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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 used in this chapter, refer to the Command
Note
Reference—Catalyst 4000 Family, Catalyst 2948G, and Catalyst 2980G Switches.
This chapter consists of these sections:
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Understanding How VLAN Trunks Work
These sections describe how VLAN trunks work on the Catalyst enterprise LAN switches:
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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.
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Understanding How VLAN Trunks Work, page 11-1
Default Trunk Configuration, page 11-5
Configuring a Trunk Link, page 11-5
Example VLAN Trunk Configurations, page 11-7
Disabling VLAN 1 on a Trunk Link, page 11-21
Trunking Overview, page 11-1
Trunking Modes and Encapsulation Types, page 11-2
Trunking Support, page 11-4
802.1Q Trunk Restrictions, page 11-4
Software Configuration Guide—Catalyst 4000 Family, Catalyst 2948G, Catalyst 2980G, Releases 6.3 and 6.4
C H A P T E R
Chapter 10, "Configuring VLANs."
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11-1
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