Cisco Confidential © 2010 Cisco and/or its affiliates. All rights reserved. 1
Integrating Optical and L2/L3
Why IPoDWDM Makes Sense
Kevin McGrattan
Consulting Systems Engineer
Joint Techs July 2012
20120718-mcgrattan-WhyIPoDWDM
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• Definition
• Some history and current situation
• What’s changed?
• Why IPoDWDM makes sense today?
• Summary
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Traditional Routing and Switching
+
ITU Grid Optics
+
OTN Framing
+
Platform Integration
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• External Device Integration
• Modem
• CSU/DSU
• M13 mux to channelized DS3
• DWDM Transponders 10G
100G
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• IPoDWDM
Expensive (dedicated) IPoDWDM line cards
mod (4) interface requirement for 10G
Lack of flexibility (always an IPoDWDM port)
• Earlier generation pluggable optics
Fixed wavelengths
Optical performance (or lack of)
Manageability (lack of integration)
• Organization and Behavioral Issues
Separate transport and routing groups
…and management tools
…and operational models
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• Improved pluggable optics
• Full C-band tunable optics
• ITU-T G.709 Encapsulation
Performance Monitoring
Coding gain with Forward Error Correction
OOB communication channel with GCC
• Platform integration
Optical layer visibility
Integrated management
Performance monitoring
Traffic engineering with fast re-route
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• Digital Optical Monitoring (DOM)
• Fixed ITU grid XENPAK
• Fixed ITU grid XFP (better size, power, performance)
• Full C-band tunable ITU grid XFP
• Fixed ITU grid SFP+
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Min Max
XENPAK Pout -1.0 3.0 dBm
Pin (noise limited) -17.0 -7.0 dB
Dispersion Tolerance -500 1600 ps/nm
XFP Pout -1.0 3.0 dBm
Pin (noise limited) -18.0 -7.0 dB
Dispersion Tolerance -500 1600 ps/nm
Transponder Pout 3.0 4.0 dBm
Pin (noise limited) -20.0 -8.0 dB
Dispersion Tolerance -1200 1200 ps/nm
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• Performance management
• Performance improvement
OTUk OH
ODUk OH OPUk OH
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• Optical
Transmit power (opt), receive power (opr), laser bias current (lbr)
• Performance Monitoring
ES, SES, UAS, CV, etc.
Trail Trace Identifier (TTI)
Backward Defect Indication (BDI)
Backward Error Indication (BEI)
Bit-Interleaved Parity (BIP-8)
• Forward Error Correction
Corrected bits
Uncorrectable words
• …plus loopbacks
*non-exhaustive list
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• Capex savings
Lower entry cost to add capacity
Lower sparing costs
No dedicated IPoDWDM cards or transponders to purchase
• Opex savings
Improved alarm correlation
Improved reliability (fewer components and jumpers)
Faster troubleshooting
Faster MTTR
• Optical + IP integration
• End to end SDN Potential
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Optics Type L2/L3 Optics
Power
Transponder
Power
Power
(total)
Optical
Shelf
Slots
XENPAK 8W 0 8W 0
XFP 3.5W 0 3.5W 0
10G Transponder 1.5W 50W 51.5W 1
40G Muxponder 1.5W 143W 144.5W 0.5
(4 channels) (36.1W)
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Reactive Protection Proactive Protection
DWDM
Router
Interface
working
route
protect
route
fail-
over
FEC Limit
Pre
-FE
C B
it E
rro
rs
Rou
ter
Bit E
rro
rs
Time
protect
route
working
route
FEC Limit
Protection Trigger
Pre
-FE
C B
it E
rro
rs
Rou
ter
Bit E
rro
rs
Time
DWDM / ROADM DWDM / ROADM
Hitless
Switch LOF
Gray
Port
On
Router
Trigger
Enabled
Transponder
Gray
Port
On
Router
Transponder
FEC
FEC FEC
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Secure Management
Channel (PPC)
Router Management
• L2/L3 Interface Information
• Routing Protocols
• IP Addressing
• Security
DWDM Management
• L1 Interface Information
• Wavelength Usage
• Power Levels and Thresholds
• Performance Monitoring
• Retains existing operational model
• Respects boundaries between packet / optical administrative groups
15454 MSTP ASR9000
Cisco Transport Controller
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WSON
UNI-C
MSTP
ASR9000
UNI-N
GMPLS
UNI
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• SFP+ Optics
Fixed wavelength only?
• 40G optics support
Including G.709 with FEC and PM
• 100G?
• ONF New Transport Working Group
To discuss other transport technologies, such as optical, circuit, and wireless
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• A 10G connection is still quite useful
• Utilize vacant channel capacity
• Simplify intra-POP x-connects and visibility
• Recurring operational savings (power and space)
• (Relatively) low cost DWDM pluggable optics
• Tunable DWDM optics availability
• G.709 encapsulation (FEC)
• Tight integration with router
• Improved OA&M model (SONET like benefits)
• Any service, any wavelength, any port
• Envision programing IPoDWDM via an API in an SDN environment!