module16-lanswitchingV2

module16-lanswitchingV2 - LAN switching and Bridges Relates...

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1 LAN switching and Bridges Relates to Lab 6. Covers interconnection devices (at different layers) and the difference between LAN switching (bridging) and routing. Then discusses LAN switching, including learning bridge algorithm, transparent bridging, and the spanning tree protocol.
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2 Outline Interconnection devices Bridges/LAN switches vs. Routers Bridges Learning Bridges Transparent bridges
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3 Introduction There are many different devices for interconnecting networks X.25 Network Ethernet Hub Hosts Router Bridge Token- ring Gateway
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4 Ethernet Hub Used to connect hosts to Ethernet LAN and to connect multiple Ethernet LANs Collisions are propagated IP LLC 802.3 MAC IP Hub Ethernet Host
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Bridges/LAN switches We will use the terms bridge and LAN switch (or Ethernet switch in the context of Ethernet) interchangeably. Interconnect multiple LAN, possibly with different type Bridges operate at the Data Link Layer (Layer 2) Bridge IP LLC 802.3 MAC 802.5 MAC IP LAN Token- ring
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6 Ethernet Hubs vs. Ethernet Switches An Ethernet switch is a packet switch for Ethernet frames Buffering of frames prevents collisions. Each port is isolated and builds its own collision domain An Ethernet Hub does not perform buffering: Collisions occur if two frames arrive at the same time. HighSpeed Backplane CSMA/CD CSMA/CD CSMA/CD CSMA/CD CSMA/CD CSMA/CD CSMA/CD CSMA/CD Output Buffers Input Buffers CSMA/CD CSMA/CD CSMA/CD CSMA/CD CSMA/CD CSMA/CD CSMA/CD CSMA/CD Hub Switch
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7 Dual Speed Ethernet hub Dual-speed hubs operate at 10 Mbps and 100 Mbps per second Conceptually these hubs operate like two Ethernet hubs separated by a bridge 100 Mbps 10 Mbps Dual-Speed Ethernet Hub
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8 Routers Routers operate at the Network Layer (Layer 3) Interconnect IP networks IP network Router Host Application TCP IP Network Access Application IP IP protocol Data Link Network IP Network Network IP Network
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9 Gateways The term “Gateway” is used with different meanings in different contexts “Gateway” is a generic term for routers (Level 3) “Gateway” is also used for a device that interconnects different Layer 3 networks and which performs translation of protocols (“Multi-protocol router”) SNA Network IP Network X.25 Gateway Host
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10 Bridges versus Routers An enterprise network (e.g., university network) with a large number of local area networks (LANs) can use routers or bridges 1980s: LANs interconnection via bridges Late 1980s and early 1990s: increasingly use of routers Since mid1990s: LAN switches replace most routers
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11 Internet A Routed Enterprise Network Router Hub FDDI FDDI
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12 Internet A Switched Enterprise Network Router Switch
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13 Example: Univ. of Virginia CS Department Network Design of the network architecture (Spring 2000) There is no router !
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module16-lanswitchingV2 - LAN switching and Bridges Relates...

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