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MPLS



Multi-Protocol Label Switching (MPLS)is a data-carrying mechanism that emulates some properties of a circuit-switched network over a packet-switched network. MPLS is a switching mechanism that imposes labels (numbers) to packets and then uses those labels to forward packets. The labels are assigned on the edge of the MPLS of the network, and forwarding inside the MPLS network is done solely based on labels. Labels usually correspond to a path to layer 3 destination addresses (equal to IP destination-based routing). MPLS was designed to support forwarding of protocols other than TCP/IP. Because of this, label switching within the network is performed the same regardless of the layer 3 protocol. In larger networks, the result of MPLS labeling is that only the edge routers perform a routing lookup. All the core routers forward packets based on the labels, which makes forwarding the packets through the service provider network faster. (Most companies are replacing their Frame Relay networks with MPLS today).



On Router 1

Router # config terminal
Router (config)#mplsip
Router (config)#mpls label protocol ldp
Router (config)#mplsldp router-id loopback 0
Router (config)# interface fastethernet 0/0
Router (config-if)#mplsip


On Router 2

Router # config terminal
Router (config)#mplsip
Router (config)#mpls label protocol ldp
Router (config)#mplsldp router-id loopback 0
Router (config)# interface fastethernet 0/0
Router (config-if)#mplsip
Router (config)# interface fastethernet 1/0
Router (config-if)#mplsip


On Router 3

Router # config terminal
Router (config)#mplsip
Router (config)#mpls label protocol ldp
Router (config)#mplsldp router-id loopback 0
Router (config)# interface fastethernet 0/0
Router (config-if)#mplsip












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