The local config determines the remote transmit interval but not all devices 
support fast PDUs.  They can be mismatched.  This is from the spec not Ciscos 
implementation persay.  

Phil 

On Oct 29, 2012, at 3:43 PM, "Chuck Church" <chuckchu...@gmail.com> wrote:

> Anyone,
> 
> 
> 
>                Been googling for an hour, can't find anything definitive.
> Trying to go LACP between an ASR (using 2 built-in gig ports) and a switch
> stack (3750 or 2960S).  Would like to use the fast mode of LACP PDUs ('lacp
> rate fast' on the ASR).  This command doesn't seem to exist on the small
> switches from what I can tell.  If one side is configured with 'fast' and
> the other isn't, will they negotiate to the faster speed, the slower speed,
> or not at all?  Or will they work, but with one side reacting in 3 seconds,
> and the other in 90?  Unfortunately I don't have a small switch at my
> disposal to try it myself.  The output of show lacp neigh leads me to
> believe the other device requests your sending speed:
> 
> 
> 
> sh lacp 1 nei det
> 
> Flags: S - Device is requesting Slow LACPDUs
> 
>            F - Device is requesting Fast LACPDUs
> 
> 
> 
> Anyone know for sure?
> 
> 
> 
> Thanks,
> 
> 
> 
> Chuck
> 
> 
> 
> _______________________________________________
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