I don't know from which day, the three words of cloud computing will slowly enter people's field of vision. At first, it was only proposed as a concept. I remember that in 2013, thousands of people from Cisco R & D Center attended a keynote speech on cloud computing. At that time, cloud computing seemed far away from everyone. But within a few years, the cloud computing hurricane blew from the western hemisphere to the eastern hemisphere. To this day, cloud computing is more or less associated with everyone. Many of the videos, pictures, and news refreshed by mobile apps are moved from cloud servers.
The benefits of cloud computing are not listed here, but with the rapid development of cloud computing, hardware firewalls and hardware intrusion detection systems that could protect the security of servers could not find their place. Servers already live in the cloud, and hardware firewalls can't go anywhere.
The server runs on virtual software. If you want to protect the server, you need a software firewall. The firewall manufacturer said, it's easy to handle. We develop a software firewall and it's just fine to install it on the server. Yes, this is a very logical idea.
Hardware routers face the same problem and cannot enter the cloud. In this way, router manufacturers will have fewer and fewer orders. What should I do? Develop software routers. Software routers can be installed on any server, including cloud servers.
The development of cloud computing has forced router and switch hardware manufacturers to step down and engage in software product development. However, software routers are distributed in large and small cloud business data centers, which is a big trouble to manage. Therefore, a new demand has emerged. How to centrally manage routers, switches, firewalls, and intrusion detection devices distributed in various corners of the world?
Every online router, switch, and firewall reports to this centralized management platform (controller) and informs its interface IP, physical connection, and its software capabilities. The controller collects the connection information of all managed devices, dedicated lines, and the Internet, and then pushes the encryption key of the WAN link to the router unit of the entire network, and simultaneously pushes the routing table of the entire network to the router unit, so that between The communication will no longer be forwarded by the controller. Instead, it will use a dedicated line or a secure VPN SD-WAN link between the routers. The entire network presents a full-meshed connection. What are the benefits of Full-Meshed? Little delay! One of the ultimate goals of the current Internet development is not to reduce communication delays?
SDN, SD-WAN, SD-LAN, look at this weird abbreviation. Where can I find a clear article? Articles seen on the Internet Most people write articles that are roughly the same. The best way to understand these concepts is to think about why these technologies were born? This is not the wish of any manufacturer, but a natural choice for the development of the Internet to this day. If this wave does not keep up, it will be photographed relentlessly on the beach.
In the group, I discussed SD-WAN with my classmates. The first question was raised, what is a WAN link? To my surprise, almost no one can answer this question accurately. I do n’t understand WAN links. How do I understand SD-WAN links?
The underlying foundation determines the superstructure
Many basic concepts have not been clarified, and it is not efficient to learn SD-WAN without thinking! Efficient words are the key to any study. Human life is limited, and human time and energy are limited. Of course, if you understand what a WAN link is, understanding SD-WAN is quite easy.
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