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Re: I-D ACTION:draft-ietf-l3vpn-ppvpn-mcast-reqts-00.txt

Sarvesh,

> <clip>
>  From this
>     perspective, the deployment of multicast-based services within an L3
>     PPVPN environment SHALL benefit from DiffServ [RFC2475] mechanisms
>     that include multicast traffic identification, classification and
>     marking capabilities, as well as multicast traffic policing,
>     scheduling and conditioning capabilities.  Such capabilities MUST
>     therefore be supported by any participating device in the
>     establishment and the maintenance of the multicast distribution
>     tunnel within the VPN.
> 
>     As multicast is often used to deliver high quality services such as
>     TV broadcast, the solution should have additional features to support
>     high QoS such as bandwidth reservation and call admission control.
> 
> RPB>
> RPB> These features don't exist in non-VPN multicast. Therefore, I think 
> RPB> that the might be out of scope for VPN multicast.
> RPB>
> <clip>
> 
> Yeah you are right when you say these feature do not exist in non-VPN
> multicast. But in the problem that we are addressing, the cusomters
> would end up buying Multicast VPN service from the providers and
> I think they would like to know the performance characteristics of
> the service being provided. While customers can control the performance
> of multicast data transmission in their network, I guess it would
> be unacceptable if they cant determine what the behaviour would be
> like when data crosses from PE to PE.
> 
> Moreover since the SP is serving different VPNs, if there are no
> QoS guarantees, the possibility exists that SP can start favouring
> customers of one VPN ove r the others. Or the other way around, the
> SP may want to give preferential tre atment to customer traffic
> depending on what they are paying for.

I certainly agree with you. The QoS features mentioned above
are available for the unicast 2547 VPN service, and should
be available for the multicast 2547 VPN service as well.

Yakov.