As a seasoned network engineer with a wealth of experience in managing and troubleshooting network-based systems, I believe I would be the ideal candidate for your project. My proficiency with configuring, maintaining and optimizing network infrastructures, particularly on Cisco systems, extends to other OEMs such as Huawei. I've successfully handled various Radius server integrations including those requiring COA (Change of Authorization) requests like the one you're seeking with your Huawei AirEngine Controller.
Having worked extensively with different vendors in the telecommunications industry, I'm well-familiar with the abilities and limitations of devices such as yours. In terms of your project requirements, my skills include precisely what you need - handling authorized access and session termination. With my understanding of Radius Vendor Attributes, specifically 'HW-Remanent-Volume', your aim to cut off user sessions when either MB limits are reached or session times out can easily be met.
In summary, hiring me ensures you're bringing on-board a professional who not only understands the scope and complexity of your request but has hands-on experience working on projects that share similar features. Overall, my flexibility , technical skills and commitment to efficiency makes me the best choice for ensuring smooth operations on your Huawei AirEngine Controller. Let's get started creating a reliable network for your enterprise!