MPLS MPLS Labels Posted on November 11, 2018November 11, 2018 by aretoojay MPLS labels are used by LSR to make forwarding decisions. Each MPLS label is 32 bits wide. A label stack is imposed on an IP packet by the ingress LSR. A MPLS label stack may be of one or more MPLS labels. The format of MPLS label is as below: Thi is a caption for the image. 0