Recently, the company will replace the current dedicated line with sd-wan. What reliable sd-wan vendors can you recommend?

At present, there are too many manufacturers of sdwan, so it is ok to search casually on the Internet, such as foreign brands: Cisco, velocloud, Citrix, etc. And domestic brands: Huawei, Xinhua San, Dadiyun, etc. However, because there is no official definition of this product, the products that basically conform to the concept are called sdwan, so the result is that the products are very different, similar to traditional router and firewall manufacturers. It is unwise to go directly to the manufacturer, because you may have found a manufacturer's product and communicated for a long time, and POC has done it. As a result, you find that you can't meet your needs, and you have to change to another one to get it back. It's best to find a vendor that provides landing solutions and operation and maintenance services for sdwan, such as Optical Union Communication. They should focus on promoting Huawei products now, but they also set products according to user needs and provide landing and operation and maintenance services. Go directly to such manufacturers, throw the demand to them, and they will order products and make plans.