Hi all, 

I’m implementing SDN for multicast networks, and I want to use group table for 
the purpose, but I don’t know how to use it. Like Action Buckets : 
OFPBucket(weight, watch_port, watch_group, actions) 
In the document, it doesn’t talk much about how to use OFPBucket. 

What is the definition of each parameter in OFPBucket ?

If I use group table, do i also need to use flow table? 

How to add a group table into switch ? If I added, how to use it ?

Group table is kind of abstract to me, it would be helpful if I know how it 
looks like graphically.

I know some basic flow table manipulation, when it comes to group table, I’m 
lost and don’t know where to start.

Additionally, how do I dump out flow table or group table?

My environment is VM with mininet.
When I try to ….
$ dpctl dump-flows tcp:127.0.0.1:6634
dpctl: failed to send packet to switch: Connection refused

What’s reason of connection refused? Is there anyway to show table?
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