[ovs-discuss] Sflow packet samples in Openstack environment on OVS bridge

Peter Phaal peter.phaal at inmon.com
Wed Apr 22 14:30:41 UTC 2015

The sFlow implementation in OVS applies ingress sampling. To get full coverage into all traffic paths you need to enable sFlow on all bridges. For OpenStack, enabling sFlow on br-ex should give you visibility into the traffic destined to VMs.

You may also want to take a look at the Host sFlow agent (http://host-sflow.sourceforge.net/ <http://host-sflow.sourceforge.net/>). It can automatically manage the OVS sFlow settings and will also export hypervisor and VM CPU, memory, disk and network IO stats.

> On Apr 22, 2015, at 12:46 AM, harsh jain <harshjain32 at gmail.com> wrote:
> Hi,
> I tried to collect sflow packet on OVS switch in Openstack. But captured paackets contain only traffic coming out from the VM i.e samples contain Raw Packet of VM to external network direction only.following command is used to enable 
> export COLLECTOR_IP=
> export COLLECTOR_PORT=6343
> export AGENT_IP=eth1
> export HEADER_BYTES=256
> export SAMPLING_N=1
> export POLLING_SECS=10
> ovs-vsctl -- --id=@sflow create sflow agent=${AGENT_IP} target=\"${COLLECTOR_IP}:${COLLECTOR_PORT}\" header=${HEADER_BYTES} sampling=${SAMPLING_N} polling=${POLLING_SECS} -- set bridge br-int sflow=@sflow
> Connection is 
> VM ->tap device->br-int(sflow enabled)-----veth-pair----->br-data-eth.
> Why packets are colected for 1 direction only?
> Thanks & Regards
> Harsh Jain
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