Unfortunately, the description in the OpenFlow spec doesn't match the
reference implementation. The OpenFlow v0.8.9 release notes do match
the implementation, though:
http://openflowswitch.org/wk/index.php/OpenFlow_0.8.9_release_notes#Modify_Actions_in_Existing_Flow_Entries
The difference is that the spec states that if an OFPFC_MODIFY action
doesn't match any entries, then it must be added. The implementation
only modifies entries that it can find, it will never add them.
According to the spec, KK's code should have worked regardless of
which method he used.
My personal opinion is that the reference implementation's behavior
makes more sense, but this is a discussion for one of the OpenFlow dev
lists.
--Justin
On Feb 15, 2009, at 10:54 PM, Brandon Heller wrote:
Hi KK,
Please see section 4.6 of the spec for the differences. Available at:
http://www.openflowswitch.org/documents/openflow-spec-v0.8.9.pdf
In short, modify keeps the associated flow counters, while add
overwrites them.
-b
On Sun, Feb 15, 2009 at 10:23 PM, kk yap <[email protected]> wrote:
Hi,
I managed to do the flow mod by changing the command the ADD instead
of MODIFY. Can someone explain what is the difference?
Thanks.
Regards
KK
2009/2/14 Justin Pettit <[email protected]>:
> Can you send us a either a pcap file or a printout of the bytes on
the wire?
>
> --Justin
>
>
> On Feb 14, 2009, at 5:31 AM, kk yap wrote:
>
>> Hi,
>>
>> I have sent a ofp_flow_mod message, which I verified to be
correctly
>> formed using a wireshark to a software reference switch.
However, I
>> do not see the flow entry when I do a dpctl dump-flows. The
entry is
>> made to be Permanent (both hard and idle timeout). Can anyone
think
>> of a reason why this is so?
>>
>> Thanks in advance.
>>
>> Regards
>> KK
>>
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>
>
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