Update 2015-12-17: due to unforeseen circumstances this maintenance window has been rescheduled for 2015-12-21 23:00 CET.
Window: 2015-12-17 23:00 CET to 2015-12-18 05:00 CET
Reason: Change in network topology, uplinks will be reconnected to new switches.
Expected impact: None, redundant uplinks will be migrated one at a time. As with any change, there is a risk of unexpected consequences. If the Spanning Tree protocol does not correctly fail over our connection to the new upstream switch, we can expect an interruption of approximately 5 minutes.