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						What is the meaning of the variable followed by the id parameter in the ovs command
						
 for example:   ovs-vsctl-id=@m get mirror mymirror-- remove bridge br0 mirrors @ m  and   ovs-vsctl-id=@ft create Flow_Table flow_limit=100 overflow_policy=refuse-- set Bridge br0 flow_tables=0=@ft   what are the variables in the -id=@  commands? 
 Than... 
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						There is no ryu-manager after installing the Ryu controller
						
.
 app
 base
 cfg.py
 cfg.pyc
 cmd
 contrib
 controller
 exception.py
 exception.pyc
 flags.py
 flags.pyc
 hooks.py
 hooks.pyc
 __init__.py
 __init__.pyc
 lib
 log.py
 log.pyc
 ofproto
 services
 tests
 topology
 utils.py
 utils.pyc
The files and subdir... 
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