[ovs-dev] In-band-hidden flows and out-of-band-doubts

[karthikeyan]

Hi,

I looked into the DESIGN.txt inside openVswitch and found that(line 119) 
"In Open vSwitch, in-band control is implemented as "hidden" flows (in 
that they are not visible through OpenFlow) and at a higher priority 
than wildcarded flows can be set up by through OpenFlow.*This is done so 
that
the OpenFlow controller cannot interfere with them and possibly break 
connectivity with its switches."

*1) Why are hidden flows used in "in-band mode" & how does an hidden 
flow(flow with high priority than normal openflow flow 
entryrange(greater than 65535) restricts the controller not to break 
connectivity with the switches?

2)How does two switches simulated through OVS(mininet) learn about their 
neighbor (switches)?. Does they use LACP for both "in-band" and 
"out-of-band" mode?

Best Regards,
Karthikeyan M
CBU-Datacom
TATA ELXSI.