[pox-dev] buffer_id is None?

[Nan Zhu]

Hi, all

I'm developing some controller with POX,

When I test it with mininet (--switch ovsk), I found that I will receive
some packet_in which has a buffer_id with the value of None?

Anyone had this problem before? obviously it is caused by my controller, I
used other code to test, this type of packet never appear

What can be the reason of that?

Best,

Nan
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