AS path weirdness
andy at nosignal.org
Mon Mar 23 07:40:38 UTC 2009
On 21 Mar 2009, at 02:48, Jason Lewis wrote:
> I'm not entirely sure what I'm looking at. The reserved AS, 65490
> appears in parentheses and I've never seen that in MRT formatted
> data and not sure why it's happening.
This has been observed when a vendor runs 32-bit AS aware code on part
of their edge, and non-32-bit AS aware code on a different part of
> I'm also not clear on why I see 23456 *and* a 32 bit AS in the
> path. Is anyone else seeing this or is it something wacky at RRC04?
> 126.96.36.199/23|29222 6830 (65490) 3356 35320 3.21 23456
There's some history with this prefix.
http://www.andyd.net/media/talks/asn4_breaks_network.pdf [from nanog45]
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