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


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

1 reply

Userlevel 6
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.

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