All things related to multicast

["David Farmer" <>]

I would like to thank Kevin and Marshall for bring us back on topic

On 7 Aug 2002 Marshall Eubanks wrote:

> An on topic post !
> 
> Kevin C. Almeroth wrote:
> 
> > 
> > Well, I've been very careful not to exclude work on IPv6 ASM... 
> > just to say that SSM is a lower hanging fruit and it will be the
> > first place we start.

I agree that SSM is the place to start for IPv6 multicast on I2 and 
more specifically on the Abilene backbone.  

> > As for the value of ASM, it certainly has a niche.  The point though
> > is to separate ASM from MSDP and come up with some additional 
> > options. 'Cause right now, ASM using MSDP stinks.  So maybe that 
> > second option moves the source discovery functionality out of the 
> > network. 

I think we can quickly get SSM for IPv6 working with help from 
vendors.  Which correct me if I am wrong, this requires PIM-SM for 
IPv6 and Multicast IPv6 NLRI for BGP.  And just as important, what 
are the host protocols needed IGMP??  And what host OSes 
support IPv6 multicast, what work is needed there?

Once that is done we can tackle the question of MSDP for IPv6, a 
replacement for MSDP for IPv6, or what I believe is needed from the 
SSM folks a draft explaining how any situation in ASM can be 
emulated with a registration via unicast to a well known registry 
host(s) per application for the admitted limited set of applications 
that need ASM.  Maybe this exists, but then you should be pointing 
us to it.  But the MSDP debate can not be allowed to slow down 
IPv6 multicast on Abilene and since most of the obvious short term 
applications can be met with SSM let's to that first.

I also think we should look at rethinking multicast as a whole like Bill 
Nickless is talking about, but I'm not sure IPv6 Multicast on Abilene 
should wait for that.


> What, exactly, is the plan to make IPv6 multicast multidomain ? Will
> BGMP come back from the dead ? Or will MSDP-NG rear its head? 
> 
> If nothing is done, then someone will port MSDP to IPv6, and it will
> be deja vu all over again.  

I agree, but I put the responsibility for this on the SSM faithful, they 
need to convince the ASM faithful and the rest of us on the fence 
that we can live with out MSDP or a replacement router based 
source discovery protocol.  Otherwise MSDP or a replacement will 
be created for IPv6.

> Unless some vendor is going to jump on BGMP in a big way, I would urge
> that work begin immediately to make MSDP into something that will last. 
> 
> Just my $ 0.02 worth.
> 
> Marshall
> 
> 
> > -Kevin

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