comment but rather as a question. > According to draft-ietf-spring-segment-routing-mpls, "In the MPLS > dataplane,the SR header is instantiated through a label stack". > At the same time, one of advantages of SR is that "per-flow state only > [maintained] at the ingress node to the SR domain". > Thus, for the case of monitoring unidirectional SR tunnels, I consider > that there's no need to create any additional state on the egress node. > Of course, if there were bidirectional SR tunnels, then control of the > reverse direction of the BFD session would not require use of the Return > Path sub-TLV. > As for LSP-Ping, I just propose that the Segment Routing MPLS Tunnel > sub-TLV MAY be used Reply Path TLV defined in RFC 7110. I viewed the > proposal as invitation to technical discussion. > > Regards, > Greg > > On Tue, May 9, 2017 at 9:07 AM, Carlos Pignataro (cpignata) < > cpignata@cisco.com> wrote: > >> Thank you Greg! >> >> Since https://tools.ietf.org/html/draft-mirsky-spring-bfd-00 seems quite >> similar to the text removed at https://tools.ietf.org/rfcdiff >> ?url2=draft-ietf-mpls-bfd-directed-05.txt, then the complete set of >> outstanding technical comments that triggered the removal of that text from >> draft-ietf-mpls-bfd-directed-05.txt might peek your interest :-) >> >> One that I recall is: why use label values when every other return-path >> sub-TLV for BFD and for LSP-Ping, including draft-ietf-mpls-bfd-directed, >> uses TFSs? >> >> Best, >> >> — Carlos. >> >> On May 9, 2017, at 12:00 PM, Greg Mirsky <gregimirsky@gmail.com> wrote: >> >> Dear Carlos, >> I've decided to re-start the discussion and am interested to hear >> technical comments to the proposed solution. >> >> Regards, >> Greg >> >> On Tue, May 9, 2017 at 8:51 AM, Carlos Pignataro (cpignata) < >> cpignata@cisco.com> wrote: >> >>> Dear Greg, >>> >>> Cursorily scanning through this, it seems that most concerns raised and >>> comments made about the SR sections of draft-ietf-mpls-bfd-directed-0N >>> (with N < 5) apply to your new draft. >>> >>> This is one of those: https://www.ietf.org/ma >>> il-archive/web/mpls/current/msg15860.html — the list archive shows a >>> few more. The copy/paste did not address the comments. >>> >>> Best, >>> >>> — Carlos. >>> >>> On May 8, 2017, at 11:33 PM, Greg Mirsky <gregimirsky@gmail.com> wrote: >>> >>> Dear All, >>> perhaps this new draft may is of interest to you. >>> Your comments, suggestions are most welcome and greatly appreciated. >>> >>> Regards, >>> Greg >>> >>> ---------- Forwarded message ---------- >>> From: <internet-drafts@ietf.org> >>> Date: Mon, May 8, 2017 at 8:29 PM >>> Subject: New Version Notification for draft-mirsky-spring-bfd-00.txt >>> To: Gregory Mirsky <gregimirsky@gmail.com> >>> >>> >>> >>> A new version of I-D, draft-mirsky-spring-bfd-00.txt >>> has been successfully submitted by Greg Mirsky and posted to the >>> IETF repository. >>> >>> Name: draft-mirsky-spring-bfd >>> Revision: 00 >>> Title: Bidirectional Forwarding Detection (BFD) in Segment >>> Routing Networks Using MPLS Dataplane >>> Document date: 2017-05-08 >>> Group: Individual Submission >>> Pages: 7 >>> URL: https://www.ietf.org/internet- >>> drafts/draft-mirsky-spring-bfd-00.txt >>> Status: https://datatracker.ietf.org/ >>> doc/draft-mirsky-spring-bfd/ >>> Htmlized: https://tools.ietf.org/html/draft-mirsky-spring-bfd-00 >>> Htmlized: https://datatracker.ietf.org/ >>> doc/html/draft-mirsky-spring-bfd-00 >>> >>> >>> Abstract: >>> Segment Routing architecture leverages the paradigm of source >>> routing. It can be realized in the Multiprotocol Label Switching >>> (MPLS) network without any change to the data plane. A segment is >>> encoded as an MPLS label and an ordered list of segments is encoded >>> as a stack of labels. Bidirectional Forwarding Detection (BFD) is >>> expected to monitor any kind of paths between systems. This document >>> defines how to use Label Switched Path Ping to bootstrap and control >>> path in reverse direction of a BFD session on the Segment Routing >>> network over MPLS dataplane. >>> >>> >>> >>> >>> 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. >>> >>> The IETF Secretariat >>> >>> >>> _______________________________________________ >>> mpls mailing list >>> mpls@ietf.org >>> https://www.ietf.org/mailman/listinfo/mpls >>> >>> >>> >> >> > >
- Fwd: New Version Notification for draft-mirsky-sp… Greg Mirsky
- Re: [mpls] New Version Notification for draft-mir… Carlos Pignataro (cpignata)
- Re: [mpls] New Version Notification for draft-mir… Greg Mirsky
- Re: [mpls] New Version Notification for draft-mir… Carlos Pignataro (cpignata)
- Re: [mpls] New Version Notification for draft-mir… Greg Mirsky
- Re: [mpls] New Version Notification for draft-mir… Carlos Pignataro (cpignata)
- Re: [mpls] New Version Notification for draft-mir… Robert Raszuk
- Re: [mpls] New Version Notification for draft-mir… Robert Raszuk
- Re: [mpls] New Version Notification for draft-mir… Carlos Pignataro (cpignata)
- Re: [mpls] New Version Notification for draft-mir… Greg Mirsky
- Re: [mpls] New Version Notification for draft-mir… Carlos Pignataro (cpignata)