Diarmuid,
I may have misunderstood your question, but the openflow does not allow the
output port to be the same as input port.
If you must do that then you have to use the reserved port OFPP_IN_PORT,
which forces the output port to be the same as the input.
Regards,
Maen
On Mon, Mar 4, 2019 at 5:38 AM Diarmuid O Briain <diarm...@obriain.com>
wrote:
> Hi,
>
> I added the following lines to the event handler
>
> if (eth.dst == eth.src):
> print(f'EQUAL MACs: SRC: {eth.src} == DST: {eth.dst}')
> return
>
> EQUAL MACs: SRC: 00:1e:be:17:eb:9a == DST: 00:1e:be:17:eb:9a
> EQUAL MACs: SRC: c4:71:fe:10:fe:00 == DST: c4:71:fe:10:fe:00
> EQUAL MACs: SRC: 00:1e:be:17:eb:9a == DST: 00:1e:be:17:eb:9a
>
> I see lots of equal MACs but now I get no new flows added:
>
> ~$ curl -X GET http://198.8.8.235:8080/stats/flow/176199429686713; echo
> {"176199429686713": [{"priority": 0, "cookie": 0, "idle_timeout": 0,
> "hard_timeout": 0, "byte_count": 51783, "duration_sec": 319,
> "duration_nsec": 180000000, "packet_count": 648, "length": 80, "flags": 0,
> "actions": ["OUTPUT:CONTROLLER"], "match": {}, "table_id": 0}]}
>
> regards,
>
> Diarmuid
> --
>
> *Irish by birth, located in Uganda but Munster by the grace of God.*
>
>
>
>
> On Mon, 4 Mar 2019 at 12:16, Diarmuid O Briain <diarm...@obriain.com>
> wrote:
>
>> Hi,
>>
>> Referring to a mail I chain I started on this email group a couple of
>> weeks ago. The support engineer in Netgear asked me for a simple
>> description and how it could be replicated.
>>
>> For reference and in case anyone here is interested I attach this
>> description and a howto replicate.
>>
>> Essentially the Netgear switch sends a packet for each port that has SRC
>> MAC == DST MAC:
>>
>> - IN PORT: 1
>> - SRC_MAC: *00:1e:be:17:eb:9a*
>> - DST_MAC: *00:1e:be:17:eb:9a*
>>
>> This causes the simple_switch_13.py to ADD FLOW with the in port and the
>> out port the same.
>>
>> - Priority: 1
>> - OFPMatch(oxm_fields={*'in_port': 1*, 'eth_dst':'00:1e:be:17:eb:9a'})
>> - [OFPActionOutput(len=16,max_len=65509,*port=1*,type=0)]
>> - Buffer ID: 267
>>
>> Would it be safe to add a loop to drop add_flow() calls where the Match
>> port and the Action port are the same as well as the src and dst MAC
>> addresses? Is there any condition where that would be normal behaviour?
>>
>> regards,
>>
>> Diarmuid
>> --
>>
>> *Irish by birth, located in Uganda but Munster by the grace of God.*
>>
>>
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