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Re: [Idr] Comments about draft-dong-idr-node-target-ext-comm

Robert Raszuk <robert@raszuk.net> Thu, 28 July 2022 20:18 UTC

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From: Robert Raszuk <robert@raszuk.net>
Date: Thu, 28 Jul 2022 22:17:44 +0200
Message-ID: <CAOj+MMELhopmN-dwBEMJHaGk4wKpXVSkGCYRCUEQtNiuLxMnSA@mail.gmail.com>
To: "Jeffrey (Zhaohui) Zhang" <zzhang=40juniper.net@dmarc.ietf.org>
Cc: "Dongjie (Jimmy)" <jie.dong@huawei.com>, Zhuangshunwan <zhuangshunwan@huawei.com>, "gunter.van_de_velde@nokia.com" <gunter.van_de_velde@nokia.com>, "idr@ietf. org" <idr@ietf.org>
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Subject: Re: [Idr] Comments about draft-dong-idr-node-target-ext-comm
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Hi Jeffrey,

> This seems to complicate the RTC based route propagation:
> - the RTC advertisements now need to include these new communities
> - a logical AND criteria is needed
> - if a route needs to go to several nodes, then each needs to be encoded
by the source and compared against on each hop.

It seems that this is yet one more example of RTC overload or to put it
more nicely extend its original scope to new use cases.

With that what seems to be advised is to perhaps spin off RTCv2, make it
TLV based and instead of hacks to skip one AFI/SAFI vs the other or worry
about RT uniqueness just distribute filters fitted to any specific AFI/SAFI.

But again this is all going wrong way as BGP is really not the right
protocol for any targetted data distribution.

Best,
R.

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