ExtremeSwitching (EXOS)

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AVB - Changing the class priorities for Class A and Class B

  • 1.  AVB - Changing the class priorities for Class A and Class B

    Posted 09-19-2016 13:28
    Hi Everyone,

    I am working in an AVB project with a Summit X440-8t switch (EXOS 15.7.1.4). I have a question about the AVB class priorities assigned to Class A and Class B, and the possibility to change them.

    Background:
    IEEEE P802.1p defines default attributes for traffic classes:

    • for Class A the ClassPriority 5
    • for Class B the ClassPriority 4
    The ClassPriorities are encoded in the VLAN tags in the corresponding PCP values.

    It looks like the switch has the following default attributes for traffic classes:

    • for Class A the ClassPriority 3
    • for Class B the ClassPriority 2
    My question is:
    Is it possible to change in the switch the class priorities for Class A and Class B? I would like to have for Class A the ClassPriority 5 and for Class B the ClassPriority 4.


    I did not find anything related to changing the ClassPriorities in the EXOS documentation
    The reason why I would like to increase the class priorities is that I want to run the AVB streams with higher priorities than other TCP traffic that runs in the same AVB domain on priorities 3 and 2.

    Help would be appreciated!

    Thank you,
    Atis






  • 2.  RE: AVB - Changing the class priorities for Class A and Class B

    Posted 09-19-2016 14:41
    Atis,

    Unfortunately the dot1p mappings of the AVB traffic are not user configurable. The other traffic will need to be re-mapped to a different 802.1p value.


  • 3.  RE: AVB - Changing the class priorities for Class A and Class B

    Posted 01-17-2020 22:27

    Currently I’ve a Summit-x440-8t switch and I’m trying to send CLASS A (Priority 3) avb packets to the switch.  But SWITCH is modifying the Priority to 0 and sending it to the listener.  How to over come this issue.  Could you please provide a detailed step on how to change the settings with actual commands.