MPLS MultiProtocol Label Switching

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MPLSMultiProtocol Label Switching

• Leonardo Chen

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Outline

• Traditional IP Forwarding
• MPLS !
• Traffic Engineering and MPLS
• SNMP
• Demo

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Traditional IP Forwarding

• Robust Architecture
• Packets routed independently. Each hop processes
  routing
• Follows the best path
• Over utilizes best-paths
• Under utilizes less good paths

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Traditional IP Forwarding
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MPLS

• MPLS Multi Protocol Label Switching
• Incoming packets are assigned a label by edge
  router
• Packets are routed based only on the label
  through the network

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MPLS
?
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MPLS Advantages

• Simpler to switch

• Moves processing to edges. Core only forwarding.
  Scalable.
• Traffic Engineering
• Possible to define the path to be followed
• Priorities and QoS
• Tunneling without encryption

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Traffic Engineering
Labels can be used to create tunnels
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Traffic Engineering

• Control traffic flow in the network
• Improve network performance
• Offer premium service
• Tactical network problems

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Preemption
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Traffic Engineering

• Control traffic flow in the network
• Improve network performance
• Offer premium service
• Tactical network problems
• Network Design x Traffic Engineering
• Edge router defines Forward Equivalence Class
  (FEC) for a packet flow

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IP Forward x
MPLS

• Hop by hop routing
• Builds path trees fragment by fragment
• Reroute in failure impacted by convergence time
  of routing protocol
• Difficult to perform traffic eng, QoS routing

• Explicit routing.
• Path from source to destination
• LSP can be ranked to reroute quickly
• Flexibility (QoS or Policy)
• Adapts well to TE

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The Project - CS6255
SNMP Get
SNMP Set
Broadband and Wireless Networking Lab - ECE Dr.
Ian Akyildiz
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Demo
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SNMP

• CiscoMIB mplsLsrMIB Experimental 96
• mplsTunnelConfigured of tunnels
• mplsTunnelTable Tunnel configurations
• Index
• Source, Destination
• mplsTunnelResourceTable Specs
• Max rate
• Mean rate
• Burst size

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SNMP

• mplsTunnelARHopTable Route taken
• mplsTunnelPerfTable Performance
• Packets, errors, bytes
• MIB being developed by IETF (Oct2001)
• Traffic Engineering Information
• Traffic Tunnel Information

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Conclusion

• MPLS Standard Status
• Gone to last call IETF
• Multivendor Interoperability demonstrated by
  Cisco Nortel at Interop/99
• Possible technology for Internet2

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Questions?
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Questions

• What is the difference between the traditional IP
  forwarding and MPLS?
• What is traffic engineering and why it should be
  used?
• How can MPLS help in traffic engineering?