North American Network Operators Group

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RE: Level3 / Qwest routing issues earlier today?

  • From: David Hubbard
  • Date: Thu Jul 26 16:38:25 2007

From: Chris Riling
> Hi Guys,
>      Was anyone else seeing anything weird going on today? I 
> have an OC-3 to Qwest, and another OC-3 to Level3, (among 2 
> others to different providers) and when all was well, I was 
> receiving a little over 221,000 prefixes from L3. Then, 
> intermittently I would start losing prefixes from L3 and it 
> would get down to a little over 220,000. When this happened, 
> I noticed I was having intermittent connectivity issues 
> (atleast to one IP I was trying to get to). Doing a 
> traceroute during the "outage" the packets would hit Qwest's 
> network, then L3's, then drop, or sometimes not. I have since 
> admin downed my BGP peer to L3 and everything  has 
> stabilized, but I was wondering if anyone else saw anything going on? 

I think there was something going on between Qwest and L3,
I saw the same thing with traffic coming from a network I
have equipment on which is connected with Qwest and tracing
to our home AS which has L3 amongst others.  I set a
community for L3 to not advertise my prefixes to Qwest to
get around it.  It appears back to normal now though, I
just tested.