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Any configuration changes made locally on the switch won't be synchronized with Sophos Central. We recommend making changes from the Sophos Central control panel instead.

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https://docs.sophos.com/nsg/switch/help/en-us/index.html?contextId=user-guide-features-security-port-isolation

Port Isolation

The port isolation feature provides level two isolation between ports within the same broadcast domain. When turned on, Isolated ports can forward traffic to Not Isolated ports, but not to other Isolated ports. Not Isolated ports can send traffic to any port; whether Isolated or Not Isolated. The default setting is Not Isolated.

Click Apply to update the system settings.