Re: [mpls] progressing draft-mtaillon-mpls-summary-frr-rsvpte
Lou Berger <lberger@labn.net> Tue, 13 October 2015 19:18 UTC
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To: "Tarek Saad (tsaad)" <tsaad@cisco.com>, "mpls@ietf.org" <mpls@ietf.org>, "draft-mtaillon-mpls-summary-frr-rsvpte@ietf.org" <draft-mtaillon-mpls-summary-frr-rsvpte@ietf.org>
References: <55FA9994.5000304@pi.nu> <55FADA66.4080709@labn.net> <D224DFD2.40F4E%tsaad@cisco.com> <56053C00.1000101@labn.net> <D242C75C.46F89%tsaad@cisco.com>
From: Lou Berger <lberger@labn.net>
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Date: Tue, 13 Oct 2015 15:18:41 -0400
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Subject: Re: [mpls] progressing draft-mtaillon-mpls-summary-frr-rsvpte
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Tarek, Thanks for the status. I'll keep an eye out for the next rev. Lou On 10/13/2015 2:46 PM, Tarek Saad (tsaad) wrote: > Hi Lou, > > The authors met and reviewed the proposal to use the RSVP Association > object as a mechanism to relay the per-group bypass assignment information > between the PLR(s) and MP(s). We agree that since the Association object > as proposed is used to associate recovery LSP with the LSPs it is > protecting can serve the purpose of associating a group of protected > LSP(s) with a bypass LSP. We are looking into extending the IPv4/IPv6 > Extended ASSOCIATION Object (as defined in rfc6780) to carry the necessary > Summary FRR information between the PLR and MP. We plan to add this in the > next revision of the document. > > Regards, > Tarek > > > > On 2015-09-25, 8:20 AM, "Lou Berger" <lberger@labn.net> wrote: > >> Tarek, >> Thanks for the response, see below. >> >> On 9/20/2015 10:39 PM, Tarek Saad (tsaad) wrote: >>> Thanks Lou for your review and comments. Inline for responses. >>> >>> On 2015-09-17, 11:21 AM, "mpls on behalf of Lou Berger" >>> <mpls-bounces@ietf.org on behalf of lberger@labn.net> wrote: >>> >>>> I have some comments on the proposed mechanism (I have no opinion on >>>> utility or likely implementation): >>>> >>>> 1. WRT SUMMARY_FRR_BYPASS_ACTIVE object >>>> >>>> RSVP object space is a pretty scarce resource and it seems we have a >>>> number of existing objects that could be reused to support transport of >>>> the required information. Some candidates include: the Association >>>> object with a new association type; or perhaps the PRIMARY_PATH_ROUTE >>>> Object with a new C-type. >>> [TS]: seems reasonable, we will discuss this among the authors for a >>> suitable extension. >> great. >> >>>> 2. SUMMARY_FRR_BYPASS_ASSIGNMENT subobjects >>>> >>>> While RFC4090 makes use of RRO carried information, it does so without >>>> changing the RRO format. (At the time, I recall some used this as >>>> justification for RRO usage vs introducing new formats.) The new SOs >>>> introduce new information and don't seem to be particularly linked to >>>> normal RRO operation -- and more significantly really defining new >>>> transit-node to transit-node signaling semantics: >>> [TS]: the new SO, is recording local information that if intercepted by >>> another LSR (PLR or MP that understands it) can use it for further >>> summary >>> FRR processing. This resembles to an extent what other RRO SOs do today >>> (e.g. node-id and label Sos) for regular FRR. >> The point was that those SOs serve their original purpose of being >> useful in constructing EROs, while the new SOs really have entirely >> different semantics -- for example what does it mean if an ingress >> includes the new SOs for a transit node? >> >>>> The PLR notifies the MP of the bypass tunnel assignment via adding a >>>> SUMMARY_FRR_BYPASS_ASSIGNMENT subobject to the RSVP Path message >>>> RECORD_ROUTE object ... >>>> >>>> The MP acknowledges the PLR's assignment by signalling a >>>> SUMMARY_FRR_BYPASS_ASSIGNMENT subobject within the RSVP Resv messsage >>>> RECORD_ROUTE object. >>>> >>>> IMO this usage of RRO is really wrong (and is easily broken by >>>> application of RRO policies). I think extending an existing object >>> [TS]: yes, the comment (about RRO policies) is rightfully correct. .. >>> but >>> also applicable to existing RRO/SO(s) (e.g. node-id and/or label SO) >>> needed for proper FRR too. >> Again, this was leveraging SOs that were defined & used for other >> purposes and overloading their semantics. >> >>> That said, will discuss extension of an >>> existing (FRR) object amongst the authors for (dis)advantages. >> That would be great and will be very interested in hearing your thoughts. >> >> Thanks, >> Lou >> >>> Regards, >>> Tarek >>> >>> >>>> class is a better approach. Extending one of the existing FRR objects >>>> would probably be cleanest, but think the authors should consider and >>>> propose their preference. >>>> >>>> Lou >>>> >>>> On 9/17/2015 6:44 AM, Loa Andersson wrote: >>>>> Working Groups, >>>>> >>>>> The mpls and teas working group chairs discussed the home working >>>>> group for draft-mtaillon-mpls-summary-frr-rsvpte. Since the is >>>>> entirely >>>>> the choice fell on the mpls working group. We also decided to keep >>>>> the teas wg in the loop. >>>>> >>>>> We have just initiated the mpls review team (MPLS-RT) review if this >>>>> draft. This review is focused on if we want to accept the document as >>>>> a working group draft, and if it is in shape for us to do so. >>>>> >>>>> The MPLS-RT reviewers are picked by the mpls chair that will shepherd >>>>> the document. >>>>> >>>>> This also mean that this is a good time for anyone, from both working >>>>> groups, to review the document. Please send your reviews to the mpls >>>>> working group mailing list (mpls@ietf.org). >>>>> >>>>> /Loa >>>>> >>>> _______________________________________________ >>>> mpls mailing list >>>> mpls@ietf.org >>>> https://www.ietf.org/mailman/listinfo/mpls >> >
- [mpls] progressing draft-mtaillon-mpls-summary-fr… Loa Andersson
- Re: [mpls] progressing draft-mtaillon-mpls-summar… Lou Berger
- Re: [mpls] progressing draft-mtaillon-mpls-summar… Tarek Saad (tsaad)
- Re: [mpls] progressing draft-mtaillon-mpls-summar… Lou Berger
- Re: [mpls] progressing draft-mtaillon-mpls-summar… Tarek Saad (tsaad)
- Re: [mpls] progressing draft-mtaillon-mpls-summar… Lou Berger
- Re: [mpls] progressing draft-mtaillon-mpls-summar… Tarek Saad (tsaad)