I am running csr1000v version 15.5(2)S with IOS-XE version 03.15.00.S on Ubuntu 20.04 LTS. My csr1000v is currently under no license. I can configure bfd on the GibabitEthernet interface and the OSPF router but cannot configure bfd in the DMVPN tunnel interface. I run OSPF over the DMVPN tunnels connecting to other routers and want to configure bfd to monitor the DMVPN links so that it will detect the link failures and inform the OSFP router. I don't know if my problem was caused by the lack of csr1000v license.
Please let me know how I can configure bfd on the DMVPN interface in csr1000v. Thanks.