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poor voice vlan quality on Aruba switches

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  • 1.  poor voice vlan quality on Aruba switches

    Posted Feb 14, 2023 03:11 AM
      |   view attached

    Hello Community,

    we have Problem with Voice Vlan and we need Help

    we swapped all our cisco switches with aruba and since then we have had poor voice vlan quality.

    it hacks and sometimes breaks. We updated phone firmware, didn't help. We updated the switch firmware which didn't work either.

    All phones are in voice vlan.

    can someone help us is it possible to prioritize the voice vlan on Aruba?

    what do we have to do to solve the problem? this is a new building and all network cables are new.

    We didn't have that problem with the cisco switches, even though they were really old.

    we have Aruab cx 6100, Aruab cx 6200, Aruab cx 6300. 

    regard David



    ------------------------------
    David
    ------------------------------


  • 2.  RE: poor voice vlan quality on Aruba switches

    EMPLOYEE
    Posted Feb 14, 2023 02:07 PM

    Hi David,

    Do your IP phones mark their traffic with CoS or DSCP? 

    It is quite important in this case. Some phones allow you to enable either CoS or DSCP or both, I'd use DSCP 46 (EF). If you can set both, set DSCP to 46 and CoS to 5. After applying that setting, use packet capture to verify that the DSCP is really set. Then on all your switches use global command 'qos trust dscp'. Thus switches will honor DSCP markings in the ingress packets sent from IP phones and by default will map VoIP traffic (basing the mapping decision on the DSCP value) to the local priority 5. That will map this traffic to queue 5 so the traffic in that queue will be treated with higher priority than in queues 1-4 where the most of the traffic should stay. 

    This in most cases is enough, though in your particular network some additional tweaking may be needed, as re-mapping DSCP 46 to higher local priority, setting different scheduler if the default is not efficient enough etc.



    ------------------------------
    Ivan Bondar
    ------------------------------

    Original Message


  • 3.  RE: poor voice vlan quality on Aruba switches

    Posted Feb 14, 2023 04:47 PM

    Hallo Bondar,

    Thank you for your message

    they are normal ip phones from Agfeo 

    how can i do this, can you please help me. I've only worked on cisco so far and I'm new to the Aruba world. 

    I just thought you only have to create voice vlan and that's it! do you have any examples? 

    tkanks and regard. 



    ------------------------------
    David
    ------------------------------

    Original Message


  • 4.  RE: poor voice vlan quality on Aruba switches

    EMPLOYEE
    Posted Feb 15, 2023 02:41 AM

    Hi David,

    I am not familiar with Agfeo IP phones, to be honest I didn't hear before  about them. But I am sure they can apply those settings, it is 'ABC' of VoIP, even the most basic phones should be able to do it. 



    ------------------------------
    Ivan Bondar
    ------------------------------

    Original Message


  • 5.  RE: poor voice vlan quality on Aruba switches

    Posted Feb 16, 2023 04:37 AM

    Please try below cmd

    qos priority 6

    Voice 


    Original Message


  • 6.  RE: poor voice vlan quality on Aruba switches

    Posted Feb 17, 2023 01:25 AM

    Hello 

    i try this command, is not work

    sw61# configure
    sw61(config)# qos priority 6
    Invalid input: priority
    sw61(config)# qos priority 6 voice
    Invalid input: priority
    sw61(config)# exit
    sw61# qos priority 6 voice
    Invalid input: qos
    sw61# qos priority 6
    Invalid input: qos
    sw61#



    ------------------------------
    David
    ------------------------------

    Original Message


  • 7.  RE: poor voice vlan quality on Aruba switches

    Posted Feb 17, 2023 01:47 AM

    You need to put this under voice vlan 

    E.g

    Vlan 17

    Name "voice"

    Tagged x.x.x.x

    Ip address x.x.x.x x.x.x.x

    Qos priority 6

    Voice


    Original Message


  • 8.  RE: poor voice vlan quality on Aruba switches

    Posted Feb 17, 2023 05:11 AM

    i try this command, is not work
    Voice vlan is alreday exit. vlan 100 ist voice vlan

    sw61(config)# vlan 100
    sw61(config-vlan-100)# Qos priority 6
    Invalid input: qo
    sw61(config-vlan-100)# Qos priority 6 voice
    Invalid input: priority
    sw61(config-vlan-100)#



    ------------------------------
    David
    ------------------------------

    Original Message


  • 9.  RE: poor voice vlan quality on Aruba switches

    Posted Feb 17, 2023 05:22 AM
      |   view attached

    Is this Aruba 2530 switches then it should work

    Try help by using ?

    And enter it will show the command

    I have attached screenshot of my switch configuration 

    Or share me team viewer access version 12


    Original Message


  • 10.  RE: poor voice vlan quality on Aruba switches

    Posted Feb 17, 2023 05:27 AM

    Hello 

    NO!!

    we have 

    Aruba cx 6100

    Aruba cx 6200f

    I wrote it in my post above

    regard



    ------------------------------
    David
    ------------------------------

    Original Message


  • 11.  RE: poor voice vlan quality on Aruba switches

    Posted Feb 17, 2023 05:32 AM

    Please go ahead and log the case with Aruba they will provide support as this are new series switch 


    Original Message


  • 12.  RE: poor voice vlan quality on Aruba switches

    Posted Feb 15, 2023 01:07 AM

    Did you configured the QoS for voice? if not please go ahead and check


    Original Message


  • 13.  RE: poor voice vlan quality on Aruba switches

    EMPLOYEE
    Posted Feb 16, 2023 02:21 AM

    I am assuming that your IP Phones are marking their traffic with DSCP value of EF. if not please ensure that they are.

    each interface has 8x queues 0-7, you can see the statistics  with this command.

    "show interface x/x/x queue " 

    it would be good if you can clear the stats as well before hand.

    then you can set globally, QoS trust mode on all the switches that are in the voice traffic path. 

    the command for it is "qos trust dscp"

    Then after that the "show inter xxxx queue" will show that any traffic with dscp marking of EF (generaly used for voice traffic) will be mapped to Q5

    hope this helps.



    ------------------------------
    If my post was useful accept solution and/or give kudos.
    Any opinions expressed here are solely my own and not necessarily that of HPE or Aruba.
    ------------------------------

    Original Message


  • 14.  RE: poor voice vlan quality on Aruba switches

    Posted Feb 17, 2023 01:51 AM

    Hello 

    i try ths is the output

    q5 is empty? why?

    Interface 1/1/14 ist in Voice vlan and Phone is connected.


    sw61(config)# qos trust dscp
    sw61(config)# sh interface 1/1/14 queues
    Interface 1/1/14 is up
     Admin state is up
                     Tx Bytes        T x Packets          Tx Drops
     Q0           231986886           2106080                 0
     Q1           207151884           1711951                 0
     Q2                             0                        0                 0
     Q3                             0                        0                 0
     Q4                             0                        0                 0
     Q5                             0                        0                 0
     Q6                7739978               63992                 0
     Q7                4526306               20757                 0

    sw61(config)# clear interface 1/1/14 statistics
    sw61(config)# sh interface 1/1/14 queues
    Interface 1/1/14 is up
     Admin state is up
                   Tx Bytes        Tx Packets          Tx Drops
     Q0                 976                 3                 0
     Q1                      0                 0                 0
     Q2                      0                 0                 0
     Q3                      0                 0                 0
     Q4                      0                 0                 0
     Q5                      0                 0                 0
     Q6                  492                 4                 0
     Q7                      0                 0                 0


    q5 is empty? why?



    ------------------------------
    David
    ------------------------------

    Original Message


  • 15.  RE: poor voice vlan quality on Aruba switches

    EMPLOYEE
    Posted Feb 16, 2023 09:32 AM

    QoS is mostly needed if there is a lack of bandwidth. If you find poor voice quality on most/all devices, I would check that all your interfaces (to the phones)/links (between the switches) are free of errors and are not overloaded.

    You need to have quite some underdimensioning to get really poor audio quality; prioritizing traffic may help but in many networks voip is expected to work even without QoS; and many voip sessions these days run even over the internet where you have absolutely no control over QoS. Interface errors/flapping ports/duplex mismatches are more likely to cause what you are seeing.

    Where is your PBX in this network?



    ------------------------------
    Herman Robers
    ------------------------
    If you have urgent issues, always contact your Aruba partner, distributor, or Aruba TAC Support. Check https://www.arubanetworks.com/support-services/contact-support/ for how to contact Aruba TAC. Any opinions expressed here are solely my own and not necessarily that of Hewlett Packard Enterprise or Aruba Networks.

    In case your problem is solved, please invest the time to post a follow-up with the information on how you solved it. Others can benefit from that.
    ------------------------------

    Original Message


  • 16.  RE: poor voice vlan quality on Aruba switches

    Posted Feb 17, 2023 05:21 AM

    Hello 

    PBX and Phones are in the voice vlan.



    ------------------------------
    David
    ------------------------------

    Original Message


  • 17.  RE: poor voice vlan quality on Aruba switches

    EMPLOYEE
    Posted Feb 17, 2023 09:12 AM

    Especially in that case, please check all interfaces for errors/drops/etc... it may be a faulty cable, duplex mismatch or device configuration. With just a 'flat voice vlan', if you have poor audio also when it's not busy on the network, there likely is an issue with some link/port.



    ------------------------------
    Herman Robers
    ------------------------
    If you have urgent issues, always contact your Aruba partner, distributor, or Aruba TAC Support. Check https://www.arubanetworks.com/support-services/contact-support/ for how to contact Aruba TAC. Any opinions expressed here are solely my own and not necessarily that of Hewlett Packard Enterprise or Aruba Networks.

    In case your problem is solved, please invest the time to post a follow-up with the information on how you solved it. Others can benefit from that.
    ------------------------------

    Original Message


  • 18.  RE: poor voice vlan quality on Aruba switches

    Posted Feb 21, 2023 12:41 PM

    Popped into my mind that can this be caused by "checksum issue" in CX series? 

    Do you have any chance to capture data from phone interface with Wireshark and see if there is L3 checksum errors there in data packets? 

    ------------------------------
    Jori Luoto
    ------------------------------

    Original Message


  • 19.  RE: poor voice vlan quality on Aruba switches

    EMPLOYEE
    Posted Feb 21, 2023 08:19 PM

    i think you should plan this out properly, start with how are the voice traffic being marked and come up with the QoS calssification/marking plan then based on that ensure properly queuing isconfiured for end to end traffic.



    ------------------------------
    If my post was useful accept solution and/or give kudos.
    Any opinions expressed here are solely my own and not necessarily that of HPE or Aruba.
    ------------------------------

    Original Message


  • 20.  RE: poor voice vlan quality on Aruba switches

    Posted Feb 24, 2023 08:22 PM

    I contacted support, they got the logs and say they don't see any errors.

    I do not know anymore. I don't know how to prioritize the voice vlan on an aos-cx switch.

    i use thus dokument but not work

    https://techhub.hpe.com/eginfolib/Aruba/OS-CX_10.04/5200-6711/index.html#book.html

    is still the same poor quality

     



    ------------------------------
    David
    ------------------------------

    Original Message


  • 21.  RE: poor voice vlan quality on Aruba switches

    Posted Feb 25, 2023 03:02 AM

    as pointed out before prioritizing shouldn't be needed if your network isn't overloaded. which on a general office network shouldn't be the case.

    is there monitoring in place to view bandwidth usage of switch ports? do other traffic streams also suffer from issues? like can you download something from the internet at expected speed? can you ping within the network without loss?

    and further try to isolate the problem. 

    if you connect a phone (or two to test) on the switch where the PBX / voice gateway is connected. does the bad quality occur there also? 

    do you have the possibility to just take one switch (either Aruba or other one) and for the test connect only the PBX and two phones? what is the result?


    Original Message


  • 22.  RE: poor voice vlan quality on Aruba switches

    Posted Feb 25, 2023 07:30 AM

    Can you check from 6200/6300 series switch port where there is phone connected, "ip error" counter… if counter is rising, you should do port mirror from phone port and see if there is checksum issues in incoming data packets. There is undocumented feature in CX6100-6300 fw which silently drops all packet having bad checksum which caused "robotic" sound to audio streams in one system.



    ------------------------------
    Jori Luoto
    ------------------------------

    Original Message