The Content Delivery Networks (CDNs) in a multi-CDN delivery have variable requirements and capabilities. Multi-CDN communication over content steering server aims to address this problem in real-time by allowing a CDN to manage its traffic load based on internal metrics via communication with other CDNs over the content steering server while aligning with the standard. The communication process involves operation requests, acceptances, rejections, or negotiations for client offloading/onloading. The paper implements this approach and utilizes power efficiency as the internal CDN metric. We present the implementation details and the possible lifecycles of a communication process. Future work includes the comprehensive evaluation and introduction of learning-based approaches by predicting future traffic load and initiating communication process before the internal metrics catastrophe.