SUMMARY: Strange BGP phantom announce remaining

[Stephane Bortzmeyer <bortzmeyer () gitoyen net>]

First, the problem disappeared because Colt cleared the router which
was deceived by a bogus announce from Telecom Italia. Thanks.

On Mon, Nov 12, 2001 at 03:16:14PM +0100,
 Stephane Bortzmeyer <bortzmeyer () gitoyen net> wrote 
 a message of 33 lines which said:

> I probably made a stupid mistake when changing my BGP announces but I

Apparently, I made no mistake. According to analysis done by Jim Cowie
with data at http://gradus.renesys.com, the change was properly
done. But at least one router in Telecom Italia did not receive it.

There was nothing we could do, since it took place at a far away
location. Without the action from Colt, we could have try to
re-announce the more specific route for ten minutes (let it
propagate), then to withdraw it again, hoping it will clear it. Next
time, I'll try :-)

> Does you have any idea why routers at Colt still see the old announce?

The question should have been "Why routers at Telecom Italia corrupted
Colt's database?". I received two hypothesis: