onfigure a trunk port, perform this task:
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Step 1
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switch# configure terminal
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Enters configuration mode.
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Step 2
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switch(config)# interface { type slot / port | port-channel number }
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Specifies an interface to configure, and enters interface configuration mode.
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Step 3
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switch(config-if)# switchport mode { access | trunk }
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Sets the interface as an Ethernet trunk port. A trunk port can carry traffic in one or more VLANs on the same physical link (VLANs are based on the trunk-allowed VLANs list). By default, a trunk interface can carry traffic for all VLANs. To specify that only certain VLANs are allowed on the specified trunk, use the switchport trunk allowed vlan command.
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This example shows how to set Ethernet 3/1 as an Ethernet trunk port:
switch# configure terminal
switch(config)# interface ethernet 3/1
switch(config-if)# switchport mode trunk