Changes between Version 62 and Version 63 of GENIExperimenter/Tutorials/OpenFlowOVS/Execute

Timestamp:

07/18/14 15:03:25 (10 years ago)

Author:

Vic Thomas

Comment:

--

GENIExperimenter/Tutorials/OpenFlowOVS/Execute

@@ -145 +145 @@
   4. Go back to your OVS host and take a look at the print outs. You should see that your controller installed flows based on the mac addresses of your packets. 
 
-  5. Kill your POX controller by pressing `Ctrl-C`:
+  5. To see the flow table entries on your OVS switch:
+  {{{
+  sudo ovs-ofctl dump-flows br0
+  }}}
+  You should see at least two table entries: One for ICMP Echo (icmp_code=8) messages from host1 to host2 and one for ICMP Echo Reply (icmp_code=0) messages from host2 to host1.  You may also see flow entries for arp packets.
+
+  6. To see messages go between your switch and your controller (listening on port 6633 of your localhost), run tcpdump on your loopback interface:
+  {{{
+  sudo tcpdump -i l0
+  }}}
+  You will see (1) periodic keepalive messages  being exchanged by the switch and the controller, (2) "packet in" messages from the switch to the controller when a flow table entry expires and an ICMP Echo message in, and (3) "packet out" messages from the controller to the switch that install new flow entries.
+
+  7. Kill your POX controller by pressing `Ctrl-C`:
   {{{
   DEBUG:forwarding.l2_learning:installing flow for 02:c7:e8:a7:40:65.1 -> 02:f1:ae:bb:e3:a8.2
@@ -154 +166 @@
   ovs:/local/pox% 
   }}}
+
+  7. Check the flow table entries on your switch:
+   {{{
+  sudo ovs-ofctl dump-flows br0
+  }}}
+  Since you set our switch to "secure" mode, i.e. don't forward packets if the controller fails, you will not see flow table entries.  If you see flow table entries, try again after 10 seconds to give the entries time to expire.
 
   6. Notice what will happen to your ping on host1.