Can someone explain we what is CER and PER and in which network we use them?
I am glad that the answers that Sundar and I provided were able to resolve your question. Thank you for using the rating system to indicate that your question was resolved (and thanks for the rating). It makes the forum more useful when people can read a question and can know that they will read responses that did resolve the question.
The forum is an excellent place to learn about Cisco networking. I encourage you to continue your participation in the forum.
We frequently see these terms used in MPLS networks. the Customer Edge Router (CER) is the router on the Customer side of the connection and that provides connectivity to the interior of the Customer network and to the MPLS cloud. the Provider Edge Router (PER) is the router on the Provider side of the connection and that provides connectivity from the MPLS cloud to the Customer network.