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Chapter 11
Configuring VLANs
Configuring a Trunk Port
Beginning in privileged EXEC mode, follow these steps to configure a port as a trunk port:
Command
Step 1
configure terminal
Step 2
interface interface-id
Step 3
switchport trunk encapsulation {isl |
dot1q | negotiate}
Step 4
switchport mode {dynamic {auto |
desirable} | trunk}
Step 5
switchport access vlan vlan-id
Step 6
switchport trunk native vlan vlan-id
Step 7
end
Step 8
show interfaces interface-id switchport Display the switchport configuration of the interface in the Administrative
Step 9
show interfaces interface-id trunk
Step 10
copy running-config startup-config
To return an interface to its default configuration, use the default interface interface-id interface
configuration command. To reset all trunking characteristics of a trunking interface to the defaults, use
the no switchport trunk interface configuration command. To disable trunking, use the switchport
mode access interface configuration command to configure the port as a static-access port.
This example shows how to configure a port as an IEEE 802.1Q trunk. The example assumes that the
neighbor interface is configured to support IEEE 802.1Q trunking.
Switch# configure terminal
Enter configuration commands, one per line.
Switch(config)# interface gigabitethernet0/2
Switch(config-if)# switchport mode dynamic desirable
Switch(config-if)# switchport trunk encapsulation dot1q
Switch(config-if)# end
OL-8915-03
Purpose
Enter global configuration mode.
Specify the port to be configured for trunking, and enter interface
configuration mode.
Configure the port to support ISL or IEEE 802.1Q encapsulation or to
negotiate (the default) with the neighboring interface for encapsulation
type.
You must configure each end of the link with the same encapsulation type.
Configure the interface as a Layer 2 trunk (required only if the interface
is a Layer 2 access port or tunnel port or to specify the trunking mode).
dynamic auto—Set the interface to a trunk link if the neighboring
•
interface is set to trunk or desirable mode. This is the default.
dynamic desirable—Set the interface to a trunk link if the
•
neighboring interface is set to trunk, desirable, or auto mode.
trunk—Set the interface in permanent trunking mode and negotiate
•
to convert the link to a trunk link even if the neighboring interface is
not a trunk interface.
(Optional) Specify the default VLAN, which is used if the interface stops
trunking.
Specify the native VLAN for IEEE 802.1Q trunks.
Return to privileged EXEC mode.
Mode and the Administrative Trunking Encapsulation fields of the
display.
Display the trunk configuration of the interface.
(Optional) Save your entries in the configuration file.
End with CNTL/Z.
Cisco Catalyst Blade Switch 3020 for HP Software Configuration Guide
Configuring VLAN Trunks
11-21
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