Project Overview
“ Internet Information Network
Expansion (Info-Bahan) Project”
Bangladesh Telecommunications Company Limited
Completed on: June 30, 2011
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
2
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
3
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
4
Information regarding DPP of the Project
• Project Cost (In lakh Taka):
GoB
DPA
Total
Original PP
1st Revision
2nd Revision
(FE)
10,973.86 17,033.40 28007.3
(2143.94)
11951.31 17033.44 28984.74
(1463.94)
11912.30
17033.44 28945.74
(748.11)
5
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
6
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.
7
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.
8
II. Network Design
1. IP Network
1.1 Overview
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
II. Network Design
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
10
II. Network Design
 OSPF Area
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
II. Network Design
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
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
II. Network Design
 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)
13
II. Network Design
 MPLS network diagram
PE
MPLS VPN Internet G/W
IIG s/w
(Balancing Core Network)
NIX s/w
(Balancing Core Network)
1R1
IR2
PE
CR1
CR2
Central
POP
MPLS Edge
VG
Moghbazar
POP
MPLS
core
MPLS Core
MA1
CA1
Moghbazar
Div
Central Div
Chittagong
Khalishpur
Sylhet
IP/MPLS
enabled
IP/MPLS
enabled
IP/MPLS
enabled
IP/MPLS
enabled
IP/MPLS
enabled
IP/MPLS
enabled
PE
PE
PE
PE
PE
PE
L/L
F/R
L/L
PPP
CE
CE
L/L
HDLC
CE
VPN 1
L/L
ATM
CE
MPLS VPN
VPN 1
14
L/L
HDLC
CE
Bogra
L/L
HDLC
CE
MPLS Edge
II. Network Design
2) Node design
 Layered architecture, 4 types of nodes
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,
Muradpur, 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) ;
Mohakhali, 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)
15
II. Network Design
 Layered architecture, 4 types of nodes(cont’d)
Classification
Access Edge
Node
Site
Major Function
• OSPF inner router or ASBR router
• Direct connection of ADSL(DSLAM) or L/L Internet
users(CE-router)
Central Area(10); Nilkhet,
Mirpur, Fakirapoul, Gandaria,
Narayanganj, Babubazar,
Banashri, Bashundhara,
Baridhara and Dhaka
Cantonment
Chittagong Area(6); Cox’s
Bazar Exchange, Kalurghat,
Sagorika, Rangamati, CEPZ and
Feni
Khalishpur Area(9); Faridpur,
Jessore, Khulna Central,
Bagerhat, Gopalganj, Madaripur,
Magura, Satkhira and Kushitia
Sylhet Area(2); Brahman Baria
and Moulavibazar
Bogra Area(4); Rajshahi,
Rangpur, Dinajipur and Pabna
16
II. Network Design
 Center node
Moghbazar
POP
•
•
Balancing core network
(Existing)
GIX
S8512
NIX
•
IR1
IR2
CR1
CR2
VG
•
: STM-16 POS
(DWDM)
: STM-16 POS
: n * GE
: GE
•
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
17
II. Network Design
 Division border node
CR1
CR2
•
•
MA1
Local PoP
•
Network
DSLAM L/L
Internet Users
•
: STM-16 POS
(DWDM)
: STM-16 POS
: n * GE
: GE
•
•
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
18
II. Network Design
 Regional station node
•
•
Moghbazar
MA1
Khilgaon
•
Local PoP
•
Network
DSLAM L/L
Internet Users
Banashri
: STM-16 POS
(DWDM)
: STM-16 POS
: n * GE
•
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)
: GE
19
II. Network Design
 Access edge node
Central
CA1
Mirpur
Local PoP
•
•
•
•
Network
DSLAM L/L
Internet Users
•
: STM-16 POS
(DWDM)
: STM-16 POS
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 )
: n * GE
: GE
20
IP PoPs & Access Nodes
• Total no. of IP PoPs (Router/Switch) : 63
• Total no. of ADSL Access nodes:
74
• Total ADSL ports:
24,000
21
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)
22
Info-Bahan IP Network
IP & Access Network
Moghbazar Area
CR2
POS(D)
CR1
3GE(local)
Bhoirab
POS(D)
Moghbazar
5 GE(Sx)
S3552
Jamalpur
MA
5 GE(Sx)
S8508
Narshingdi
S6502
S6502
S6502
POS (D.F)
S3552
1GE(M)
D-16
POS(D)
Sherpor
Tangail
Uttara
1GE(M)
Mymensignh Sayedabad
1GE(M)
Comilla
1GE(M)
Mohakhali-M/W
Tongi
Existing
Switch
Existing
Switch
1GE (D.F)
Savar
3,4
Gazipur
6 GE(Sx)
D-18 11,12
1GE (D.F) 1GE (D.F)
D-18 9,10 D-17
Savar
S.B.N
Existing
Switch
1GE(M @ Mohakhali-ITX)
D-38 1,2
S3552
EMS
Existing
Switch
1GE(M)
D-20
DEPZ
1GE (D.F) 1GE (D.F)
D-41
D-39
Gazipur-TSC
1GE (D.F)
D-40
Boardbazar
Shalna
2 GE(Sx)
Existing
Switch
Existing
Switch
Existing
Switch
S3552
Existing
Switch
S3552
S3552
23
Info-Bahan IP Network
IP & Access Network
Dhaka Central Area
CR2
POS(D)
CR1
POS(D)
3GE(local)
Dhaka Central
5 GE(Sx)
CA
3 GE(Sx)
S8508
Gandaria
Demra
S6502
1GE(M)
2 GE(Sx)
7,8
D-33
1GE(D.F)
S3552
1GE(M)
Pagla
Narayanganj
Chawkbazar
9,10
D-32
1GE(D.F)
Existing
Switch
D-31 5,6
1GE(D.F)
1GE(M)
Fakirapoul
1GE(D.F) 1GE(M)
D-7 5,6
1GE(M)
Dhaka Cant.
Khilgaon
POS(D)
1GE(M)
Existing
Switch
1GE(D.F)
5,8
D-36
Bahubazar
S3552
9,10
D-4
5,6
D-37
Lalbagh
Existing
Switch
S3552
1GE(D.F)
10,11
D-10
D-9 3,4 D-11 7,8 D-12 3,4
Banashri
Mohanagar
Mugda
Goran
Dhaka Cent.
3,4
D-8 1GE(D.F)
Zinjira
S3552
POS (D.F)
D-6 5,6
Gulshan1
Mirpur
6 GE(Sx)
S8508
Existing
Switch
Siddhirgonj
EMS
Existing
Switch
Existing
Switch
D-28 9,10
3 GE(Sx)
Existing
Switch
Nilkhet
3 GE(Sx)
Existing
Switch
Baridhara
1GE(D.F)
D-28 4,5 D-29 1GE(D.F)
Baridhara
S3552
Bashundara
S8508
24
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)
25
Info-Bahan IP Network
IP & Access Network
Chittagong Area
Legend
CR2
POS(D)
CR1
Patch node
POS(D)
New cable
By BTCL
POS(D)
Chittagong Central
New cable
By KT
2 GE(Sx)
2 GE(Sx)
Existing cable
S6502
BTCL
Transmission
EMS
C-3
C-16
1GE(BTCL)
C-17
1GE(BTCL)
1GE (D.F)
Feni
Cox’s Ex.
Muradpur
1GE (D.F)
Choumoni
S3552
S3552
1GE (D.F)
1GE (D.F)
C-4
C-5
Kalurghat
2 GE(Sx)
C-7 11,12
CEPZ
Existing
Switch
1GE (D.F) 1GE (D.F)
C-7 9,10
C-9 5,6
CEPZ
1GE(D.F)
C-8 3,4
Agrabad
Pahartali
Existing
Switch
Agrabad
C-3 19,20
2 GE(Sx)
C-13 7,8
1GE(D.F)
1GE (D.F)
C-2 9,10
C-2 7,8
21,22
Muradpur
Sagorika
C-6
7,8
Bayezid
C-11
S3552
Guptakhal
S3552
1GE (D.F)
C-10 5,6
Silimpur
1GE(BTCL)
C-18
Rangamati
15,16
Hathazari
1GE (D.F)
C-12
C-14 7,8
Noahkhari
S3552
S3552
S3552
5,6
CTG Univ.
26
IP & ADSL (Khulna & Barisal divisions)
• Total no. of IP PoPs:
13
• Total no. of ADSL nodes:
13
ADSL ports (Subscribers):
3,100
27
Info-Bahan IP Network
IP & Access Network
Khalishpur Area (Khulna)
Legend
Patch node
POS(M)
POS(M)
Khalishpur
New cable
By BTCL
2 GE(Sx)
New cable
By KT
Existing cable
CR2
POS(D)
CR1
2 GE(Sx)
1GE(M)
S6502
Gopalganj
EMS
BTCL
Transmission
S8508
1GE(M)
POS(M)
S3552
1GE(M)
1GE (M)
1GE (D.F) 1GE(M)
1GE(D.F)
K-8
Satkhira
Barisal
Faridpur
Kushitia
S3552
Existing
Switch
1GE (D.F)
Jhalokathi
S8508
1GE (D.F)
10,11 K-12 K-12 7,9
Chandmari
S3552
Khulna Cnt
Jessore
Existing
Switch
Existing
Switch
1GE(M)
1GE(M)
Madaripur
1GE(M)
K-7
Daulatpur Jhenaidah
1GE(M)
1GE (D.F)
Bagerhat
Magura
Noapara
S3552
S3552
S3552
S3552
S3552
28
IP & ADSL (Rajshahi & Rangpur divisions)
• Total no. of IP PoPs:
6
• Total no. of ADSL nodes:
8
• ADSL ports (Subscribers):
1,800
29
Info-Bahan IP Network
IP & Access Network
Bogra Area
Legend
CR2
POS(D)
CR1
POS(M)
Patch node
POS(M)
POS(M to Bogra M/W)
R-12
New cable
By BTCL
Bogra EX
R-12
New cable
By KT
EMS
Existing cable
S3552
BTCL
Transmission
R-12
R-12
1GE(M to Bogra M/W)
R-12
R-12
R-16 1GE(BTCL )
Pabna
Dinajipur
S3552
1GE(M to Bogra M/W)
R-15 100Mbps(BTCL )
Rangpur
Rajshahi
Sirajganj
Existing
Switch
2 GE(Sx)
S3552
R-12
1GE(M to Bogra M/W)
Existing
Switch
S8508
1GE(D.F)
1GE(DF)
1GE(M)
Ishwardi
Sayedpur
R-13 7,8
Talaimari
1GE(D.F)
R-14 3,4
Shalbagan
30
IP & ADSL (Sylhet division)
• Total no. of IP PoPs:
3
• Total no. of ADSL nodes:
6
• ADSL ports (Subscribers):
900
31
Info-Bahan IP Network
IP & Access Network
Sylhet Area
Legend
Patch node
CR2
POS(D)
CR1
POS(M)
POS(M)
Sylhet Central
New cable
By BTCL
New cable
By KT
2 GE(Sx)
S6502
Existing cable
EMS
BTCL
Transmission
Existing
Switch
S-6
Shibganj
1GE(M)
Moulavibazar
S3552
1GE (M)
B. Baria
1GE(D.F)
1GE(D.F) 1GE(D.F) 1GE(M)
S-8 5,6
S-7 8,9
S-6 1,2
Shahparan
Alampur
Shibganj
Habiganj
S3552
32
IP PoPs & ADSL Nodes Summary
Region
IP Pops
ADSL
No. 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
Khulna &
Barisal
Total=
06 nos.
08 nos.
1,800 nos.
13 nos.
13 nos.
3,100 nos.
63 nos.
74 nos.
24,000 nos.
33
Overall IP Backbone back bone Network diagram
NIX S/W
Legend
IIG S/W
NOC
nxGE
2.5G POS
1GE(local)
NOC Firewall
2GE(local)
Type-A Router
2GE(local)
Type-B Router
3GE(local)
IR1
Firewall
1GE(local)
IR2
POS(D)
3GE(local)
3GE(local)
WEB Mail NMS DNS OSS
EMS Monitor
VG
Type-C Router
DSLAM
POS(D)
Metro Switch
1GE(local)
1G(M)
CR1
GE-PON
CR2
POS(D)
POS(D)
3GE(local)
MA
19 site
Moghbazar
POS(D)
POS(M)
3GE(local) POS(D) POS(M) POS(M)
POS(M)
POS(D)
POS(M)
POS(M)
CA
22 site
Dhaka Central
15 site
Chittagong
16 site
Khalishpur
7 sites
Sylhet
11 site
Bogra
34
34
II. Network Design
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
35
•
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
EoMPLS VPN VC for ADSL network
BRAS
L2 PPPoE
Router
EoMPLS
•Labeled IP packet
•No header change of PPPoE packet
IP/MPLS
Router
Router
Router
L2 PPPoE
PPPoE frame flow
EoMPLS VPN virtual leased line
36
Annex. 1B
Transmission Network
Rangpur
Kishorganj
Sylhet
Palashbari
Joypurhat
Sirajganj
Modhupur
Tangail
Mymensingh
Maulavi
Bazar
Bogra
Naogaon
Narshingdi
Sayedpur
Dinajpur Shahzadpur
Sreemongal
Bhairab
Sherpur
Habiganj
Legend
MSPP
(STM-16 Link)
Pabna
Gazipur
Ishward
DWDM
System
Uttara
Sreepur
Kushtia
Regenerator
for DWDM
Munshiganj
Faridpur
MSPP with
small DWDM
MSPP
(STM-64 Link)
Patch in node
Jhenaidah
Magura
Jhikorgacha
Satkhira
Haziganj
Chadpur
Feni
Regenerator
(Comilla)
Regenerator
(Feni)
Regenerator
(Chittagong)
Pirojpur
Barisal
Chittagong
Babuganj
Sharsha
Khulna
(Khalishpur)
Brahman M/W
Exchange
Comilla
Gaurnadi
Narail
Jessore M/W
Daulatpur
Exchange
Kachua
Dhaka
(Moghbazar 1)
Rajbarii
Madaripur
Jessore
Brahman
Baria
Regenerator
(Chakaria)
Regenerator
(Chakaria)
Bagerhat
Gopalganj
Cox’s Bazar
Info-Bahan Transmission Network
DWDM & STM-64 MSPP Network Diagram (Dhaka City)
Mirpur
Dhaka Cantonment
Moghbazar 2
1,2,3,4
D-24
5,6
Legend
New DWDM
System
Regenerator
for DWDM
SBN
D-22
D-22
1,2
D-14
3,4
D-15
PM-Office
SBN
3,4
D-38
Mohakhali-M/W
D-27 1,2
PM-Office
D-25 7,8
D-21
D-5 17.18
Gulshan 1
Nilkhet
SBN
New MSPP with
small DWDM
New MSPP
(STM-64 Link)
D-21
D-24
Mohakhali-ITX
STM-64
MSPP Ring
D-35 9,10
7,8
D-1
D-1 5,6
DWDM Ring
with
STM-64 MSPP
D-26 3,4
Banasri
D-12 1,2
Patch node
Chawkbazar
Dhaka Central
New cable
By BTCL
Khilgaon
D-4 7,8
New cable
By KT
7,8
D-2
D-2 5,6
Dhaka Cent.
Sayedabad
D-9 9,10
D-3 1,2
3,4
D-34
Gandaria
9,10
D-32
Pagla
11,12
D-30
Narayanganj
3,4
D-13
Sayedabad
Mugdapara
38
Info-bahan OFC Links
Sl No.
No. of Fiber
Remark
1
Name of the link
Kushtia-Jhenaidaha
Distance (Km)
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
39
II. Network Design
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
IP/MPLS
Network servers
Components
Feature
NMS(Network Management Server)
Monitor IP/MPLS network status
Gathering traffic statistics per link or protocol
NTP(Network Time Protocol) Server
Synchronize the time between network equipments
OSS(Operating Support System)
Syslog, TACAS+, TFTP
System management tool of network equipment
Route server
BGP routing information management
Looking glass
Search BGP routing status between ISPs
DNS
DNS service
Web mail server
Web mail service for ADSL subscribers(2Tera Byte)
Network monitor( 40” * 4)
Display overall IP/MPLS network and NMS’s information
Internet Server
Network Monitor
40
II. Network Design
2) NOC network diagram
 For fault tolerant service, deployed dual uplink path between IR and L-3 router
 Deploy firewall system for information security
RouteServer
LookingGlass
: GE
: FE
IP/MPLS
IIG SW
Network Monitor
NIX SW
IR2
IR1
L3
F/W
L2
Existing ADSL
Server
IP/MPLS Server
WebMail
NMS
OSS / NTP
DNS
ADSL EMS
41
AAA1
DB
Storage
Subscriber
Management
II. Network Design
1.7 IP/MPLS Service
1) Overview
 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)
Internet
IR1
Gulshan1
IR2
Virtual Leased Line
CR1
Dhaka Central
CR2
Muradpur
CA1
MA1
Feni
Chittagong
IP/MPLS Network
Moghbazar
Sylhet
Internet Access
Khalishpur
Bogra
L3 VPN
Rajshahi
B.Baria
Kushitia
Rangpur
Barisal
42
II. Network Design
2) IP/MPLS VPN service model
 Silver service(Intranet + Internet)
• 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
WEB/MAIL Server
F/W
User LAN
Router
Router
CE Headquarter
PE
Intranet
1
Internet
2
Internet
MPLS
VPN
G/W
PE
PE
CE
CE
Branch Office 1
( LAN )
Branch Office 2
( LAN )
43
1
Separate Internet connection via Headquarter
2
Internet connection via VPN G/W
II. Network Design
 Gold service(Silver service + QoS)
• Silver service + QoS service
• Classification of data traffic based on CoS(Class of Service)
WEB/MAIL Server
F/W
Intranet
User LAN
Router
Router
Headquarter
CE
Internet
1
1
PE
Internet
MPLS
VPN
G/W
PE
PE
1
CE
1
Classification and remarking DSCP or IP Precedence field
based on Class of Service
1
CE
Branch Office 1
( LAN )
Branch Office 2
( LAN )
44
II. Network Design
 Premium service(Gold service + Managed network service)
• Gold service + managed network service
• Monitoring network traffic in detail and analyzing network problem
• Security service (Firewall, IDS)
WEB/MAIL Server
User LAN
Router
CE
Headquarter
Intranet
Internet
PE
1
Internet
MPLS
VPN
G/W
PE
PE
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
CE
CE
Branch Office 1
( LAN )
Branch Office 2
( LAN )
Firewall need to be installed for service’s scalability and stability
45
II. Network Design
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.
46
Metro Ethernet Network Diagram
: STM-16 POS
(DWDM)
NIX s/w
IIG s/w
(Balancing core network)
(Balancing core network)
2 GE
2 GE
2 GE
2 GE
: STM-16 POS
: n * GE
: GE
1R1
IR2
CR1
CR2
VG
Moghbazar
POP
3 GE
MA1
Central
POP
3 GE
Moghbazar
CA1
Central Div
Div
OSPF
OSPF
Area 2
Area 1
Bangladesh Bank
WAPDA
Sherebanglanagar
Secretariat
Gulshan1
Pantha Path Ave.
IDB
10 20 30 40
10 20 30 40 10 20 30 40
Kamal Atatark
Gulshan2
circle
10 20 30 40
10 20 30 40
VLAN per port
VLAN per port
10 20 30 40
10 20 30 40
VLAN per port
47
47
II. Network Design
GE PON network diagram
48
ONT/ONU
GE to
IP N/W
STM-1/E1
to PSTN/
PLMN N/W
GPON
OLT
FE/
POTs/
E1s
1:32
Opt Splitter
OFC
Network
Central
Office
ONT/ONU
ONT/ONU
Customer
Premises
GPON Network Diagram
49
II. Network Design ADSL
2) Design consideration
Adapts multiple ways of ADSL/ADSL2/ADSL2+ to serve wide Broadband.
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)
For easy management
•Use of the built-in splitter type DSLAM
•Apply independent MDF for DSLAM
50
50
II. Network Design
3) ADSL network configuration
Layered architecture
• NOC; centralized management system
• B-RAS node; PPP session termination and relay the service
• DSLAM node; provide the connection to users
AAA
DB
Storage
Subscriber
Management
New EMS
Existing
system
MPLS / IP network
B-RAS
Dhaka Central
-16 nodes,
51
B-RAS
Moghbazer
-12 nodes,
B-RAS
Chittagong Division
-15 nodes,
B-RAS
Khulna Division
-13 nodes,
B-RAS
B-RAS
Sylhet Division Bogra Division
-8nodes,
-6 nodes,
II. Network Design
EoMPLS VPN VC for ADSL network
AAA
DB
Storage
PPPoE Frame
EoMPLS VPN Virtual Leased Line
Subscriber
Management
New EMS
Existing
system
BRAS
L2
PPPoE
IP/MPLS VPN
Labeled IP packet
No changed PPPoE
header
Access
L2
PPPoE
DSLAM
52
II. Network Design
Authentication procedure
•
Authentication & billing data flow of RADIUS(PAP)
L2 termination and L3 forwarding
Radius client for user authentication, accounting and IP
address assignment
①
② ③④
⑤⑥
①
②
Access
BRAS
Internet
PC client
running PPPoE
•
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 ③, if fail, disconnect the user request.
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
53
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.
54