If Globex is down, no way the E-minis can be traded.
If it's an outage of Globex's connection to certain routers, hubs, etc., E-minis may continue to trade, but certain brokers affected may not be able to access Globex. In this case, some affected brokers may activate alternate order routing system or place orders via other unaffected brokers.
If Globex's market data feed goes down, trades may continue as normal, but your quote machine(s) will have no update of any Globex-traded instruments.
One thing is certain for Globex: there's quote update, there's trading. Not true in reverse.
As to 11:XX this morning, both Reuters Terminal and FutureSource have gaps in their 1 minute charts for E-minis. I believe IB's Bulletins regarding Globex are correct. I'm out of town during that period.