This object holds a bitmap list of ports assigned to a specific port-isolation configuration entry, controlling which ports are grouped together for isolation, meaning they are blocked from directly reaching each other. An admin edits this list to add or remove ports from an isolation group, typically to keep guest or customer ports from seeing one another's traffic while still allowing access to a shared uplink. For example, setting the PortList to include ports 5 and 6 would isolate those two specific ports from each other under that entry.