On 01/13/2016 02:11 PM, Guru Shetty wrote: > > > On 13 January 2016 at 11:06, Kevin Benton <[email protected] > <mailto:[email protected]>> wrote: > > Hi, > > I looked through the list and see that someone already asked about > multicast addresses as a target for VXLAN tunnels[1]. Since it's not > supported, what is the suggestion to prevent broadcast/multicast > traffic in a tenant's network from wiping out the network due to the > duplication cost? > > This is something the current OVS plugin for Neutron in OpenStack > suffers from and it seems OVN will have the same issue as far as I > can tell. > > > Assuming I understood your statement correctly, with OVN, only one > broadcast packet goes in the tunnel and then it gets replicated in the > hypervisor. So the load is on the CPU instead of the network.
1 copy per hypervisor, right? meaning if a logical switch has at least 1 logical port across 100 hypervisors, it will be sent out 100 times. > For example, without severely rate-limiting or completely blocking > broadcast/multicast, a tenant network with 100 VMs on it can max out > a 10 Gbps interface adapter with a 100 mbps broadcast/multicast stream. > > 1. http://openvswitch.org/pipermail/discuss/2015-December/019632.html -- Russell Bryant _______________________________________________ discuss mailing list [email protected] http://openvswitch.org/mailman/listinfo/discuss
