Well,
You are correct on the translation---
Finally heard back from all players.
And someone “properly” summarized the prefixes.
Initially they were sent as 4 /24’s due to data center disparity
and a route policy.
But in the end someone at the 1st upstream summarized
the routes to their upstreams.
And when the 1st upstream realized they should not be
summarizing and changed that- their upstreams blocked the traffic.
Go figure..
Thanks for the input guys!
Jim
From: Warren Kumari
[mailto:warren@kumari.net]
Sent: Monday, October 29, 2007 3:54 PM
To: Jim McBurnett
Cc: nanog@nanog.org
Subject: Re: BGP Peering and Prefix filterin Question
I'm suspecting that the customers problem was BGP Flap
Damping (or Dampening) and that somehow the explanation got lost in translation
somewhere (I've tried explaining it to some non-engineers sometimes and it is a
tricky concept for many to grasp for some reason...)
Whether its "normal" or a good idea or who does /
doesn't do it is a topic fraught with religion....
Warren
On Oct 29, 2007, at 2:15 PM, Jim McBurnett wrote:
Hello,
Recently I have been told that some ISP’s are automatically or
maybe manually modifying their BGP inbound prefix listing after a network is
not advertised to them for a period of time.
So the questions I pose to the group:
1. Is this normal?
2. Can anyone share your policies?
3. Who does it?
4. How often?
5. Is it automagic? Or the dirty work slaved off to the junior
engineer in the corner somewhere?
a. I know you probably won’t trust that junior engineer, but some do….
Anyway just a little research after a small problem a customer
recently had.
Thanks,
Jim
--
She'd even given herself a middle initial - X - which stood for
"someone who has a cool and exciting middle name".
--
(Terry Pratchett, Maskerade)