[c-nsp] Multicast support in single vrf

[Phil Mayers]

On 03/08/2011 10:54 PM, John Elliot wrote:
>
> We have a client wanting us to support multicast across our
> network(They have multiple tails in single vrf, connected to our
> P/PE's(All 7200's)
>
> (Customer is running there own RP)
>
> As we are only provding multicast support to a single customer, On
> our P/PE routers is it still necessary to enable multicast routing
> globally, MP-BGP Loop Interfaces and tag-switching/mpls interfaces?

Yes. MVPN encapsulates customer multicast in GRE-over-provider 
multicast, so you'll need PIM for that to flow.

> (I'm guessing it would be as the client has tails terminating on
> multiple P/PE's?)
>
> Client is running sparse-mode on all there CE Ints - So assume we
> will need to?(Or are there any benefits in us running sparse-dense
> mode)?

I would generally recommend sparse-mode. But you can run e.g. PIM-SSM in 
the provider core. All that matters is that the PEs can send multicast 
to each other.