When running discovery, IP Fabric needs to connect directly to the device
console. Because of that, to discover Quagga/FRR devices, a separate user with a
specific shell needs to be created on a device.
The Quagga / FRR shell usually runs in /usr/bin/vtysh.
A new user with direct access to the Quagga / FRR shell needs to be created as
follows in the bash:
useradd-s/usr/bin/vtyshusername
Afterwards, you will be prompted to set up a password. Add this username and
password to IP Fabric credentials used for discovery.