Hey folks - Is the second instance of "BLACKHOLE" meant to be "DOWNGRADE" here in section 3.4?
"Similar to how IX RS ought to pass through the BLACKHOLE community (see Section 3.3), the global Internet routing system as a whole likely benefits from downgrading close to the traffic source. Operators SHOULD NOT remove the BLACKHOLE community from route announcements." -- Bryton Herdes Principal Network Engineer AS13335 - Cloudflare On Tue, Aug 4, 2026 at 2:44 PM Job Snijders <[email protected]> wrote: > Dear all, > > Following up on a recent NANOG thread on RTBH [1], [2]; 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. > > Please 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 > > [1]: > https://lists.nanog.org/archives/list/[email protected]/message/LOWUU7RHOKTYKVGWRHNXQJ3GSJYN3HLE/ > [2]: > https://lists.nanog.org/archives/list/[email protected]/message/ITDOCC6N5VELZ56F6ILVZODZSUWH3TNE/ > > _______________________________________________ > GROW mailing list -- [email protected] > To unsubscribe send an email to [email protected] >
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