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There are ways to get around this (as-path filtering, maximum-paths, etc) that aren't as nazi as one would hope, but will prevent stupidity and provide sanity checking.

Maximum paths deals primarily with ibgp

Well, thats patently wrong. I don't know how else to respond to this.

It's actually "maximum-prefix" in Cisco parlance, perhaps this introduced the confusion. As for Verio's policy of filtering based on registry allocations, I know of several other providers that implement it as well, and have for quite a while. -danny