Hello,
the OVS in my mininet environment is losing packets of a flow which
sends packets to the SDN controller:
I have a linear topology consisting of: Host1 <-> OVS1 <-> OVS2 <->
Host2. Both switches are connected to an SDN controller outside of the
virtual machine where mininet is running. Both OVS have rules installed
for two flows:
1) Packets from Host1 destined to Host2 are forwarding through the
corresponding port and
2) another flow for probe-packets from the Controller to OVS1, where
they are forwarded to the port where OVS2 is connected. OVS2 forwards
these packets based on the dummy destination IP address again to the
controller (/ip,nw_dst=10.0.0.99 actions=CONTROLLER/).
Flow 1 forwards are packets perfectly from Host1 to Host2 at high rates.
However, probing packets sent from the Controller to OVS1 are forwarded
to OVS2, through investigations using Wireshark i found that all of them
are received on the port at OVS2 which is connected to OVS1. However,
only a fraction of them are forwarded through the port to the controller
(as Wireshark showed). This holds true for very slow packet rates of
10pps, so that i don't think the userspace-handling is responsible for
this. Thus, they never leave the switch. The received packets are NOT
included in the OpenFlow counter as well.
Has anyone an idea why this is happening or knows how i can debug this
situation?
Thanks in advance!
/ovs-appctl ofproto/trace s2 ip,nw_dst=10.0.0.99
Bridge: s2
Flow:
ip,in_port=ANY,vlan_tci=0x0000,dl_src=00:00:00:00:00:00,dl_dst=00:00:00:00:00:00,nw_src=0.0.0.0,nw_dst=10.0.0.99,nw_proto=0,nw_tos=0,nw_ecn=0,nw_ttl=0
Rule: table=0 cookie=0x1447 ip,nw_dst=10.0.0.99
OpenFlow actions=CONTROLLER:65535
Final flow:
ip,in_port=ANY,vlan_tci=0x0000,dl_src=00:00:00:00:00:00,dl_dst=00:00:00:00:00:00,nw_src=0.0.0.0,nw_dst=10.0.0.99,nw_proto=0,nw_tos=0,nw_ecn=0,nw_ttl=0
Megaflow: recirc_id=0,ip,in_port=ANY,nw_dst=10.0.0.99,nw_frag=no
Datapath actions: drop
This flow is handled by the userspace slow path because it:
- Sends "packet-in" messages to the OpenFlow controller/
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