Project Overview “ Internet Information Network Expansion (Info-Bahan) Project” Bangladesh...

Project Overview“ Internet Information Network

Expansion (Info-Bahan) Project”Bangladesh Telecommunications Company Limited

Completed on: June 30, 2011

2

General Information of the Project

• Project Area: Dhaka, Chittagong, Khulna, Rajshahi, Rangpur, Barisal and Sylhet Divisions

• Sponsoring Ministry: Ministry of Post & Telecommunications

• Implementing Agency: Bangladesh Telecommunications Company Limited

3

Information Regarding Loan

• Date of DPP Approval: 22.01.2006• Date of RDPP Approval: 16.09.2009• Donor Agency: Economic Development

Cooperation Fund (EDCF) of Korea• Form of donation: Soft Loan• Amount of Loan: 25 million US Dollar• Particulars of Loan: 0.5% interest rate, 30 years

repayment period with 10 years of grace period.• Loan agreement No. BGD-06, dtd. 11.06.2007

4

Objective of the Project Construction of Higher Capacity Backbone

Transport networks for transportation and routing of IP packet of various ICT services at different cities under Dhaka, Chittagong, Khulna, Rajshahi,Rangpur, Barisal & Sylhet divisions.

Construction of Access networks for various IP based ICT services at different cities under Dhaka, Chittagong, Khulna, Rajshahi, Rangpur, Barisal & Sylhet divisions.

Contribute to build up Digital Bangladesh through building the necessary infrastructure for various IP based ICT services

5

Information regarding DPP of the Project

• Project Cost (In lakh Taka):GoB DPA Total

(FE) Original PP 10,973.86 17,033.40 28007.3

(2143.94)1st Revision 11951.31 17033.44 28984.74 (1463.94)2nd Revision 11912.30 17033.4428945.74

(748.11)

6

Project Period

• As per Original PP: July 2006 to June 2009

• As per 1st Revision: July 2006 to June 2011

• As per 2nd Revision: July 2006 to June 2011

7

Major Scope of Works(IP Backbone)

Construction of IP backbone network connecting various important cities of Bangladesh. Total 62 IP PoPs has ben constructed

Construction of a high capacity optical transport network, as IP based services are bandwidth hungry. Total 49 Transmission nodes (DWDM & MSPP) has been installed.

Construction of more than 1450 km optical transmission networks for connecting Khulna, Barisal and Sylhet Divisional cities and some important district cities. Out of which 300 km in EDCF loan and rest are in GoB fund.

8

Major Scope of Works(Access Networks)

• PON based optical Access networks is being built in 4 exchanges (Moghbazar, Central, Gulshan and SB Nagar) of Dhaka city

• ADSL based Access networks for about 24,000 subscribers in 74 nodes has been built for rendering ADSL service over the existing copper cable networks in 32 districts and 4 upazilas.

• Besides, it will be possible to provide IP bandwidth directly from the PoPs for medium and big subscribers through IP switch.

• More than 100 km optical access network has also been constructed to connect different government offices, educational institutions and important locations.

1. IP Network

1.1 Overview

II. Network Design

INFO-BAHAN project applies the IP/MPLS technology as a national data

backbone network for the benefits of IP/MPLS as follows; MPLS is a high-performance packet forwarding technology that integrates the

performance and traffic management capabilities of data link layer (Layer-2) switching with the scalability, flexibility and performance of network-layer (Layer-3) routing.

Next generation IP backbone network services such as all IP and BcN network service are based on IP/MPLS technology.

MPLS enables service providers to meet challenges brought about by explosive growth and provides the opportunity for differentiated services without necessitating the sacrifice of existing infrastructure.

MPLS blends the intelligence of routing with the performance of switching, enabling service providers to extend the capabilities of IP to large-scale VPN implementations. So, using MPLS, VPNs have become much easier to deploy and scale.

9

1.2 Routing Protocol Design

1) OSPF design

Deploy the OSPF(Open Shortest Path First) routing protocol as an IGP for

IP/MPLS network

• OSPF can be easily used for MPLS-TE(Traffic Engineering) if necessary

To consider the BTCL’s administrative divisions and traffic patterns, new IP/MPLS

network is going to have 7 OSPF areas

To accordance with the standard recommendation and experiences, less than 25

IP router

nodes is going to be grouped into one OSPF area

• Dhaka division has 2 OSPF areas

• Khulna division include Barisal will be combined into one OSPF area

For simplicity for network topology, OSPF backbone area is the same as IP/MPLS

core domain

II. Network Design

10

OSPF Area

II. Network Design

OSPF Area IP Nodes

Backbone Area(Area 0)

• Center node layer- IR (Interconnect balancing core network router)- CR (Core router)- VG(MPLS VPN Internet Gateway)

• 6 area border routers

Moghbazar Area(Area 1)

• Dhaka division• Moghbazar, Comilla, Sherebanglanagar, Mohakhali, Uttara, Sayedabad, Savar, Tongi, DEPZ, Tangail, Gazipur, Mymensingh, Jamalpur, Sherpur, Narshingdi and Bhoirab

Central Area(Area 2)

• Dhaka division• Dhaka Central, Nilkhet, Mirpur, Fakirapoul, Gandaria, Narayanganj, Chawkbazar, Babubazar, Khilgaon, Banashri, Dhaka Cantonment, Gulshan1, Baridhara and Bashundhara

Chittagong Area(Area 3)

• Chittagong division• Chittagong, Cox’s Bazar Exchange, Muradpur, Kalurghat, Sagorika, Feni, Agrabad, Bayezid, Rangamati and CEPZ

Khalishpur Area(Area 4)

• Khulna & Barisal division• Khalishpur, Faridpur, Barisal, Jhalokathi, Jessore, Khulna Central, Satkhira, Gopalganj, Madaripur, Magura, Bagerhat and Kushitia

Sylhet Area(Area 5)

• Sylhet division• Sylhet, Brahman Baria and Moulavibazar

Bogra Area(Area 6)

• Rajshahi division• Rajshahi, Bogra, Rangpur, Dinajipur and Pabna

11

2) MPLS Design

Deploy the MPLS enabled IP network as an all IP converged network for various services Deploy the proven system in the carrier class network considering the stability for the development of

new services MPLS network is consisted of 2 layers, MPLS core and MPLS edge layer

II. Network Design

MPLS Layer Node Link

MPLS Core• CR(Core Router)• Division border node

• STM-16 POS, N*GE• Full mesh / Dual link

MPLS Edge

• IR(Interconnect balancing core network Router)• VG(MPLS VPN Internet Gateway)• Regional station node, Access edge node

• GE• Star topology

MPLS core layer•MPLS P(Provider) router function•MPLS core layers is the same as OSPF backbone area

(IR and VG are in the MPLS edge layer)•For the stability of the MPLS network, STM-16 POS interface and redundant link routes are set•IR & CR will have full mesh link

12

MPLS edge layer

• MPLS PE(Provider Edge) router function• MPLS label is imposed and exposed at this layer• Considering the efficient use of the existing transmission network, dark fiber based GE interface and

star topology is deployed• Deploy MPLS VPN Internet gateway for MPLS VPN service stability• Support high-density LAN and WAN interface for the MPLS VPN services(from N*DS0 to GE)• Support transport layer 2 frame over MPLS(L-2 protocol)

II. Network Design

13

II. Network Design

MoghbazarPOP

BograKhalishpur SylhetChittagong

CR1 CR2

1R1 IR2

Moghbazar Div

Central Div

MA1 CA1

CentralPOP

IIG s/w(Balancing Core Network)

PE

MPLS Core

MPLS Edge

IP/MPLSenabled

MPLScore

PE MPLS Edge

CE

L/LHDLC

PE

IP/MPLSenabled

CE

L/LATM

PE

IP/MPLSenabled

CE

L/LF/R

PE

IP/MPLSenabled

CE

L/LPPP

PE

IP/MPLSenabled

CE

L/LHDLC

PE

IP/MPLSenabled

CE

L/LHDLC

PE

VPN 1 VPN 1

MPLS VPN

MPLS network diagram

14

PE

MPLS VPN Internet G/W VG

NIX s/w(Balancing Core Network)

2) Node design

II. Network Design

Classification Site Major Function

Center Node Moghbazar, Dhaka Central • Interconnecting with balancing core network• Internet gateway for MPLS VPN user • EBGP speaker with global Internet and ISPs

Division Border Node

Moghbazar, Dhaka Central, Bogra, Khalishpur, Sylhet and Chittagong

• OSPF backbone ABR router• Interconnecting with CR in center node• Direct connection of ADSL(DSLAM) and/or L/L Internet users(CE-router)

Regional station Node

Uttara, Gulshan, Kilgaon, Chawkbazar, Bayezid, Murad-pur, Agrabad, Mymensingh and Barisal

• OSPF inner router or ASBR router• Interconnecting with division border and/or access edge router• Aggregation of access edge router• Direct connection of ADSL(DSLAM) or L/L Internet users(CE-router)

Access Edge Node

Moghbazar Area(14) ; Mo-hakhali, Tangail, Gazipur, Savar, Tongi, DEPZ, Comilla, Sayedabad, Sherebanglanagar, Sherpur, Jamalpur, Narshingdi and Bhoirab

• OSPF inner router or ASBR router• Direct connection of ADSL(DSLAM) or L/L Internet users(CE-router)

Layered architecture, 4 types of nodes

15

II. Network Design

Classification Site Major Function

Access Edge Node

Central Area(10); Nilkhet, Mir-pur, Fakirapoul, Gandaria, Narayanganj, Babubazar, Ba-nashri, Bashundhara, Baridhara and Dhaka Cantonment

Chittagong Area(6); Cox’sBazar Exchange, Kalurghat,Sagorika, Rangamati, CEPZ andFeni

Khalishpur Area(9); Faridpur, Jessore, Khulna Central, Bager-hat, Gopalganj, Madaripur, Magura, Satkhira and Kushitia

Sylhet Area(2); Brahman Baria and Moulavibazar

Bogra Area(4); Rajshahi, Rang-pur, Dinajipur and Pabna

• OSPF inner router or ASBR router• Direct connection of ADSL(DSLAM) or L/L Internet users(CE-router)

Layered architecture, 4 types of nodes(cont’d)

16

Center node

II. Network Design

MoghbazarPOP

Balancing core network(Existing)

IR1 IR2

CR2CR1

• Site : Moghbazar, Dhaka central• Router’s function

- IP/MPLS P router group(CR1, CR2), PE router group(IR1,IR2)

- IP/MPLS VPN Internet gateway(VG)

- OSPF backbone area• Uplink peer

- Interconnecting with balancing core network(IR1, IR2)- Global Internet traffic : existing GIX(s8512)- National Internet traffic : New NIX

• Downlink peer

- Interconnection with each division’s OSPF ABR router(CR1,CR2)

- No user connection interface• Network equipment’s specification

- IP/MPLS enable

- High speed packet forwarding performance

S8512

: STM-16 POS (DWDM)

: STM-16 POS

: n * GE

: GE

17

VG

GIXNIX

Division border node

• Site : Moghbazar, Dhaka Central, Bogra, Khalishpur, Sylhet and Chittagong

• Router’s function- IP/MPLS P or PE router group- OSPF backbone ABR router - Aggregation of each division’s OSPF area inner router

• Uplink peer - Interconnecting with CR in center node

• Downlink peer - Aggregation of regional station node and access edge node- ADSL(DSLAM) or L/L Internet users connection(CE-router) for

local users

• For fault tolerant service, dual uplink connection • Network equipment’s specification

- IP/MPLS enable - High speed packet forwarding performance

CR1 CR2

MA1Local PoP

Network

L/LDSLAMInternet Users

: STM-16 POS (DWDM)

: STM-16 POS

: n * GE

: GE

II. Network Design

18

Regional station node

• Site : Most of PoPs which have IP child pop such as Khilgaon• Router’s function

- IP/MPLS P or PE router group

- OSPF inner router• Uplink peer

- Interconnecting with division border router• Downlink peer

- Aggregation of one or more access edge router- ADSL(DSLAM) or L/L Internet users connection(CE-router) for

local users• Network equipment’s specification

- IP/MPLS enable

- Serial Interface for L/L service (n*64)

Khilgaon

MA1

Local PoP

Network

L/LDSLAMBanashri

Internet Users

Moghbazar

: STM-16 POS (DWDM)

: STM-16 POS

: n * GE

: GE

II. Network Design

19

Access edge node

• Site : Most of PoPs which have not IP child pop such as Mirpur• Router’s function

- IP/MPLS PE router group

- OSPF inner router or ASBR router• Uplink peer

- Interconnecting with regional station router

- Interconnecting with division border router• Downlink peer

- ADSL(DSLAM) or L/L Internet users connection(CE-router) for local

users• Network equipment’s specification

- IP/MPLS Feature enable

- Serial Interface for L/L service (n*64 )

Central

Local PoP

Network

L/LDSLAM

Mirpur

Internet Users

CA1

: STM-16 POS (DWDM)

: STM-16 POS

: n * GE

: GE

II. Network Design

20

21

IP PoPs & Access Nodes

• Total no. of IP PoPs (Router/Switch) : 63

• Total no. of ADSL Access nodes: 74

• Total ADSL ports: 24,000

22

IP & ADSL (Dhaka division)

• Total no. of IP PoPs: 31 (Out of 31 PoPs, 20 are in Dhaka city)

• Total no. of ADSL nodes: 31

ADSL ports (Subscribers): 14,700 (Out of 30 ADSL nodes, 21 are in Dhaka city)

23

MA

POS(D)

CR1 CR2POS(D)

Uttara

EMS

S8508

S6502

5 GE(Sx)

Existing Switch

5 GE(Sx)

POS(D)

POS (D.F)

1GE(M)

1GE(M)

6 GE(Sx)

Existing Switch

Existing Switch

Existing Switch

Existing Switch

Existing Switch

Savar

Gazipur

Boardbazar Shalna

1GE (D.F)

Mohakhali-M/WComilla

Existing Switch

Sayedabad

Existing Switch

Mymensignh

Tangail

Moghbazar Area

3GE(local)

S6502

S3552

DEPZ

S3552

Tongi

S3552

S6502

1GE(M) 1GE(M) 1GE(M)

S3552

S.B.N

1GE (D.F)

1GE (D.F) 1GE

(D.F)1GE (D.F)

1GE (D.F)

2 GE(Sx)

Gazipur-TSC

Mogh-bazar

1GE(M @ Mohakhali-ITX)

D-38

D-18 D-17 , Savar

D-18

D-20

D-41 D-39 D-40

D-16

Info-Bahan IP Network

1,2

9,10

11,12

3,4

IP & Access Network

Bhoirab

S3552

Narshingdi

S3552

Sherpor

Jamalpur

24

CA

POS(D)

CR1 CR2POS(D)

Nilkhet

EMS

S8508

5 GE(Sx)

Existing Switch

3 GE(Sx)

POS(D)

POS (D.F)

1GE(M)

1GE(M)

MirpurDhaka Cant.ChawkbazarNarayanganj

Gan-daria

Dhaka Central Area

3GE(local)

S6502

Gulshan1Fakirapoul

1GE(M)

Existing Switch

Baridhara Bashundara

1GE(D.F)

6 GE(Sx)

Existing Switch

S8508

S3552 S8508

Banashri

Existing Switch

1GE(D.F)

S3552

Existing Switch

S3552

Existing Switch

Pagla

S3552

2 GE(Sx)Demra

Existing Switch

3 GE(Sx)

S3552Existing Switch

3 GE(Sx)

Goran Mugda Mohanagar

Khilgaon

Siddhirgonj

ZinjiraLalbaghBahubazar

1GE(D.F) 1GE(M)1GE(M) 1GE(M

)

1GE(D.F)

1GE(D.F)

1GE(D.F)

1GE(D.F)

1GE(D.F)

1GE(D.F)

Dhaka Central

D-33

D-32

D-31

D-36 D-37

, Dhaka Cent.D-4

D-8 D-10 D-9 D-11 D-12

D-6

D-28

, Baridhara

D-28

D-29


D-7

7,8

9,10

5,65,8 5,6 3,4

9,10

5,6

10,113,4 7,8 3,4 4,5

9,10

5,6

IP & Access Network

25

IP & ADSL (Chittagong division)• Total no. of IP PoPs: 10 (Out of 10 PoPs, 7 are in Chittagong city)


ADSL ports (Subscribers): 3,450

(Out of 15 ADSL nodes, 11 are in Chittagong city)

26

POS(D)

CR1 CR2POS(D)

SagorikaAgrabad

EMS

2 GE(Sx)

ExistingSwitch

2 GE(Sx)

1GE(D.F)1GE (D.F)1GE(BTCL)

Existing Switch

1GE (D.F)

BayezidMuradpurCox’s Ex.

Chittagong Area

S6502

S3552

S3552

POS(D)

1GE(D.F)1GE (D.F)

Feni

1GE(BTCL)

2 GE(Sx)

S3552

1GE (D.F)

S3552

1GE(BTCL)

S3552S3552

1GE (D.F)1GE (D.F)

S3552

Rangamati CTG Univ.

Noahkhari

CEPZ Guptakhal SilimpurPahartaliKalurghat

1GE (D.F)

1GE (D.F)

2 GE(Sx)

1GE (D.F)

Chittagong Central

C-13

Choumoni

C-14

C-2

C-4

C-3

C-6

, Agrabad

C-3

C-8

C-2

, Muradpur

C-10C-7

C-7CEPZ,C-9

, HathazariC-11

C-12C-5

C-16C-17

C-18


Legend

Patch node

New cableBy BTCL

New cableBy KT

Existing cable

BTCL Transmission

7,8

7,8

9,10 19,20

11,12

5,69,10

21,22

3,4

5,6

7,8

7,8

15,16

5,6

IP & Access Network

27

IP & ADSL (Khulna & Barisal divisions)

• Total no. of IP PoPs: 13


ADSL ports (Subscribers): 3,100

28

POS(M)

CR1 CR2POS(D)

EMS

2 GE(Sx)

2 GE(Sx)

1GE(D.F)1GE (D.F)

1GE(M)

Existing Switch

KushitiaFarid-pur

Khalishpur Area (Khulna)

S6502

S3552

POS(M)

1GE(M)

1GE (M)

POS(M)

S3552

1GE (D.F)

S8508

Chandmari

Daulatpur Jhenaidah

Existing Switch

Existing Switch

1GE(M)

S8508

JessoreKhulna CntBarisal

Khalishpur

K-8

K-12K-12


K-7

Legend

Patch node

New cableBy BTCL

New cableBy KT

Existing cable

BTCL Transmission

7,910,11

IP & Access Network

Gopalganj

S3552

Bagerhat

S3552

Jhalokathi

S3552

Madaripur

S3552

Magura

S3552

Satkhira

S3552

Noapara

1GE(M)

1GE(M)

1GE(M)1GE(M)

1GE(M)

1GE (D.F)

1GE (D.F)

29

IP & ADSL (Rajshahi & Rangpur divisions)



• ADSL ports (Subscribers): 1,800

30

POS(M)

CR1 CR2POS(D)

EMS

Dinajipur

Bogra Area

POS(M)

1GE(BTCL )

S3552S3552

Sirajganj

S3552 ExistingSwitch

S8508

Rajshahi

Existing Switch

1GE(D.F)

1GE(D.F)

ShalbaganTalaimari

2 GE(Sx)

Bogra EX

R-16 R-15

R-13 R-14


R-12

1GE(M to Bogra M/W)

100Mbps(BTCL )

R-12

POS(M to Bogra M/W)

R-12 R-12

R-12 R-12

Pabna

R-12

Rangpur

1GE(M to Bogra M/W)1GE(M to Bogra M/W)

Legend

Patch node

New cableBy BTCL

New cableBy KT

Existing cable

BTCL Transmission

7,8 3,4

IP & Access Network

Sayedpur

1GE(M) Ishwardi

1GE(DF)

31

IP & ADSL (Sylhet division)



• ADSL ports (Subscribers): 900

32

POS(M)

CR1 CR2POS(D)

EMS

ExistingSwitch

2 GE(Sx)

1GE(D.F)

1GE(M)

B. BariaMoulavibazar

Sylhet Area

S6502

POS(M)

1GE(M)

1GE (M)

S3552S3552

Shibganj Habiganj

1GE(D.F)

Shahparan Alampur

Sylhet Central

,

S-6

S-6

S-7

Shibganj


S-8

Legend

Patch node

New cableBy BTCL

New cableBy KT

Existing cable

BTCL Transmission

5,6 8,9 1,2

1GE(D.F)

IP & Access Network

33

IP PoPs & ADSL Nodes Summary

Region IP Pops ADSLNo. of Nodes ADSL Ports

Dhaka 31 nos. 31 14,700 nos.

Chittagong 10 nos. 15 nos. 3,450 nos.

Sylhet 03 nos. 06 nos. 900 nos.

Rajshahi & Rangpur

06 nos.

08 nos. 1,800 nos.

Khulna &Barisal

13 nos. 13 nos. 3,100 nos.

Total= 63 nos. 74 nos. 24,000 nos.

3434

Chittagong15 site

Overall IP Backbone back bone Network dia-gram

CR1 CR2

IIG S/WNIX S/W

IR1 IR23GE(local)

VG

NOC Firewall

WEB Mail NMS DNS OSS EMS Monitor

3GE(local)

Firewall

NOC

Moghbazar

MA

19 siteDhaka Central

CA

22 siteKhalishpur

16 siteSylhet7 sites

Bogra11 site

nxGE

2.5G POS

Type-A Router

Type-B Router

Type-C Router

DSLAM

Metro Switch

GE-PON

Legend

2GE(local)

1GE(local)

POS(D)

POS(D)

3GE(local)POS(M) POS(D) POS(M)

1G(M)

3GE(local)

POS(D) 3GE(local)

2GE(local)

1GE(local)

POS(D)

1GE(local)

POS(D)POS(D)

POS(M) POS(M) POS(M)

POS(M)

35

ADSL Network Design

6 B-RAS(Broadband-Remote Access Server) are to be installed in each division border node

(Moghbazar, Dhaka Central, Chittagong, Sylhet, Bogra and Khalishpur)

ADSL PPP session should be established from ADSL CPE to BRAS based on layer 2 connection

• PPPoE(from DSLAM to router) and EoMPLS(from router to BRAS)

Deploy the EoMPLS VPN between DSLAM and BRAS

• Transparent packet forwarding without any change over PPPoE packet header

• Each DSLAM node have a point-to-point EoMPLS virtual circuit based on VLAN ID

• Division border router have multipoint EoMPLS virtual circuit based on VLAN ID

• B-RAS need to support 802.1q and multiple IP address over IP interface

II. Network Design

36

EoMPLS VPN VC for ADSL network

BRAS

EoMPLS

• Labeled IP packet

• No header change of PPPoE packet

L2 PPPoE

Router

Router

Router

Router

IP/MPLS

PPPoE frame flow

EoMPLS VPN virtual leased line

L2 PPPoE

II. Network Design

BrahmanBaria

MaulaviBazar

Sylhet

Habiganj

Comilla

Mymensingh

Gazipur

Tangail

Bogra

Sirajganj Modhupur

Jhenaidah

Jessore

Kushtia

Pabna

Khulna (Khalishpur)

Shahzadpur

Magura

Faridpur

Madaripur

Barisal

Palashbari

Rangpur

Chittagong

Feni

Regenerator(Feni)

Regenerator (Comilla)

Dhaka(Moghbazar 1)

Uttara

Jessore M/W

DaulatpurExchange

Ishward

Brahman M/WExchange

Transmission Network

Bagerhat Gopalganj

Legend

DWDMSystem

Regenerator for DWDM

MSPP with small DWDM

MSPP (STM-64 Link)

Patch in node

MSPP(STM-16 Link)

Regenerator(Chittagong)

Cox’s Bazar

Narshingdi

Satkhira

Sharsha Regenerator(Chakaria)

Regenerator(Chakaria)

Sherpur

Rajbarii

Sayedpur Dinajpur

Annex. 1B

Munshiganj

Chadpur

Sreemongal

Kishorganj

Joypurhat

Naogaon

Jhikorgacha Narail

Pirojpur

Bhairab

Haziganj

Kachua

Babuganj

Gaurnadi

Sreepur

38

DWDM Ring with

STM-64 MSPP

STM-64MSPP Ring D-1

D-2D-2

D-3

D-4

D-5

D-9

D-12

D-13

D-14

D-21

D-22D-24

D-25

D-26

D-27

D-30D-32D-34

D-35

Info-Bahan Transmission Network

Moghbazar 2 Mohakhali-ITX

Gulshan 1

Banasri

Khilgaon

MugdaparaSayedabad

Chawkbazar

Nilkhet

SBN

Dhaka Cent.

Mirpur Dhaka Cantonment

PM-Office

SBN

Dhaka Central

Sayedabad

PaglaGandaria Narayanganj

Legend

New DWDMSystem

Regenerator for DWDM

New MSPP with small DWDM

New MSPP (STM-64 Link)

Patch node

New cableBy BTCL

New cableBy KT

SBN PM-OfficeMohakhali-M/W

D-24 D-21 D-22 D-38D-15

1,2

3,4

1,2

9,10

3,4

5,67,8

3,4 3,41,2

17.18

D-17,8 5,6

11,129,103,4

1,2

7,8

9,10

7,8

5,6

1,2,3,4

DWDM & STM-64 MSPP Network Diagram (Dhaka City)

39

Sl No. Name of the link Distance (Km) No. of Fiber Remark

1 Kushtia-Jhenaidaha 49 24 DPA

2 Jhenaidaha-Magura 29 24 DPA

3 Magura-Jessore 47 24 DPA

4 Jessore-Khulna 52 24 DPA

5 Khulna-Bagerhat 47 24 DPA

6 Bagerhat-Gopalganj 60 24 DPA

7 Tongi-Narshingdi 42 24 DPA

8 Magura-Faridpur 56 24 GoB

9 Faridpur-Madaripur 79 24 GoB

10 Madaripur-Barisal 78 24 GoB

11 B. Baria-Habiganj 89 24 GoB

12 Habiganj-Maulavibazar 92 24 GoB

13 Maulavibazar-Sylhet 68 24 GoB

14 Bogra-Joypurhat 60 24 GoB

15 Bogra-Naogaon 65 24 GoB

16 Comilla-Chadpur 72 24 GoB

17 Mymensingh-Kishorganj 73 24 GoB

18 Jessore-Narail 38 24 GoB

19 Jessore-Jhikorgacha 18 24 GoB

20 Jhikorgache-Sharsha 19 24 GoB

21 Sharsha-Benapol 8 24 GoB

22 Bagerhat-Pirojpur 29 24 GoB

23 Faridpur-Rajbari 33 24 GoB

24 Bhoirab-B. Baria 30 24 GoB

25 Maulavibazar-Sreemongal 23 24 GoB

26 Sreepur-Munshiganj 24 24 GoB

27 Gopalganj-Tungipara 18 24 GoB

28 Gopalganj-Kotalipara 19 24 GoB

29 Magura-Sreepur 19 24 GoB

30 Sirajganj-Hatikamrul 21 24 GoB

31 Narail-Lohagarah 20 24 GoB

32 Barisal-Babuganj 20 6 GoB

33 Babuganj-Gaurnadi 28 6 GoB

34 Chadpur-Haziganj 6 GoB

35 Haziganj-Kochua 6 GoB

Info-bahan OFC Links

40

1.6 NOC(Network Operation Center)

1) Overview NOC has been installed at the Moghbazar center to monitor overall IP/MPLS network status and

detect any fault of links or network equipments • Location : 4th floor at Moghbazar center• Space : 40 feet * 40 feet• O&M staffs : 8 persons

Management server

Classification Components Feature

IP/MPLSNetwork servers

NMS(Network Management Server)Monitor IP/MPLS network statusGathering traffic statistics per link or protocol

NTP(Network Time Protocol) Server Synchronize the time between network equipments

OSS(Operating Support System)Syslog, TACAS+, TFTPSystem management tool of network equipment

Route server BGP routing information management

Looking glass Search BGP routing status between ISPs

Internet ServerDNS DNS service

Web mail server Web mail service for ADSL subscribers(2Tera Byte)

Network Monitor Network monitor( 40” * 4) Display overall IP/MPLS network and NMS’s information

II. Network Design

41

2) NOC network diagram

IR1 IR2

L3

NMS OSS / NTP

RouteServerLookingGlass

DNS

F/W

For fault tolerant service, deployed dual uplink path between IR and L-3 router

Deploy firewall system for information security

: GE: FE

IP/MPLS

AAA1 DB StorageADSL EMS Subscriber

Management

IP/MPLS Server

Network Monitor

L2

IIG SW

WebMail

Existing ADSL Server

NIX SW

II. Network Design

42

1.7 IP/MPLS Service

1) Overview

IP/MPLS Network MA1

CA1

BograKhalishpur

Sylhet

Chittagong

CR1CR2

Dhaka Central

Moghbazar

Rajshahi

RangpurKushitia Barisal

B.Baria

Gulshan1

IR1

IR2

Muradpur

Feni

Internet

Virtual Leased Line

L3 VPN

Internet Access

IP/MPLS service can be developed based on the categories as follows

• Internet access service

• Virtual leased line service(transport layer 2 frame over MPLS L2 VPN)

• L2/L3 VPN services(Silver service)

• L2/L3 VPN services with QoS(Gold service)

• L2/L3 VPN services with QoS and managed network service(Premium service)

II. Network Design

43

2) IP/MPLS VPN service model

Silver service(Intranet + Internet)

Router

F/W

Router

WEB/MAIL Server

Headquarter

Branch Office 1 ( LAN )


InternetMPLSVPNG/W

PEPE

PE

CECE

CE 1

2

1

2

Separate Internet connection via Headquarter

Internet connection via VPN G/W

Intranet

Internet

User LAN

• Network-based L-2 / L-3 VPN service• Intranet service for enterprise customers • Internet connection can be provided via customer headquarters' Internet line or service provider

VPN gateway service• QoS service level : Best effort• Customer need to prepare security solution by itself

II. Network Design

44

Gold service(Silver service + QoS)

Router

F/W

Router

WEB/MAIL Server

Headquarter



InternetMPLSVPNG/W

PEPE

PE

CECE

CE 1

User LAN

• Silver service + QoS service• Classification of data traffic based on CoS(Class of Service)

1 Classification and remarking DSCP or IP Precedence fieldbased on Class of Service

11

1

II. Network Design

Intranet

Internet

45

Premium service(Gold service + Managed network service)

Router

WEB/MAIL Server

Headquarter



InternetMPLSVPNG/W

PEPE

PE

CE

CE

CE

1 Managed Security Value-added Service• Threat intelligence and event collaboration

• Effective risk analysis and operational control• Managed Firewall service

• Industry-standard stateful inspection firewall technology ensures a secure perimeter to

customer network

1

Firewall need to be installed for service’s scalability and stability

User LAN

• Gold service + managed network service• Monitoring network traffic in detail and analyzing network problem• Security service (Firewall, IDS)

II. Network Design

Intranet

Internet

46

Metro Ethernet

1) Overview

As a high bandwidth access network, Metro Ethernet (ME) is deployed.• ME node will be located in Dhaka division which has high bandwidth users• 7 ME node and about 500 100Mbps access ports can be supported for large

subscribers• 43 ME nodes and about 1,032 100Mbps access ports can be supported for SMB (Small

Medium Business) subscribers• Basic interface to the user will be FE interface• FE FX interface accommodate the long distance users by optical cable.• Support the on demand bandwidth by rate limit solution less than the 1Mbps• Large ME switch has the 96 ports FX• SMB ME switch has at least 24 ports FX and expandable up to 48 ports

Deploy IP/MPLS L3 switch to expand the MPLS PE function to the ME switch (Type E)• Terminate VLAN broadcast domain at the ME switch• Support the IP/MPLS VPN services to users.• IP/MPLS VPN services can be beneficial to the users which have national wide

branches.

Deploy L2 switch to provide VLAN based internet connection (Type F)

VLAN solution is used to distinguish the users on the UNI (User Network Interface) port.• Assign unique VLAN-ID per ME switch.• Reuse of the VLAN-ID on the other ME switch• OSPF routing based MPLS is configured on the uplink interface.

II. Network Design

47

MoghbazarPOP

CR1 CR2

1R1 IR2

Moghbazar

DivCentral DivMA1 CA1

CentralPOP

IIG s/w(Balancing core network)

3 GE 3 GE

2 GE 2 GE

Sherebanglanagar Gulshan1

Kamal Atatark

: STM-16 POS (DWDM) : STM-16 POS

: n * GE

: GE

Metro Ethernet Network Diagram

Pantha Path Ave. IDB

Bangladesh Bank WAPDA

Gulshan2

circle

Secretariat

VLAN per port

10 3020 40

OSPF

Area 1

OSPF

Area 2

VLAN per port

VLAN per port

10 3020 40 10 3020 40 10 3020 40

10 3020 40 10 3020 4010 3020 40

47

VG

NIX s/w(Balancing core network)

2 GE2 GE

GE PON network diagram

II. Network Design

48

49

GPON OLT 1:32

Opt Splitter

ONT/ONU

ONT/ONU

ONT/ONU

GE to IP N/W

STM-1/E1 to PSTN/ PLMN N/W

FE/ POTs/ E1s

Central Office

Customer Premises

OFC Network

GPON Network Diagram

5050

2) Design consideration

Adapts multiple ways of ADSL/ADSL2/ADSL2+ to serve wide Broadband.

For easy management

• Use of the built-in splitter type DSLAM

• Apply independent MDF for DSLAM

Classification Bandwidth Distance (max.) AWG

ADSL 8M/640k 4.5km #26AWG (0.4mm)

ADSL 2 12M/800K 4.5km #26AWG (0.4mm)

ADSL 2+ 24M/800K 4.5km #26AWG (0.4mm)

II. Network Design ADSL

3) ADSL network configurationLayered architecture

• NOC; centralized management system• B-RAS node; PPP session termination and relay the service• DSLAM node; provide the connection to users

II. Network Design

51

Dhaka Central-16 nodes,

Chittagong Division- 15 nodes,

Khulna Division- 13 nodes,

Sylhet Division- 6 nodes,

Bogra Division- 8nodes,

MPLS / IP network

B-RAS B-RAS B-RAS B-RAS B-RASB-RAS

Moghbazer- 12 nodes,

AAADB Storage

New EMS

Subscriber Management

Existing system

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EoMPLS VPN VC for ADSL networkPPPoE Frame

EoMPLS VPN Virtual Leased Line

DSLAM

L2 PPPoE

IP/MPLS VPNLabeled IP packet

No changed PPPoE header

L2 PPPoE

BRAS

Access

II. Network Design

AAADB Storage

New EMS

Subscriber Management

Existing system

• Explanation of authentication & billing flow

① B-RAS requests authentication to AAA when user tries to connect.

② AAA checks the user authentication

if success, proceeding to , if fail, disconnect the user request.③

③ B-RAS sends accounting signal to AAA server.

④ AAA responds to the B-RAS

⑤ B-RAS sends service termination signal to AAA when user terminates the service.

⑥ AAA responds to the B-RAS

• Authentication & billing data flow of RADIUS(PAP)

Authentication procedure

PC client running PPPoE

Access

①① ②

②

③ ④ ⑤ ⑥

BRASInternet

L2 termination and L3 forwardingRadius client for user authentication, accounting and IP

address assignment

II. Network Design

53

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Services to be provided Broadband Internet Access (128 kbps and more)

Point to point VPN service (Regular, Gold, Premium)

Point to multi point VPN service (Regular, Gold, Premium)

Triple play service (BB Internet, voice and video in one line)

Presently available IP based services and future IP services like IP TV, E-commerce, E-governance, Interactive remote education, VoD etc.

Project Overview “ Internet Information Network Expansion (Info-Bahan) Project” Bangladesh...

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