Scheduled Service Change: Upgrade of Tier1 network switches in Server Farm
Services on servers that are single attached to Tier 1 will have a 5-10 minute outage at some point during the 2 hour maintenance window. Tier1 is the main tier and several services will be effected.
There is no workaround for this issue
Update of Server Farm network switches. Some central campus services will not be available for 5-10 minutes at some point between 5-7am on December 22.