Re: how about a well-known DOWNGRADE BGP Community? (Was: RTBH Support Across the Industry)

[jim deleskie via NANOG <nanog () lists nanog org>]

I fully support this direction.

Job, anything I can do to assist, let me know please

-jim

On Tue, Aug 4, 2026 at 9:38 AM Job Snijders via NANOG <nanog () lists nanog org>
wrote:

> Dear all,
>
> Following up on the RTBH thread, we'd like to put forward an different
> strategy for DoS attack mitigation. Perhaps just as an extra tool in the
> toolbox.
>
>    Abstract --
>    This document outlines a method to mitigate Denial of Service (DoS)
>    attacks by using a well-known BGP community named "DOWNGRADE" as signal
>    to neighboring networks to treat traffic destined towards "DOWNGRADE"
>    tagged IP prefixes with low precedence. The "downgrade" strategy
>    offers an appealing alternative to Remote Triggered Blackhole (RTBH)
>    filtering, because RTBH filtering completes the DoS attack and hampers
>    the defender's ability to monitor whether the attack is still ongoing.
>
> Read the full draft document here:
>
>
> https://datatracker.ietf.org/doc/html/draft-spaghetti-grow-downgrade-bgp-community
>
> Your feedback is most welcome!
>
> Kind regards,
>
> Job
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