On Tue, Feb 26, 2013 at 9:54 AM, Kyle Mestery (kmestery) <kmest...@cisco.com > wrote:
> On Feb 25, 2013, at 10:00 PM, Changbin Liu <changbin....@gmail.com> wrote: > > > > Hi Kyle, > > > > Thanks so much for your reply! > > > > To clarify, I noticed the code was broken recently and have been using > > "3b6f2889400fd340b851c2d36356457559ae6e81", where you fixed one VXLAN > bug in early Jan. > > > > I tried your first way: > > > > ovs-vsctl add-port br5 vxlan5 -- set interface vxlan5 type=vxlan > options:remote_ip=192.168.5.14 options:key=<VNI> options:dst_port=9999 > > > > It works! I used an integer as VNI and via Wireshark I can see it is > correctly set in the packets . Just curious: it works even without > "options:dst_port=9999". Is it necessary to set dst_port here? > > > Great, glad it works! It's not necessary to set the destination port > there, that's useful if you'd like to change it from the default. I had > copied and pasted that from a prior example of mine. > > I see. Thanks! > > Another (less relevant) question is that, has OpenvSwitch's VXLAN > supported STP or similar protocols to avoid loops? We are now using hub and > spoke network topology to get around this issue. > > > I'm not following you here. Do you mean does VXLAN encapsulate STP > packets? Or are you looking for how VXLAN interacts with STP? > > My understanding/experience is that when we create VXLAN tunnels, currently we have to be careful to make sure that the constructed network is loop-free. Is that right? To ensure a loop-free layer-2 network, does OpenvSwitch provide things like STP or users have to implement their own via OpenFlow? > > Changbin > > > > > > On Mon, Feb 25, 2013 at 9:53 PM, Kyle Mestery (kmestery) < > kmest...@cisco.com> wrote: > > On Feb 25, 2013, at 8:40 PM, Changbin Liu <changbin....@gmail.com> > > wrote: > > > Hi folks, > > > > > > I have been using OpenvSwtich for a while and the VXLAN feature is > awesome. We are able to run OpenStack on top of it now. During deployment, > I have one question: how to set the VNI (VXLAN Network ID) of VXLAN > tunnels? I have checked the content of packets, and seems like the VNI > field is all set to zero. I believe VXLAN's VNI (up to 16M in total) is a > great selling point compared to VLAN. I have Googled around but had no luck > finding any useful document. I would really appreciate your help. Thanks! > > > > > > Changbin > > > _______________________________________________ > > > dev mailing list > > > dev@openvswitch.org > > > http://openvswitch.org/mailman/listinfo/dev > > > > Hi Changbin: > > > > There are 2 ways to do it: > > > > Per port, you can use it when creating the VXLAN port like this: > > > > ovs-vsctl add-port br5 vxlan5 -- set interface vxlan5 type=vxlan > options:remote_ip=192.168.5.14 options:key=<VNI> options:dst_port=9999 > > > > This limits you to that particular port having only that VNI when > packets hit it. A more dynamic way to do it is to set the key to "flow" and > program VNIs using flow programming like this: > > > > ovs-vsctl add-port br5 vxlan5 -- set interface vxlan5 type=vxlan > options:remote_ip=192.168.5.14 options:key=flow options:dst_port=9999 > > > > Then you create flows with actions of "set_tunnel" to set the VNI. This > is how OpenStack Quantum with the OVS plugin does things, for example. > > > > BTW: Which version of OVS VXLAN code are you running? The current code > in master is slightly broken waiting for a few commits to go in to fix > things. > > > > Thanks, > > Kyle > > > > >
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