Dell have identified a fatal and uncorrectable bug in the ARM chipsets of our Nectar switches. They have shipped us replacements, which we will urgently swap out. Our Network environment is configured as highly available, and there should be no downtime or impact to researchers during these swaps.
This is scheduled to begin at 1PM NZT on 20/11, and will complete by COB. If there are any escalating issues, we will make the community aware, and update.