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Change the neutron tunnel mode of a operational openstack system

Hello all,

I already have a openstack cluser UP & running with VXLAN as the networking overlay for VM-VM overlays. I want to change the overlay from VXLAN to VLAN (or add a second overlay which is VLAN using provider networks). Is there a way to make these changes without building the openstack system again ? What are the steps to change the neutron configuration without affecting the other services or bringing down the system ? Thanks in advance, Regards, Vivek