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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Link Aggregation on AP220

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  • 1.  Link Aggregation on AP220

    Posted Mar 03, 2014 06:12 PM

    In planning for a deploy of a large number of AP22xs, I am trying to determine if there is a real benefit to running 2 ethernet cables to each WAP. My understanding is that 1 port will be used for 2.4Ghz and the other for 5Ghz, if a single link goes down with that channels traffic failover to the remaining link?   How complex is the configuration, to accomplish this, and how much complexity does it add to troubleshooting?  Do the real world benefits justify its implementation?   Thanks 



  • 2.  RE: Link Aggregation on AP220
    Best Answer

    Posted Mar 03, 2014 06:14 PM

    It uses the GRE striping IP to send traffic for one radio down the other link (via port-channel IP load balancing).


    On top of speed, you are also gaining redundancy. You can create your LACP groups across stacks and if a stack member dies, your APs will stay up.


     For us, the benefit is the redundancy, not the bundled speed.


    Note that currently there is no PoE redundancy. If the switch that is providing the power were to die or reload, the AP would reboot.

  • 3.  RE: Link Aggregation on AP220

    Posted Mar 03, 2014 06:41 PM

    thanks that is super helpful, in the case the switch providing PoE dies, will the AP reboot and use PoE from the other switch or just fail?



  • 4.  RE: Link Aggregation on AP220

    Posted Mar 03, 2014 06:43 PM
    I think it should reboot and negotiate power from the other switchport. I’ll let someone from Aruba confirm that though.

  • 5.  RE: Link Aggregation on AP220

    Posted Mar 03, 2014 06:47 PM
    Tim is correct. The AP will drop when the PoE sourcing switch goes down but then will power up via the secondary connection.