Required [p2p] interface configuration not found. Nexus Dashboard

[TheAnalyst]

During "Recalculate and Deploy" phase after adding switches, I received so many errors for a brownfield deployment which I fixed some of them such as requiring the name UNDERLAY for ospf underlay process and forcing BGP to use private AS numbers but this last one I cannot figure out how to fix:

Switch [S21/9QY3LABZABO]: Underlay is V4. Fabric interface [Ethernet1/1]: Required [p2p] interface configuration not found.
Switch [S21/9QY3LABZABO]: Underlay is V4. Fabric interface [Ethernet1/2]: Required [p2p] interface configuration not found.
Switch [L11/95VDWK8PX55]: Underlay is V4. Fabric interface [Ethernet1/1]: Required [p2p] interface configuration not found.
Switch [L12/91OQSL0QLRK]: Underlay is V4. Fabric interface [Ethernet1/2]: Required [p2p] interface configuration not found.
Switches are still in migration mode. Please resolve all errors and retry Recalculate & Deploy.

My interfaces have this config:

interface Ethernet1/1
 mtu 9216
 medium p2p
 no ip redirects
 ip unnumbered loopback0
 no ipv6 redirects
 ip ospf network point-to-point
 ip router ospf UNDERLAY area 0.0.0.0
 ip pim sparse-mode
 no shutdown

interface loopback0
 ip address 1.1.1.21/32
 ip router ospf UNDERLAY area 0.0.0.0
 ip pim sparse-mode

Could you tell me what config I should have under this interface and others in my fabric to fix this problem? I very much appreciate your help.

[balaji.bandi]

I have not noticed that error depends on your network and what version of NDFC, are you configuring using Cli or template ?

check below guide :

https://www.cisco.com/c/en/us/td/docs/dcn/whitepapers/cisco-ndfc-zero-touch-provisioning-using-inband-poap.html

[TheAnalyst]

Thank you Balaj for the reply. Like I said this is a brownfield deployment and I am connected to devices (virtual devices in my lab) using out-of-band management network.

When adding the switches I decided to keep the configuration intact but in the process of first deployment, it seems that NDFC tries to match the current configuration with it's templates.

Now, with this error, I am not sure what config I should add to the interfaces to fulfill the requirement. It would be nice if you provide a complete standard configuration for a fabric interface in a VXLAN environment.
My guess is NDFC looks for loopback 1 instead of loopback 0 I have used for ip unnumbered command, otherwise I will change the config and give interfaces unique IPs/30. I want to check it on Monday