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Linking cisco 3560 switch and dumb switch

Unanswered Question
Mar 7th, 2014
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I have a training class coming into one of my centers and they require additional users for a single room. I have been instructed to plug an off the shelf Dlink 16 port desktop switch into the onsite Cisco 3560 switch. Can this simply be done by shutting off port security and plugging into the switch or will i need to trunk a port and plug the dlink into that port? Thanks.

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acampbell Fri, 03/07/2014 - 16:53
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Hi Tyrone,

We dont know your detailed setup.

So lets say the the class with the d-link is to use vlan 100

So on your on your 3560 set up an interface just to allow traffic to vlan 100.


int f0/20


desc *** LINK TO D-LINK ***

switchport mode access

switchport access vlan 100

switchport port-security

switchport  port-security max 20

switchport port-security violation shut

no shut


This will set the link to vlan 100

Only allow up to 20 MAC adds from the d-link

Automatically SHUTDOWN the port if more than 20 MACs appear

Also find the info/manual for the correct d-link

something like this


Its your network so make sure you control what is or what is not allowed.

Hope this helps

Please rate useful posts.

Leo Laohoo Fri, 03/07/2014 - 19:57
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