[Q] BGP filtering policies
We were recently assigned a /22 from UUNet in conjunction with some transit we're buying from them. The space is inside their superblock, 65.242.0.0/14. We are concerned that our route announcement of this block would be filtered out by some other providers, as it's not class C/swamp space (or even class B space for that matter). Verio's current policy, for one, indicates that this would be so. This is of particular concern to us as our little network encompasses several physical partially-meshed locations, with a mix of varying bandwidths both upstream as well as intra-location. Traffic Engineering is what we think is a reasonable (business) approach to address our flexibility needs, and so we're trying to move to address space(s) that would be least likely to be BGP filtered. We've asked for a different block from UUNet but the request didn't meet with success; UUNet suggested that any problems encountered as a result of this allocation could probably solved by e-mailing any NSP whose traffic interchange with us might be negatively affected (unlikely, to be sure, but still...), and would then change their filter (I'm unconvinced of this scenario). I briefly browsed the NANOG archives, and didn't see this issue discussed recently. Have the BGP filtering policies for "most" ISP/NSP's been relaxed to the level of "accept /24's from class A (ARIN-allocated) space"? Am I mis-reading Verio's posted policy? Is there anyone from UUNet who might choose to comment? Is there something else I'm misunderstanding? -- Henry Yen Aegis Information Systems, Inc. Senior Systems Programmer Hicksville, New York
I'm listening intently, here. I have an even smaller block from UUnet (63.107.133.0/24) in what ARIN declares to be a /20 CIDR block, and I'm having the devil of a time getting Level3 (my other <provider>) to actually announce this route. UUnet has time and again told me that they need do nothing for this to Just Work. I thought my problem was in getting through to Level3 (via Meer.net) but maybe this is germane. I'm frankly at a loss to explain why I don't see my route with Level3's AS in its path. I used to know how this stuff worked, up to a point, back in about 1995, but I'm obviously rusty.
participants (2)
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Henry Yen
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Jim Hickstein