BGP prefix filter list

Mike Hammett nanog at
Wed May 15 13:56:01 UTC 2019

What is the most common platform people are using with such limitations? How long ago was it deprecated? 

Mike Hammett 
Intelligent Computing Solutions 


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

From: "Baldur Norddahl" <baldur.norddahl at> 
To: nanog at 
Sent: Wednesday, May 15, 2019 6:43:30 AM 
Subject: BGP prefix filter list 


This morning we apparently had a problem with our routers not handling 
the full table. So I am looking into culling the least useful prefixes 
from our tables. I can hardly be the first one to take on that kind of 
project, and I am wondering if there is a ready made prefix list or similar? 

Or maybe we have a list of worst offenders? I am looking for ASN that 
announces a lot of unnecessary /24 prefixes and which happens to be far 
away from us? I would filter those to something like /20 and then just 
have a default route to catch all. 



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