I am using RYU to do SDN for routing traffic to links with better bandwidth
in a multipath topology.
I have a mininet topology such that there are 4 switches and 4 hosts (h1,
h2, h3, h4, s1, s2, s3, s4).
The links are setup such that we have
link(s1, s2), link(s2, s3), link(s3, s4), link(s4, s1), link(h1, s1),
link(h2, s2), link(h3, s3), link(h4, s4)
suppose that the link(s1, s2) has a bandwidth of 10 mbps where as link(s4,
s1) has a capacity of 20 mbps. I want to setup the controller such that
routes traffic that goes from h1 to h4 using the faster path more
frequently.
I am very new to openflow and RYU so I am having trouble determining the
right event to use that will let me modify the flow in the controller so
that I can route traffic based on bandwidth. I notice that once flows are
established, the controller does not do the computation in the
_packet_in_handler function of ofp_event.EventOFPPacketIn, is there a way
to access the controller before it routes traffic based on the flow table
entries?
Also, is it possible to get the bandwidth of the links in the RYU
controller?
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