How to trunk 3850 and 3750?

This is using 3 pcs of Cisco catalyst switch 3850-48, forms a stack. A Cisco Catalyst switch 3750 with sfp ports are used as core switch. However, when I tried to form a trunk between 3850 stack and 3750, I failed. Please help to show the correct way to form the trunk in steps. I found some forums state that you have to use etherchannel on top of the trunk, is this true?

thanks in advance.
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MichaelBalackAsked:
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Don JohnstonInstructorCommented:
"Switchport mode trunk" will put the port in trunking mode.  

Etherchannel can be used with trunking ports.
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MichaelBalackAuthor Commented:
For 3850, it is using NM module with 4 SFP ports.
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Don JohnstonInstructorCommented:
Doesn't matter.  Same command regardless of the module.
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MichaelBalackAuthor Commented:
Hi Don,

Please show step by step, with all the commands involved... thanks.
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Don JohnstonInstructorCommented:
with all the commands involved

Do you mean from not even being connected? Do you know how to log in to the switch? Get to privileged mode? Global config mode?
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MichaelBalackAuthor Commented:
Hi Don,

Is connected and managed to logged in, and I know the privileged and config mode. Please show only how to form the trunking on the interface.
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Don JohnstonInstructorCommented:
The command I posted in my first response. Issue that command from interface config mode for the interface that you want to be a trunk.
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MichaelBalackAuthor Commented:
The given command put the link in trunk. However, the gigabit1/1/1 to 4 can not be used. Use TE1/1/1 to 4 instead.
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