Understanding How Ethernet Works; Ethernet Overview - Cisco WS-C2948G-GE-TX Configuration Manual

Configuring Ethernet and Fast Ethernet Switching
This chapter describes how to configure Ethernet and Fast Ethernet switching on the Catalyst enterprise
LAN switches. The configuration procedures in this chapter apply to Ethernet and Fast Ethernet switch
ports on switching modules and fixed-configuration switches, as well as to supervisor engine
Fast Ethernet uplink ports.
Note For complete information on installing Catalyst 4500 series Fast Ethernet modules, refer to the
Catalyst 4000 Family Installation Guide.
Note For complete syntax and usage information for the commands that are used in this chapter, refer to the
Catalyst 4500 Series, Catalyst 2948G, Catalyst 2948G-GE-TX, and Catalyst 2980G Switches Command
Reference.
This chapter consists of these sections:
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Understanding How Ethernet Works

These sections describe how Ethernet switching works on the Catalyst enterprise LAN switches:
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Ethernet Overview

The Catalyst enterprise LAN switches support simultaneous, parallel conversations between Ethernet
segments. Switched connections between Ethernet segments last only for the duration of the packet. New
connections can be made between different segments for the next packet.
Catalyst 4500 Series, Catalyst 2948G, Catalyst 2948G-GE-TX, and Catalyst 2980G Switches Software Configuration Guide—Release 8.2GLX
78-15908-01
Understanding How Ethernet Works, page 4-1
Default Ethernet and Fast Ethernet Configurations, page 4-2
Configuring Ethernet and Fast Ethernet Ports, page 4-3
Ethernet Overview, page 4-1
Switching Frames Between Segments, page 4-2
Building the Address Table, page 4-2
C H A P T E R
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