MPLS: The Magic Behind the Myths - Rice University
MPLS: The Magic Behind the Myths Grenville Armitage (author) Scott Crosby (presenter) Problems with IP No Quality of Service Necessary for converged network Realtime voice Best-effort data High priority transactions (ATM, control, VC, ) Performance Scalability Expensive prefix match for each packet Traffic Engineering
Problems with IP Tunneling Tunnel IP over non-IP intermediate IP over IP over ATM? IP Network IP Network ATM IP Network IP Network Problems with IP Tunneling
Tunnel IP over non-IP intermediate Virtual Private Network Abercr. CS IP Network Abercr. EE IP Network Duncan EE IP Network Duncan CS IP Network
Problems with IP Tunneling Tunnel IP over non-IP intermediate Virtual Private Network Traffic Engineering IP Network IP Network IP Network IP Network
What is MPLS? Virtual circuit layer underneath IP Virtual circuit = virtual wire = label switched path IP Network (Voice) IP Network (ATM) IP Network (Data) MPLS (Virtual Point-to-Point Circuits) Physical Infrastructure
(Point-to-Point Circuits) What is MPLS? Offer service above IP Converged network Realtime voice Best-effort data High priority transactions (ATM, control ) On the same physical infrastructure Hop-by-hop QoS differentiation How Does MPLS Work? Packets are tagged and routed based on tags. All traffic with the same label treated the same
13 5 IP Routing Layer Payload Payload IP Routing Layer LSR LSR Payload
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