North American Network Operators Group|
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Re: honoring AS-path prepend from a peer or customer?
> done it such that we only did prefix filtering, not any as-path > filtering, this allows them to prepend as they wish, just not advert > anything other than what we filtered them at. FYI, this is dangerous. For example - You have a customer A who has a customer B. B is multi-homed to A and 701. B's link to A goes down. So, if A's network is broken, they will send you a given prefix with as-path ^701 B$ or ^1239 701 B$ or ..., depending on how B sees 701. And you will transit it. Shouldn't cause any major damage, but something to be aware of. > - Jared Avi