My best parsing of that ticket, with some guesses :
- Infinera management card goes Really Bad, knocks out local waves, and starts spewing garbage out onto the management network
- Management network propagates the garbage , other Infinera management cards get it and fall into the same state, knocking down local waves and re-spewing garbage.
- Backup tunnels in place to ensure management network connectivity works all the time help propagate the garbage.
- They start getting into some devices via OOB, probably rebooting. Devices come up ok, then this garbage traffic knocks them over again.
- They start pulling down the backup tunnels to stop the virus from spreading, bouncing stuff again, putting filters on each device to drop the garbage traffic.
- This starts to work, but then they hit other problems with linecards from devices that were bounced.
- They also start hitting sites that they don't have functional OOB for, and have to get someone driving out to manually get access into.