How does an AR router determine a same MST region

The device fails to learn correct MAC entries because:
- The device does not receive packets because a link is Down, an interface is not added to a VLAN, an interface joins in loop protocol calculation and is blocked, or the MAC address drift detection is configured and an interface or a MAC address is blocked.
- There is a loop in the network, causing MAC entry flapping.
- The MAC address learning function is disabled, or corresponding sticky MAC address already exists.
- The number of MAC entries has reached the upper limit of the device.
- A static or blackhole route is configured.

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