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MTU blackhole with PWHT?

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  • 1.  MTU blackhole with PWHT?

    Posted 10-18-2019 07:42



    Is this a common issue with vMX? I seem to be down around 30 bytes with no unreachables on my pseudowire terminated subscribers? No issues on the locally terminated ones.


    I've raised the core interfaces to 9192 and tried varying the MTU on the ps0 interface itself to no avail.


    I'm wondering if the issue is specific to the vmx-junosdev.conf file? Do I need to match the MTUs in there, too?


    Any thoughts much appreciated.

  • 2.  RE: MTU blackhole with PWHT?
    Best Answer

    Posted 10-19-2019 14:30



    Not everything supports MTU 9192 it seems so lowered interfaces to 3000. It was necessary to mimic this in vmx-junosdev.conf too.