Re: BGP TE attr last call by softwires WG
JP Vasseur <jvasseur@cisco.com> Fri, 22 August 2008 15:57 UTC
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Date: Fri, 22 Aug 2008 17:42:18 +0200
Subject: Re: BGP TE attr last call by softwires WG
From: JP Vasseur <jvasseur@cisco.com>
To: Adrian Farrel <adrian@olddog.co.uk>, Don Fedyk <dwfedyk@nortel.com>, softwires@ietf.org
CC: dward@cisco.com, alain_durand@cable.comcast.com, ccamp@ops.ietf.org, Yakov Rekhter <yakov@juniper.net>, Hamid Ould-Brahim <hbrahim@nortel.com>
Message-ID: <C4D4AAFA.4FDFB%jvasseur@cisco.com>
Thread-Topic: BGP TE attr last call by softwires WG
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Hi all, I'd like to second Adrian's point here - see below. On 8/22/08 1:18 AM, "Adrian Farrel" <adrian@olddog.co.uk> wrote: > Hello Don, > > Thanks for the response. > >>> 1. A CE is attached by parallel links to a single PE >>> >>> Suppose the links have the same switching types, but >>> different bandwidths. Link-a has plenty of bandwidth >>> available with an MTU size of x. Link-b has not much >>> bandwidth available with an MTU size of y > x. >> >> Interface MTU is part of the PSC TE attributes in the our spec. If the >> MTUs are different they should not be aggregated. > > Right. > Aggregation in this case is hard to make representative of reality. That is also my concern ... It would be really nice to clarify that TE aggregation must be avoided. > >> Also In L1VPN (LSC and TDM) networks the Switching type >> covers Switching granularity (which is like an MTU). > > Sure. But I wanted to keep in PSC, because that problem represents a single > layer network. > >> I'm trying to understand if you are saying the following text would >> fix the problem or you see a larger issue: >> "Therefore, such routes and the corresponding TE information >> SHALL NOT be aggregated unless they share identical Traffic >> Engineering Attributes". > > The question I am asking is - is the solution to this problem to advertise > two routes? > (Clearly two is a special case of many.) > > I don't believe that in the general (non-TE case) we would consider the case > of two parallel links between CE and PE as route aggregation. The PE would > simply advertise reachability (through itself) to the CE. > > Hence my question below. > >>> Normally, we would expect the PE to advertise a single >>> piece of reachability information for the CE leaving >>> the actual choice of links to be made by the PE. >>> >>> What would the PE advertise in this case? >>> - It cannot aggregate the TE information because that >>> would imply that there was lots of bandwidth at the >>> larger MTU size. >>> - It could include duplicate Switching Capability >>> Descriptors, but that would need some clarification as >>> duplicate descriptors are intended for different >>> switching caps in the IGP RFCs. >>> - It could advertise two pieces of reachability >>> information, but that would be a change to how the >>> implementation currently works. > >>> 2. There is more than one AS > [SNIP] >> I remember we discussed this aspect originally in the context of >> L1VPNs and limited it to a single AS since L1VPNs Basic Mode >> are limited to a single AS. I don't recall if we thought this was >> applicable to a multi-AS solution. >> >> We should clarify this point either way. > > Thanks. > I guess: > - if applicable, how? > - if not applicable, how prevent? > Same question. Thanks Don. JP. > Cheers, > Adrian > >
- BGP TE attr last call by softwires WG Adrian Farrel
- Re: BGP TE attr last call by softwires WG Adrian Farrel
- RE: BGP TE attr last call by softwires WG Don Fedyk
- Re: BGP TE attr last call by softwires WG Adrian Farrel
- Re: BGP TE attr last call by softwires WG JP Vasseur
- Re: BGP TE attr last call by softwires WG Yakov Rekhter
- Re: BGP TE attr last call by softwires WG Yakov Rekhter
- Re: BGP TE attr last call by softwires WG Adrian Farrel
- Re: BGP TE attr last call by softwires WG (2nd qu… Adrian Farrel
- Re: [Softwires] BGP TE attr last call by softwire… Lou Berger
- Re: [Softwires] BGP TE attr last call by softwire… Yakov Rekhter
- Re: [Softwires] BGP TE attr last call by softwire… Lou Berger
- Re: [Softwires] BGP TE attr last call by softwire… Yakov Rekhter
- Re: BGP TE attr last call by softwires WG Yakov Rekhter
- Re: [Softwires] BGP TE attr last call by softwire… Lou Berger
- Re: [Softwires] BGP TE attr last call by softwire… Yakov Rekhter
- Re: [Softwires] BGP TE attr last call by softwire… Lou Berger
- Re: [Softwires] BGP TE attr last call by softwire… Yakov Rekhter
- Re: [Softwires] BGP TE attr last call by softwire… Lou Berger
- Re: [Softwires] BGP TE attr last call by softwire… Yakov Rekhter
- Re: [Softwires] BGP TE attr last call by softwire… Lou Berger
- Re: [Softwires] BGP TE attr last call by softwire… Yakov Rekhter
- Re: [Softwires] BGP TE attr last call by softwire… Lou Berger