Wireless Access

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Access network design for branch, remote, outdoor and campus locations with Aruba access points, and mobility controllers.
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Add additional VLAN to an existing VAP

  • 1.  Add additional VLAN to an existing VAP

    Posted Sep 24, 2019 02:09 AM

    I have a VAP using a VLAN that has ran out of addresses so I want to add an additional VLAN to the same VAP.

     

    Will anything happen to the devices already connected on the existing VLAN or will new users connecting start taking addresses from the new VLAN and old devices keep running like nothing has changed?

     

    Also, do the VLANs need to have the same mask or can the new subnet be larger?



  • 2.  RE: Add additional VLAN to an existing VAP

    Posted Sep 24, 2019 04:03 AM

    Will anything happen to the devices already connected on the existing VLAN or will new users connecting start taking addresses from the new VLAN and old devices keep running like nothing has changed?

    Nothing will happen to the old devices. They will run as usual.

    However this depends on the way you add vlan.

    Let me explain,

    If you add it as follows

    Wlan virtual-ap <your vap profile>
    Vlan <new vlan>

    This will replace your existing vlan and all the users will get disconnected.

     

    ========================================================

     

    The following method is how it should be done.

    Wlan virtual-ap <your vap profile>
    Vlan <old vlan> , <new vlan>

    The comma is VERY important.

    The size of the new vlan does not matter. It can be larger than the old one.

     

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  • 3.  RE: Add additional VLAN to an existing VAP

    Posted Sep 24, 2019 07:34 PM

    @Mr.RFC wrote:

    Will anything happen to the devices already connected on the existing VLAN or will new users connecting start taking addresses from the new VLAN and old devices keep running like nothing has changed?



     Unfortunately, when you change the the number VLAN(s) in the Virtual AP profile, existing users will be kicked off and re-balanced (pooled) between the two VLANs.  In addition, you want the VLANs to be the same size, because in the act of pooling users between the VLANs, the controller assumes that they are the same size....If one is larger than the other, it will get filled up before the other one, because the controller cannot tell how full they are and is unaware of the size difference.