Multiprotocol Label Switching

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Presentation transcript:

Multiprotocol Label Switching Done by: Sara M Alarfaj 200800393

Outline: Overview What is multi protocol label switching (MPLS)? MPLS Background MPLS Basics Basic Model for MPLS Network Benefits of MPLS MPLS Video

Overview Multiprotocol Label Switching (MPLS): is a mechanism in high-performance telecommunication networks that directs data from one network node to the next based on short path labels rather than long network addresses, avoiding complex lookups in a routing table.

What is multi protocol label switching (MPLS)? Multi Protocol – supports protocols even other than IP Supports IPv4, IPv6, IPX, AppleTalk at the network layer Supports Ethernet, Token Ring, FDDI, ATM, Frame Relay, PPP at the link layer Label – short fixed length identifier to determine a route Labels are added to the top of the IP packet Labels are assigned when the packet enters the MPLS domain Switching – forwarding a packet Packets are forwarded based on the label value NOT on the basis of IP header information

MPLS Background: Integration of layer 2 and layer 3 Simplified connection-oriented forwarding of layer 2 Flexibility and scalability of layer 3 routing MPLS does not replace IP; it supplements IP Traffic can be marked, classified and explicitly routed QoS can be achieved through MPLS

MPLS Basics: 1-A Label Switched Path (LSP) is set up for each route A LSP for a particular packet P is a sequence of routers : <R1,R2………..Rn> 2-Edge routers : analyze the IP header to decide which LSP to use add a corresponding local Label Switched Path Identifier, in the form of a label forward the packet to the next hop

MPLS Basics Count.. 3-Subsequent nodes : just forward the packet along the LSP simplify the forwarding function greatly increase performance and scalability dramatically New advanced functionality for QoS, differentiated services can be introduced in the edge routers Backbone can focus on capacity and performance Routing information obtained using a common intra domain routing protocol such as OSPF

Basic Model for MPLS Network: LSR = Label Switched Router LER = Label Edge Router

Benefits of MPLS: Five reasons to move to MPLS: 1. Cost savings 2. QOS enablement. 3. Improved performance. 4. Disaster recovery. 5. Future proofing the network.

The Primary Benefit of MPLS: Is to eliminate dependence data link layer like technology like: ATM, Frame Relay, or Ethernet.

MPLS Video: http://www.youtube.com/watch?v=E5Ud1m9h0yc

References: http://www.research.ibm.com/mplsws/publications/mpls1.p df http://www.networkworld.com/research/2007/040207-mpls- migration-reasons.html http://www.cisco.com/en/US/products/ps6557/products_ios _technology_home.html http://en.wikipedia.org/wiki/Multiprotocol_Label_Switching