[SAM] SAM Overlay Protocol

[Matthias Waehlisch]

Hi John,

On Tue, 29 Apr 2008, John Buford wrote:

> Isn't "overlay group address" somewhat circular?
>
  why? There is an underlay and overlay group address. And there are 
overlay PeerIds ... Overlay address seems to me a bit unspecified in the 
context of multicast.

> Could you explain in more detail the problem with the current
> text?  Are you saying there are instances where the groupId isn't
> the root of the tree?
>
  Yes, one example for this is CAN multicast. The group address in CAN is 
used to address the bootstrap peer. Based on this, the mini CAN will be 
constructed. However, data distribution is based on flooding the mini CAN. 
As far as I understand: Each member of the mini CAN may be inherently a 
source.

  Another approach is the bidirectional shared distribution tree, which we 
sketched in Chicago 
http://www.ietf.org/proceedings/07jul/slides/SAMRG-3.pdf (for the paper 
cf. http://www.realmv6.org/bib/ws-buode-07.html) and elaborate at the 
moment.


Thanks
  matthias

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Matthias Waehlisch
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