Metro/Wide Area Ethernet

Part 1: Review of Ethernet Technologies

Pierre Thiry, CNIT

Part 1: Ethernet: history and new trends (Gbit and 10Gbit Ethernet)

Outline:1. A few historic dates2. What is IEEE 802.3: 10Base , 100Base,

1000Base and 10000Base3. CSMA/CD, Hubs & Switches4. VLAN & Rapid Spanning Tree5. Metro and Wide Area Ethernet

History of Ethernet• invented in 1972 by Bob Metcalfe at Xerox

PARC• DIX Standard first published in 1980• First IEEE 802.3 standard in 1983 (10Base-5)• Fast Ethernet 100Base-TX and –FX in 1995• Gigabit Ethernet in 1998-1999• 10 Gigabit Ethernet in 2002 (803.ae)• Ethernet in the First Mile in 2004 (803.ah)

A drawing of the first Ethernet system by Bob Metcalfe

General Facts about Ethernet

• Frame Format - MAC Addressing• Encoding (Manchester, 4B/5B, 8B/10B)• CSMA/CD (only for half-duplex)

not needed for Gigabit Ethernet and above which work at full-duplex only.

• VLANs tagging IEEE 802.1q12 bits 4096 possible VLANS.

ETHERNET Frame Format

Virtual LANs (VLANS) explained

OSI Model

Ethereal (http://www.ethereal.com)

This is the way WAN and LAN are often introduced

Schematic of a leased line (T1 or T3)

A few good references on Ethernet

• http://www.ethermanage.com/ethernet/ethernet.html

• http://grouper.ieee.org/groups/802/3/• Cisco CCNA 1 modules 6 & 7