Bengocloud blog
Http://bengo.blog.51cto.com/4504843/795619
This article is very cutting-edge.
After reading this, I think Cisco technology is much more convenient. The VM solution is a little complicated.
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Reply from the blogger:
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16:46:16
However, this is also the helplessness of software vendors. After all, there are tens of thousands of lines of code in physical box. First, it is difficult for outsiders to change the code, and second, hardware vendors do not give a chance to change the code. (Just now I checked the materials. Professor Nick of Stanford said in the PPT that the "OS" of the physical switch has millions of lines of code... nick is one of the initiators of openflow. If you are interested, You can Google it)
Therefore, openflow is so popular that it is free to go. It has been very busy recently. I am planning to summarize openflow and post a blog post. [7 th floor] gole_huang 15:24:28 good article. I feel that the article on Layer 2 is not as extensible as it is on Layer 4 or above. Changes in layer-2 encapsulation, including MTU and security, require more in-depth research. I personally think that L3 VPN should be the best choice for cross-region network access in terms of security and convenience.
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Reply from the blogger:
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16:34:06
Dear friend, I will learn more from you in the future ~
The parts brought about by MTU are indeed a problem. He talked about this problem during dinner with his friends these two days. Hardware identification, parsing, and encapsulation of new protocol packages is also a problem. Hardware Support is required. For example, hardware support is required when a physical router is connected to a virtual L2 network. After all, the VM in the virtual L2 network is encapsulated in the package that goes out of the physical machine PNIC...
Layer-4 or above is indeed feasible. It seems that there is a network virtualization product in Silicon Valley. The idea is to disguise TCP headers. It may be helpful for offloading, sharding, and so on before we can study them carefully, I don't know if it is based on some of your considerations ~
