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  • 1.  ACX7024X label imposition limit

    Posted 10-01-2025 05:39

    Dear Juniper experts,

    On ACX7024 platform, by default the label imposition limit on an interface is 3. The JUNOS config allows to configure maximum-labels up to 16. However, even with 16 configured on all interfaces, the router advertises the MSD of 4 in IS-IS and BGP-LS.

    I know that Qumran 2 can impose maximum 8 labels, but I couldn't find any relevant Juniper documentation regarding label limit on the ACX platforms.

    So my questions are:

    1. How many labels can ACX7024 push at once?
    2. Is there a separate limit for transport and service labels?
    3. Does the MSD of 4 concern only transport labels, or the entire label stack?
    4. Does this also include TI-LFA labels for repair path?

    Thanks,

    Dmytro



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    DMYTRO SHYPOVALOV
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  • 2.  RE: ACX7024X label imposition limit

    Posted 10-02-2025 11:39

    Hi Dmytro,

    This is quite a specific use case that we strongly recommend to take JTAC or Profession service engagement. This requires protocols, rpd infra and platform expertise

    On the interface, the max label it can put is 16. This includes transport label, vpn label and bypass label, all. 

    We've ran into issues with SR deployment that when resolving protocols next-hop, the default label stack is 4 to resolve next-hops, a knob is required increase the limit

    set routing-options forwarding-table chain-composite-max-label-count 16

    Similar caveats exist on different platform. Thus a dedicated lab for the scenario with juniper experts will help answer your questions further



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    mengzhe hu
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    Original Message


  • 3.  RE: ACX7024X label imposition limit

    Posted 10-02-2025 13:40

    Hi Mengzhe,

     

    Thanks for your reply.

    I applied this command and it increased the advertised MSD from 4 to 12. Does it mean ACX7024 with Q2u will be able to push 12 labels? I believe the platform limit is lower. 

    In my opinion, this is a fairly basic question about platform spec, similar to the number of ports or the number of routes supported. Information about other vendors label stack limits is publicly available. 



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    DMYTRO SHYPOVALOV
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    Original Message