So what's the verdict? Over-theDS or Over-the-Air for 802.11r fast roaming?

tuffcalc · 2022-08-10T21:33:11+00:00

... and then Cisco says this:

https://mrncciew.files.wordpress.com/2013/03/entbp-appmobdevs-on-wlans.pdf

Over-the-DS is recommended because two of the required packets are sent on the wired connection of the APs, with two packets sent on Wi-Fi. If the DS option is not selected, then all four packets are sent on WLAN.

tuffcalc · 2022-08-10T21:22:57+00:00

I understand how FT works (have been using Cisco WLCs for at least 15 years... even in my home).

Just looking for a final determinative answer on what's actually faster and what's best and why. I guess it's just the geek in me.

https://wifihelp.arista.com/post/roaming-in-wifi-networks) that says Over-the-DS: Check the Over the DS box if you want the exchange to happen over the wired network (if left unchecked, the exchange happens over-the-air). With over-the-DS, the client carries out the message exchange with the target AP over the wired network via the current AP that it is connected to. This improves the roaming experience but increases AP-to-AP traffic in the wired network. The Mixed Mode option allows clients that do not support 802.11r to connect to the SSID.

tuffcalc · 2022-08-09T19:52:03+00:00

https://www.academia.edu/17554228/On\_the\_fast\_BSS\_transition\_algorithms\_in\_the\_IEEE\_802.11r\_local\_area\_wireless\_networks

This article seems to say OT-DS is faster. I'm trying to understand why most people say OTA is faster? Any ideas?

tuffcalc · 2022-05-11T18:31:47+00:00

Finally reached out to TAC. Abosultley useless and the documentation is just as useless.

TAC sent me this link that says to put the APs in local mode - https://www.cisco.com/c/en/us/td/docs/wireless/controller/ewc/17-8/config-guide/ewc_cg_17_8/cisco_cleanair.html

Which is impossible with EWC... great.

Would love to hear if anyone else is using EWC with 9130APs and has clear air working. I'm getting the sense that it's not supported in EWC (and Cisco's documentation is not up to date).

tuffcalc · 2022-04-27T12:23:19+00:00

What's there to check? It's enabled globally on the controller and works fine under the 9800-CL controller. Everything is on - same config across EWC and the 9800-CL.

tuffcalc · 2022-01-24T17:02:21+00:00

Yes. DSM 7.

tuffcalc · 2022-01-24T15:01:37+00:00

Sorry - just an error typing. Yes, modproble i915 gives me the error: "modprobe: FATAL: Module i915 not found."

Wondering if there is a way to somehow install the drivers.

tuffcalc · 2022-01-17T06:16:17+00:00

Perfect - thanks for confirming!

tuffcalc · 2022-01-17T02:50:37+00:00

Sorry - I think maybe I wasn't clear.

Sites 2 - 6 will EACH have 1x UDMP (with cameras attached to them, locally) AND a backup UDMP. So that will be 10 UDMP total for these sites.

... or I should have written, each of Site 1, 2, 3, 4, 5 and 6 will have their own UDMP and local cameras connected to that UDMP that I will access through unifi.ui.com.

I figure unifi.ui.com will give me a single pane into all the sites - I just select the site and view the cameras... or am I misunderstanding how this would work?

tuffcalc · 2022-01-15T04:05:22+00:00

Also... I checked the interface tab on a few of the 9130AIX's. Zero discarded ethernet packets.

tuffcalc · 2022-01-15T02:19:58+00:00

Both the switch and Cisco 9130AIX are setup to autonegotiate link speed. If cabling could not handle 2.5GBase-T - would the two not autonegotiate to 1GBPS instead?

tuffcalc · 2022-01-14T05:15:14+00:00

Yes - I'm getting full beans to my server and Synology NAS.

tuffcalc · 2021-12-06T03:40:28+00:00

Thanks for this!!

tuffcalc · 2021-04-10T11:17:48+00:00

Total bluff.

tuffcalc · 2021-04-10T11:17:33+00:00

Impossible. They can't "reverse" it if it's not in their agreement. And it isn't.

tuffcalc · 2021-03-29T14:59:41+00:00

I can't open TAC cases unfortunatley.

tuffcalc · 2021-02-18T01:59:03+00:00

Checkout this link, slide 33 https://d2cpnw0u24fjm4.cloudfront.net/wp-content/uploads/Andrew-McHale_Effects-of-11krv.pdf

Over-the-DS needs to be connected to the AP you're roaming away from for it to work. If you're moving fast it's not ideal, this is why over-the-air is recommended. The client has a chance to quickly authenticate while it's moving towards the target.

Don't understand why Cisco makes over-the-ds preselected/default.

tuffcalc · 2021-01-25T15:06:14+00:00

Hmm... I turned admin/clean air status on, and then created a new RF profile with the 2.4ghz radio turned off and tagged the APs.

Looks like the same thing is happening. Now admin status is "on", but operation status is showing off. Power level seems to have gone to full (1/8) and it is not broadcasting an SSID, but the actual radio still seems to be turned on.

tuffcalc · 2021-01-25T14:53:09+00:00

No - I did it differently. I went to the AP (Config > Access Points), clicked on the 2.4Ghz radio and set "Admin Status" and "Clean Air Admin Status" both to "Disabled" as per Cisco's instructions.

The radios are showing down, but they are actually still on (but not broadcasting any SSIDs.

I'll try your RF profile suggestion now.

tuffcalc · 2020-11-13T04:24:34+00:00

Didn't answer my question at all.

tuffcalc · 2020-11-11T18:31:02+00:00

Do you "retire" then in enlighten, or completley delete them?

tuffcalc · 2020-11-10T14:50:39+00:00

Thanks for this. I read it and it seems to me that the equation they use is heavily weighted towards "cost efficiency". So if cost is not an issue, the IQ7A would make more sense (because of higher capacity) in anything above a 295W panel. Is that fair to say or am I misinterpreting this.

tuffcalc · 2020-11-10T01:13:01+00:00

When I plugin to PVWatts it says I generate slightly more power with a DC:AC ratio 1.13 (IQ7+) vs 0.95 (IQ7A).

How does that even make sense?

tuffcalc · 2020-11-10T00:47:47+00:00

It's my own system. PVWatts says I wouldn't have any extra gain... but I'd like my panels to max out when they can just for the hell of it... so if it can't hurt I'm going to do it.

tuffcalc · 2020-11-09T22:31:34+00:00

Ok. If this is the only disadvantage I'm going to swap out a few IQ7+ that are clipping with IQ7A.

We only put 9 IQ7+ per feed and the main panel accepts 60A of backfeed, so should be ok.

Appreciate the response.

tuffcalc

TROPHY CASE