Large IPv6 Multicast Domains

James Small jim.small at
Sat Jun 7 21:40:17 CEST 2014

I can confirm that IOS (and assuming NX-OS) supports Anycast RP using PIMv6
(RFC 4610).  However, I haven't tested this for Embedded RP so not sure if
that throws a curve ball.  The challenge with Embedded RP is it become a new
application requirement.  From the network perspective it's not a big deal.
However, from the application owner perspective it could be.  I can't speak
to that because I'm not a developer.  It is a change from IPv4 though which
means it needs to be sold to the App-Dev group.


> -----Original Message-----
> From: at [mailto:ipv6-
> at] On Behalf Of Phil Mayers
> Sent: Saturday, June 07, 2014 4:00 AM
> To: Gert Doering
> Cc: ipv6-ops at
> Subject: Re: Large IPv6 Multicast Domains
> On 07/06/14 08:12, Gert Doering wrote:
> >> But anycast rp for resilience of nothing else is not uncommon.
> >> What's the mechanism for anycast embedded rp sync?
> >
> > Now that is a very good question.  I have no answer to that - that
> > used to be done with MSDP, MSDP is gone...
> I must own up to being slightly rhetorical here; RFC 4610 describes
> using PIM for RP-RP sync, and we in fact use that on JunOS to implement
> anycast RP without MSDP.
> I guess the real question is, is there a PIM6 version of 4610, and is it
> widely supported. I know JunOS has it, and docs suggest NX-OS does, but
> not sure about IOS, and not sure about any of them for IPv6.

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