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NGNNGN

Next Generation NetworkNext Generation Network

Prepared byPrepared byAsha SAsha S

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What is current generation network

Why Next Generation networks required

What is NGN ?

Architecture of NGN

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What is current generation

network ?

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Three Kinds of CGN

PSTN

PLMN voice services with wireless access

Data Network Internet

Data network is built up of routers, which are

responsible for forwarding information from one end to

other.Switching Technology implemented is Packet switching.

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TodaySeparate Service Networks

Separate Access Transport & Switching Networks

INET

otherData

/IPNetworks

INET

otherData

/IPNetworks

PLMN

PLMN

PSTN/ISDN

PSTN/ISDN

Services

Current Scenario

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NGN Vision

Next Generation Network is the framework

where operator will have a common transport

network based on packet switching for

providing all kinds of telecommunication

services.

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Gateways

Internet

Wireless Telephone

System

W ork s tati on

Integrated

Services

Over IP

W ork s tati on

Evolving towards IP Communications

Next Generation Networks (NGN)Present Day Networks

Next generation networks

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NGN

NGN refers to the convergence of

different telecom services.

i.e. voice, data and video over a unifiedpacket network utilizing IP.

Packet switching and transport elements

are routers, switches and gateways . In case of BSNL MPLS edge routers and

core-routes constitute the core network.

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FEATURES OF NGN

Packet-based network

Very High-Speed Network from access to

core

Centralized Control

Open Interfaces

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NGN :Definition (As per ITU)

NGN is a packet based network which is

able to provide multimedia telecom

services and able to make use of multiple

broadband, QoS enabled transport

technologies in which service related

functions are independent from underlying

transport related technologies.

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Interfaces

Switching

Call Control Call Server

IP/MPLS

Gateways

Central Office

SwitchNGN Components

NGN Concept w.r.t. Voice Services

Common IP MPLS Transport

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Managem

ent

NGN Architecture

Control

Service

Transport

Access

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//NGN

Architecture

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MPLS

Multi Protocol Label Switching

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What is MPLS ?How does it work ?

Forwards packets based on Labels

Packets are switched based on labels

(IP address is not used at all)

Data path followed through the network is defined

by the transition in label values. Such a path is

called a Label Switched Path LSP

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MPLS

S0 S1

N

D

P

3

2

1

Routing Information Base

Receive Logic TransmitLogic

Input port Output port

Forwarding Information Base

Layer 2.5MPLS

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MPLS Data Encapsulation

Data

DataH4

Application

TPT Layer

NW Layer

Data Link

MPLS

H3 DataH4

SHIM H3 DataH4

H2 T2SHIM H3 DataH4

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Terminologies in MPLS

LSP

LSR

Ingress LSR

Egress LSR

Transit LSR

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LSR

New Delhiew Delhi

Mumbaiumbai

LSPSP

LSRSR

LSRSR

LSRSRLSRSR

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MPLS enabled router is called label Switching

Router

Forwards MPLS packets using label-switching

Executes one or more IP routing protocols

Participates in MPLS control protocols

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SananFranciscorancisco

LSPSP

IngressngressLSRSR TransitransitLSRSR TransitransitLSRSR

EgressgressLSRSR

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MPLS Label Assignment/Binding

LSR-A LSR-B

Assign label

Label assigned

DataData

Control

Data

Control

Upstream Node Downstream Node

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Label Request

10.0.0.0

MPLS Label Assignment/Binding

UpstreampstreamLDP peerDP peer DownstreamownstreamLDP peerDP peerSRSR3

Net: 10.0.0.0et: 10.0.0.0Label: 52abel: 52

(3 , 29 )

Net: 10.0.0.0et: 10.0.0.0Label: 29abel: 29

MPLS TablePLS TableIn Out

(2 , 52 )

MPLS TablePLS TableIn Out

(1 , 17 )

MPLS TablePLS TableIn Out

(5 , 52 )Receiveeceiveoutgoingutgoinglabelabel4, 17 )

Net: 10.0.0.0et: 10.0.0.0Label: 17abel: 17

Advertisedvertiseincomingncominglabelabel(3 , 35 )

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Label Pushing

S0 S1

N

D

P

3

2

1

Routing Information Base

Receive Logic TransmitLogic

Input port Output port

Forwarding Information Base

MPLS

IngressNode

DH4H3H2 T2

DH4H3

101001001 11S

DH4H3H2 T2S

DH4H3S

101001001 11

DH4H3

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Label Swapping

S0 S1

N

D

P

3

2

1

Routing Information Base

Receive Logic TransmitLogic

Input port Output port

Forwarding Information Base

MPLS

TransitNode

101001001 11S

DH4H3S

101001001 11S

DH4H3H2 T2S

DH4H3S

DH4H3H2 T2S

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Label Popping

S0 S1

N

D

P

3

2

1

Routing Information Base

Receive Logic TransmitLogic

Input port Output port

Forwarding Information Base

MPLS

EgressNode

DH4H3H2 T2S

101001001 11

DH4H3H2 T2

101001001 11S

DH4H3

DH4H3S

DH4H3

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LSR Operation

Each LSR maintains a connection table

Port 1

Port 3

Port 2

Port 4

Connection Tableonnection TableIn(port, label) Out(port, label)

(1, 22)(1, 24)(1, 25)(2, 23)

(2, 17)(3, 17)(4, 19)(3, 12)

LabelOperationSwapSwapSwapSwap

25P

19P

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1 2ngress Routing Tablengress Routing TableDes ti na ti on Nex t Hop134.5/16

200.3.2/24(2, 84)(3, 99)

MPLS TablePLS TableIn Out(2, 84) (6, 0)

MPLS TablePLS TableIn Out

(1, 99) (2, 56)MPLS TablePLS Table

In Out(3, 56) (5, 0)

3 5

23

2 6 134.5.1.534.5.1.5

200.3.2.700.3.2.700.3.2.100.3.2.1

134.5.6.134.5.6.1

DestinationEgress Routing Tablegress Routing TableNext Hop134.5/16

200.3.2/24134.5.6.1200.3.2.1

200.3.2.7

MPLS Forwarding Example

200.3.2.799900 . 3 . 2 . 7 000 . 3 . 2 . 7

200.3.2.756600 . 3 . 2 . 7

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MPLS Applications

There are 3 major MPLS applications

currently being implemented

Traffic Engineering

Virtual Private Network

Internet QoS