Wireless Access

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Access network design for branch, remote, outdoor, and campus locations with HPE Aruba Networking access points and mobility controllers.
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Traffic Shaping and Voice

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  • 1.  Traffic Shaping and Voice

    Posted Jan 05, 2015 10:03 PM

    Would this profile have any undesirable effects on the Voice network, assuming almost all the users are Voice and limits are not being hit?

     

    wlan traffic-management-profile "CA-SSID-Priority"
    shaping-policy preferred-access
    bw-alloc virtual-ap "Employee-vap_prof" share 30 enforcement soft
    bw-alloc virtual-ap "POS-vap_prof" share 15 enforcement soft
    bw-alloc virtual-ap "Residence-vap_prof" share 10 enforcement soft
    bw-alloc virtual-ap "Guest-vap_prof" share 5 enforcement soft
    bw-alloc virtual-ap "Voice-vap_prof" share 20 enforcement soft



  • 2.  RE: Traffic Shaping and Voice

    EMPLOYEE
    Posted Jan 06, 2015 05:49 AM

    BGC IT,

     

    Bandwidth shaping seems like a good idea, but in fact it makes troubleshooting more difficult, because it is artificially manipulating the airtime that clients get.  How much of a client's throughput is being limited by bandwidth contracts, a true congestion issue or bandwidth shaping is impossible to tell.  Properly designed VOIP clients will use WMM to automatically prioritize the traffic over the WLAN, so they do not need this mechanism.  Bandwidth shaping was designed primarily for multi-tenant organizations that need to guarantee specific percentages of bandwidth to their tenants, but if the RF side of your WLAN is not optimized, it could end up reducing bandwidth by constraining traffic to what is left of it.  Merely enabling this does not magically fix anything.

     

    I would first attempt to try to fix the RF for all users and then try to narrow down issues to specific clients, instead.

     



  • 3.  RE: Traffic Shaping and Voice

    Posted Jan 06, 2015 10:06 PM

    Thanks for the general thoughts.

     

    Anyone have a specific answer?



  • 4.  RE: Traffic Shaping and Voice

    EMPLOYEE
    Posted Jan 06, 2015 10:09 PM

    The specific answer is that it could have a negative effect, so you should not do it. Voice should work without traffic shaping.  When you use traffic shaping, you end up penalizing the other traffic and that will decrease your average throughput..