On 06/30/2011 03:38 AM, Wei-Chih Chen wrote:
Dear David and Ben,
Sorry, I can not figure it out. @@
Could you give more details? Thank you.
packets-> OpenFlow switch transfers packets to OpenFlow messages->
OpenFlow messages-> controller receives, handles(drop, modify...)->
modified OpenFlow messages-> OpenFlow switch receives and routes these
messages
Is it correct?
Here is a simplified view:
Packets come into an OpenFlow switch, if they match a flow in the flow
tables then the corresponding actions for that flow are applied to the
packet (ie send out a port, rewrite some header, etc). If there is no
match, typically the packet is encapsulated in an OpenFlow PacketIn
message and sent to the controller. The controller then decides what to
do with that packet (and others coming from the same flow), and sends a
FlowMod message back to the switch which modifies the flow tables on the
switch with the controller's decision.
Are OpenFlow messages here the same as network packets?
OpenFlow messages are contained in network packets, and may contain
network packets :).
-D
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