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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
Info-Bahan IP Network
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)
• Total no. of ADSL nodes: 15
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
Info-Bahan IP Network
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
• Total no. of ADSL nodes: 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
Info-Bahan IP Network
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)
• Total no. of IP PoPs: 6
• Total no. of ADSL nodes: 8
• 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
Info-Bahan IP Network
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)
• Total no. of IP PoPs: 3
• Total no. of ADSL nodes: 6
• 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
Info-Bahan IP Network
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 )
Branch Office 2 ( 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
Branch Office 1 ( LAN )
Branch Office 2 ( LAN )
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
Branch Office 1 ( LAN )
Branch Office 2 ( LAN )
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
52
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
54
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.
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