CS 457 – Lecture 8 Switching and Forwarding
CS 457 ? Lecture 8 Switching and Forwarding
Fall 2011
Course So Far
? Can communicate over a point to point link
? Encode bits on the wire (NRZ, Manchester, etc) ? Make frames (header + data) ? Check for errors (CRC, parity bits) ? Reliably retransmit any lost or corrupt packets
? Can communicate over multi-access
? Shared wire (Ethernet) ? Shared wireless (Wi-Fi)
? But Internet is clearly not a single Ethernet or single Wi-Fi network...
Switches and Forwarding
Switches: Traffic Isolation
? Switch breaks subnet into LAN segments ? Switch filters packets
? Frame only forwarded to the necessary segments ? Segments become separate collision domains ? Bridge: a switch that connects two LAN segments
?switch/bridge
?collision domain
?hu
?hub
?hub
b
?collision domain ?collision domain
Motivation For Self Learning
? Switches forward frames selectively
? Forward frames only on segments that need them
? Switch table
? Maps destination MAC address to outgoing interface
? Goal: construct the switch table automatically
?B!
?A!
?
C!
?switch
? D!
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