Datapath ID is not set correctly at LincSwitch when used with mininet API

[jalilm]

Each Switch object have a field denoted by dpid (datapath_id) that should be sent at FeaturesResponse message by the switch throughout the handshake.

By default, the Switch class generates different dpid according to the switch name. However this dpid is not reflected at FeaturesResponse message sent by linc. What is more, all linc switches send the same dpid (most controllers have no other way to distinguish which switch have sent the OpenFlow messages)!

To verify this behavior, just examine a handshake with 2 switches via Wireshark.

A suggested fix is to take advantage of the "-s" argument to linc_config_gen (already used from some reason with 0) by changing line 944 at node.py from:
configArgs = self.formConfigGenLogicalSwitchIdArg(0)
to:
configArgs = self.formConfigGenLogicalSwitchIdArg(self.dpid) \

[jalilm]

or even better:
int_dpid = int(self.dpid, 16)
configArgs = self.formConfigGenLogicalSwitchIdArg(int_dpid) \

to allow more than '0xa' switches, since otherwise you encounter the following error:
escript: exception error: bad argument
in function list_to_integer/1
called as list_to_integer("000000000000000a")

[dcc6fvo]

This is a good point @jalilm ...

It's impossible to work with Floodlight Controller for example... Since in Floodlight it needs a differente DPID for each switch.

Thank you very much for your suggestion

[dcc6fvo]

Do you have the modified mininet linc script @jalilm ?

[jalilm]

@dcc6fvo,

Sorry, I do not have the modified files anymore. It should be a simple fix as I suggested, it worked for me back then.

Anyhow, the project seems discontinued and inactive so you probably better look somewhere else.

[dcc6fvo]

Ok @jalilm .. my final goal is using OF-CONFIG's native support. But first, I need to get LINC working with the Floodlight Controller.

Thank you very much.