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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical RE: RIR filtering & Level3
We're getting 231740 routes from Level(3) at this moment.... hit me offline with some specific prefixes and I'd be happy to share what we see...;) Paul Stewart Senior Network Administrator Nexicom 5 King St. E., Millbrook, ON, LOA 1GO Phone: 705-932-4127 Web: http://www.nexicom.net Nexicom - Connected. Naturally. -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Justin Shore Sent: Wednesday, November 14, 2007 9:43 PM To: [email protected] Subject: RIR filtering & Level3 Are any other L3 customers seeing the large number of /25 and smaller routes from L3? I'm seeing almost 2500 of these routes in 4/8, some but not as many in 8/8 and still more in L3's non-US allocations. Looking at the AS paths for a handful of those specific networks I only see them via our L3 connection and not via our other 2 upstreams. I'm seeing paths to the larger aggregate networks via our other upstreams of course; the Oregon and AT&T route servers see the same aggregates too. To be more accurate we actually touch L3's acquisition form a year or so ago, Telcove (19094). All of the small routes are originating from L3 though (3356). Best I can tell L3 is aggregating before it advertises to a peer but not before it advertises to a customer. Or, on the otherhand, perhaps L3 is advertising without aggregation to Telcove and Telcove is not aggregating before advertising to us. So, that said, what is everyone else doing to perform sanity checks on their learned routes? Are a good many implementing RIR filtering and dropping everything smaller than a /24? L3 of course isn't the only source of these tiny routes but it's so obvious I saw it and wasn't even looking for it. This would explain why I'm getting so many more routes from L3 too. I'm getting 232k from AT&T, 233.5k from Cox and 244k from L3. Thanks Justin ---------------------------------------------------------------------------- "The information transmitted is intended only for the person or entity to which it is addressed and contains confidential and/or privileged material. If you received this in error, please contact the sender immediately and then destroy this transmission, including all attachments, without copying, distributing or disclosing same. Thank you."
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