BGP Community - AS0 is de-facto "no-export-to" marker - Any ASN reserved to "export-only-to"?'

Mike Hammett nanog at
Wed Sep 9 15:52:46 UTC 2020

No, but most network operators also aren't NANOG members, attend NANOG shows, subscribe to NANOG lists. 

They're small outfits where there's between 1 - 5 total networking people. 

Circling back to earlier where I said there are almost 70k ASNs in use on the public Internet. Most of those operators don't have complex configurations. I'd be surprised if less than half of them had anything more than the most minimal default route configuration. 

Mike Hammett 
Intelligent Computing Solutions 


----- Original Message -----

From: "Mark Tinka" <mark.tinka at> 
To: "Mike Hammett" <nanog at> 
Cc: nanog at 
Sent: Wednesday, September 9, 2020 8:13:32 AM 
Subject: Re: BGP Community - AS0 is de-facto "no-export-to" marker - Any ASN reserved to "export-only-to"?' 

On 9/Sep/20 15:06, Mike Hammett wrote: 

More operators don't use communities internally than the number of operators that do. 

Do you have some empirical data on that? 

I don't know if it's more, or less. But as Charlton Heston said in "True Lies": 

"So far this is not blowing my skirt up, gentlemen. Don't you have anything remotely substantial, Harry? Do you have any HARD DATA?" 



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