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Multiprotocol Label Switching
Done by:
Sara M Alarfaj
200800393
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Outline:
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Overview
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What is multi protocol label switching (MPLS)?
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MPLS Background
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MPLS Basics
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Basic Model for MPLS Network
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Benefits of MPLS
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MPLS Video
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Overview
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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.
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What is multi protocol label switching
(MPLS)?
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Multi Protocol – supports protocols even other than IP
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Label – short fixed length identifier to determine a route
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Supports IPv4, IPv6, IPX, AppleTalk at the network layer
Supports Ethernet, Token Ring, FDDI, ATM, Frame Relay, PPP at
the link layer
Labels are added to the top of the IP packet
Labels are assigned when the packet enters the MPLS domain
Switching – forwarding a packet
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Packets are forwarded based on the label value
NOT on the basis of IP header information
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MPLS Background:
 Integration
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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
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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 :
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<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
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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
 Routing
can focus on capacity and performance
information obtained using a common intra
domain routing protocol such as OSPF
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Basic Model for MPLS Network:
LSR = Label Switched Router
LER = Label Edge Router
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Benefits of MPLS:
Five reasons to move to MPLS:
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1. Cost savings
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2. QOS enablement.
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3. Improved performance.
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4. Disaster recovery.
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5. Future proofing the network.
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The Primary Benefit of MPLS:
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Is to eliminate dependence data link layer like technology
like: ATM, Frame Relay, or Ethernet.
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MPLS Video:
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http://www.youtube.com/watch?v=E5Ud1m9h0yc
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References:
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http://www.research.ibm.com/mplsws/publications/mpls1.p
df
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http://www.networkworld.com/research/2007/040207-mplsmigration-reasons.html
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http://www.cisco.com/en/US/products/ps6557/products_ios
_technology_home.html
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http://en.wikipedia.org/wiki/Multiprotocol_Label_Switching
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