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How to trunk 3850 and 3750?

Posted on 2014-10-07
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Last Modified: 2014-10-17
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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Question by:MichaelBalack
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8 Comments
 
LVL 50

Expert Comment

by:Don Johnston
ID: 40366342
"Switchport mode trunk" will put the port in trunking mode.  

Etherchannel can be used with trunking ports.
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Author Comment

by:MichaelBalack
ID: 40366345
For 3850, it is using NM module with 4 SFP ports.
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Expert Comment

by:Don Johnston
ID: 40366380
Doesn't matter.  Same command regardless of the module.
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Author Comment

by:MichaelBalack
ID: 40366387
Hi Don,

Please show step by step, with all the commands involved... thanks.
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Expert Comment

by:Don Johnston
ID: 40366409
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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Author Comment

by:MichaelBalack
ID: 40366488
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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Accepted Solution

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Don Johnston earned 2000 total points
ID: 40366499
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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Author Closing Comment

by:MichaelBalack
ID: 40387943
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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