11_Metro_Eth_spring10

11_Metro_Eth_spring10 - Metro Ethernet TCP/IP Essentials...

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TCP/IP Essentials EL5373 Supplement Topic EL5373 Supplement Topic Metro Ethernet Metro Ethernet Spring 2010
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Polytechnic Institute of NYU Slide 2 zjzhao Ethernet serves as a Service Bearer Technology for higher-layer applications Many deployment in LAN environment for various IP applications TDM Leased Line ATM/FR connection TDM ATM/FR Transport Ethernet Ethernet Transport MPLS/IP What is Ethernet? Today Ethernet means at least two more distinct things An End-User Service, such as Ethernet private line or Ethernet VPN An Underlying Transport-Network Infrastructure as “Carrier Ethernet”
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Polytechnic Institute of NYU Slide 3 zjzhao A Brief History Ethernet originally developed at Xerox PARC 2.94 Mbps over coaxial cable based on CSMA/CD, 1972 – 1977 Later standardized by DEC, Intel, and Xerox, a.k.a. DIX Ethernet, in 1982 IEEE’s version of CSMA/CD standard 802.3 in 1985 Interoperates with 802.2 (LLC) as higher layer Uses different encapsulation header to carry data payload Traditionally Ethernet = IEEE Standard 802.3 but often marketed as “Ethernet” because it is so popular and pervasive Ethernet related standards in IEEE 802 family for LANs and WANs 802.1 defines Interface to Higher Layers, e.g. 802.1d for MAC Bridging and STP, 802.1Q/p for VLAN ID and Priority Tagging, … 802.2 specifies Logical Link Control 802.3 defines Ethernet and continues to standardize Ethernet services with amendments: e.g. 802.3x for Flow Control, 802.3z for GbE, 802.3ae for 10GbE, 802.3ad for Link Aggregation, …
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Polytechnic Institute of NYU Slide 4 zjzhao Ethernet: Then • Coaxial, Cat5/6 Cable •Bus • Single Domain • Bridges • Spanning Tree Bridge Bridge Bridge
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Polytechnic Institute of NYU Slide 5 zjzhao Ethernet: Now •Fiber •Switch-based •Star and Mesh Topologies •Virtual LANs • Multiple Domains •Link Aggregation •VLAN Trunks •Spanning Trees: • RSTP, MSTP, PVST •QoS Switch Switch Switch Switch Switch
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Polytechnic Institute of NYU Slide 6 zjzhao Ethernet Then and Now Fiber optics Coaxial cable Cabling Limited only by physical media characteristics, 40~80+ km extended reach Limited by CSMA/CD propagation time Distance Star (access) Mesh (WAN trunks) Bus LAN Topology Limited only by frame processing and traffic queueing Less than 30% due to collision Utilization 802.1p None Prioritization VLAN controlled logic traffic separation Entire LAN as a single domain Broadcast Domain No Collision on pt-to-pt full duplex links, CSMA/CD usually disabled Yes (CSMA/CD) Collision Full Duplex; 802.1Q VLAN, VPLS for logical traffic separation Half Duplex Transmission 10 Æ 40, 100 Gbps; Link aggregation 10/100 Mbps Bandwidth Now Then Characteristics
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Polytechnic Institute of NYU Slide 7 zjzhao
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11_Metro_Eth_spring10 - Metro Ethernet TCP/IP Essentials...

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