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Hi Suman, Thanks for quick reply. Actually an openstack instance on aio host is not pinging to another instance on compute host. But instances on same aio host are able to ping to each other and able to reach internet. And openstack instances on compute node are having IP as seen in Openstack dashboard but no IP inside vnc console by ifconfig. But tunneling is displayed in odl gui.

ML2CONF.INI contents:

[DEFAULT]
[ml2]
type_drivers = vxlan
tenant_network_types = vxlan
mechanism_drivers=opendaylight
path_mtu = 0
[ml2_type_flat]
[ml2_type_geneve]
[ml2_type_gre]
[ml2_type_vlan]
[ml2_type_vxlan]
vni_ranges =1001:2000
vxlan_group = 239.1.1.2
[securitygroup]
firewall_driver = neutron.agent.linux.iptables_firewall.OVSHybridIptablesFirewallDriver
enable_security_group = True
[ml2_odl]
username=admin
password=admin
url=http://172.27.3.176:8080/controller/nb/v2/neutron

Please see the odl screen captures at: https://ask.openstack.org/en/question/96639/odl-with-openstack-packstack-multinode/

Output of ovs-vsctl show on AIO node:

 [root@openstack-aio ~(keystone_admin)]# ovs-vsctl show
    7d87e2fe-a1e9-404e-bdba-6f3045edf0ac
        Manager "tcp:172.27.3.176:6640"
            is_connected: true
        Bridge br-ex
            Port "qg-9ec3ca45-f4"
                Interface "qg-9ec3ca45-f4"
                    type: internal
            Port br-ex
                Interface br-ex
                    type: internal
            Port "eth0"
                Interface "eth0"
            Port phy-br-ex
                Interface phy-br-ex
                    type: patch
                    options: {peer=int-br-ex}
        Bridge br-tun
            fail_mode: secure
            Port br-tun
                Interface br-tun
                    type: internal
            Port "vxlan-ac1b0375"
                Interface "vxlan-ac1b0375"
                    type: vxlan
                    options: {df_default="true", in_key=flow, local_ip="172.27.3.231", out_key=flow, remote_ip="172.27.3.117"}
            Port patch-int
                Interface patch-int
                    type: patch
                    options: {peer=patch-tun}
        Bridge br-int
            Controller "tcp:172.27.3.176:6653"
                is_connected: true
            fail_mode: secure
            Port "tap75cabadf-e8"
                tag: 1
                Interface "tap75cabadf-e8"
                    type: internal
            Port "qr-614d91f5-f5"
                tag: 3
                Interface "qr-614d91f5-f5"
                    type: internal
            Port "tapad5d2902-8a"
                tag: 2
                Interface "tapad5d2902-8a"
                    type: internal
            Port "tap257dbdcc-e9"
                Interface "tap257dbdcc-e9"
            Port "qr-840ea5cf-fa"
                tag: 2
                Interface "qr-840ea5cf-fa"
                    type: internal
            Port "vxlan-172.27.3.117"
                Interface "vxlan-172.27.3.117"
                    type: vxlan
                    options: {key=flow, local_ip="172.27.3.231", remote_ip="172.27.3.117"}
            Port "tap84c4b6ea-a2"
                tag: 3
                Interface "tap84c4b6ea-a2"
                    type: internal
            Port patch-tun
                Interface patch-tun
                    type: patch
                    options: {peer=patch-int}
            Port br-int
                Interface br-int
                    type: internal
            Port int-br-ex
                Interface int-br-ex
                    type: patch
                    options: {peer=phy-br-ex}
            Port "tap2b5958d8-f2"
                Interface "tap2b5958d8-f2"
        ovs_version: "2.5.0"

Output of ovs-vsctl show on Compute node:

[root@openstack-compute ~(keystone_admin)]# ovs-vsctl show
bdf94f07-4a61-46de-857c-a0a56ab44cb3
    Manager "tcp:172.27.3.176:6640"
        is_connected: true
    Bridge br-tun
        fail_mode: secure
        Port patch-int
            Interface patch-int
                type: patch
                options: {peer=patch-tun}
        Port br-tun
            Interface br-tun
                type: internal
        Port "vxlan-ac1b03e7"
            Interface "vxlan-ac1b03e7"
                type: vxlan
                options: {df_default="true", in_key=flow, local_ip="172.27.3.117", out_key=flow, remote_ip="172.27.3.231"}
    Bridge br-int
        Controller "tcp:172.27.3.176:6653"
            is_connected: true
        fail_mode: secure
        Port br-int
            Interface br-int
                type: internal
        Port patch-tun
            Interface patch-tun
                type: patch
                options: {peer=patch-int}
        Port "vxlan-172.27.3.231"
            Interface "vxlan-172.27.3.231"
                type: vxlan
                options: {key=flow, local_ip="172.27.3.117", remote_ip="172.27.3.231"}
        Port "tap20781d20-20"
            Interface "tap20781d20-20"
        Port "tapa1bb9175-b8"
            Interface "tapa1bb9175-b8"
    ovs_version: "2.5.0"