Folks, is there any reason one should be using HDLC as layer 2 encapsulation these days?
I know that PPP provides authentication and information I have is that when it comes to overhead, they are very similar.
In case you see practical reasons or advantages of using HDLC please let me know.
I agree also PPP provides for loopback detection with the PPP magic number, link quality monitor and it is standards based.
you need to add encapsulation ppp in interface configuration
Hope to help