[ovs-discuss] Multi-Node RSPAN Mirroring

Bryan Richardson bryan at activeshadow.com
Fri Aug 31 01:56:07 UTC 2018


> On Aug 30, 2018, at 17:38, Ben Pfaff <blp at ovn.org> wrote:
> 
>> On Thu, Aug 30, 2018 at 04:15:33PM -0600, Bryan Richardson wrote:
>>> On Thu, Aug 30, 2018 at 3:05 PM Ben Pfaff <blp at ovn.org> wrote:
>>> 
>>> I don't see anything in your description about setting flood_vlans.  If
>>> you didn't do that, then please read the description of the setting in
>>> ovs-vswitchd.conf.db(5).
>>> 
>> 
>> Thank you for the hint. I just set flood_vlans equal to my output-vlan on
>> the host I'm sourcing the mirrored traffic from. My capture VM is connected
>> to the RSPAN VLAN (output-vlan) on a different host, with no special OVS
>> configuration, and I'm still not seeing any of the mirrored traffic in the
>> VM. I do see the traffic leaving the host sourcing the mirrored traffic on
>> the RSPAN VLAN, so I think it's an issue with the physical switch that
>> trunks the two hosts together.
> 
> Keep in mind that the physical switches would also need to know to flood
> RSPAN VLANs.

So my physical switch that I’m trunking the OVS switches to is a Cisco 3560, and I configured the output-vlan as remote-span thinking that would disable MAC learning to flood the mirrored packets. It didn’t seem to make a difference though... I’m still not seeing any of the RSPAN traffic hit the trunked interface of the second host. 


More information about the discuss mailing list