GRNET May 2001

GRNET2Designing The Optical Internet of

Greece: A case study

Magda ChatzakiDimitrios K. Kalogeras Nassos Papakostas

Stelios Sartzetakis

GRNET May 2001

Structure

• Current Status• Basic Design Principles for GRNET2 • Implementation Considerations of

the 2-layer Architecture for GRNET2

• Implementation Plan

GRNET May 2001

Current Status• Fairly homogeneous infrastructure

– c75xx, Fore ASX-200BX

• IP over ATM over SDH• Technological limits (SAR limits)• No Qos, no service differentiation• Inefficient capacity allocation and

bandwidth management mechanisms

• No IP VPNs

GRNET May 2001

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

GRNET May 2001

Two Layer Architecture• Overview of the existing high

speed NRN network upgrades (Canet3, Abilene)

• Backbone and access network• Backbone capacity = w * Σ access

capacity

GigaPoPArea A Backbone Network

GigaPoPArea C

Traffic ConcentratorArea D

GigaPoPArea B

GRNET May 2001

Design, Dimensioning and QoS Provisioning

• 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. Overprovisioning2. QoS

GRNET May 2001

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 ?)

GRNET May 2001

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.

GRNET May 2001

Internet connectivity

• Downstream congestion on the international lines

• Bandwidth management mechanism to its customers according to a predefined policy

GRNET May 2001

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

GRNET May 2001

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

GRNET May 2001

Core – Access Arch. (WAN layout)

N x 2 .5 G bps P oSN x 622 M bps / 2 .5G bps P oSN x 622 M bps / 2 .5G bps P oS (backup)

Athens

Crete

ThessalonikiXanthi

Ioannina

Larissa

Patra

GRNET May 2001

GigaPoP General Layout

Customer NetworkGigabit Ethernet

Switch

Router

GigaPoP

Access Gigabit Ethernetswitch

GigabitRouter LSRAccess ATM

Switch

WAN / MAN

WDMADM

WDM ADM

WDMADM

BackboneNetwork

Optical Wavelength

Optical WavelengthOptical WavelengthOptical Wavelength

Gigabit EthernetΑΤΜ / OC-3

Access Router

WAN / MAN

Customer NetworkGigabit Ethernet

Switch

Router

GigaPoP

Access Gigabit Ethernetswitch

GigabitRouter LSRAccess ATM

Switch

WAN / MAN

WDMADM

WDM ADM

WDMADM

BackboneNetwork

Optical Wavelength

Optical WavelengthOptical WavelengthOptical Wavelength

Gigabit EthernetΑΤΜ / OC-3

Access Router

WAN / MAN

GRNET May 2001

Distributed Gigapop (MAN)

G R -N et accessrou ter (M P LS PE )

G igab it R outer (M P LSP )

D W D MA D M

Gig

abit

Eth

erne

tsw

itch

G R -N et accessrou ter (M P LSP E )

W A NG R -N et

C ustom er networkaccess router

O ther networks 'adm in istra tivedom ains

O TEadm in istra tivedom ain

GRNET May 2001

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)

GRNET May 2001

MANs

customernetwork

MAN core network

accessnetwork

customerswitch

customerrouter

GRNET2accessswitch

GRNET2 router(MPLS PE router)

GRNET May 2001

ATHENS MAN Physical topology

GRNET2Central Node

Node of theGRNET2 Athens'MAN core network

GRNET2 customeraccess node

Athens' MANSouthern Ring

Athens' MANNorthern Ring

S1

S2

S3

S4

N1

N2N3

UnprotectedGRNET2 Athens'MAN corenetwork

GRNET2 customerunprotected VPN

GRNET2 customerprotected access

GRNET May 2001

Athens GRNET GigaPoPGRNET GRNET

GRNET

GRNET

GRNET

GRNET

GRNET

GRNET

Athens GigaPoP

AccessRouter

Core Router

GigE Switch

GRNET May 2001

Athens MAN WDM network (1)

λ Service Provider building/ WDM equipment

GRNET IPEquipment

GRNET Customers’ Equipment (Universities, Research Institutes)

GRNET May 2001

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

GRNET May 2001

Athens MAN Requirements (2)

• WDM Networking equipment – 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 May 2001

Athens MAN WDM network (2)

• Core WDM Network composed of a ring of re-configurable 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)

GRNET May 2001

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

GRNET May 2001

IP CoS implementation• Min. Guaranteed capacity service

(IP +) • Voice over IP service • Internet connectivity capacity

management service• Number of Classes not yet

resolved

GRNET May 2001

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

GRNET May 2001

Thank You!