Hi All, Please find the below screen shot and my neutron configuration details. I need you guys help me to fix this issue. Please suggest me how could I fix the issue, so that my router gateway can be alive and pingable..

------------------ dhcp_agent.ini ------------------------
[DEFAULT]
auth_strategy = keystone
interface_driver = neutron.agent.linux.interface.OVSInterfaceDriver
dhcp_driver = neutron.agent.linux.dhcp.Dnsmasq
external_network_bridge = br-ex
user_namespaces = True
state_path=/var/lib/neutron
verbose = True
dnsmasq_config_file = /etc/neutron/dnsmasq-neutron.conf
[keystone_authtoken]
auth_host = 192.168.2.51
admin_tenant_name = services
admin_user = neutron
admin_password = neutron

----------------- neutron.conf -------------------------
[DEFAULT]
auth_strategy = keystone
rpc_backend = neutron.openstack.common.rpc.impl_kombu
rabbit_host = 192.168.2.51
rabbit_port = 5672
rabbit_userid = neutron
rabbit_password = neutron
core_plugin = neutron.plugins.ml2.plugin.Ml2Plugin
service_plugins = neutron.services.l3_router.l3_router_plugin.L3RouterPlugin
force_gateway_on_subnet = True
notify_nova_on_port_status_changes = True
notify_nova_on_port_data_changes = True
nova_url = http://192.168.2.52:8774/v2
nova_admin_username = nova
nova_admin_tenant_id = 89bb93fbbf6d41f1b6183a3921fc208c
nova_admin_password = nova
nova_admin_auth_url = http://192.168.2.51:35357/v2.0
notification_driver = neutron.openstack.common.notifier.rpc_notifier
router_scheduler_driver = neutron.scheduler.l3_agent_scheduler.LeastRoutersScheduler
[quotas]
[agent]
[keystone_authtoken]
auth_host = 192.168.2.51
admin_tenant_name = services
admin_user = neutron
admin_password = neutron
auth_uri = http://192.168.2.51:5000
auth_protocol = http
auth_port = 35357
[database]
connection = mysql://neutron:neutron@192.168.2.51/neutron_ml2
[service_providers]
service_provider=LOADBALANCER:Haproxy:neutron.services.loadbalancer.drivers.haproxy.plugin_driver.HaproxyOnHostPluginDriver:default
service_provider=VPN:openswan:neutron.services.vpn.service_drivers.ipsec.IPsecVPNDriver:default

---------------- l3_agent.ini --------------------------
[DEFAULT]
debug = False
resync_interval = 30
interface_driver = neutron.agent.linux.interface.OVSInterfaceDriver
dhcp_driver = neutron.agent.linux.dhcp.Dnsmasq
external_network_bridge = br-ex
bridge_mappings = physnet1:br-ex
user_namespaces = True
state_path=/var/lib/neutron
metadata_ip = 192.168.2.53
metadata_port = 8755
verbose = True

---------------- metadata_agent.ini --------------------------
[DEFAULT]
auth_url = http://192.168.2.51:5000/v2.0
auth_region = RegionOne
admin_tenant_name = services
admin_user = neutron
admin_password = neutron
auth_strategy = keystone
nova_metadata_ip = 192.168.2.52
metadata_proxy_shared_secret = neutron
verbose = True
[keystone_authtoken]
auth_host = 192.168.2.51
admin_tenant_name = services
admin_user = neutron
admin_password = neutron

---------------- /etc/neutron/plugins/ml2/ml2_conf.ini --------------------------
[ml2]
tenant_network_type = gre
type_driver = flat,gre
tenant_network_types = gre
mechanism_drivers = openvswitch
[agent]
l2_population = True
[DATABASE]
sql_connection = mysql://neutron:neutron@192.168.2.51/neutron_ml2
[ml2_type_flat]
flat_networks = external
[ml2_type_gre]
tunnel_id_ranges = 1:1000
[securitygroup]
firewall_driver = neutron.agent.linux.iptables_firewall.OVSHybridIptablesFirewallDriver
enable_security_group = True
[OVS]
bridge_mappings = physnet1:br-ex
local_ip = 192.168.2.53
tunnel_type = gre
enable_tunneling = True

---------------- rootwrap.conf --------------------------
[DEFAULT]
filters_path=/etc/neutron/rootwrap.d,/usr/share/neutron/rootwrap,/etc/quantum/rootwrap.d,/usr/share/quantum/rootwrap
exec_dirs=/sbin,/usr/sbin,/bin,/usr/bin
use_syslog=False
syslog_log_facility=syslog
syslog_log_level=ERROR
[xenapi]
xenapi_connection_url=<None>
xenapi_connection_username=root
xenapi_connection_password=<None>

----------------Service Status--------------------------
openstack-service status neutron
neutron-dhcp-agent (pid 3303) is active
neutron-l3-agent (pid 3302) is active
neutron-metadata-agent (pid 2048) is active
neutron-openvswitch-agent (pid 3304) is active
neutron-ovs-cleanup (pid 0) is inactive
neutron-server (pid 2034) is active

----------------Virtual Switch Output--------------------------
@neutron neutron(keystone_admin)]#ovs-vsctl show
7aec5db2-705d-49d4-bc9d-87dd3eb2e0f0
    Bridge br-int
        fail_mode: secure
        Port phy-br-int
            Interface phy-br-int
        Port br-int
            Interface br-int
                type: internal
        Port "tap61f1fb22-f7"
            tag: 1
            Interface "tap61f1fb22-f7"
                type: internal
        Port "qr-df609386-a2"
            tag: 1
            Interface "qr-df609386-a2"
                type: internal
        Port int-br-int
            Interface int-br-int
        Port int-br-ex
            Interface int-br-ex
        Port patch-tun
            Interface patch-tun
                type: patch
                options: {peer=patch-int}
    Bridge br-tun
        Port br-tun
            Interface br-tun
                type: internal
        Port patch-int
            Interface patch-int ...