I notice that the routing module is behaving differently with NOX0.6
causing each switch en route to generate independent packet_ins, while
NOX0.4 generates only 1 packet_in. This behavior incurs higher flow
setup time.
I have a topology of client <-> hpsw3 <-> hpsw1 <-> server . I
performed a wget operation from client to server. Following is the
control traffic sent/received by the controller (Timestamp was what my
tcpdump captured):
1266984715.446715 PACKET_IN hpsw3
1266984715.446895 FLOW_MOD hpsw3
1266984715.446936 PACKET_OUT hpsw3
1266984715.452756 PACKET_IN hpsw1
1266984715.452913 FLOW_MOD hpsw1
1266984715.452937 PACKET_OUT hpsw1
Ideally, I would've expected to see the controller to push out the
second FLOW_MOD soon enough (and not 6 ms after the PACKET_OUT).
When I use NOX0.4, the action sequence is:
1266987591.116579 PACKET_IN hpsw3
1266987591.116725 FLOW_MOD hpsw3
1266987591.116755 FLOW_MOD hpsw1
1266987591.116787 PACKET_OUT hpsw3
Any idea if there is a code change?
Thanks
Srini.
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