Steve Telford wrote:
> 
> Regarding PIM Sparse, Dense and Sparse-Dense modes, does anyone
> know why the
> often stated design preference for sparse-dense exists?

I think that the logic is that with sparese-dense, the m-cast network could
continue to function even if the RP were to die.  It's just a fallback
mechanism.

> 
> I realise the Auto-RP requirement which is for Dense mode,
> would mean an
> otherwise sparse mode network needs to support dense. Is this
> the main
> driver for sparse-dense or is there some other technical reason?
> 
> I see with software updates Auto-RP can now be supported under
> sparse mode
> only configured interfaces:
> 
> ip pim autorp listener
> 
> which causes the two auto-rp groups 224.0.1.39 and 224.0.1.40
> to be dense
> mode flooded.
> 
> Is there any other requirement for dense mode if the auto-rp
> issue is taken
> away? Anyone got any comments?
> 
> cheers,
> 
> teflon
> 
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> 
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> 
> 




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