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Configuring VLAN Trunks on Fast Ethernet and
Gigabit Ethernet Ports
This chapter describes how to configure Fast Ethernet and Gigabit Ethernet virtual LAN (VLAN) trunks
on the Catalyst enterprise LAN switches.
Note
For complete information on configuring VLANs, see
For complete syntax and usage information for the commands that are used in this chapter, refer to the
Note
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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•
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Understanding How VLAN Trunks Work
The following sections describe how VLAN trunks work on the Catalyst enterprise LAN switches.
Trunking Overview
A trunk is a point-to-point link between one or more switch ports and another networking device such
as a router or a switch. Trunks carry the traffic of multiple VLANs over a single link and allow you to
extend VLANs across an entire network.
The Catalyst 4500 series, 2948G, 2948G-GE-TX, and 2980G switches support IEEE 802.1Q—802.1Q
trunking encapsulation.
Catalyst 4500 Series, Catalyst 2948G, Catalyst 2948G-GE-TX, and Catalyst 2980G Switches Software Configuration Guide—Release 8.2GLX
78-15908-01
Understanding How VLAN Trunks Work, page 11-1
Default Trunk Configuration, page 11-5
Configuring a Trunk Link, page 11-5
Disabling VLAN 1 on a Trunk Link, page 11-8
Example VLAN Trunk Configurations, page 11-9
C H A P T E R
Chapter 10, "Configuring VLANs."
11
11-1
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