Re: [Idr] Capability Advertisement in draft-ietf-idr-bgp-extended-messages

Robert Raszuk <robert@raszuk.net> Thu, 01 August 2019 15:53 UTC

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References: <CAMMESsyvuU8_dBOeoOXPBt=-HwoF0eHvYgm5d8CgF-4o_oiP=g@mail.gmail.com> <20190731211602.GA31271@pfrc.org> <119404A5-8384-456B-9677-0445899B008F@cisco.com> <20190801002911.GB31271@pfrc.org> <BYAPR11MB3751B2E90D5CBD559EBE319CC0DE0@BYAPR11MB3751.namprd11.prod.outlook.com> <m2ef25tnn3.wl-randy@psg.com> <m2blx9t28j.wl-randy@psg.com>
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From: Robert Raszuk <robert@raszuk.net>
Date: Thu, 1 Aug 2019 11:52:54 -0400
Message-ID: <CAOj+MMFXbpg37bWHdvRpX25KOq7NsJcw-=uhfi=YiRXoCFgnrg@mail.gmail.com>
To: Randy Bush <randy@psg.com>
Cc: "Jakob Heitz (jheitz)" <jheitz@cisco.com>, "idr@ietf. org" <idr@ietf.org>, "idr-chairs@ietf.org" <idr-chairs@ietf.org>, "draft-ietf-idr-bgp-extended-messages@ietf.org" <draft-ietf-idr-bgp-extended-messages@ietf.org>, Susan Hares <shares@ndzh.com>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/idr/dTJFW9M7RWJvsbdc2Zr3fVy4of8>
Subject: Re: [Idr] Capability Advertisement in draft-ietf-idr-bgp-extended-messages
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I know I am late with this suggestion - but why not do this in backwards
compatible fashion moving the solution up the stack ?

Instead of extending the message itself - why not to issue a simple draft
to enable sending BGP UPDATE exceeding 4K into multiple UPDATE messages ?



On Thu, Aug 1, 2019 at 10:00 AM Randy Bush <randy@psg.com>; wrote:

> >> A BGP speaker MUST NOT send the extended messages capability in an
> >> OPEN message to any BGP speaker if it has received an OPEN message
> >> without the extended message capability from any BGP speaker.
> >
> > so, until every router in the bgp internet is extended enabled, no
> > router may use extended.
>
> even more fun
>
> the internet is only four routers, A - B - C - D
> they are all happily speaking extended
> router E joins after D
> E does not speak extended
>
> how does the signal to not speak extended propagate
> E - D - C - B - A?
>
> randy
>
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