Switching

Switching - Topics Interconnecting LAN segments HUB...

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1 Csci 232 Computer Networks Switching and Forwarding 1 Topics • Interconnecting LAN segments –HU B ( P h y s i c a l L a y e r ) – Bridge (Link layer) – Layer 2 Switch (multi-port bridge, link layer) • Interconnecting networks – Layer 3 Switch (network layer) – Router (network layer) •ATM N e tw o r k s Csci 232 Computer Networks Switching and Forwarding 2 Interconnecting LAN Segments • (Repeating) Hubs (layer 1 devices) • Bridges (layer 2 devices) –B a s i c F u n c t i o n s – Self learning and bridge forwarding table Forwarding/filtering algorithm – Bridge looping problem and spanning tree algorithm • Ethernet Switches – Remark: switches are essentially multi-port bridges. – What we say about bridges also holds for switches! •R e a d i n g s –S e c t i o n 3 . 2 Csci 232 Computer Networks Switching and Forwarding 3 Interconnecting with Hubs • Backbone hub interconnects LAN segments • Extends max distance between nodes • But individual segment collision domains become one large collision domain – if a node in CS and a node EE transmit at same time: collision • Can’t interconnect 10BaseT & 100BaseT
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2 Csci 232 Computer Networks Switching and Forwarding 7 Self Learning •A b r i d g e h a s a bridge (forwarding) table • Entry in bridge forwarding table: – <Node LAN Address, Bridge Interface, Time Stamp> – stale entries in table dropped (TTL can be 60 min) •B r i d g e s learn which hosts can be reached through which interfaces – when frame received, bridge “learns” location of sender: incoming LAN segment – records sender/location pair in bridge forwarding table Csci 232 Computer Networks
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This note was uploaded on 10/25/2009 for the course CS 232 taught by Professor Susan during the Fall '09 term at GWU.

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Switching - Topics Interconnecting LAN segments HUB...

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