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

2. Metro Ethernet Networks Typically covers several hundred miles of concentrated metropolitan areas Typically covers several hundred miles of concentrated metropolitan areas Explosion of Internet traffic and IP services demand for rapid scalability and dynamic functionality Explosion of Internet traffic and IP services demand for rapid scalability and dynamic functionality

3. SONET/SDH Implementation  Metro core and metro access ring topology  ADM  DACS  TDM

4. SONET/SDH Constraints Complex, multi-tiered, hierarchical network Complex, multi-tiered, hierarchical network Limited Scalability Limited Scalability Expensive Expensive

5. Metro Ethernet Networks Service and operational cost reduced Service and operational cost reduced Scalable – up to 100Gbps Scalable – up to 100Gbps Simple – fewer protocol conversion Simple – fewer protocol conversion

6. Services Provided by MEN Full suite of carrier-class Ethernet services Full suite of carrier-class Ethernet services Ethernet switching Ethernet switching Statistical multiplexing functionality Statistical multiplexing functionality Bandwidth-on-demand service Bandwidth-on-demand service

7. Metro Ethernet Network Advantages Service and management Service and management Scalability Scalability Network Reliability Network Reliability Co-existence with existing infrastructure Co-existence with existing infrastructure Topological flexibility Topological flexibility Reduction in operational and network costs Reduction in operational and network costs

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

9. Questions?