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Re: [Dcrouting] [Lsvr] A comment on draft-keyupate-idr-bgp-spf

"Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net> Fri, 05 January 2018 20:09 UTC

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From: "Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net>
To: "Acee Lindem (acee)" <acee@cisco.com>, "Joel M. Halpern" <jmh@joelhalpern.com>, EXT - randy <randy@psg.com>, Keyur Patel <keyur@arrcus.com>
CC: Xuxiaohu <xuxiaohu@huawei.com>, "dcrouting@ietf.org" <dcrouting@ietf.org>, "lsvr@ietf.org" <lsvr@ietf.org>, Alvaro Retana <aretana.ietf@gmail.com>
Thread-Topic: [Dcrouting] [Lsvr] A comment on draft-keyupate-idr-bgp-spf
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Date: Fri, 05 Jan 2018 20:09:20 +0000
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References: <0DB89F21-8E32-46A7-A2B7-B79977948455@arrcus.com> <m2373nocer.wl-randy@psg.com> <D6723964.E82B2%acee@cisco.com> <dd81cd67-4aa8-c322-d447-532943abbe89@joelhalpern.com> <D6752221.E886A%acee@cisco.com>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/dcrouting/XZiXz8H5Rtv7guXldfbTfnBQNnU>
Subject: Re: [Dcrouting] [Lsvr] A comment on draft-keyupate-idr-bgp-spf
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Today there are well defined (perhaps vendor-specific) procedures to choose if an OSPF route or a BGP route is used for a particular prefix. I assume if we treat BGP-SPF as a another protocol, then the problems is solved already?

Jeffrey

> -----Original Message-----
> From: Acee Lindem (acee) [mailto:acee@cisco.com]
> Sent: Friday, January 5, 2018 12:39 PM
> To: Joel M. Halpern <jmh@joelhalpern.com>; EXT - randy <randy@psg.com>;
> Keyur Patel <keyur@arrcus.com>
> Cc: Xuxiaohu <xuxiaohu@huawei.com>; dcrouting@ietf.org; lsvr@ietf.org;
> Alvaro Retana <aretana.ietf@gmail.com>
> Subject: Re: [Dcrouting] [Lsvr] A comment on draft-keyupate-idr-bgp-spf
> 
> Hi Joel,
> 
> 
> 
> Yes - this is one of the areas of complexity when implementing BGP SPF. It
> 
> is the reason why we allocate a separate SAFI from normal BGP-LS state
> 
> distribution.
> 
> 
> 
> Thanks,
> 
> Acee
> 
> 
> 
> On 1/3/18, 10:07 AM, "Dcrouting on behalf of Joel M. Halpern"
> 
> <dcrouting-bounces@ietf.org on behalf of jmh@joelhalpern.com> wrote:
> 
> 
> 
> >It seems to me that having two different BGP decision processes
> 
> >available is going to have significant impact on achieving consistency
> 
> >so taht routing actually converges. I suspect it willnot take much to
> 
> >define what choices are stable and effective.
> 
> >
> 
> >Leaving out any comments on how to make this (coexistence) work seems a
> 
> >mistake.
> 
> >
> 
> >Yours,
> 
> >Joel
> 
> >
> 
> >On 1/3/18 7:40 AM, Acee Lindem (acee) wrote:
> 
> >> Agreed. Thanks Randy!
> 
> >>
> 
> >> Plan to refresh the draft this week.
> 
> >>
> 
> >> Acee
> 
> >>
> 
> >> On 1/2/18, 10:21 PM, "Randy Bush" <randy@psg.com> wrote:
> 
> >>
> 
> >>>> Furthermore, we could chose to consider such an interaction as a
> 
> >>>> matter of local policy (implementation specific).
> 
> >>>
> 
> >>> pedantry: s/implementation/configuration/.  i.e. op chooses, not
> 
> >>>vendor.
> 
> >>>
> 
> >>> randy
> 
> >>
> 
> >> _______________________________________________
> 
> >> Dcrouting mailing list
> 
> >> Dcrouting@ietf.org
> 
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