+==================== For changing the topology on the fly
+make L/<id1>-<id2>
+ create a link between nodes with ids <id1> and <id2>
+make U/<id1>-<id2>
+ delete link between nodes with ids <id1> and <id2>
+==================== cleanup
+make clean
+ clean up whatever has been created on the slivers
+make distclean
+ clean up local cache, useful when restarting from a clean slice
+==================== configure (direct switches towards) OF controllers
+make showcontrollers
+ show how OF controllers are configured from conf.mk
+ use CONTROLLER_<nodeid> if set, or CONTROLLER as a default otherwise
+make controllers
+ configure the various switches so they use the configured controllers
+==================== devel
+make update
+ push a new version of sliver-ovs into the slivers
+ use SLIVER_OVS that should point to the local new version
+==================== manually/progressively deploy stuff (done in make all)