
MPLS: MultiProtocol Label Switching ◾ 161
removes both labels before handing the packet over to its destination using the
IP address.
Figure 7.23 provides an example of label switching through two segments. e
leading segment is swapped at each LSR and the trailing label is retained.
MPLS Core
e MPLS backbone is turning out to be a significant development in WAN services.
MPLS enables relatively easy provisioning of virtual private network (VPN) con-
nections among enterprise locations as well as to partner and supplier locations.
Using an MPLS-based WAN service, an enterprise can consolidate Internet
access, storage, file sharing, daily point-