The Cidr Report - 4byte ASN handling

[mtinka at globaltransit.net (Mark Tinka)]

On Friday, September 16, 2011 07:51:04 AM Schiller, Heather 
A wrote:

> I thought AS-plain notation was the standard for 4-byte
> ASN's?

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.

Cheers,

Mark.	
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 836 bytes
Desc: This is a digitally signed message part.
URL: <http://mailman.nanog.org/pipermail/nanog/attachments/20110917/fda52677/attachment-0001.bin>