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Because Blocked means blocked to user frames. From wikipedia: A port that would cause a switching loop if it were active. To prevent the use of looped paths, no user data is sent or received over a blocking port. BPDU data is still received in blocking state. A blocked port may go into forwarding mode if the other links in use fail and the spanning tree ...


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I just recently bought a second-hand GS-1548 which runs the same firmware as the GS-1524 and exhibits the same issue. In short, the web-based management UI does not allow removing ports from VLAN 1 (the fixed management VLAN). All the ports are always part of VLAN 1, either in tagged or untagged mode. You can freely remove ports from other VLANs but the “not ...


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