Hey mehwish0093! It looks like your post didn’t include the actual error message — could you share what the error says or maybe upload a screenshot that shows it clearly? Without knowing what the message is, it’s hard to tell whether it’s a sandbox s...

that’s a known quirk on the sg350/sg500 line — “protected-port” and “port security” don’t stop the switch from learning or forwarding macs between trunk ports that share vlans. those features isolate only same-switch access ports, not inter-switch tr...