I have to connect 2 Data Centers with an Overlay VXLAN. In particular, in each DC there are 2 Cisco ASR9k to provide the connection (not in cluster). I need to have only one Vxlan tunnel. So, i know i have to use the loopback as source interface in nve configuration. How can i share the IP in 2 loopbacks? I know with N9K i can use the same IP address as secondary on the 2 devices. It work with ios xr too??