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Packet Optimized Optical Transport Solutions A Practical Design and Implementation Approach Marc Teichtahl [email protected] [email protected]
Packet Optimized Optical Transport Solutions
A Practical Design and Implementation Approach
Marc Teichtahl
Packet Optimized Optical Transport Solutions
Presentation overview
• Design overview• Why packet rings ?• Current designs• Removing the transport layer• DTP basics• Robustness and resilience• Aplanned case study
Packet Optimized Optical Transport Solutions
Design Overview
Design Brief
“effect the migration from traditional transmission technologies to a next generation platform optimized for the transmission of purely packetized data”
Packet Optimized Optical Transport Solutions
Why packet rings ?
•Reduction in capital expenditure
•No more SDH/SONET ADM’s
•More efficient use of bandwidth
•statistical multiplexing and spatial resuse
•Single management infrastructure
Packet Optimized Optical Transport Solutions
Current Design
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POS
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POS
ADMADM
ADM
ADM
SDH Tributaries
Packet Optimized Optical Transport Solutions
Whilst robust, this design tends to be inefficientwhen dealing with purely packetized data
•Dedicated protection time slots reserve half the ring at all times.
•Fixed size Point to Point circuits provisioned regardless of actual bandwidth use.
•Cost and complexity reduced as we remove transport layers from the network.```
Packet Optimized Optical Transport Solutions
ADMADM
Provisioned Circuit
Working
Protection
Packet Optimized Optical Transport Solutions
Removing the transport layers
Optical Optical Optical Optical
SONET ATM SONET
ATM
IP
IP IP
IP
Lower Cost, Complexity, & Overhead
Traditional
IP Over ATM POS
IP-OG
Today
Tomorrow
Packet Optimized Optical Transport Solutions
DPT Basics
Out
er r
ing
data
Outer ring control
Inner ring data
Inner Ring Control
Packet Optimized Optical Transport Solutions
2 Rings - Inner and Outer
•Data and control in opposite directions
•Both fibers used concurrently
•Accelerated control propagation for adaptive bandwidth utilization and self-healing.
Packet Optimized Optical Transport Solutions
Framing
•Utilizes SONET/SDH framing
•Runs over all key fiber transport technologies•Dark Fiber•WDM•SONET/SDH point to point and ring
Packet Optimized Optical Transport Solutions
Bandwidth Multiplication
•Spatial re-use - SRP
Traditional ring technologies use source stripping. This is in efficient, SRP uses destination stripping.
Destination stripping allows the destination node to remove the packet from the ring freeing up bandwidth on other non-related paths.
Packet Optimized Optical Transport Solutions
Bandwidth Multiplication
•Dual Fiber
Both fibers carry “working” traffic.
This is unlike SONET which uses dedicated protection bandwidth.
Implemented in an existing network DTP can yield 1:2 (x2) bandwidth multiplier.
Packet Optimized Optical Transport Solutions
Bandwidth Multiplication
•Statistical Multiplexing
No TDM and no provisioned circuits
Provides for statistical over subscription
Can handle elastic burst requirements
Packet Optimized Optical Transport Solutions
Robustness and Resilience
•Intelligent Protection Switching (IPS)
Proactive monitoring and and self-healing throughstandard SONET/SDH overhead bytes.
50ms self-healing layer 1 wrapping
Protection switching hierarchy for multiple concurrent failures
Packet Optimized Optical Transport Solutions
Robustness and Resilience
•Intelligent Protection Switching (IPS)
Doesn’t rely on SONET overhead bytes allowing foruse non-SONET infrastructure such as WDM
50ms IP restoration
Multi-layer aware, the router can now see all 3 layers
Packet Optimized Optical Transport Solutions
A planned case study
4 Phase implementation plan
•Single node SDH tributary
•Semi-Hybrid transport network
•Hybrid network
•Full DPT network
Packet Optimized Optical Transport Solutions
Single node SDH tributarySDHDPT
IP
Packet Optimized Optical Transport Solutions
Semi-Hybrid transport network
SDHDPT DPT
IP END TO END
Packet Optimized Optical Transport Solutions
Hybrid network
IP only
IP only
Packet Optimized Optical Transport Solutions
Full DPT network
IP ONLY END TO ENDTRANSPORT LAYER IS COMPLETELY TRANSPARENT
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Packet Optimized Optical Transport Solutions
Amsterdam
Den Haag
Rotterdam
Antwerp
Brussels
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Packet Optimized Optical Transport Solutions
Amsterdam
Den Haag
Rotterdam
Antwerp
Brussels
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3 phase implementation
• Semi-hybrid trial Amsterdam -> Brussels Point to point
• Hybrid trial Amsterdam -> Brussels Loop
•Full DTP Full DTP loop
Packet Optimized Optical Transport Solutions
Presentation available atPresentation available at
ftp://ftp.layerthree.com/pub/nanog16.pptftp://ftp.layerthree.com/pub/nanog16.ppt
email meemail me
[email protected]@layerthree.com
