Application scenarios of SDN switches in cloud computing networks

Regarding the application of SDN in cloud computing networks, there are currently two main genres, one is the "soft" party represented by VMware, and the other is the "hard" party represented by Cisco. The former mainly means that the core logic of the entire network virtualization solution is implemented on the hypervisor in the server. The physical network is only a pipeline; while the latter refers to the core logic of network virtualization implemented in the physical network (the main edge of the machine) The top switch, or TOR, is only placed on the server or other dedicated devices if the switch cannot be implemented. These two programs have their own merits,and each has its own fans.

It should be specially stated that these scenarios can be done with Cisco's ACI because, in essence, ACI's idea is to use hardware SDN to support network virtualization. If you master SDN switches knowledge well, you are highly possible pass CCIE Routing and Switching Lab exam. However, because many users do not want to use the Cisco ACI for various reasons (such as price is too expensive, vendor lock-in, localization trend, etc.), they need another solution (I am not saying that ACI is not good, on the contrary, purely from a technical point of view) I personally appreciate ACI).

Scenario 1: Using a hardware SDN switch to access a hardware firewall

Hardware firewalls are used in cloud computing networks, which is common. In particular, corporate private clouds hosted clouds, and even public clouds are also available. Many users have made it clear that I used my hardware firewall very well. You have to let me go to the cloud, I must use my hardware firewall. That problem came. In the traditional network, user data wants to go through the firewall. It is very simple. Connect the firewall to the network exit or configure an ACL to direct the flow. However, in a cloud computing network, it is possible that a firewall is only serving a certain number of users or a group of applications. Even this firewall is built by the user.

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