Configuring A Trunk Port - Cisco 3020 - Catalyst Blade Switch Configuration Manual

Configuring VLAN Trunks
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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
Cisco Catalyst Blade Switch 3020 for HP Software Configuration Guide
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STP Port Fast setting.
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trunk status: if one port in a port group ceases to be a trunk, all ports cease to be trunks.
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We recommend that you configure no more than 24 trunk ports in PVST mode and no more than 40
trunk ports in MST mode.
If you try to enable IEEE 802.1x on a trunk port, an error message appears, and IEEE 802.1x is not
enabled. If you try to change the mode of an IEEE 802.1x-enabled port to trunk, the port mode is
not changed.
A port in dynamic mode can negotiate with its neighbor to become a trunk port. If you try to enable
IEEE 802.1x on a dynamic port, an error message appears, and IEEE 802.1x is not enabled. If you
try to change the mode of an IEEE 802.1x-enabled port to dynamic, the port mode is not changed.
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 to specify the trunking mode).
(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.
dynamic auto—Set the interface to a trunk link if the neighboring
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interface is set to trunk or desirable mode. This is the default.
dynamic desirable—Set the interface to a trunk link if the
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neighboring interface is set to trunk, desirable, or auto mode.
trunk—Set the interface in permanent trunking mode and negotiate
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to convert the link to a trunk link even if the neighboring interface is
not a trunk interface.
Chapter 10 Configuring VLANs
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