You have configured your Cisco ASR 901 on the network, created a loopback interface for
use with PTP, and assigned the address as a PTP source interface. Why are you unable to

ping the interface address?

A.
There is no reason for the interface to not ping; there must be a routing issue.

B.
The interface is shut down and therefore not pingable. Issue the no shut command on the
interface.

C.
The loopback addresses assigned as a PTP clock source are not pingable.

D.
The loopback addresses on a Cisco ASR 901 are not pingable.