Refer to the exhibits.

Topology view -


Core-1 CLI output -


Core-2 CLI output -

An administrator has deployed two FortiSwitch devices, Core-1 and Core-2, as multichassis link aggregation group (MCLAG) peers. These switches are connected to FortiGate for FortiLink and to an access switch (Access-1) using an inter-switch link (ISL). After configuration, the administrator notices that both Core-1 and Core-2 are claiming to be the root bridge in the Multiple Spanning Tree Protocol (MSTP) topology.
What explains this behavior?