Which Cisco certification covers MPLS technology?
CCIP covers MPLS.
You need to take 642-611 Exam.
You can take CCIP MPLS exam but before that you need to have proper understanding of the Routing environment so its better to go for whole CCIP which will cover your Routing-IGP, BGP, MPLS and QOS so it will make your foundation strong and learning process easy...
Kindly check the following:
And please be ware that it is one of the challenging exams.