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Re: Routing loop between Qwest and Sprint?

  • From: Sean Donelan
  • Date: Tue May 18 16:30:18 1999

>That'd lead me to believe that it's likely an issue internal to Sprint's 
>network, perhaps your query would be best directed to their NOC, versus NANOG. 
> I'd guess the greater majority of the NANOG distribution doesn't have access 
>to Sprint routers, so it's unlikely that they'll be able to correct the 
>problem.
>
>Directing your query to the Sprint NOC, or even Qwest NOC, is definitely much 
>more appropriate, assuming your concern is wrt regaining connectivity this 
>destination..

I tried opening a ticket by phone with Qwest's NOC.  Guess what, I'm
not a Qwest customer, so they couldn't find my account.  I did send a
message to Sprint.  I haven't received a response from Sprint yet.  I
think if you check around, you'll find for those providers I have
agreements with, I usually work out hairy problems with their senior
network engineers pretty quickly, in private.  For those providers who
ditch me at their first-level support, I don't see an issue with bringing
up the problem in other forum because I've found it helps get the problem
fixed.

However, like many things with routing, it is a bit simplistic to just
say it is an issue internal to Sprint's network.  It usually takes two
providers to screw up inter-provider routing.

This particular type of routing problem isn't that unusual, but it always
seems to take a day for the two providers to stop saying call the other
provider, and to actually clean everything up.  It appears that Qwest
announced a large set of more specific routes at one point in time for
the CIDR block 205.169.0.0/16.  Qwest tried to correct this at a later
point, but it appears the problem in the software on some Sprint routers
lost some of the route withdraws.


odra-22>show ip bgp 205.169.153.240 255.255.0.0 longer
[...]
   Network          Next Hop            Metric LocPrf Weight Path
*>i205.169.0.0/16   192.41.177.120                100      0 286 209 i
*                   204.70.27.9                    90      0 3561 209 i
*                   144.232.129.97                 90      0 1239 209 i
*> 205.169.17.0     144.232.129.97                 90      0 1239 209 i
*>i205.169.19.0     192.41.177.120                100      0 286 209 104 i
*                   204.70.27.9                    90      0 3561 209 104 i
*                   144.232.129.97                 90      0 1239 209 104 i
*> 205.169.20.0     144.232.129.97                 90      0 1239 209 i
*> 205.169.21.0     144.232.129.97                 90      0 1239 209 i
*> 205.169.22.0     144.232.129.97                 90      0 1239 209 i
*> 205.169.23.0     144.232.129.97                 90      0 1239 209 i
*> 205.169.24.0     144.232.129.97                 90      0 1239 209 i
*> 205.169.25.0     144.232.129.97                 90      0 1239 209 i
*> 205.169.26.0     144.232.129.97                 90      0 1239 209 i
*> 205.169.27.0     144.232.129.97                 90      0 1239 209 i
*> 205.169.28.0     144.232.129.97                 90      0 1239 209 i
*> 205.169.29.0     144.232.129.97                 90      0 1239 209 i
*> 205.169.30.0     144.232.129.97                 90      0 1239 209 i
*> 205.169.37.0     144.232.129.97                 90      0 1239 209 i
*> 205.169.39.0     144.232.129.97                 90      0 1239 209 i
*> 205.169.40.0     144.232.129.97                 90      0 1239 209 i
*> 205.169.41.0     144.232.129.97                 90      0 1239 209 i
*> 205.169.42.0     144.232.129.97                 90      0 1239 209 i
*> 205.169.43.0     144.232.129.97                 90      0 1239 209 i
*> 205.169.45.0     144.232.129.97                 90      0 1239 209 i
*>i205.169.47.0     192.41.177.120                100      0 286 209 i
*                   144.232.129.97                 90      0 1239 209 i
*                   204.70.27.9                    90      0 3561 209 i
*> 205.169.48.0     144.232.129.97                 90      0 1239 209 i
*> 205.169.49.0     144.232.129.97                 90      0 1239 209 i
*> 205.169.50.0     144.232.129.97                 90      0 1239 209 i
*> 205.169.51.0     144.232.129.97                 90      0 1239 209 i
*> 205.169.54.0     144.232.129.97                 90      0 1239 209 i
*> 205.169.55.0     144.232.129.97                 90      0 1239 209 i
*> 205.169.63.0     144.232.129.97                 90      0 1239 209 i
*> 205.169.68.0     144.232.129.97                 90      0 1239 209 i
*> 205.169.97.0     144.232.129.97                 90      0 1239 209 i
*> 205.169.101.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.102.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.105.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.106.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.107.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.108.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.112.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.121.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.122.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.123.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.124.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.127.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.134.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.136.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.137.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.149.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.153.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.155.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.158.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.160.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.163.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.164.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.165.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.166.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.170.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.171.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.174.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.175.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.177.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.179.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.180.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.185.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.188.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.192.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.198.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.199.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.200.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.201.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.203.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.204.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.205.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.206.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.207.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.208.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.210.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.219.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.222.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.223.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.226.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.227.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.228.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.231.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.232.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.233.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.234.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.235.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.237.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.239.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.245.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.247.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.251.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.252.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.254.0    144.232.129.97                 90      0 1239 209 i
odra-22> q


later in the day, after my nanog message, it appears someone cleaned up
that particular route.  Notice the difference in the table below, 
205.269.153.0 is no longer listed as a more specific.  However, the other
more specifics continued to be announced by Sprint.



odra-22>show ip bgp 205.169.153.240 255.255.0.0 longer
[...]
   Network          Next Hop            Metric LocPrf Weight Path
*>i205.169.0.0/16   192.41.177.120                100      0 286 209 i
*                   204.70.27.9                    90      0 3561 209 i
*                   144.232.129.97                 90      0 1239 209 i
*> 205.169.17.0     144.232.129.97                 90      0 1239 209 i
*>i205.169.19.0     192.41.177.120                100      0 286 209 104 i
*                   204.70.27.9                    90      0 3561 209 104 i
*                   144.232.129.97                 90      0 1239 209 104 i
*> 205.169.20.0     144.232.129.97                 90      0 1239 209 i
*> 205.169.21.0     144.232.129.97                 90      0 1239 209 i
*> 205.169.22.0     144.232.129.97                 90      0 1239 209 i
*> 205.169.23.0     144.232.129.97                 90      0 1239 209 i
*> 205.169.24.0     144.232.129.97                 90      0 1239 209 i
*> 205.169.25.0     144.232.129.97                 90      0 1239 209 i
*> 205.169.26.0     144.232.129.97                 90      0 1239 209 i
*> 205.169.27.0     144.232.129.97                 90      0 1239 209 i
*> 205.169.28.0     144.232.129.97                 90      0 1239 209 i
*> 205.169.29.0     144.232.129.97                 90      0 1239 209 i
*> 205.169.30.0     144.232.129.97                 90      0 1239 209 i
*> 205.169.37.0     144.232.129.97                 90      0 1239 209 i
*> 205.169.39.0     144.232.129.97                 90      0 1239 209 i
*> 205.169.40.0     144.232.129.97                 90      0 1239 209 i
*> 205.169.41.0     144.232.129.97                 90      0 1239 209 i
*> 205.169.42.0     144.232.129.97                 90      0 1239 209 i
*> 205.169.43.0     144.232.129.97                 90      0 1239 209 i
*> 205.169.45.0     144.232.129.97                 90      0 1239 209 i
*>i205.169.47.0     192.41.177.120                100      0 286 209 i
*                   144.232.129.97                 90      0 1239 209 i
*                   204.70.27.9                    90      0 3561 209 i
*> 205.169.48.0     144.232.129.97                 90      0 1239 209 i
*> 205.169.49.0     144.232.129.97                 90      0 1239 209 i
*> 205.169.50.0     144.232.129.97                 90      0 1239 209 i
*> 205.169.51.0     144.232.129.97                 90      0 1239 209 i
*> 205.169.54.0     144.232.129.97                 90      0 1239 209 i
*> 205.169.55.0     144.232.129.97                 90      0 1239 209 i
*> 205.169.63.0     144.232.129.97                 90      0 1239 209 i
*> 205.169.68.0     144.232.129.97                 90      0 1239 209 i
*> 205.169.97.0     144.232.129.97                 90      0 1239 209 i
*> 205.169.101.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.102.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.105.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.106.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.107.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.108.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.112.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.121.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.122.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.123.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.124.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.127.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.134.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.136.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.137.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.149.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.153.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.155.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.158.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.160.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.163.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.164.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.165.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.166.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.170.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.171.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.174.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.175.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.177.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.179.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.180.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.185.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.188.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.192.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.198.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.199.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.200.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.201.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.203.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.204.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.205.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.206.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.207.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.208.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.210.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.219.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.222.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.223.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.226.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.227.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.228.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.231.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.232.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.233.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.234.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.235.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.237.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.239.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.245.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.247.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.251.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.252.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.254.0    144.232.129.97                 90      0 1239 209 i
odra-22> q


This afternoon, it appears someone has done some more cleanup.  But hasn't
gotten all of the more specifics yet.


odra-22>show ip bgp 205.169.153.240 255.255.0.0 longer
[...]
   Network          Next Hop            Metric LocPrf Weight Path
*>i205.169.0.0/16   192.41.177.120                100      0 286 209 i
*                   204.70.27.9                    90      0 3561 209 i
*                   144.232.129.97                 90      0 1239 209 i
*>i205.169.19.0     192.41.177.120                100      0 286 209 104 i
*                   204.70.27.9                    90      0 3561 209 104 i
*                   144.232.129.97                 90      0 1239 209 104 i
*> 205.169.20.0     144.232.129.97                 90      0 1239 209 i
*>i205.169.47.0     192.41.177.120                100      0 286 209 i
*                   144.232.129.97                 90      0 1239 209 i
*                   204.70.27.9                    90      0 3561 209 i
*> 205.169.48.0     144.232.129.97                 90      0 1239 209 i
*> 205.169.49.0     144.232.129.97                 90      0 1239 209 i
*> 205.169.50.0     144.232.129.97                 90      0 1239 209 i
*> 205.169.51.0     144.232.129.97                 90      0 1239 209 i
*> 205.169.54.0     144.232.129.97                 90      0 1239 209 i
*> 205.169.121.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.134.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.164.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.223.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.237.0    144.232.129.97                 90      0 1239 209 i
*> 205.169.239.0    144.232.129.97                 90      0 1239 209 i
odra-22>q

-- 
Sean Donelan, Data Research Associates, Inc, St. Louis, MO
  Affiliation given for identification not representation