On Mon, Jul 13, 2015 at 1:06 AM, David Reade <d.re...@reades.co.uk> wrote: > Good morning all! > > I am using XenServer 6.5 SP1 with OpenVSwitch 2.1.3 and I need to mirror > traffic from the source port (vif2.0) to the destination port (vif13.1). I > have enabled promiscuous mode on the PIF and target VIF. Using the following > command, I can enable traffic mirroring and see the results instantly: > > ovs-vsctl -- set Bridge xenbr1 mirrors=@m \ > -- --id=@vif2.0 get Port vif2.0 \ > -- --id=@vif13.1 get Port vif13.1 \ > -- --id=@m create Mirror name=MyMirror select-all=true output-port=@vif13.1 > > However the port information changes every time the source/target VM is > rebooted. This means I have to keep re-adding the mirror every time I reboot > a VM using different VIFs which is not practical.
It has bee a while that I have used Xenserver, so I have a couple of counter questions for you. When a VM is rebooted, does Xenserver delete the vif and re-add it? Does it get added with a different vif name? You can test it with doing a 'ovs-vsctl show' before the shutdown. Again after "shutdown" and again after "start". If I remember correctly the name remains the same. But it likely deletes it and re-adds it. If it does the latter, I see how your mirror configuration gets destroyed. Usually such situations are handled via a controller, which watches OVSDB for changes and re-creates the mirror if it gets destroyed. If you don't want to use a cron job, another option is to not setup your mirror on the same bridge that has your vif attached. You can use a different bridge for each of your vif and then connect them to a separate bridge via a OVS patch port. You can add your mirror on this separate bridge which does not get effected with vm reboots. > > I have devised a way to get the current VIF ID and send it to OVS using a > cron job or shell script. However I would prefer to just run a single command > without resorting to cron jobs and shell scripts as they need managing > themselves. > > Is there a way to setup traffic mirroring to run permanently which is > unaffected by VM reboots? > > Thanks in advance, > > David > _______________________________________________ > discuss mailing list > discuss@openvswitch.org > http://openvswitch.org/mailman/listinfo/discuss _______________________________________________ discuss mailing list discuss@openvswitch.org http://openvswitch.org/mailman/listinfo/discuss
