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Bring performance and reliability to your network with the Aruba Core, Aggregation, and Access layer switches. Discuss the latest features and functionality of the ArubaOS-Switch and ArubaOS-CX devices, and find ways to improve security across your network to bring together a mobile first solution.
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QoS confirmation

  • 1.  QoS confirmation

    Posted Jul 07, 2019 12:08 PM

    I have raised a couple of posts on the forums about VLAN and QoS priority so far and the feedback has been very helpful and positive so far so thank-you.


    Only one little point I would like some feedback from. I am using an Aruba 2530 (J9780A) switch and want to concerntrate on the layer 2 for this query.


    Basically I want to confirm my QoS configuration so far.


    My VLAN's work fine (I get split networks on 2 different IP ranges) so am happy with the VLAN'S, despite the fact I cannot see a VLAN tag in the Wireshark trace (I am running a mirror port on the VLAN trunk/uplink/tagged port) I also cannot see any priority tagging for traffic in Wireshark either.


    I run the command on the Aruba "show qos vlan-priority" and get the below:


    VLAN-based Prioritization

    VLAN ID Apply rule | DSCP Priority
    ------- ----------- + ------ -----------
    1 No-override | No-override
    40 Priority | 5


    My VLAN configuration shows this priority set also (some un-relevant entries removed):


    vlan 40
    name "VOICE"
    qos priority 5


    Obvously confirmation would be that I get crystal clear voice on a call without dropped packets, but was just wondering if anyone had anything to confirm these points on a switch level before going live with the customer.


    Anyone with an experience of finding these packets on Wireshark also I would be keen to hear your points. And I have checked the Wireshark forum also.


  • 2.  RE: QoS confirmation

    Posted Jul 09, 2019 10:36 AM

    Are you using Wireshark on a Windows PC? In my experience, Windows NIC drivers do not pass the DSCP or CoS tagging on packets. When I was setting up and testing QoS for our VoIP system, I ended up using a laptop with Kali Linux installed to do my Wireshark captures. I believe other flavors of Linux will work for this as well. 

  • 3.  RE: QoS confirmation

    Posted Jul 09, 2019 11:09 AM

    Thanks for responding, that is a very interesting point that I was not aware of. I am using a Windows machine for running Wireshark for simplicitys sake.


    I can however run Linux with T-shark and see if I get a positive result I will update shortly.

  • 4.  RE: QoS confirmation

    Posted Aug 06, 2019 06:22 AM

    it is good ?