Type of Tunneling Model supported on the LSR. With the Pipe Model, MPLS tunnels (aka LSPs) are used to hide the intermediate MPLS nodes between LSP Ingress and Egress from the Diff-Serv perspective. With the Short Pipe Model, the Diff-Serv forwarding treatment at the LSP Egress is applied based on the 'Tunneled Diff-Serv Information' (i.e., Diff-Serv information conveyed in the encapsulated header) rather than on the 'LSP Diff-Serv information' (i.e., Diff-Serv information conveyed in the encapsulating header). With the Uniform Model, MPLS tunnels (aka LSPs) are viewed as artifacts of the end-to-end path from the Diff-Serv standpoint. In this model, any packet contains exactly one piece of Diff-Serv information which is meaningful and is always encoded in the outer most label entry (or in the IP DSCP where the IP packet is transmitted unlabelled for instance at the egress of the LSP).