On switch, I have 4 interfaces that are part of VLAN 100 and interfaces 1 and 2 have been put in Isolation but still they can reach interfaces 3 and 4.
Isolated ports are isolated against each other, but not against the non-isolated ports. If it would, you couldn't reach your upstream gateway. You need to implement other security measures like different VLANs terminated and filtered on the firewall or switch ACLs.
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