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Cell Relay Retreat>MPLS WG Archive>month:2001-Jun> msg00367



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What to do with an illegal label stack?

  • From: Sajith Kizhikkepurayil <Sajith_Kizhikkepurayil@pmc-sierra.com>
  • Date: Mon, 25 Jun 2001 09:53:31 -0700
  • Cc: mpls@UU.NET

>An MPLS packet arrives with a label stack with no
>bottom of stack bit set (e.g. 88 47 22 22 20 60 00 00
>00 00 00 00...).
>
>Is any behavior mandated here?  Is it OK to forward
>this packet, or must it be discarded?

i believe there is no way a forwarding plane can detect
this, unless there is an upper limit on number of labels
in the stack defined by the standarad, which, i believe
is not the case

so the packet will be forwarded, unless there any other
errors

thanks
sajith