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Consistent routing policy?

> https://archive.nanog.org/meetings/nanog40/presentations/BGPcommunities.pdf

Donâ??t let anyone send you Informational tags, these should only be set by
> you, and you should strip them from all BGP neighbors (customers, transits,
> peers, etc). Otherwise you have a massive security problem.

I often see informational tags propagated through multiple ASes. What is
the security risk there?
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