Jan Zorz - Go6 wrote on 27/11/2025 13:33:
No-export to that tier1 fixed the problem, but still...
you're fortunate that no-export solved it. Some people strip off all
communities on ingress - including no-export.
IOW, this is a signaling mechanism. You can raise a signal, but you
shouldn't depend on other people seeing it or reacting to it. In real
life, once a prefix passes outside your own network, all bets are off.
I.e. networks should consider carefully whether or not to depend on
signaling like this as a reliable mechanism for traffic control.
Nick
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