[c-nsp] Default Route recalculated every 60 seconds.

[Gert Doering]

Hi,

On Mon, Apr 20, 2020 at 08:54:27PM +0000, Bradley Ordner wrote:
> Thanks Gert, I will now ask them to do packet capture on their side and see if they are advertising this default to any other customer every 60 seconds. 
> 
> Something else I noticed, we only accept routes less than or equal to /18. I noticed that many updates come in, for different prefixes. I can???t see how the Internet could be that unstable unless there is something wrong with their network. Wonder what is the norm when seeing so many prefixes change. 

The Internet is huge - 70.000 networks(!) connected together.  Things
are rebuilt and changed all over the place all the time, and links and
devices fail and get repaired all over the time.

So yes, there's a constant stream of BGP updates.

Google for Geoff Huston.  He's done a number of very good presentation
on the dynamics of BGP updates over time.

gert
-- 
"If was one thing all people took for granted, was conviction that if you 
 feed honest figures into a computer, honest figures come out. Never doubted 
 it myself till I met a computer with a sense of humor."
                             Robert A. Heinlein, The Moon is a Harsh Mistress

Gert Doering - Munich, Germany                             gert at greenie.muc.de
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