What type of switch are you using? Is it possible that the switch is disconnecting from the controller and then when it reconnects the flow entries are cleared. (I think NOX may send a flow_mod when switches connect to clear out existing flow entires).
On Tue, Apr 17, 2012 at 4:32 PM, Rohan Gandhi <[email protected]>wrote: > Thanks Syed. It was a snippet that I showed. There are flows with > n_packets > 0. > > cookie=0, duration_sec=382s, duration_nsec=535000000s, table_id=0, > priority=32768, n_packets=757, n_bytes=58265, > idle_timeout=0,hard_timeout=0,tcp,nw_dst=10.0.0.2,tp_dst=34092,actions=mod_dl_dst:00:00:00:00:00:02,mod_nw_src:10.0.0.253,mod_tp_src:6002,output:2 > cookie=0, duration_sec=410s, duration_nsec=118000000s, table_id=0, > priority=32768, n_packets=0, n_bytes=0, > idle_timeout=0,hard_timeout=0,tcp,nw_dst=10.0.0.253,tp_dst=6008,actions=CONTROLLER:65535,mod_dl_dst:00:00:00:00:00:02,mod_nw_dst:10.0.0.2,mod_tp_dst:5000,output:2 > cookie=0, duration_sec=410s, duration_nsec=120000000s, table_id=0, > priority=32768, n_packets=382, n_bytes=33158, > idle_timeout=0,hard_timeout=0,tcp,nw_dst=10.0.0.253,tp_dst=6002,actions=CONTROLLER:65535,mod_dl_dst:00:00:00:00:00:04,mod_nw_dst:10.0.0.4,mod_tp_dst:5000,output:4 > > I check the flow-tables every 1 sec. Flow-table entries dont grow with > time. > > Thanks, > Rohan > > On Tue, Apr 17, 2012 at 3:39 PM, Syed Muhammad Mohsin Kazmi < > [email protected]> wrote: > >> If you see at flow table,there is no packet hits the flow at field >> n_packets=0. In my opinion, every packet sent to controller where your >> app. write down the flow for it to the swtich each time, so that is >> why your flow-table entries are flushed after some time. You should >> check your code again, i think so, there is a problem. >> >> Regards, >> Syed M. Mohsin Kazmi >> >> >> On Wed, Apr 18, 2012 at 12:13 AM, Rohan Gandhi <[email protected]> >> wrote: >> > Hello All, >> > >> > I am sorry to bother you again. I got most of my questions sorted out. >> But >> > my flow-table entries are getting flushed after some time. All the flows >> > that I add have idle and hard timeout set to permanent. The switch has 6 >> > ports with 3 TCP connections (1 TCP connection for 2 hosts with no host >> > having more than 1 connection). I continuously send the packets over >> these 3 >> > flows. Any idea on why this is happening? These does not happen if I >> limit >> > the traffic (by adding a delay at the hosts). I could not quantify how >> much >> > traffic I reduced though. >> > >> > The following is the snippet of the flow-table. >> > >> > Thanks! >> > Rohan >> > >> > openflow@openflowtutorial:~$ dpctl dump-flows tcp:127.0.0.1:6634 >> > stats_reply (xid=0x2e34f6b7): flags=none type=1(flow) >> > cookie=0, duration_sec=12s, duration_nsec=558000000s, table_id=0, >> > priority=32768, n_packets=0, n_bytes=0, >> > >> idle_timeout=0,hard_timeout=0,tcp,nw_dst=10.0.0.253,tp_dst=6008,actions=CONTROLLER:65535,mod_dl_dst:00:00:00:00:00:02,mod_nw_dst:10.0.0.2,mod_tp_dst:5000,output:2 >> > ... >> > .. >> > >> > >> > >> > openflow@openflowtutorial:~$ dpctl dump-flows tcp:127.0.0.1:6634 >> > stats_reply (xid=0xc01ad743): flags=none type=1(flow) >> > >> > > -- Aaron O. Rosen Masters Student - Network Communication 306B Fluor Daniel
