On Oct 12, 2011, at 11:36 AM, Ben Pfaff wrote:

> Could you at the same time add text about primary and service
> controllers and their different purposes?  You can crib it (probably
> abbreviated) from vswitch.xml.


How about the following?

       ovs-vswitchd can perform all configured bridging and switching locally,
       or  it can be configured to communicate with one or more external Open‐
       Flow controllers.  The switch is typically configured to connect  to  a
       primary  controller  that  takes  charge  of the bridge's flow table to
       implement a network policy.  Alternatively, the switch can  be  config‐
       ured  to  listen to connections from service controllers.  Service con‐
       trollers are typically used for  occasional  support  and  maintenance,
       e.g. with ovs-ofctl.

--Justin


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