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Re: [Lsr] New Version Notification for draft-wang-lsr-prefix-unreachable-annoucement-03.txt

Robert Raszuk <robert@raszuk.net> Mon, 07 September 2020 08:53 UTC

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From: Robert Raszuk <robert@raszuk.net>
Date: Mon, 07 Sep 2020 10:53:32 +0200
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To: Aijun Wang <wangaijun@tsinghua.org.cn>
Cc: Gyan Mishra <hayabusagsm@gmail.com>, "Acee Lindem (acee)" <acee@cisco.com>, "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, Tony Przygienda <tonysietf@gmail.com>, Huzhibo <huzhibo@huawei.com>, Aijun Wang <wangaj3@chinatelecom.cn>, Peter Psenak <ppsenak=40cisco.com@dmarc.ietf.org>, lsr <lsr@ietf.org>, Xiaoyaqun <xiaoyaqun@huawei.com>
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Subject: Re: [Lsr] New Version Notification for draft-wang-lsr-prefix-unreachable-annoucement-03.txt
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Hi Aijun,

> *[WAJ] If necessary, we can advertise the MAX_T_PUA(configurable time for
> the hold of PUA information on the nodes) among the area.*
>
> *If one node connect to the network after the disappearance of the PUA
> destination,  there will be no services can be established/run on these
> failure node/link prefix. *
>
> *It’s the same as the beginning, as not all of the prefixes can be
> reachable within the summary address.*
>
>
>From my pov the only advantage of negative routes in IGP would be to very
quickly invalidate service routes (within the IGP domain) typically carried
by BGP.

When this is accomplished the PUA can indeed time out with no harm.

Said this - now considering tools like next hop tracking which can trigger
withdraw or aggregated withdraw(*) proposal in src area I am  really
curious how much (if anything) we would be gaining here.

(*) The original proposal for this was written over 15 years ago:
https://tools.ietf.org/html/draft-raszuk-aggr-withdraw-00  We could extend
it with next hop which would be the same as IGP PUA prefix.

Kind regards,
Robert

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