[email protected] Research Activities on Optical Burst Switching at OIRC Jun Kyun Choi, Minho Kang Optical Internet Research Center Information and Communications.

GMPLS over OBS Architecture for Optical Packet InternetJun Kyun Choi, Minho Kang
Optical Internet Research Center
{jkchoi, mhkang}@icu.ac.kr
Conclusion
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in Optical Internet
Optical and network technologies
Aug. 31th. 2000
Apr. 4th. 2001
June.28th. 2001
June.29th. 2001
July.21-25. 2002
Participants
ICU, Soongsil U., Daejeon U., ETRI, KT, Samsung, Haedong, NetsFeel, Nortel Networks (Canada), VPI(Germany), CUBIN (AUS)
Director
Participants
ETRI, Samsung,
ETRI, KT, Samsung,
Wareplus, Telion, Horim
Conclusion
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R : Research
D : Development
C : Commercial
Static OXC
Dynamic OXC
GMPLS+AOBS
OXC: Optical Cross-Connect, WDM: Wavelength Division Multiplexing
Focusing Area
Exchange unit : Variable length – burst
A burst cut through intermediate node without being buffered
Data burst and control packet are transmitted on separate channels
Control packet may reserve duration for transparent optical data burst
to be switched
Characteristics of OBS
How to classify the data burst to provide QoS ?
What is the mechanism to decide the routing path ?
How to manage whole core and edge nodes efficiently ?
How to make OBS module for implementing in real network environment ?
Some Questions for OBS implementation
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GMPLS-based AOBS network architecture and
traffic engineering
AOBS system technologies
buffering, filtering and switching
..
GMPLS , Traffic Engineering network optimization ,
network management ..
network efficiency ,
QoS .
OBS Networks
IP Networks
OBS network IP network
OBS High speed .
, OBS ,
Speed.. .
OBS network application DVD
Core router MEMS switch Ingress Egress data burst display.
IP Network application DVD
3 router Egress display.
LER (Label Edge Router -> Ingress Egress ) .
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Outline
Conclusion
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GMPLS Control Plane for OBS
Supervision of the whole processes in edge and core nodes may be carried out
using GMPLS control plane.
A concrete format and functions of control packet in OBS are not defined yet
and GMPLS header may include suitable attributes related to OBS
By establishing LSP, we can make an explicitly routed path and relieve a burden
of control packet processing
Can also provide traffic engineering functions of GMPLS
Why OBS employs GMPLS as a control plane?
GMPLS extends the MPLS-TE signaling protocols such as RSVP-TE and CR-LDP
GMPLS also extends traditional intra-domain link-state routing protocols
already extended for TE purposes, i.e. OSPF-TE and IS-IS-TE
LMP basic functions are control channel management, link connectivity verification,
link property correlation, fault isolation
Control packet contains not only traditional information to control data burst
but also label information related with GMPLS for finding, making and recovering LSP
Moreover, this LSP is a bidirectional transmission path formed by signaling protocol
and routing protocol
using GMPLS control plane for OBS
GMPLS control plane gives Control Information (CI) to OBS Control Function Block (CFB),
and then OBS CFB carries it over Optical Switch Control Block (OSCB) through Generic Switch Management Protocol (GSMP),
which converts the CI of OBS CFB into the CI suitable for OSCB by changing signaling format.
After that, MEMS in the optical switching function block can work controlled by the CI of OSCB.
Also, we use Ethernet card as the interface of the sender and receiver because we don’t need any other special encapsulation scheme
for the interface.






To Egress N-1
OPM
FT
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When IP packets enter an edge node in GMPLS over OBS network, their headers are processed for routing
and classifying their class based on Type of Service field of IPv4, traffic class field of IPv6, or other CoS and QoS parameters.
In this figure, edge node supports traffic class 1 and 2.
Also, Label Information Base gets information about packets from IPS.
At the same time, control packets, such as Routing Control Packet, Signaling Control Packet, and Burst Control Packet,
are created and processed.
IP/MPLS Network
Perform Explicit Routing on lightpath LSPs with optical switching fabrics
IP/MPLS Router
Optical Edge Router
Optical Edge Router
Optical Edge Router
Domain Service Model
not shown at Client)
Note) UNI: User to Network Interface NNI: Network to Network Interface
MPLS: Multi-Protocol Label Switching GMPLS: Generalized MPLS
Data
Transfer
Unified Service Model
Control & Management Plane
NNI: Network to Network Interface
MPLS: Multi-Protocol Label Switching
Optical Sub-network
Evolution of Optical Access/Metro Network ?
PON-based, RPR-based, or Optical Ethernet ?
Cost and Benefit of Optical Packet Technology ?
Feasibility of Optical Burst/Packet Technology technically and economically
Optical level interleaving is acceptable ?
How to handle short IP Packets ?
Evolution of GMPLS-based Optical Network
Successful Replacement of SONET/SDH ?
Technical Feasibility of Optical Burst Technology
Performance Aspects
Reviews with GMPLS signaling for OBS
Two different approaches on IP-based and Packet-based !
In-band or Out-of-band signaling ?
Review of Market adaptability for Network Deployment
replace or upgrade the existing Terabit Router and newly construct the OBS network ?
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Justification of AOBS+GMPLS
What is the urgent technology for AOBS+GMPLS to be solved
Optical Burst Transmission and Switching Technology
Cost reduction of optical components (tuners, buffer, switch)
Protection and Restoration for OBS
Optical burst transmission and switching technology
OBS switch control
PON-based OBS or OBS-MAC
In view of technology
Fast Circuit Switching with powerful processing module
Real Optical ALOHA or Optical CSMA ?
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Optical Traffic Engineering
Both way for open loop control and closed loop control
GMPLS signaling, multiplexing scheme, scheduled buffering, resource notification, dynamic re-arrangement of optical resources)
Combine Wavelength Assignment/Converter with AOBS switch architecture
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It is necessary to support differentiated services for
QoS guaranteed multi-media applications
QoS performance metrics
Is IP QoS mechanism (Intserv & Diffserv) enough for OBS ?
Mandate the use of buffer
Intserv: Scalability problem
Diffserv: Relative QoS mechanism cannot guarantee a mission critical traffics
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QoS supporting schemes for OBS
Offset time-based scheme
Deflection routing scheme
Burst segmentation scheme
BCP scheduling scheme
Proportional service rate
GMPLS based Absolute QoS Architecture
Goal: Guarantee a strict upper bound of performance
Diverse QoS requirements
Network level security
Dynamic wavelength assignment + Feedback control
No admission control
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Is MPLS-TE operable in OBS networks?
Considerations
Connection-Oriented Routing: delivery of link state information
QoS Guaranteeing
supporting, Contention resolution, Protection
interface with existing network, Testbed
Standardization
Metro ring OBS…
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Conclusion
Proposed a GMPLS Control Plane for AOBS
- An interim solution toward the ultimate optical packet Internet implementation
- suppors QoS, supervision of the whole processes, and Traffic Engineering
We appreciate the graceful support of KOSEF, ETRI, and Samsung on this work
through ERC Project
Thanks
(2) Lots of papers has been published and in many countries and laboratories the researching about OBS has been progressing.
(4) GMPLS framework is not perfect yet. A lot of unexpected conditions should be considered.
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