The MPLS WG Archive

[Carlos Patriawan <carlos_mpls@yahoo.com>]

> (2) What is "Propagating"?
> 
> 
>       Could you tell me the reason why the algorithm
> check the state, 
> 
> 
>      "Has LSR previously received and retained a
> label  mapping for FEC from
> Next Hop?.", 
> 
> 
>       and set "Propgating" with "IsPropagating" or
> "NotPropagating"? What
> does it mean?
>  
> Propagating state might be thought of as indicating
> - for independent
> control
> - whether the Label (about to be given) is bound to
> a down

Yes, Indeed it's needed by the LSR to avoid receiving
another label for the same FEC when it comes from the
same downstream(next-hop) LSR. This condition should
be prohibited when LSR already has a label value for
the same FEC/next-hop LSR. If the condition is allowed
then ILM table may get confused.


Carlos Patriawan

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