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Check the IP a command weather Br-ex bridge opened for NIC (Eth1 etc..) or not. if any open the port and add the port to BR-EX bridge. example commands:-

ifup eth1

ovs-vsctl add-port br-ex eth1

check the ip a and check the port is up and add to br-ex

when you lunch the instance DHCP will give the IP address for Instance (local) , later needs to assign floating IP address to instance (it can be done manually or we can provide dhcp ip pool arrange on external network) Note:- by default DHCP enabled in open stack

you should create external network with VLAN segmentation and also create subnets you should create project network and also create subnet

create router and add external network and project networks interface for communicate each other because both are in different network...

hope this information will help you.. let me know if you need any help !!!