[pox-dev] Importing components in POX at run time

[Murphy McCauley]

The "WARNING:forwarding.l2_multi:Can't get from 96:bb:06:61:71:8d to ae:b8:16:4d:a3:6b" message indicates that your new version of _get_path returned None rather than a path and has nothing to do with clearing the flow tables.  You need to fix your _get_path so that it returns a path in the proper format.  (In fact, it's probably easier to replace _get_raw_path.)

Although I don't think it's related, what I was talking about to clear flows without waiting for them to time out is something like:
for dpid,con in core.openflow.connections.iteritems():
  con.send(of.ofp_flow_mod(command=of.OFPFC_DELETE))

-- Murphy

On May 30, 2013, at 6:34 AM, hansinie vitharana wrote:

> I saw the post relavant to "Changing the POX component without restarting POX	controller" and it was very useful to me also..
> 
> I am also trying to change the functions on run time and I followed the solution that was given by Murphy 
> 
> ./pox.py forwarding.l2_multi openflow.discovery py
> 
> This will load up l2_multi and then give a Python interpreter.  You can swap the functions from the interpreter...
> 
> POX> import pox.forwarding.l2_multi as l2m
> POX> shortest = l2m._get_path
> POX> import ext.longestpath
> POX> l2m._get_path = ext.longestpath._get_path
> 
> You can switch back to shortest again by doing:
> POX> l2m._get_path = shortest
> 
> After giving above commands, and after waiting for some to flow tables to be get clear, when I try to ping between hosts, it fails..
> In the POX terminal it gives the message as 
> 
> "WARNING:forwarding.l2_multi:Can't get from 96:bb:06:61:71:8d to ae:b8:16:4d:a3:6b"
> 
> The Solution has mentioned about "send a flow_mod to each connection to delete them (iterate over core.openflow.connections)", but I am not sure about how to do this..
> 
> 
> Please be kind enough to show me where I am going wrong and how to correct this error..

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