On Thursday, December 11, 2014 05:55:26 PM ML wrote: > There are sloppy networks out there. If it was a big > enough problem all you'd need is a few key networks drop > those prefixes and we'd have a...slightly less sloppy > Internet?
Router software (speaking of Cisco and Juniper in this case) has developed reasonably well that one can now strip private ASN's from the AS_PATH even though they now appear in between public ASN's. This was not possible before, as private AS filtering was only possible if they appeared contiguously in the AS_PATH. Of course, this means running later code - but chances are that if you're running code that supports 4-byte ASN's, you might have this feature. Not sure about other vendors out there. We, for example, remove private ASN's by default on all eBGP sessions. I know several other providers that do the same - but it takes a village to raise the Internet... Mark.
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