Hi,
The issue, like many others, comes from the trust-based nature of the
great internets.
Just because well-meaning networks have no reason to fake self-report as
Anycast, in the absence of a mechanism to actually validate that, some
less well-meaning networks could make the marking useless. The
communities are not only used for TE, so routing hot/cold/mashed
potatoes is just one way to use that info, among others. Then, the good
and fake information becomes useless bits moved around with BGP,
globally, or until some transit strips them.
I can imagine a bunch of people conducting "research" using something
like [1] to create an imaginary "Tier 1" on the Facebook-of-the-Internet
or other sites by marking all routes as Customer or Internal.
[1]
https://datatracker.ietf.org/doc/html/draft-ymbk-grow-bgp-collector-communities-02
Radu
On 11/25/2025 6:44 PM, Gert Doering wrote:
Why would they do that?
The idea about "tagging as anycast" is not to make other networks
prioritize these (and prioritize in which way, anyhow?) but to give
them the chance to do informed decisions on hot/cold-potato routing,
which might look different for anycast and for non-anycast prefixes - or,
when faced with "what looks like funny routing", to do better informing
debugging.
Gert Doering
-- NetMaster
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