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Re: [Lsr] Prefix Unreachable Announcement Use Cases

Robert Raszuk <robert@raszuk.net> Tue, 17 November 2020 14:43 UTC

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From: Robert Raszuk <robert@raszuk.net>
Date: Tue, 17 Nov 2020 15:42:54 +0100
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To: Gyan Mishra <hayabusagsm@gmail.com>
Cc: "Acee Lindem (acee)" <acee=40cisco.com@dmarc.ietf.org>, Aijun Wang <wangaijun@tsinghua.org.cn>, Jeff Tantsura <jefftant.ietf@gmail.com>, lsr <lsr@ietf.org>
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Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases
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Hi Gyan,

      Gyan>. We could use Aijun’s passive interface new top level TLV to
> link the next hop rewrite loopback to the PE-CE links all being set to
> passive. So if any PE-CE link goes down a PUA is sent and the next hop
> converges PIC core PE-CE link which is now associated with the Loopback.
> This would be a major benefit of PUA for PIC core convergence when
> next-hop-self is used which applies to MPLS and SR and IP based core.
>

I have read the above three sentences five times and came with two basic
observations:

* You are mixing PIC Core with PIC Edge - Please do not. Those are
completely separate features and it is a feature not a bug to keep them
that way.

* You are mixing external PE-CE interfaces with IGP passive interfaces -
Please do not. There should be no IGP flooding of any sort associated with
state of PE-CE interface. No need.

Thx a lot,
R.

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