Use IP address strings rather than hex number.
Removed underscores for public Node methods. Minor cleanup & comments.
Fix remote controller param
Add TreeTopo to cmd line
Make cleanup a param of mn, not a separate script
Also switch from print to info statements, to enable a non-verboseclean. Instead of 'mnclean', now run 'mn -c'.
Slightly reduce cliinfo verbosity
Add flexible topology input parsing
Now you can pass a topology name followed by params. For example, tocreate a switch with 3 hosts:
sudo mn --topo single,3
Add new loglevel to display CLI output only
Also print warning if user chooses a loglevel that will hide CLI output.
Changed to be executable.
Tweaks to pass code check.
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