Re: [outages] Major Level3 (CenturyLink) Issues

["Dantzig, Brian" <bdantzig () medline com>]

Cisco had a bug a few years back that affected metro switches such that they would not withdraw routes upstream. We had 
an internal outage and one of my carriers kept advertising our prefixes even though we withdrew the routes. We tried 
downing the neighbor and even shutting down the physical interface to no avail. The carrier kept blackholing us until 
they shut down on their metro switch.