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  • 1.  Priority tagged vlan

    Posted Jul 05, 2023 08:11 AM

    I am digging into QoS stuff and have a question. Does AOS-CX support (or plan to) Priority Tagged Vlans? I mean frames with a  802.1Q header where VLAN-ID field is all zeroes? I just learnt that Cisco supports encapsulation priority-tagged or encapsulation dot1Q 0 syntax . Does AOS-CX have something like this?



  • 2.  RE: Priority tagged vlan

    Posted Jul 05, 2023 09:11 AM

    Hi Tommyd

    Are we talking of edge-ports here (e.g. where end systems like a server or clients are connected) or network ports (connections to other switches etc.)?

    I could imaging that tagging the native VLAN to the link could solve your challenge even though I don't know for sure. 

    Regards, 
    Thomas




  • 3.  RE: Priority tagged vlan

    Posted Jul 05, 2023 09:29 AM

    It is not a challenge, I am just curious. I do not use this kind of configuration,  however I might have some place where tagging of the native vlan  would be useful because it allows to carry CoS bits. But, on the other hand, it is to exotic and probably unsupported on most end systems.

    I already know that following syntax is possible and valid. 

    interface 1/1/2
        no shutdown
        vlan trunk native 1 tag
        vlan trunk allowed 1

    The resulting frame looks like this

    However when the priority tagging is used the ID field would  be 0000 0000 0000.




  • 4.  RE: Priority tagged vlan

    Posted Jul 05, 2023 07:19 PM

    i dont believe that is supported on CX switches. perhaps others can chime in.



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