BENEFITS

• Highly Scalable
• In VPN(Virtual Private Networks) MPLS support any-to-any communication among VPN sites
• for this no requirement of full mesh of PVCs or sub optimal routing.
• Explicit Routing capabilities. 
• It will be possible due to the MPLS Traffic Engineering.
• MPLS enables an ATM switch to perform virtually all of the functions of an IP router.
• Eliminates the dependence on particular OSI layer technology.
• Eliminate the need for multiple layer-2 networks to satisfy different types of traffic.

• Before using the MPLS you must enable the CEF (Cisco Express Forwarding) on the router.
• MPLS terminology
• LSR: Label Switch Routher
• A router forward IP Packets based on the Labels.
• Edge-LSR:
• A router at the end of MPLS network.
• which forward both labeled & unlabeled packets
• Ingress E-LSR:
• A router at an end of MPLS network(Edge-LSR or E-LSR), which add labels to the unlabeled & labeled ip packets.
• Egress E-LSR:
• A router removes the labels of received labeled ip packet & forward as unlabeled.
• CE Router:
• 
  

• Generally in ip routing, packets are forward based on the ip address
• But in MPLS, ip packets are assigned with labels.
• Gnerally when forwarding ip packet, whole packet will be read. then forward
• But in MPLS, read only the top label, based on thins info ip packet will be forwarded 
• Today MPLS is, for the most part, a standardized version of Cisco's proprietary "tag switching".

MPLS

MPLS: (Multip Protocol Label Switching)

Introduction: