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Catalyst 2900 Series XL and Catalyst 3500 Series XL Software Configuration Guide
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Chapter 8 Configuring VLANs
How VLAN Trunks Work
Beginning in privileged EXEC mode, follow these steps to configure a port as an
ISL or 802.1Q trunk port:
Note This software release does not support trunk negotiation through the Dynamic
Trunk Protocol (DTP), formerly known as Dynamic ISL (DISL). If you are
connecting a trunk port to a Catalyst 5000 switch or other DTP device, use the
non-negotiate option on the DTP-capable device so that the switch port does
not generate DTP frames.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
interface interface_id Enter the interface configuration mode and the port to be
configured for trunking.
Step 3
switchport mode trunk Configure the port as a VLAN trunk.
Step 4
switchport trunk
encapsulation {isl | dot1q}
Configure the port to support ISL or 802.1Q encapsulation.
You must configure each end of the link with the same
encapsulation type.
Step 5
end Return to privileged EXEC mode.
Step 6
show interface interface-id
switchport
Verify your entries.
In the display, check the Operational Mode and the
Operational Trunking Encapsulation fields.
Step 7
copy running-config
startup-config
Save the configuration.
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