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

Mike Hammett nanog at
Wed Sep 9 11:41:10 UTC 2020

How is that any different than any other network with minimal connectivity (say a non-ISP such as a school, medium business, local government, etc.)? 

Also, it would likely help that new ISP in Myanmar learn their limited upstream's communities if there were a standard. 

Mike Hammett 
Intelligent Computing Solutions 


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

From: "Mark Tinka via NANOG" <nanog at> 
To: nanog at 
Sent: Tuesday, September 8, 2020 11:28:48 PM 
Subject: Re: BGP Community - AS0 is de-facto "no-export-to" marker - Any ASN reserved to "export-only-to"?' 

On 8/Sep/20 22:02, Tom Beecher via NANOG wrote: 

> I also get that intent from the OP. However I disagree that there 
> should be a 'de facto' standard created for such things. All flavors 
> of BGP community specifications are designed to be flexible so that 
> different networks can design a system that is tailored to their needs. 
> Having 'de facto' standards does not simplify in my opinion. I 
> believe it just creates more work for operators trying to navigate 
> around different opinions of what 'de facto' means. 


Consider a new ISP starting operations in Myanmar, with little or no 
global peering, having to wade through tons of information to design 
their BGP community structure based on a "de facto" standard defined by 
a group of ISP's half-way around the world. 

What's the real value? 


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