[155883] in North American Network Operators' Group
RE: Level 3 BGP Advertisements
daemon@ATHENA.MIT.EDU (Hale, William C)
Wed Aug 29 15:54:18 2012
From: "Hale, William C" <William.C.Hale@windstream.com>
To: "nick@flhsi.com" <nick@flhsi.com>, "nanog@nanog.org" <nanog@nanog.org>
Date: Wed, 29 Aug 2012 14:52:10 -0500
In-Reply-To: <12eb921c$6a0de4a3$7efc90a$@flhsi.com>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
No, that's not standard practice. I do this exact thing with Level 3 and h=
ave been for many many many years. Whoever is telling you this must be gre=
en.
I would recommend adding the no-export community to your more specific rout=
es if you can so as to be a good steward of the ever growing Internet IPv4 =
table.
________________________________________
From: Nick Olsen [nick@flhsi.com]
Sent: Wednesday, August 29, 2012 2:28 PM
To: nanog@nanog.org
Subject: Level 3 BGP Advertisements
Greetings all.
In practice, We've always advertised our space all the way down to /24's
but also the aggregate block (the /20 or the /21). Just so there was still
reachability to our network in the event that someone made the foolish
mistake of filtering lets say prefixes smaller /23...
Anyways, I've always thought that was standard practice. And its never been
a problem. Until we brought up peering with level 3..
I noticed that while the /24's made it out to the world. The larger
counterparts (2 /21's and a /20) did not. So, I start sniffing around. Find
that I do indeed see the prefixes in Level 3's looking glass but they
aren't handing it off to peers. So, Naturally, I land on this being some
kind of prefix filtering issue and open a ticket with Level 3. They tell me
this is standard practice. And If I want to see the /20 or /21's make it
out to the rest of the world, I need to stop sending the /24's.
Does this sound normal?
Is what I'm doing (Advertising the aggregate prefix) a good rule of thumb?
Any other thoughts?
Nick Olsen
Network Operations (855) FLSPEED x106
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