Thank you very much for your answer.
By setting the controller connection out of band I solved
the problem.
Best regards,
Fabio Mignini
On Wed, 18 Mar 2015 08:41:19 -0700
Ben Pfaff <b...@nicira.com> wrote:
On Tue, Mar 17, 2015 at 06:57:58PM +0100, MIGNINI FABIO
wrote:
I have noticed an unexpected generation of traffic loop
using a very simple
configuration of KVM and OVS.
In particular the configuration that trigger the problem
is the one listed
below:
+-----------------+
| Virtual machine |
+----+-------+----+
| |
+------+-------+------+
| |
| OVS Bridge |
+---------------------+
The OVS Bridge has two ports that are connected to the
virtual machine.
Within the virtual machine there is a linux bridge that
bridges both the
vm's interfaces.
I found the problem with two different configuration of
the bridge:
- setting an existing OF controller (OpenDaylight)
- setting a fake address for the OF controller
(a not reachable IP
address)
This is the output of the 'ovs-vsctl show' command (I
provide here only the
second configuration, as you can see the controller is
not connected):
root@controller:~# ovs-vsctl show
82f530a0-269e-4eb4-b71a-dedc9f26ccd9
Bridge br-int
Controller "tcp:192.168.5.3:6633"
Port br-int
Interface br-int
type: internal
Port "vnet1"
Interface "vnet1"
Port "vnet0"
Interface "vnet0"
ovs_version: "2.3.1"
The only flow in the OVS bridge "br-int" is a DROP flow,
without any match
(inserted manually before the starting of the virtual
machine).
This is the output of the 'ovs-ofctl dump-flows br-int'
command:
root@controller:~# ovs-ofctl dump-flows br-int
NXST_FLOW reply (xid=0x4):
cookie=0x0, duration=232.952s, table=0, n_packets=0,
n_bytes=0,
idle_age=232, priority=1 actions=drop
With this configuration I was expecting that all the
traffic will be dropped
by the OVS Bridge (as happens when no controller is
setted).
Instead a traffic loop is generated between the two
ports in the bridge.
It seems that the DROP flow rule is not working as
expected.
One possibility is that you've got hidden flows due to
the in-band
controller configuration. Try "ovs-appctl
bridge/dump-flows br-int" to
check for thtat.
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