Download TNC-2001

GRNET2
Designing The Optical Internet of Greece:
A case study
Magda Chatzaki
Dimitrios K. Kalogeras
Nassos Papakostas
Stelios Sartzetakis
May 2001
GRNET
Structure
• Current Status
• Basic Design Principles for GRNET2
• Implementation Considerations of the
2-layer Architecture for GRNET2
• Implementation Plan
May 2001
GRNET
Current Status
• Fairly homogeneous infrastructure
– c75xx, Fore ASX-200BX
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IP over ATM over SDH
Technological limits (SAR limits)
No Qos, no service differentiation
Inefficient capacity allocation and
bandwidth management mechanisms
• No IP VPNs
May 2001
GRNET
Basic Design Principles for
GRNET2
• optical transmission
– Fiber lease or λ provisioning
• λ creation through management system
• Minimization of overlay technologies
• link layer protocol consideration
PoS (without Sonet layers), GigE, SRP
May 2001
GRNET
Two Layer Architecture
• Overview of the existing high speed
NRN network upgrades (Canet3,
Abilene)
• Backbone and access network
• Backbone capacity = w * Σ access
capacity
Traffic Concentrator
Area D
GigaPoP
Area A
Backbone Network
GigaPoP
Area B
GigaPoP
Area C
May 2001
GRNET
Design, Dimensioning and
QoS Provisioning
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Suboptimal path selection with
existing network routing protocols
IP traffic engineering - Native MPLS
(VPN, TE)
No clear results based on aggregation
of access traffic characteristics
Results:
1. Overprovisioning
2. QoS
May 2001
GRNET
Support of QoS Differentiation
• QoS and CoS differentiation at layer 3
(i.e. IP QoS)
• traffic identification, classification and
policing on IP layer
• Vendor specific or independent (WFQ,
WRR, RED or WRED )
• End-to-End architecture (virtual wire ?)
• Min. Guarantee for BW, packet loss
(delay ?)
May 2001
GRNET
Support of QoS – cont.
• regulatory infrastructure (DEN ?)
• administrative mechanisms for access
regulation of network resources based
on categories such as users, hosts,
applications, accounts, etc.
May 2001
GRNET
Internet connectivity
• Downstream congestion on the
international lines
• Bandwidth management mechanism to
its customers according to a predefined
policy
May 2001
GRNET
Advanced services
• IPv6 (desired)
• VPN service on λ
• provisioning and management of
guaranteed BW between the access
points and the backbone network
• Large scale conference
May 2001
GRNET
GigaPoPs and Physical Layer
• GigaPoP: a distributed switching and
routing infrastructure
• DWDM with PoS encapsulation for WAN
and GigE for MAN
– N x 2.5 Gbps speeds
– Gigapop in three cities
• A Gigabit Ethernet switch for providing
high speed in the access network
May 2001
GRNET
Core – Access Arch.
(WAN layout)
Xanthi
Thessaloniki
Ioannina
Larissa
Athens
Patra
N x 2.5 Gbps PoS
N x 622 Mbps / 2.5
Gbps PoS
N x 622 Mbps / 2.5
Gbps PoS (backup)
May 2001
Crete
GRNET
GigaPoP General Layout
GigaPoP
WDM
Access Gigabit Ethernet
ADM
switch
WDM ADM
WAN / MAN
Backbone
Network
Access ATM
Switch
Gigabit
Router LSR
Access Router
Gigabit Ethernet
ΑΤΜ / OC-3
Optical Wavelength
Optical Wavelength
Optical Wavelength
Optical Wavelength
WAN / MAN
Router
WDM
ADM
May 2001
Gigabit Ethernet
Switch
Customer Network
GRNET
Distributed Gigapop (MAN)
Customer network
access router
Gigabit Ethernet
switch
GR-Net access
router (MPLS
PE)
DWDM
ADM
WAN
GR-Net
May 2001
GR-Net access
router (MPLS PE)
Gigabit Router (MPLS
P)
Other networks'
administrative
domains
OTE
administrative
domain
GRNET
MAN characteristics
• Ring topology
• access of customer networks = GigE
• Protected Access (e.g. IEEE 802.1d
spanning – tree)
• VPN services to its customers =
separate optical paths in a mesh or ring
topology
• MAN infrastructure (GigE Switch,
Router+GigE)
May 2001
GRNET
MANs
MAN core network
GRNET2 router
(MPLS PE router)
access
network
customer
router
GRNET2
access
switch
customer
switch
May 2001
customer
network
GRNET
ATHENS MAN
Physical topology
N3
N2
Athens' MAN
Northern Ring
N1
GRNET2
Central Node
S1
Athens' MAN
Southern Ring
S4
S2
S3
Node of the
GRNET2 Athens'
MAN core network
GRNET2 customer
access node
May 2001
Unprotected
GRNET2 Athens'
MAN core
network
GRNET2 customer
unprotected VPN
GRNET2 customer
protected access
GRNET
Athens GRNET GigaPoP
Athens GigaPoP
GRNET
GRNET
GRNET
GRNET
GRNET
GRNET
GRNET
GRNET
GigE Switch
Access
Router
Core
Router
May 2001
GRNET
Athens MAN WDM network (1)
λ Service Provider
building/ WDM equipment
May 2001
GRNET IP
Equipment
GRNET Customers’ Equipment
(Universities, Research Institutes)
GRNET
Athens MAN Requirements (1)
• Mandatory/Desirable requirements
• Fiber infrastructure
– >= G.652 (Dispersion Un-shifted Fiber)
– Testing tools for optical parameters’
measurement
– 2 optical paths for each access node
– avoid Single Points of Failure
– Access node distance from WDM core < 10
km
– Support for 15 Access Nodes
May 2001
GRNET
Athens MAN Requirements (2)
• WDM Networking equipment
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–
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May 2001
Frame+bit-rate independent all-optical λ service
Co-location of GRNET IP equipment with WDM
2,5 Gbps physical ring upgradable to 10 Gbps
Wavelength Adaptation capable (via transponders)
Spare λ for testing purposes
Embedded system upgradeable
Multiple frames in a single wavelength (D)
Optical switching/conversion (D)
Support of “Digital Wrapper” (D)
GRNET
Athens MAN WDM network (2)
• Core WDM Network composed of a ring of reconfigurable OADMs
– 80 km optical ring with 10 OADMs (no
regeneration)
– 2,5 Gbps ports (upgradeable to 10Gbps)
– 1-32 λ per node
– 100 Ghz spacing
– Add/drop up to
• 160 Gbs (upgradeable to 640 Gbps)
– Tx/Rx Line - up to
• 80 Gbps East (upgradeable to 320 Gbs East)
• 80 Gbs West (upgradeable to 320 Gbs East)
May 2001
GRNET
Athens MAN WDM network (3)
– Multi rate (up to 2,5 Gbps) 3R Transponders
supporting Gigabit Ethernet, SDH frames, ATM etc.
including 24 Transponder Shelf
– Offers OCh SNC protection – will not be used by
GRNET
– Network Management System – Access to the
NMS is negotiable
• Configuration Management
– End-to-end OCh SNC provisioning
• Fault Management
– Alarm Reporting/Filtering
• Performance Management
– Client layer monitoring
– Future upgrade will support Digital Wrapper
May 2001
GRNET
IP CoS implementation
• Min. Guaranteed capacity service (IP +)
• Voice over IP service
• Internet connectivity capacity
management service
• Number of Classes not yet resolved
May 2001
GRNET
Implementation Plan
• Study phase end by Q2 2001
• Infrastructure RFP by Q3 2001
• λ provisioning starting by Q4 2001
• Cost 30 M Euros
75 % by EU , 25 by National sources
May 2001
GRNET
Thank You!
May 2001
GRNET