[Paper] B4: Experience with a Globally-Deployed Software Defined
mysidia at gmail.com
Sat Aug 17 23:02:44 UTC 2013
On Sat, Aug 17, 2013 at 2:32 PM, Avi Freedman <freedman at freedman.net> wrote:
> No, people never use *flow controllers* for anything.
> People have been doing SDN since before Google was around.
> OK, so it was horrible expect scripts but it worked.
Automatic reconfiguration of routers is not what a software-defined network
It is one of the things (but not all of the things) that SDN provides.
A software defined network is one where the forwarding behavior can be
in software running outside of the devices that perform the forwarding.
You can write expect scripts all day; but you cannot turn your basic switch
into a Load balancer or stateful firewall with one.
or decide in real time exactly which destination Ethernet ports a packet
coming in a certain port is going to touch, without having structured
VLANs and static MAC tables on the switches ahead of time.
Changing device configurations with expect scripts is a limited tiny subset
of what SDN is.
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