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To create or configure a VLAN trunk on a
Cisco IOS command-based switch, configure the port first as a trunk and
then specify the trunk encapsulation with the following commands:
 Before attempting to configure a VLAN
trunk on a port, determine what encapsulation the port can support. This
can be done using the
show port capabilities
command. In
the example, notice in the highlighted text that Port 2/1 will support
only the IEEE 802.1Q encapsulation.
Verify that trunking has been configured
and verify the settings by using the
show trunk [mod_num/port_num]
command from privileged mode on the switch.

Figure
shows the
trunking modes available in Fast Ethernet and Gigabit Ethernet.
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Lab Activity
Lab Exercise: Trunking with ISL
This lab is to create an ISL trunk line
between the two switches to allow communication between paired
VLANs.
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Lab Activity
Lab Exercise: Trunking with 802.1q
This lab is to create an 802.1q trunk
line between the two switches to allow communication between
paired VLANs.
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Lab Activity
e-Lab Activity: Trunking with ISL
In this lab, the student will create multiple VLANs on two
separate switches, name the switches, and assign multiple member
ports to the switches.
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Lab Activity
e-Lab Activity: Trunking with 802.1q
In this lab, the student will
create multiple VLANs on two separate switches, name the
switches, and assign multiple member ports to the switches.
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