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flap flap: AS 10916

  • From: Kai Schlichting
  • Date: Fri Aug 11 15:15:25 2000 
A heavily flapping AS struck my curiosity: AS 10916.

Somehow, AS 6138 constantly appears and disappears out of the
path leading through AS 1239 - the other path to them via AS 701
is barely flapping at all.

#  sh ip bgp regexp 10916
[...]
   Network          Next Hop         Metric LocPrf Weight Path
*d 63.87.96.0/24    censored             95    110      0 13789 1239 10916 i
*>                  censored             98    100      0 701 10916 i
[...]

And every few minutes:

*d 63.87.96.0/24    censored             95    110      0 13789 1239 6138 10916 i
*>                  censored             98    100      0 701 10916 i
[...]

What could be the cause for an AS appearing/disappearing in a path
every few minutes? Is it really AS 6138 that is flapping for 10916?
For some reason they prefer the indirect route through 6138 to 1239
(SprintLink), instead of their direct connection to 1239. These are
the times when such a peer should be shut down for the sanity of the
rest of the network.

bye,Kai