MPLS networking at PSP Co
Multi-Protocol Label Switching
Presented by:
Hamid Sheikhghanbari
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MPLS networking at PSP Co
• PSP Co.'s networking needs
• How MPLS service meets the needs
• Motivation
• MPLS Basics
• Operation
• Advantages and Disadvantages
• Alternatives to MPLS
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PSP Co.'s networking needs
• Establishing a online connection
between Office and factories for
application
• Establishing VOIP between office and
factories Centralized the network
• Supporting and troubleshooting the
network more efficiently
• Accelerate and enhance the company's
efficiency
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Why MPLS?
• Needed a single infrastructure that supports
multitude of applications in a secure manner
• Provide a highly scalable mechanism that was
topology driven rather than flow driven
• Load balance traffic to utilize network
bandwidth efficiently
• Allow core routers/networking devices to
switch packets based on some simplified
header
• Ultra fast forwarding
• VPN
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Motivation
• IP
o
o
The first defined and used protocol
De facto the only protocol for global
Internet working
… but there are disadvantages
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Motivation (cont.)
• IP Routing disadvantages
Connectionless
- e.g. no QoS
o Large IP Header
- At least 20 bytes
o Routing in Network Layer
- Slower than Switching
o Usually designed to obtain shortest path
- Do not take into account additional metrics
o
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Motivation (cont.)
• ATM
connection oriented
- Supports QoS
o fast packet switching with fixed length
packets (cells)
o integration of different traffic types (voice,
data, video)
o
… but there are also disadvantages
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Motivation (cont.)
• ATM disadvantages
o
o
o
Complex
Expensive
Not widely adopted
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Motivation (cont.)
• Idea: Combine the forwarding
algorithm used in ATM with IP.
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MPLS Basics
• Multi Protocol Label Switching is
arranged between Layer 2 and Layer 3
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MPLS Basics (cont.)
• MPLS Characteristics
Mechanisms to manage traffic flows of
various granularities (Flow Management)
o Is independent of Layer-2 and Layer-3
protocols
o Maps IP-addresses to fixed length labels
o Supports ATM, Frame-Relay and Ethernet
o
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MPLS Basics (cont.)
• Generic label format
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MPLS Operation
• The following steps must be taken for
a data packet to travel through an
MPLS domain.
o
o
o
o
o
label creation and distribution
table creation at each router
label-switched path creation
label insertion/table lookup
packet forwarding
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MPLS Operation Example
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MPLS Advantages
• Improves packet-forwarding
performance in the network
• Supports QoS and CoS for service
differentiation
• Supports network scalability
• Integrates IP and ATM in the network
• Builds interoperable networks
• Use of special services, such as traffic
engineering
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MPLS Disadvantages
• An additional layer is added
• The router has to understand MPLS
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Alternative to MPLS
• Frame Relay
• Point to Point
• ATM
• Leased Line
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Protocol Comparison
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References
• http://en.wikipedia.org/wiki/Multiprotocol_Labe
l_Switching
• http://t1rex.blogspot.com/2010/06/ip-vpn-vsmpls-vpn.html
• http://www.t1rex.com/mplsnetwork.html
• http://www.ietf.org/rfc/rfc3031.txt
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MPLS networking at PSP Co
Q&A
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MPLS networking at PSP Co
Thank you!
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