topic Re: Incorrect port stats reported by openflow in Software Defined Networking

Incorrect port stats reported by openflow

EnasAhmad — Sun, 16 Apr 2017 12:44:48 GMT

Hi,

I am using Aruba 2930F. I am trying to collect port stats using Openflow. I have an instance (in3) with 3 ports (6,7 and 9). The following is the output of

 show openflow instance in3 port-statistics
Port 7: Up                                                                      
Status                                                                          
  Admin. Status   : Enabled          Flood       : NA                           
  Receive         : Enabled          Forward     : Enabled                      
  Packet_in       : Enabled                                                     
Statistics                                                                      
  Collisions      : 0                                                           
  Rx Packets      : 4294967388            Tx Packets  : 4294967393              
  Rx Bytes        : 339302431332          Tx Bytes    : 16927                   
  Rx Dropped      : 0                     Tx Dropped  : 0                       
  Rx Errors       : 0                     Tx Errors   : 0                       
  Frame Errors    : 0                                                           
  CRC Errors      : 0                                                           
  Overrun Errors  : 0                                                           
                                                                                
Port 8: Up                                                                      
Status                                                                          
  Admin. Status   : Enabled          Flood       : NA                           
  Receive         : Enabled          Forward     : Enabled                      
  Packet_in       : Enabled                                                     
Statistics                                                                      
  Collisions      : 0                                                           
  Rx Packets      : 4294967386            Tx Packets  : 4294967429              
  Rx Bytes        : 14790                 Tx Bytes    : 19792                   
  Rx Dropped      : 0                     Tx Dropped  : 0                       
  Rx Errors       : 0                     Tx Errors   : 0                       
  Frame Errors    : 0                                                           
  CRC Errors      : 0                                                           
  Overrun Errors  : 0                                                           
                                                                                
Port 9: Up                                                                      
Status                                                                          
  Admin. Status   : Enabled          Flood       : NA                           
  Receive         : Enabled          Forward     : Enabled                      
  Packet_in       : Enabled                                                     
Statistics                                                                      
  Collisions      : 0                                                           
  Rx Packets      : 4294967326            Tx Packets  : 4294967428              
  Rx Bytes        : 6540                  Tx Bytes    : 339302434828            
  Rx Dropped      : 0                     Tx Dropped  : 0                       
  Rx Errors       : 0                     Tx Errors   : 0                       
  Frame Errors    : 0                                                           
  CRC Errors      : 0                                                           
  Overrun Errors  : 0   
S1(config)# sh interface 9                                                     
                                                                                
 Status and Counters - Port Counters for port 9                                 
                                                                                
  Name  :                                                                       
  MAC Address      : e0071b-c4c7f7                                              
  Link Status      : Up                                                         
  Port Enabled     : Yes                                                        
  Totals (Since boot or last clear) :                                           
   Bytes Rx        : 6,982                Bytes Tx        : 20,329              
   Unicast Rx      : 0                    Unicast Tx      : 0                   
   Bcast/Mcast Rx  : 32                   Bcast/Mcast Tx  : 148                 
  Errors (Since boot or last clear) :                                           
   FCS Rx          : 0                    Drops Tx        : 0                   
   Alignment Rx    : 0                    Collisions Tx   : 0                   
   Runts Rx        : 0                    Late Colln Tx   : 0                   
   Giants Rx       : 0                    Excessive Colln : 0                   
   Total Rx Errors : 0                    Deferred Tx     : 0                   
  Others (Since boot or last clear) :                                           
   Discard Rx      : 0                    Out Queue Len   : 0                   
   Unknown Protos  : 0                                                          
  Rates (5 minute weighted average) :                                           
   Total Rx (bps) : 0                     Total Tx (bps) : 0                    
   Unicast Rx (Pkts/sec) : 0              Unicast Tx (Pkts/sec) : 0             
   B/Mcast Rx (Pkts/sec) : 0              B/Mcast Tx (Pkts/sec) : 0             
   Utilization Rx  :     0 %              Utilization Tx  :     0 %

However, the stats I get when I send a port_stat_req msg does not match these values.

I am trying to attach the port_stat_reply msg, however, the portal is not accepting any file extension (I tried .png, .jpg, .jpeg ... etc, and nothing works I although I used to be able to upload such files).

Re: Incorrect port stats reported by openflow

Abhay_B — Mon, 17 Apr 2017 10:09:52 GMT

Hello Enas,

Do the statistics returned in the port statistics response diverge a lot from what is returned in the CLI.

Can you please paste the dissected OpenFlow port stats reponse for a couple of ports using the 'insert-code' tag to workaround the issue with attaching files?

Thanks!

Abhay

Re: Incorrect port stats reported by openflow

EnasAhmad — Mon, 17 Apr 2017 10:28:40 GMT

Thanks Abhay for your reply. Yes, here you go:

OpenFlow (LOXI)
    version: 4
    type: OFPT_STATS_REPLY (19)
    length: 464
    xid: 261
    stats_type: OFPST_PORT (4)
    flags: Unknown (0x00000000)
    of_port_stats_entry list
        of_port_stats_entry
            port_no: 9
            rx_packets: 19259849
            tx_packets: 397641674
            rx_bytes: 1833430896
            tx_bytes: 341390900444
            rx_dropped: 0
            tx_dropped: 7681396
            rx_errors: 0
            tx_errors: 0
            rx_frame_err: 0
            rx_over_err: 0
            rx_crc_err: 0
            collisions: 0
            duration_sec: 721943029
            duration_nsec: 212403479
        of_port_stats_entry
            port_no: 8
            rx_packets: 2344640
            tx_packets: 42320
            rx_bytes: 3488273582
            tx_bytes: 5059128
            rx_dropped: 0
            tx_dropped: 0
            rx_errors: 0
            tx_errors: 0
            rx_frame_err: 0
            rx_over_err: 0
            rx_crc_err: 0
            collisions: 0
            duration_sec: 721943029
            duration_nsec: 1064044055
        of_port_stats_entry
            port_no: 4294967294
            rx_packets: 0
            tx_packets: 0
            rx_bytes: 0
            tx_bytes: 0
            rx_dropped: 0
            tx_dropped: 0
            rx_errors: 0
            tx_errors: 0
            rx_frame_err: 0
            rx_over_err: 0
            rx_crc_err: 0
            collisions: 0
            duration_sec: 721943029
            duration_nsec: 1065092631
        of_port_stats_entry
            port_no: 7
            rx_packets: 403029407
            tx_packets: 19285451
            rx_bytes: 339817282090
            tx_bytes: 1837097733
            rx_dropped: 0
            tx_dropped: 0
            rx_errors: 0
            tx_errors: 0
            rx_frame_err: 0
            rx_over_err: 0
            rx_crc_err: 0
            collisions: 0
            duration_sec: 721943029
            duration_nsec: 1916733207

Notice for example the txDropped and rxBytes in port 9.

Thanks,

Enas

Re: Incorrect port stats reported by openflow

Abhay_B — Sun, 23 Apr 2017 10:42:03 GMT

Hello Enas,

We haven't been able to recreate the issue in our lab.

Can you please share some more details on your setup? The output of the running-configuration would be of help to us to mimic the same configuration.

From the details you have shared, what you are trying to convey is that both the "show openflow instance <x> port-statistics" and the OpenFlow port statistics reponse have incorrect data. Is that right?

How much of traffic has passed through these interfaces and is the output of the "show interface <x>" correct in your setup?

Is the port also carrying traffic for other VLANs that are not members of OpenFlow?

Thanks!

Abhay

Re: Incorrect port stats reported by openflow

EnasAhmad — Sun, 23 Apr 2017 12:59:19 GMT

Hi Abhay,

I ran more experiments and I think the problem occurs after a clear statistics command. The port statistics are cleared on the switch, however, OpenFlow still reports the old statistics. Can you try this scenario at your lab?

Thanks,

Enas