Re: [mpls] MPLS_RT review of draft-mirsky-mpls-residence-time-06.txt
Gregory Mirsky <gregory.mirsky@ericsson.com> Thu, 02 July 2015 17:59 UTC
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From: Gregory Mirsky <gregory.mirsky@ericsson.com>
To: "Osborne, Eric" <eric.osborne@level3.com>, "Yaakov Stein (yaakov_s@rad.com)" <yaakov_s@rad.com>, Lucy yong <lucy.yong@huawei.com>, "draft-mirsky-mpls-residence-time@tools.ietf.org" <draft-mirsky-mpls-residence-time@tools.ietf.org>, "mpls-chairs@tools.ietf.org" <mpls-chairs@tools.ietf.org>, Markus Jork <mjork@juniper.net>
Thread-Topic: MPLS_RT review of draft-mirsky-mpls-residence-time-06.txt
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Date: Thu, 02 Jul 2015 17:59:38 +0000
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Subject: Re: [mpls] MPLS_RT review of draft-mirsky-mpls-residence-time-06.txt
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Hi Eric, many thanks for your help and kind consideration. We'll upload the draft shortly and will wait for the call from Loa on the next step. Regards, Greg -----Original Message----- From: Osborne, Eric [mailto:eric.osborne@level3.com] Sent: Thursday, July 02, 2015 6:59 AM To: Gregory Mirsky; Yaakov Stein (yaakov_s@rad.com); Lucy yong; draft-mirsky-mpls-residence-time@tools.ietf.org; mpls-chairs@tools.ietf.org; Markus Jork Cc: mpls@ietf.org Subject: RE: MPLS_RT review of draft-mirsky-mpls-residence-time-06.txt Hi Greg- Sorry for the late reply, I've been buried in stuff. I took a quick scan of the diffs and they look good to me. eric > -----Original Message----- > From: Gregory Mirsky [mailto:gregory.mirsky@ericsson.com] > Sent: Thursday, June 25, 2015 5:02 PM > To: Gregory Mirsky; Osborne, Eric; Yaakov Stein (yaakov_s@rad.com); > Lucy yong; draft-mirsky-mpls-residence-time@tools.ietf.org; mpls- > chairs@tools.ietf.org; Markus Jork > Cc: mpls@ietf.org > Subject: RE: MPLS_RT review of draft-mirsky-mpls-residence-time-06.txt > > Dear Reviewers, > would greatly appreciate your comments on proposed changes. Please let > us know whether your comments, suggestions been addressed in -07 > version of the draft. > > Regards, > Greg > > -----Original Message----- > From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Gregory Mirsky > Sent: Thursday, June 18, 2015 12:27 PM > To: Osborne, Eric; Yaakov Stein (yaakov_s@rad.com); Lucy yong; draft- > mirsky-mpls-residence-time@tools.ietf.org; mpls-chairs@tools.ietf.org; > Markus Jork > Cc: mpls@ietf.org > Subject: Re: [mpls] MPLS_RT review of > draft-mirsky-mpls-residence-time- 06.txt > > Hi Lucy, Markus, Eric, and Yaakov, > many thanks for your kind consideration and thoughtful comments. > Attached are new version of the draft and diff that highlights changes proposed. > Greatly appreciate your review and hope that you find your comments > being addressed, mostly if not completely. > > Regards, > Greg > > > -----Original Message----- > From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Osborne, Eric > Sent: Tuesday, May 26, 2015 6:45 AM > To: Lucy yong; draft-mirsky-mpls-residence-time@tools.ietf.org; mpls- > chairs@tools.ietf.org > Cc: mpls@ietf.org > Subject: Re: [mpls] MPLS_RT review of > draft-mirsky-mpls-residence-time- 06.txt > > I finally had some time to read this draft as well. I agree with > Lucy's general comments - this doc seems to achieve the goal it sets > out. Is it useful? Not to me. It seems like it's maybe for mobile > networks? I'm not an expert in the matter of timing so this review > assumes that the actual timing procedures work. My comments below are about how RTM fits into the larger picture. > > > General question: does RTM work over LAGs? They're a flavor of ECMP > in some respects. If not, that needs to be spelled out somewhere. > > It might be worth spending a few lines in the introduction talking > about who might want to use this and what sort of restrictions it > places on a network design. > > > > Specific comments: > > Section 4 talks about LDP and ECMP and the problems it causes. It > suggests that one solution is to disable ECMP used for RTM LSPs. This > seems like it would only make the problem worse; the more you separate > the OAM path from the actual data path, the less useful your > measurements are. You may be far better off just saying "don't do RTM with MP2P LSPs". > > Section 4.1, "LSAs sent from an interface". This doesn't line up with > how link- state protocols work. There should be no property of an LSA > dependant upon the interface that it's sent out (OK, modulo type 9 > opaques and stuff). I think this really wants to say "LSAs sent from > a router which describe a particular interface". > > > Section 4.5 could use a review from an ISIS expert. I scanned the > GENINFO TLV and it's not clear to me how RTM will associate a > capability with a specific interface between peers. What if I have > several interfaces between A-B and only some of them support RTM? I'm > not saying this isn't covered, but that it's not clear to me as a casual reader of Section 4.5 and GENINFO. > > Section 4.6, "egress LSR's egress interface". So if I have > > > A---B---C---D---E---F > > a TE LSP B->E and IP nodes A and F, is section 4.6 really referring to > the E->F interface? > > > What if I have a TE LSP A->F? Where's the 'egress LSR's egress interface'? > What if I have a TE LSP A->C, C->E and E->F? Or LDP A->C, TE C->E, LDP E->F? > > > > > eric > > > > > -----Original Message----- > > From: mpls [mailto:mpls-bounces@ietf.org] On Behalf Of Lucy yong > > Sent: Wednesday, May 06, 2015 6:39 PM > > To: draft-mirsky-mpls-residence-time@tools.ietf.org; mpls- > > chairs@tools.ietf.org > > Cc: mpls@ietf.org > > Subject: Re: [mpls] MPLS_RT review of > > draft-mirsky-mpls-residence-time- 06.txt > > > > Hi All, > > > > I reviewed draft-mirsky-mpls-residence-time as the member of MPLS > > Review Team and have the following comments: > > > > is the document coherent? > > > > Yes. It specifies how MPLS supports residence time measurement. > > > > is it useful (ie, is it likely to be actually useful in operational networks)? > > > > The document claims that such measurement can improve the accuracy > > of clock synchronization across the network. I am not an operator > > and author and not sure how useful this feature provides compared to > > the complexity adding to. > > > > is the document technically sound? > > Yes. The draft provides a detail solution in control plane and data > > plane to achieve this purpose. > > > > is the document ready to be considered for WG adoption? > > Yes. The document states the problem clearly and provides a solution > > to address this problem. > > > > IMHO: after adopting it as the WG draft, the WG should further > > evaluate if control plane and data plane solution can be simplified. > > The areas may be > > considered: > > 1) Do we have to use IGP to announce node RTM capability? Can > > RSVP-TE resolve the issue by itself? > > 2) Will possible to enhance RRO to serve RSO purpose instead of > > carrying both RRO and RSO in the message? > > 3) Since this feature is designed for the LSP that is used for clock > > synchronization, such LSPs are not majority, so it should be option > > in LSP setup. Make that very clear. > > 4) two-step clock mode is quite complex. The description in Section > > 7 is not clear to me why this mode is necessary. > > > > Regards, > > Lucy > > > > _______________________________________________ > > mpls mailing list > > mpls@ietf.org > > https://www.ietf.org/mailman/listinfo/mpls > > _______________________________________________ > mpls mailing list > mpls@ietf.org > https://www.ietf.org/mailman/listinfo/mpls
- Re: [mpls] MPLS_RT review of draft-mirsky-mpls-re… Lucy yong
- Re: [mpls] MPLS_RT review of draft-mirsky-mpls-re… Alexander Vainshtein
- Re: [mpls] MPLS_RT review of draft-mirsky-mpls-re… Markus Jork
- Re: [mpls] MPLS_RT review of draft-mirsky-mpls-re… Osborne, Eric
- Re: [mpls] MPLS_RT review of draft-mirsky-mpls-re… Yaakov Stein
- Re: [mpls] MPLS_RT review of draft-mirsky-mpls-re… Osborne, Eric
- Re: [mpls] MPLS_RT review of draft-mirsky-mpls-re… Alexander Vainshtein
- Re: [mpls] MPLS_RT review of draft-mirsky-mpls-re… Gregory Mirsky
- Re: [mpls] MPLS_RT review of draft-mirsky-mpls-re… Gregory Mirsky
- Re: [mpls] MPLS_RT review of draft-mirsky-mpls-re… Gregory Mirsky
- Re: [mpls] MPLS_RT review of draft-mirsky-mpls-re… Osborne, Eric
- Re: [mpls] MPLS_RT review of draft-mirsky-mpls-re… Gregory Mirsky
- Re: [mpls] MPLS_RT review of draft-mirsky-mpls-re… Gregory Mirsky
- Re: [mpls] MPLS_RT review of draft-mirsky-mpls-re… Osborne, Eric
- Re: [mpls] MPLS_RT review of draft-mirsky-mpls-re… Gregory Mirsky