The Cidr Report - 4byte ASN handling
mtinka at globaltransit.net
Fri Sep 16 18:11:24 UTC 2011
On Friday, September 16, 2011 07:51:04 AM Schiller, Heather
> I thought AS-plain notation was the standard for 4-byte
as-plain is not the "standard" per se. Think of it more as
the "preferred" option within the industry.
o All major vendors support it, so there's no need
to convert to as-dot when you upgrade your router
software to support 4-byte ASN's.
o as-plain doesn't break your AS_PATH regular
expressions, which is very useful.
o as-plain is a known representation format among
operators, and 4-byte ASN's continuing this
tradition keeps the network stable.
as-dot notation looks really Cool & Sexy (tm), but is
cumbersome for your AS_PATH regular expressions. It doesn't
make things impossible, just, well, cumbersome :-).
Hope this helps.
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