[SAM] SAM in IPv6

[Stig Venaas]

Scott Boone wrote:
> Has much work been done in the SAM area w.r.t. PIM in IPv6?  My current 
> understanding is that the only RP discovery option in IPv6 is embedded 
> RP.  This doesn't seem to play at all well with readdressing or 
> failovers.  Does anyone have pointers for RP failover work in mobile 
> IPv6 networks?  Is this the right group for me to ask this?

Embedded-RP is the way to go for interdomain multicast (well for
ASM, for SSM you obviously don't need it), but intradomain you can
use BSR for RP discovery as well.

If you do embedded-RP you cannot change the RP address, but you
could consider anycast with two RPs having the same address. It
would work well together with the mechanism in RFC 4610.

Without RFC 4610 you could make it so that everyone uses the same
RP when it is up, and when it goes down, have everyone move to the
other. You would then lose RP state when switching which is not
good, but ongoing multicast would hopefully be through SPTs, and
not be affected by this.

Stig

> 
> Thanks,
> Scott
> 
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