07-20-2020 03:37 AM - edited 07-05-2021 12:18 PM
Due to COVID-19 lockdown, we've implemented MS Teams a few months back.
Now that small number of users are back in the office and using mobile devices for Teams, we started receiving reports of some issues on corporate mobile WLAN (MDM managed iPhones) and guest WLAN.
Mostly to do with the call quality, e.g. call drop for half a second every 3ses or so.
WLC is located at the primary data centre, and users' internet access is locally switched with FlexConnect.
Since those reports, I’ve made some update based on docs I’ve found.
As there aren't any MS Teams specific doc by Cisco that I could find, I used Lync as reference and updated the config as follows:
On ASA, allowed UDP 3478-3481 to 13.107.64.0/18, 52.112.0.0/14, and 52.120.0.0/14.
From <https://docs.microsoft.com/en-us/microsoftteams/prepare-network>
On WLC,
SSID QoS = Platinum
WMM Policy = Allowed
Audio = Platinum
Video = Gold
Application-Sharing = Silver
File-transfer = Bronze
Lync Server = Enabled
11k Neighbour list = Enabled
AVC profile
ms-lync-audio mark 46
ms-lync-video mark 34
FlexConnect AVC profile
ms-lync-audio mark 46
ms-lync-video mark 34
Lync Server = Enabled
Port = 15790 (default)
Protocol = Http
I understand from the previous discussions for WLC/Lync/NBAR2/AVC related discussions that:
I saw on the above Cisco doc that 'This WLAN can also be used for Skype and the user would want those packets marked with a DSCP value of 20.' but haven't added this at this time. Not sure whether this is required?
Also, it is not clear to me what ms-lync and ms-lync-control in AVC Applications, and ms-lync and ms-lync-media in FlexConnect applications list. Didn't find NBAR2 doc that helpful understanding what is.
Lastly, when I had a voice Teams voice call with a colleague in the office, I couldn’t see anything on AVC statistics that is Lync related.
I have to monitor how it goes following the above change but I’m not convinced that this hasn’t made much improvement.
Please advise how/where to progress from here!
WLC 5508 running 8.3.143.0
AVC Engine 23
AVC protocol pack 24
WAPs AIR-AP3802I-E-K9
Switch where APs are connected are CAT3850s running #3.06.09E
My understanding is that 3850 switches trust markings on the wired ports so I didn’t make changes to switchports
ASA 5555-X running 9.4(4)29
Many thanks,
07-20-2020 08:33 AM - edited 07-20-2020 08:34 AM
I have enabled the following on 8.5 for AVC and got fairly good results (meaning, I didn't get any complaints so far):
skype voice-and-video mark 34 Bidirectional NA ms-lync-audio business-and-productivity-tools mark 46 Bidirectional NA ms-lync business-and-productivity-tools mark 34 Bidirectional NA ms-lync-video business-and-productivity-tools mark 34 Bidirectional NA statistical-conf-audio other mark 46 Bidirectional NA ms-services other mark 34 Bidirectional NA ms-office-365 other mark 34 Bidirectional NA internet-audio-streaming other mark 46 Bidirectional NA
Please note, I haven't really made a lot of testing, but those were some of the "detected" applications while some users were on-site and used teams (and other communication services).
07-24-2020 03:31 AM
07-24-2020 08:14 AM
08-26-2020 12:18 PM
I have been having the same issue with teams (broken up voice coming to client for the most part) including running a continuous ping to our server room when it happens and the pings time out randomly at the same time as a voice problem.
I have updated setting to match settings from this string but has not resolved the problem.
We are running,
5520 in HS SSO
Ver.8.10.122.0
Protocol Pack 40
Engine 34
AP's
AIR-AP1815W-B-K9
AIR-AP2802E-B-K9
AIR-AP2802I-B-K9
AIR-CAP2702E-A-K9
AIR-CAP2702I-A-K9
C9120AXI-B
thanks,
08-27-2020 12:56 AM
This can be a lot of things. How is the AP and radio interface load when you have interruptions?
Are the client wireless drivers up to date?
If you check the WLC logs (or a debug), is the client roaming when the interruptions happen?
09-08-2020 02:55 AM
We've seen a lot of interference with 11b. So only allowed 11a on one of the WLANs and the signal quality seems to have improved.
Slightly worried about doing this on the guest WLAN as some important guest might show up on an old device that only supports 11b.
Suppose we can enable 'band select' but I see this is not recommended for VoIP.
thanks,
09-08-2020 03:57 AM
09-09-2020 01:25 AM - edited 09-09-2020 01:28 AM
Thanks, that's good to know.
We only allowed 11a radio on per WLAN basis.
Do you mean you've disabled 11b globally?
09-09-2020 02:08 AM
09-10-2020 02:54 AM
Thanks, that's very helpful.
Currently we have 1-9Mbps disabled, 11Mbps Mandatory and then everything beyond that are supported.
On 5Ghz, 6 and 9 are disabled, 12Mbps supported and beyond that are supported.
09-10-2020 04:04 AM
04-14-2023 02:01 AM
What about 9800 series Configuration i am facing ping drop to MS team
04-14-2023 06:28 AM
Better open a completely fresh thread with the problem you have. Also mention the AP type, WLC model and used software release.
04-15-2023 12:11 AM
Have you checked channel utilization while having the connectivity issues? Channel congestion due to excesive devices connected to the same AP/radio, or same channel in the area, could be a problem for these near real-time applications. I would suggest to check that value for APs on the area to see how it looks like during the issues. This command is for C9800:
show ap name <APname> auto-rf dot11 5ghz slot 1 | sec Channel Assignment Information|Load Information|Client
Last but not least, as most of the connectivity issues comes from the client side, as @patoberli recommended before, update drivers and get all operating system's patches. Additionally it would be great if you can deploy QoS profiles in the devices (Windows, MacOs and Linux) to improve transmission as there is not QoS mark in the Apps by default. And enforce some best practices from ALL users while someone is on a call or meeting, as doing things like sharing files between them, downloading content, upgrading software/OS, opening remote content, or any other traffic with huge load, could impact these sensitive applications. I know this is complicated, but if there is little room to control that, check how it is like on a calm area such as meeting rooms with dedicated APs in that area.
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