On Sat, Mar 23, 2019 at 2:18 AM wenxu <we...@ucloud.cn> wrote: > > On 2019/3/23 下午3:50, Pravin Shelar wrote: > > On Thu, Mar 21, 2019 at 3:34 AM <we...@ucloud.cn> wrote: > > From: wenxu <we...@ucloud.cn> > > There is currently no support for the multicasti/broadcst aspects > of VXLAN in ovs. In the datapath flow the tun_dst must specific. > But in the IP_TUNNEL_INFO_BRIDGE mode the tun_dst can not be specific. > And the packet can forward through the fdb of vxlan devcice. In > this mode the broadcast/multicast packet can be sent through the > following ways in ovs. > > ovs-vsctl add-port br0 vxlan -- set in vxlan type=vxlan \ > options:key=1000 options:remote_ip=flow > ovs-ofctl add-flow br0 in_port=LOCAL,dl_dst=ff:ff:ff:ff:ff:ff,\ > action=output:vxlan > > bridge fdb append ff:ff:ff:ff:ff:ff dev vxlan_sys_4789 dst 172.168.0.1 \ > src_vni 1000 vni 1000 self > bridge fdb append ff:ff:ff:ff:ff:ff dev vxlan_sys_4789 dst 172.168.0.2 \ > src_vni 1000 vni 1000 self > > This would make datapath bit complicated, can you give example of such > use-case? > > There is currently no support for the multicast/broadcast aspects > of VXLAN in ovs. To get around the lack of multicast support, it is possible > to > pre-provision MAC to IP address mappings either manually or from a controller. > > With this patch we can achieve this through the fdb of the lower vxlan > device. > > For example. three severs connects with vxlan. > server1 IP 10.0.0.1 tunnel IP 172.168.0.1 vni 1000 > server2 IP 10.0.0.2 tunnel IP 172.168.0.2 vni 1000 > server3 IP 10.0.0.3 tunnel IP 172.168.0.3 vni 1000 > > All the broadcast arp request from server1, can be send to vxlan_sys_4789 > in IP_TUNNEL_INFO_BRIDGE mode. Then the broadcast packet can send through > the fdb table in the vxlan device as following: > > bridge fdb append ff:ff:ff:ff:ff:ff dev vxlan_sys_4789 dst 172.168.0.1 \ > src_vni 1000 vni 1000 self > bridge fdb append ff:ff:ff:ff:ff:ff dev vxlan_sys_4789 dst 172.168.0.2 \ > src_vni 1000 vni 1000 self > > > Not any for multicast case. This patch make ovs vxlan tunnel using the fdb > table of lower vxlan device.
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