Metropolitan Ethernet Networks Estella Kang Matt Powers SC441 Computer Networks – Independent Study Boston University

 Typically covers several hundred miles of concentrated metropolitan areas  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

 Full suite of carrier-class Ethernet services  Ethernet switching  Statistical multiplexing functionality  Bandwidth-on-demand service

 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.computer networkEthernetmetropolitan areaaccess networkWide Area NetworkInternetIntranet  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. switchesroutersoptical fibertopologyring hub-and-spokemesh IPMPLS100G  Ethernet on the MAN can be used as  pure Ethernet,  Ethernet over SDH,  Ethernet over MPLS or  Ethernet over DWDMDWDM SM Pengenalan Teknologi dan Jasa Telekomunikasi Semester Ganjil Tahun Ajaran

 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:Metro Ethernet Forum  E-Line also known as Virtual Leased Line and Point-to-Point. E-LineVirtual Leased LinePoint-to-Point  E-LAN also known as Virtual Private LAN Services, Transparent LAN Services and MultiPoint-to-MultiPoint. E-LANVirtual Private LAN ServicesTransparent LAN ServicesMultiPoint-to-MultiPoint SM Pengenalan Teknologi dan Jasa Telekomunikasi Semester Ganjil Tahun Ajaran

 Ethernet Private Line  Dedicated UNIs for Point-to-Point connections MEN Ethernet UNI Point-to-Point EVCs (dedicated BW) CE Ethernet Private Line using E-Line Service type Private Line Analogy to E-Line Service Internet ISP POP Storage SP Ethernet UNI MEN OC-3 DS1 Dedicated TDM circuits CE Internet ISP POP Storage SP DS3 CE

 Ethernet Virtual Private Line  Supports Service Multiplexed UNI  Point-to-Point VPN for site interconnectivity CE MEN Ethernet UNI Service Multiplexed Ethernet UNI Point-to-Point EVCs CE FR CPE MEN FR UNI Point-to-Point FR PVCs Ethernet Virtual Private Line using E-Line Service type Frame Relay Analogy to E-Line Service FR CPE

 Metro core and metro access ring topology  ADM  DACS  TDM

 Complex, multi-tiered, hierarchical network  Limited Scalability  Expensive

 Label switching to forward data by mapping VLAN tags to label switched paths (LSPs)  Load sharing by switching path around bottlenecks to less congested links  Dedicated backup LSP and fast reroute when a connection failure occurs

 Pada kecepatan tinggi IP terlalu komplek.  Pada kecepatan tinggi IP terlalu memakan resource CPU.  Operator perlu teknologi yang effisien.

 Tujuan direct hanya terbatas.  Misalnya Lampung --> Jakarta, Medan, Surabata dan Internet.  Sangat terbatas, tidak banyak tujuan kecuali Internet.  Aplikasi pelanggan juga terbatas.  , web, sekali-sekali video conference.  Perlu customisasi per pelanggan yang mudah.

 Label Switch – jauh lebih sederhana & effisien.  TCP/IP – kompleks & tidak effisien.  Label Switch – jauh lebih baik untuk backbone daripada IP.

 LIB= Label Information Base  LSR= Label Switched Router

 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.