Below was from our provider for Chicago, its possible there may be some downtime but they do not plan on it.
We have scheduled network maintenance that applies to all customers. Date: Monday, September 13, 2021 Start Time: 9:00 AM CDT (UTC -5) End Time: 10:00 AM CDT (UTC -5) Maintenance Scope: This maintenance is designed to allow us to make configuration changes within our network. Customer Impact: While no customer impact is expected, we are scheduling this window to in the event there is an intermittent disruption.
Saturday, September 11, 2021