Say that Node A is connected to Node B via Interfaces A1 and B1, and SolarWinds know this from it's Network Topology feature.
You UnManage Node A due to maintenance and take it down. Normally Interface B1 will be down then also and possible trigger an alert, even though we knew about the maintenance and Unmanaged Node A.
Attached script mutes interfaces connected to unmanaged nodes and unmutes them as the node is up and managed again.
The script requires a custom property to store it's activity, see file for details.
The script is supposed to be scheduled to run every x minutes, for example every 10 minute.