best radio settings for AP 1562 mesh bridge

[ablin]

Could someone share the best radio settings for a maximum throughput on a bridge between 2 AP 1562D with a WLC 2504 ? Thanks

[Scott Fella]

To get best throughout in a point to point mesh bridge, you need correct line of sight and directional antennas of distance is a variable. Other than that, use uni-3 channels to avoid any dfs issues. A spectrum scan between the two points can help determine possible channels that are being used by other systems.

[ablin]

We will have a direct and clear view between the 1562D. The question is about what should be selected in the complex 2504 set or parameters in order to abotain the maximum throughput. I've already disabled low data rates below 24 Mbps and enabled DCA, but the flow is limited to about 300 Mbps and I thought we could obtain at least 600 !

[Scott Fella]

The throughput is hardware dependent on the AP. Don’t use DFS channels. You AP’s seem to be close and negotiating properly to obtain 300mbps. That shows 40mhz channels. If the AP doesn’t support 80mhz or more, then you will not achieve more than what you see.

[ablin]

I've set 80 MHz channel Width for 802.11a/n/ac and many other settings that i found recommended in the huge cisco documentations. But globally, i am not sure all i have done i correct. So i'm asking here if someone can share the correct settings. Maybe a single badly checked boxe in my config is actually reducing the throughput. For example, i'm not sure all available spectrum is well used in my config. When i issue sh run-config i see MCS 16 to 31 disabled on the AP while they are enabled on my general config : sounds like an error... 

[Scott Fella]

Post some screen shots of your settings. Leave the MCS rates alone and play around with the OFDM data rates and try to disable more and more of the lower rates but be aware of the link going down. Setting your channnel width high doesn’t matter if the AP doesn’t support that channel width on the backhaul. If you get your link up and it’s solid at 300mbps and that is the highest your mesh AP supports, there is nothing else to do. For true bridge to link buildings/sites together, there are other vendor bridges that can provide higher throughout like 1gig full.

[ablin]

Here is the run-config if you want to have a look. Thanks.

[Scott Fella · Accepted solution]

I would upgrade to v8.5.110.0 which is MR1 at least. Then I would see if the uni-3 channels are allowed in your country, like 165 for example and use that. You have the uni-2 extended and if any radar is detected, the AP will go offline and look for another channel which will take the link down. Then I would only is one mandatory rate and start that at maybe 24 or 36 and keep the lower on as supported. Example 24 man 18 sup or 48 man 36 sup. Do this and see if the link stays up as this should help with throughput. However you will be limited to what the AP can do as far as channel width.

[ablin]

Thanks ! I didn't seen there was an update (mine was downloaded only 2 weeks ago !) which seems to fix many problems with those AP 1562...

[Scott Fella]

MR1 came out like around 2 weeks ago so maybe you just missed that. Just keep in mind that this code train is still young and eventually when there is an MR3 +, that’s typically when things get stable for that code.

[Scott Fella]

One thing also, when you are tweaking or let’s say optimizing the backhaul link, the client access is something you also need to be aware about. Typically your 5ghz is the backhaul and you don’t want to allow client access on that. So the 2.4ghz is the client access and wireless is still half duplex. So the more clients the less throughput each client will have. Also the RF from other wireless and non-wireless that can interfere with performance. Also the further out the client is the the lower the negotiated data rate for that client. It’s the same consideration you take for indoor, you look at a density and then overall cost and you find a balance and can set the expectations.