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AP 225 port-channel

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  • 1.  AP 225 port-channel

    Posted Apr 27, 2021 02:53 AM
    Hi, we have a cluster configured with 2 controllers. I want to test the benefit of a port channel configured for one AP 225 model. we are running AOS version 8.5.0.10. The test AP is connected to a Cisco switch.
    Apart from configuring the po on the cisco switch, is there anything to be configured on the controllers ?
    thank you!

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    ioanf
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  • 2.  RE: AP 225 port-channel
    Best Answer

    Posted Apr 28, 2021 12:10 AM
    Hi ioanf,

    I did a blog post about this here:
    https://www.flomain.de/2019/07/lacp-for-aps-with-two-ethernet-ports/

    For a cluster, this is quite easy to implement. The AP will do LACP by default, if the switch is sending LACP BPDU's. The only thing to consider is, that you should use L3 loadbalance for this link aggregation on the switch, as L2 might not work well due to the communication partners of the AP (only the gateway in the VLAN from a l2 point of view, but the different IP's of the cluster members from a L3 point of view)

    Hope this helps.

    BR
    Florian

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    Florian Baaske
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  • 3.  RE: AP 225 port-channel

    Posted May 10, 2021 03:47 PM
    Florian,
    Trying to follow your blog post and understand everything needed to set up LACP on APs. We are running aos 8.7 with two 7240 controllers (MDs) clustered together (along with clustered virtual MMs). 

    1. Since I am running a cluster of two MDs, I do not need to enable "AP LACP Striping IP" ? (as show below which is currently not enabled)

    2. If the above is true, is all that I need to do is on my cisco uplink switch, is join the two switch ports to a port channel?

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    Cody Ensanian
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  • 4.  RE: AP 225 port-channel

    Posted May 12, 2021 01:51 PM
    After some more research I think I was confusing two separate notions. You can 1) join the AP's two switchport interfaces to a port-channel and use LACP to create some redundancy/failover/increase POE/etc between the switch and the AP; and separately you can also 2) enable lacp gre striping on the controllers to help split up the 2.4ghz and 5ghz radio client traffic (this requires another IP on the controllers).

    I'm not sure the later is necessary with two clustered controllers (really seeing any benefit I mean)? Aren't they already doing client load balancing between the controllers in the cluster (without having to enable gre-striping)?

    Another question related to setting up LACP on the switch-to-AP uplinks... since client traffic is tunneled back to my controllers, the traffic source IP is always my AP, and the destination IP is either one of my two controllers (right? since the clients are load balanced - and they may send traffic to either controller)... so, having set my load-balance algorithm on my cisco switch to "src-dst-ip" is that enough to potentially help 'split and load balance' traffic between the two member interfaces of the port channel? Or is all of the traffic coming from the AP still only going to go out one of the member interfaces? (which wont help boost bandwidth, and only helps the AP gain a backup uplink if one interface should fail) Hope that makes sense what I am asking.

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    Cody Ensanian
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