Very interesting, thanks for the info.Sent from my Verizon, Samsung Galaxy smartphone -------- Original message --------From: Aaron Schneider via AF <af@af.afmug.com> Date: 11/24/20 12:32 PM (GMT-05:00) To: AnimalFarm Microwave Users Group <af@af.afmug.com> Cc: Aaron Schneider <aaron.schnei...@cambiumnetworks.com> Subject: Re: [AFMUG] [ External ] Re: Cambium PMP v20
Hi Adam, The “Zoom Meetings”, or “Zoom QoS” part of this example is an example of what this could be used for. And in the coming days and weeks, Cambium will be announcing a bit more in that regard. The main point of this feature is to simplify DSCP config, as well as, more importantly, take care of the return traffic problem. DiffServ only works if the traffic is properly marked, either the DSCP/ToS bits in the IP header, or the 802.1p field of VLAN tags. In the uplink, that is pretty straightforward to accomplish, but the return path may not always be properly marked, and so you have a mismatch of prioritization of traffic in both directions. This feature will track the connections matching this configuration in the upstream so that when the return traffic comes, it can be properly restored to the matching DSCP and priority in the downstream. The other part of this, as it pertains to things like Zoom Meetings, or Teams Meetings, etc, is getting the originating traffic onto a desired codepoint. There are ways to do that, but there is an update coming for our cnPilot series (starting with the WiFi 6 gear) that will be able to identify the traffic via DPI and get it onto a desired DSCP in the uplink. Here is a link for a way to do it in Windows 10 applying a QoS policy to zoom.exe directly: https://support.zoom.us/hc/en-us/articles/207368756-QoS-DSCP-Marking. Another benefit of this, is that it is configured per subscriber, so theoretically you can have different priority experiences for different customers whereas today, with the single DSCP config on the AP for the downlink, that would apply to all downlink traffic. And another thing is that it is a dynamic configuration, so it essentially acts as an overlay to the device’s DSCP configuration. So this allows you to have virtual DSCP mappings on the AP per subscriber rather than a single config for all subscribers. The basic reason for the feature is to handle properly prioritizing the return traffic if we configured it as a DSCP worth preserving in both directions. And for Zoom, it makes a noticeable difference in video and audio quality when this is enabled and there is a lot of other background traffic on the link. I see that the release notes didn’t include a bit of the background information I had originally supplied, so we’ll look to get some of that added back in. One important thing to recall is this: Please note that this feature is closely related to both DiffServ as well as each SM's number of enabled Data channels. While this feature allows for setting Low, Medium, High and Ultra High options, it will only work if the proper number of data channels are configured. Otherwise, the QoS to Data Channel mapping will operate in the same way it does today with mapping of ToS to Data Channels: 1 Priority Level Enabled, ToS 0-7 goes over single, Low priority Data Channel (DC) 2 Priority Levels Enabled: ToS 0-3 (Low and Medium) goes over Low DC, 4-7 (High and Ultra High) goes over High DC 3 Priority Levels Enabled: ToS 0-1 (Low) goes over Low DC, 2-3 (Medium) goes over Medium DC, 4-7 (High and Ultra High) goes over High Priority DC 4 Priority Levels Enabled: ToS 0-1 (Low) goes over Low DC, 2-3 (Medium) goes over Medium DC, 4-5 (High) goes over High DC, and 6-7 (Ultra High) goes over Ultra High DC. Also, note that this is also an option on the PTP 450x devices, but there, since there is no presumed “uplink” device, you will have to configure what role the BHM is playing in your network topology. Otherwise, the operation is very similar. The configuration is always on the BHM, but the tracking and statistics will be on whatever device is the “Uplink” device, as that is the one that has to restore DSCP in the downstream direction. Regards, and Happy Thanksgiving to everyone! Aaron From: AF <af-boun...@af.afmug.com> On Behalf Of Adam Moffett Sent: Tuesday, November 24, 2020 4:31 AM To: AnimalFarm Microwave Users Group <af@af.afmug.com> Subject: [ External ] Re: [AFMUG] Cambium PMP v20 Wait, false alarm. This example in the manual confused me. Zoom was just a text description for DSCP 45. It's not obvious to me what this feature does that the existing DiffServ feature didn't do. On 11/24/2020 5:19 AM, Adam Moffett wrote: Did anybody notice that software release 20.0 has a feature to give Zoom high priority?
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