negative (-) port numbers and ether type in flow statistics from REST API

Franziska Corradi

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Dec 6, 2015, 7:07:32 AM12/6/15

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Hello all,

While working with ONOS REST API, i found some strange values in the REST reply for flow Statistics.

If I look at Wireshark I see for instance an LLDP Packet in the flow-stats-reply with
ethertype : 35020 (0x88cc)
port out : 4294967293
[see picture from Wireshark below]

the information that I think is supposed to be related to that, from the REST API (http://10.1.0.16:8181/onos/v1/flows) gives
ether type: -30516
port out: -3
[see JSON output from REST Request below]

ARP packets show similar values, the ARP Ethertype shows up correct in the REST Response, but also with some negative port Value.

Does anyone knows what this "high" port number stands for ? is this the general port to communicate with the controller or like a Broadcast port or something?

Why are these values shown differently in the in the REST reply ?

Thanks for clarification.
Regards
Fränzi

{
"flows": [
    {
      "id": "10414575354596821",
      "appId": "org.onosproject.core",
      "groupId": 0,
      "priority": 40000,
      "timeout": 0,
      "isPermanent": true,
      "deviceId": "of:0000000000000001",
      "state": "ADDED",
      "life": 241,
      "packets": 0,
      "bytes": 0,
      "lastSeen": 1449400662116,
      "treatment": {
        "instructions": [
          {
            "type": "OUTPUT",
            "port": -3
          }
        ],
        "deferred": []
      },
      "selector": {
        "criteria": [
          {
            "type": "ETH_TYPE",
            "ethType": -30516
          }
        ]
      }
    },
    {

Auto Generated Inline Image 1

Marc De Leenheer

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Dec 6, 2015, 11:20:13 AM12/6/15

to Franziska Corradi, ONOS Discuss

Top values in the port number space represent logical values (flood, local etc.). The bug you're hitting looks like anp unsigned to signed conversion error.

Can you file an issue on our jira for this?

marc

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Andrea Campanella

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Dec 6, 2015, 2:40:32 PM12/6/15

to Marc De Leenheer, Franziska Corradi, ONOS Discuss

Hi,

the ethType output by the REST api has been changed in EMU to 0x0000 format to be more human readable (see https://en.wikipedia.org/wiki/EtherType#Notable_values).

Regarding the output port please do as Marc requested and file a issue on Jira so we can fix as soon as possible.

Have a nice sunday.

Andrea Campanella

and...@onlab.us

On Dec 6, 2015, at 8:20 AM, Marc De Leenheer <ma...@onlab.us> wrote:

Top values in the port number space represent logical values (flood, local etc.). The bug you're hitting looks like anp unsigned to signed conversion error.
Can you file an issue on our jira for this?
marc

On Dec 6, 2015 4:07 AM, "Franziska Corradi" <franzisk...@gmail.com> wrote:

Hello all,

While working with ONOS REST API, i found some strange values in the REST reply for flow Statistics.

If I look at Wireshark I see for instance an LLDP Packet in the flow-stats-reply with
ethertype : 35020 (0x88cc)
port out : 4294967293
[see picture from Wireshark below]

the information that I think is supposed to be related to that, from the REST API (http://10.1.0.16:8181/onos/v1/flows) gives
ether type: -30516
port out: -3
[see JSON output from REST Request below]

ARP packets show similar values, the ARP Ethertype shows up correct in the REST Response, but also with some negative port Value.

Does anyone knows what this "high" port number stands for ? is this the general port to communicate with the controller or like a Broadcast port or something?

Why are these values shown differently in the in the REST reply ?

Thanks for clarification.
Regards
Fränzi

<Auto.png>

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Franziska Corradi

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Dec 8, 2015, 8:48:37 AM12/8/15

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Hello,

thanks for the Input, I did as told and opend a bug ONOS-3562 for this problem. If I need to add more inforamtion please let me know. I'm not a Programmer and dont know
if the information is sufficent. I'm happy to help as good as I can.

Is there any Documentation about these "high" Port Values? or where could I find more Information about what Port Number belongs to which port type ?

Thanks
Fränzi

Charles Chan

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Dec 8, 2015, 12:02:05 PM12/8/15

to Franziska Corradi, ONOS Discuss

These port numbers are defined in OpenFlow specification. You can search for ofp_port_no

Charles

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Jonathan Hart

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Dec 8, 2015, 1:47:34 PM12/8/15

to Charles Chan, Franziska Corradi, ONOS Discuss

Yes you can look in the OpenFlow spec, and also these values are defined in the ONOS code in the org.onosproject.net.PortNumber class.

-3 is the value for the CONTROLLER logical port in OpenFlow, which means send the packet to the controller.

Thanks,

Jono

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Franziska Corradi

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Dec 12, 2015, 6:39:41 AM12/12/15

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Thank you all very much. This helps me a lot.

Regards

Fränzi

On Sunday, December 6, 2015 at 1:07:32 PM UTC+1, Franziska Corradi wrote:

Andrea Campanella

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Dec 13, 2015, 1:45:29 PM12/13/15

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Perfect. Let us know anything else we can do.

Andrea Campanella

and...@onlab.us

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