Download Metro Ethernet - Blog of FX Ari Wibowo

SC441 Computer Networks – Independent Study
Boston University
Metropolitan
Ethernet
Networks
Estella Kang
Matt Powers
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Typically covers several hundred miles of
concentrated metropolitan areas
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Explosion of Internet traffic and IP services
demand for rapid scalability and dynamic
functionality
Service and operational cost reduced
 Scalable – up to 100Gbps
 Simple – fewer protocol conversion
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Full suite of carrier-class Ethernet services
Ethernet switching
Statistical multiplexing functionality
Bandwidth-on-demand service
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Service and management
Scalability
Network Reliability
Co-existence with existing infrastructure
Topological flexibility
Reduction in operational and network costs
A Metro Ethernet is a computer network based on the Ethernet standard and
which covers a metropolitan area. It is commonly used as a metropolitan access
network to connect subscribers and businesses to a Wide Area Network, such as
the Internet. Large businesses can also use Metro Ethernet to connect branch
offices to their Intranet.
 A typical service provider Metro Ethernet network is a collection of Layer 2 or 3
switches or routers connected through optical fiber. The topology could be a ring,
hub-and-spoke (star), or full or partial mesh. The network will also have a
hierarchy: core, distribution and access. The core in most cases is an existing
IP/MPLS backbone, but may migrate to newer forms of Ethernet Transport in the
form of 10G or 100G speeds.
 Ethernet on the MAN can be used as
 pure Ethernet,
 Ethernet over SDH,
 Ethernet over MPLS or
 Ethernet over DWDM

SM341073
Pengenalan Teknologi dan Jasa Telekomunikasi
Semester Ganjil Tahun Ajaran 2009 - 2010
6
The main advantages of an MPLS-based Metro Ethernet against a pure Ethernet
are:
 Scalability: pure Ethernet MAN are limited to a maximum of 4,096 VLANs for
the whole network, when using MPLS, Ethernet VLANs have local meaning
only (like Frame Relay PVC).
 Resiliency: pure Ethernet network resiliency relies on STP or RSTP (30 to 1 sec
convergence) while MPLS-based MANs use MPLS-based mechanism
 Multiprotocol convergence: with the maturity on pseudowires standards
(ATM VLL, FR VLL, etc.) an MPLS-based Metro Ethernet can backhaul not only
IP/Ethernet traffic but virtually any type of traffic coming from customer
networks or other access networks (i.e. ATM aggregation for UMTS).
 End to End OAM: MPLS-based MAN offers a wider set of troubleshooting
 The Metro Ethernet Forum (MEF) has defined two types of services that can be
delivered through Metro Ethernet:
 E-Line also known as Virtual Leased Line and Point-to-Point.
 E-LAN also known as Virtual Private LAN Services, Transparent LAN Services
and MultiPoint-to-MultiPoint.

SM341073
Pengenalan Teknologi dan Jasa Telekomunikasi
Semester Ganjil Tahun Ajaran 2009 - 2010
7
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Ethernet Private Line

Dedicated UNIs for Point-to-Point connections
Ethernet UNI
Ethernet
UNI
CE
Ethernet
UNI
OC-3
DS1
CE
MEN
Ethernet
UNI
Ethernet Private Line using
E-Line Service type
Internet
CE
MEN
CE
ISP
POP
CE
Storage SP
Dedicated TDM
circuits
Storage SP
Point-to-Point EVCs
(dedicated BW)
ISP
POP
DS3
OC-3
CE
Private Line Analogy to
E-Line Service
Internet

Ethernet Virtual Private Line

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Supports Service Multiplexed UNI
Point-to-Point VPN for site interconnectivity
Point-to-Point
EVCs
Ethernet UNI
Point-to-Point FR
PVCs
Service
Multiplexed
Ethernet UNI
FR
UNI
FR
UNI
CE
MEN
CE
CE
Ethernet
UNI
Ethernet Virtual Private Line
using E-Line Service type
FR CPE
FR CPE
MEN
FR
CPE
FR
UNI
Frame Relay Analogy to
E-Line Service

Metro core and metro access ring
topology
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ADM
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DACS
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TDM
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Complex, multi-tiered, hierarchical network
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Limited Scalability
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Expensive
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Label switching to forward data by mapping
VLAN tags to label switched paths (LSPs)
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Load sharing by switching path around
bottlenecks to less congested links
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Dedicated backup LSP and fast reroute when a
connection failure occurs
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Pada kecepatan tinggi IP terlalu komplek.
Pada kecepatan tinggi IP terlalu memakan
resource CPU.
Operator perlu teknologi yang effisien.
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Tujuan direct hanya terbatas.
 Misalnya Lampung --> Jakarta, Medan, Surabata
dan Internet.
 Sangat terbatas, tidak banyak tujuan kecuali
Internet.
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Aplikasi pelanggan juga terbatas.
 E-mail, web, sekali-sekali video conference.
 Perlu customisasi per pelanggan yang mudah.
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Label Switch – jauh lebih sederhana &
effisien.
TCP/IP – kompleks & tidak effisien.
Label Switch – jauh lebih baik untuk
backbone daripada IP.
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LIB = Label Information Base
LSR = Label Switched Router
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LSR, Label Switched Router – router yang
mampu melakukan switching dengan label.
LIB, Label Information Base – kira-kira tabel
routing label tempat melihat outbound
Interface & label yang digunakan utk
mengirim paket.