Large IPv6 Multicast Domains

James Small jim.small at
Wed Jun 4 21:20:26 CEST 2014

Thanks Phil.

What about inter-domain IPv6 multicast?  It's SSM, Embedded-RP, or bust?
That seems rather limiting but maybe that's how it is.

Also - if you can't really have multiple PIM domains (or can't live with
above restrictions) do you just use one gigantic PIMv6-Anycast domain?  Is
that the best practice and you rely on Anycast to keep traffic "local?"


> -----Original Message-----
> From: at [mailto:ipv6-
> at] On Behalf Of Phil Mayers
> Sent: Wednesday, June 04, 2014 2:52 PM
> To: ipv6-ops at
> Subject: Re: Large IPv6 Multicast Domains
> On 04/06/2014 16:57, James Small wrote:
> > 1)There is no MSDPv6 and probably never will be.  Of course you have SSM
> > and Embedded RP but that doesn't cover all cases.  For example - if you
> > have a partnership with another organization and only want to share
> > select multicast groups/sources then in IPv4 you use MSDP and MSDP
> > filters.  However, I don't see how to do this with IPv6 multicast.
> Well, in IPv4 on IOS you want both MSDP filtering and "ip multicast
> boundary", which filters both PIM control and data-plane traffic.
> Sadly it would appear IOS has dropped ACLs for boundary on PIM6, and
> assumed that the IPv6 mcast scope is sufficient for all use-cases!
> NX-OS has "ipv6 pim jp-policy" and "match ipv6 multicast" options in
> route-map, but this seems to be lacking from IOS.
> JunOS of course has it.
> It seems you can't do this right now on Cisco IOS?

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