What is the first step to enable MPLS on an IOS-based device?
A.
Enable MPLS at a global level.
B.
Enable tag-switching at the global level.
C.
Enable MPLS switching on the affected interfaces.
D.
Enable Cisco Express Forwarding (CEF) at the global and affected interfaces.
Explanation:
To enable MPLS, you must first enable CEF switching. Depending on the Cisco IOS software version, you may need to establish the range for the label pool. Reference: Cisco Press "Implementing Cisco MPLS" p.3-17