Hi All! I'm trying to get a feeling for how often ISPs announce a prefix from different origin ASes intentionally.... (and why...) I asked this question on my peering survey (*grin*), but I thought i'd hit a wider audience... Thanks. -abha ;)
Abha, One of the origins :) of inconsistent routes is improper multihoming -- a network is multihomed but no public ASN is assigned to it; some private ASN is used and stripped off (by remove-private-as) at the edges of the both (or many) ISPs, which results in multiple origin ASs for the network prefix. I don't know how intentional this practice is, though :) The question about how bad inconsistent routes are was also addressed on this list. -- dima.
-----Original Message----- From: owner-nanog@merit.edu [mailto:owner-nanog@merit.edu]On Behalf Of abha Sent: Tuesday, January 09, 2001 7:02 PM To: nanog@merit.edu Subject: multiple origin ASes
Hi All!
I'm trying to get a feeling for how often ISPs announce a prefix from different origin ASes intentionally.... (and why...)
I asked this question on my peering survey (*grin*), but I thought i'd hit a wider audience...
Thanks.
-abha ;)
Hi Dima...
One of the origins :) of inconsistent routes is improper multihoming -- a network is multihomed but no public ASN is assigned to it; some private ASN is used and stripped off (by remove-private-as) at the edges of the both (or many) ISPs, which results in multiple origin ASs for the network prefix. I don't know how intentional this practice is, though :)
Yeah. I know about that origin of inconsistent ASes. I'm more curious about other creative occurences... Thanks! -abha ;)
The question about how bad inconsistent routes are was also addressed on this list. -- dima.
-----Original Message----- From: owner-nanog@merit.edu [mailto:owner-nanog@merit.edu]On Behalf Of abha Sent: Tuesday, January 09, 2001 7:02 PM To: nanog@merit.edu Subject: multiple origin ASes
Hi All!
I'm trying to get a feeling for how often ISPs announce a prefix from different origin ASes intentionally.... (and why...)
I asked this question on my peering survey (*grin*), but I thought i'd hit a wider audience...
Thanks.
-abha ;)
"a" == abha <ahuja@wibh.net> writes: Yeah. I know about that origin of inconsistent ASes. I'm more curious about other creative occurences...
Some Exchange Point LANs don't have a well-defined origin AS, so if multiple ISPs want to provide transit to the LAN, they'll announce it from their respective AS and it will show up under multiple origins. 198.32.162.0/24 (Oregon-IX) and 194.42.48.0/24 (TIX Zurich) are two examples of this. -- Simon.
participants (4)
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abha -
Dmitri Krioukov -
Randy Bush -
Simon Leinen