cmVBridgeNOverflow is a read-only integer counting how many MAC addresses the bridge failed to learn because its MAC table was already full. An administrator monitors this to detect when a bridge's capacity is being exceeded, which would prevent legitimate traffic from being forwarded correctly. For example, a nonzero and growing cmVBridgeNOverflow on an interface would prompt the operator to investigate whether an unusually large number of devices are attached behind that connection, exceeding the bridge's table size.