Hi @whistleblower As per below, if the port has RSTP disabled then it won’t participate in STP. It’s this config that’s stopping the loop Option Description Enabled RSTP must be enabled globally (see "Enable RSTP Globally") for any ports to be able to participate in Spanning Tree processes. When RSTP is enabled globally, RSTP will be enabled at the port level by default. A disabled port can be re-enabled by selecting Enabled. While RSTP is enabled on a switch port, that port is able to participate in Spanning Tree processes. It is recommended that RSTP be enabled on all ports. Disabled RSTP may be disabled at the port level. Disabling RSTP on a port removes the port from any STP processing including any STP guard configuration. Disabling RSTP on a port is not recommended unless the client device connected to the port is incompatible with STP. If RSTP is disabled globally, all ports will have RSTP disabled and cannot have it enabled.
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