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Delete all the existing networks & ports.
Recreate & DBsync neutron DB
Do the below configurations in /etc/neutron/plugins/ml2/ml2_conf.ini file.

[ml2]

tenant_network_types = vlan
type_drivers = local,flat,vlan,gre,vxlan
mechanism_drivers = openvswitch


[ml2_type_flat]

[ml2_type_vlan]

network_vlan_ranges = physnet2:1000:2999

[ml2_type_gre]

[ml2_type_vxlan]

[securitygroup]

enable_security_group = True
enable_ipset = True
firewall_driver = neutron.agent.linux.iptables_firewall.OVSHybridIptablesFirewallDriver


[ovs]
local_ip = 10.32.5.42
tenant_network_type = vlan
integration_bridge = br-int
network_vlan_ranges = physnet2:1000:2999
bridge_mappings = physnet2:br-em2

Delete all the existing networks & ports.

Recreate & DBsync neutron DB
(You already have both VLAN & GRE in type drivers so neutron DB recreation and Sync may not required)

Do the below configurations in /etc/neutron/plugins/ml2/ml2_conf.ini file.

[ml2]

tenant_network_types = vlan
type_drivers = local,flat,vlan,gre,vxlan
mechanism_drivers = openvswitch


[ml2_type_flat]

[ml2_type_vlan]

network_vlan_ranges = physnet2:1000:2999

[ml2_type_gre]

[ml2_type_vxlan]

[securitygroup]

enable_security_group = True
enable_ipset = True
firewall_driver = neutron.agent.linux.iptables_firewall.OVSHybridIptablesFirewallDriver


[ovs]
local_ip = 10.32.5.42
tenant_network_type = vlan
integration_bridge = br-int
network_vlan_ranges = physnet2:1000:2999
bridge_mappings = physnet2:br-em2