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1485 Views 5 Replies Latest reply: Dec 17, 2012 4:30 PM by Paul Stewart - CCIE Security RSS

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What Trunking port Does?

Mar 22, 2013 2:19 PM

Bart 234 posts since
Nov 18, 2012

I was told to setup trunk for vlan x on which bunch of AP's was connected to.  According to cisco documents trunking ports allows vlans to talk to each other.  I don't undertand how this could be related to AP's? In common sense why do I need to trunk ports on vlan x(where aps are) to have it working?  any ideas?

  • Justin G 14 posts since
    Aug 20, 2009
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    1. Dec 6, 2012 8:46 PM (in response to Bart)
    Re: What Trunking port Does?

    I’m not sure on the context on which you were requested to create the trunk, but a trunk provides a means to carry multiple VLANs across a single network link.


    With this in mind, it’s not un-common to set the interconnections to WAPs as trunks as multiple ssid’s may be defined on the WAP, all corresponding to different VLANs. Don’t forget the management VLAN as the BVI ip address may be within another VLAN.


    I’m just guessing, but was the request to add VLANx into the allowed list across the link existing WAPs?

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  • Jared 5,546 posts since
    Jul 27, 2008
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    2. Dec 6, 2012 8:58 PM (in response to Bart)
    Re: What Trunking port Does?

    Trunking ports don't allow vlans to talk to each other.  That is the job of a layer 3 device.  A trunk port would allow multiple vlans on a single port Justin stated.


    If you have an autonomous AP that has multiple SSIDs, Each of those SSIDs would map to a different vlan.  The AP has only one ethernet interface so you would need to configure it as a trunk port so all of the different vlans would pass from the AP to the switch.

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  • Paul Stewart  -  CCIE Security 7,568 posts since
    Jul 18, 2008
    Currently Being Moderated
    5. Dec 17, 2012 4:30 PM (in response to Bart)
    Re: What Trunking port Does?

    The normal recommendation from Cisco is to trunk down to autonomous AP's and create access ports for Lightweight AP's. The reason for the recommendation is so multiple SSIDs can be used and mapped to different VLANs. If all of your wireless clients have the same need, one SSID can be used and the switchport can be an access port. Lightweight AP's do it differently. Basically, all of the traffic is tunneled back to the controller. HTH.

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