[c-nsp] PIM Split Rules and Multicast over L3 MPLS VPN

[Oliver Boehmer (oboehmer)]

alaerte.vidali at nsn.com <> wrote on Tuesday, January 22, 2008 6:09 PM:

> Hi,
> 
> PIM considers source of multicast to perform load splitting when the
> command "ip multicast multipath" is entered. When using multicast over
> L3 MPLS VPN, the source IP is the IP of PEx for any customer group
> connected to PEx.
> Any way to overcome this limitation and achieve load splitting of
> multicast over L3 MPLS VPN?
> 
> For example, consider this scenario:
> 
>  Sender for group G1 and
> G2---CE1-----PE1------P1-----PE2----CE2----receiver of G1 and G2
>                                        |               |
>                                        |_______P2______|
> 
> The goal is having one G1 taking path PE1--P1--PE2 and G2 taking path
> PE1--P2--PE2.
> (but without using GRE encapsulation to have multicast encapsulated
> into unicast)

12.2SRB for the 7600 introduced "ip multicast multipath s-g-hash basic"
which allows you to do the hash on source+group.. Platform support for
this is still limited, not sure about your environment.

	oli