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RE: Re: Layer 2 MPLS VPN

  • From: "Andrew Walding" <andyw@cellstream.com>
  • Date: Mon, 17 Jan 2005 09:11:18 -0600
  • Cc: <raszuk@cisco.com>, <sthaug@nethelp.no>, <Andrew.Frazer@nz.unisys.com>, <mpls-ops@mplsrc.com>
  • Resent-Date: Mon, 17 Jan 2005 10:50:25 -0500
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Yakov,

Indeed.  Can you give us any insight into possible developments in this
area?  I have an IP TV application that is going to depend heavily on this
in the future.

Thanks

______________________________
Andrew Walding, President
CellStream, Inc.
Tel: 972-747-0007   Fax: 972-747-1130
www.cellstream.com
 

> -----Original Message-----
> From: Yakov Rekhter [mailto:yakov@juniper.net] 
> Sent: Monday, January 17, 2005 8:42 AM
> To: Irwin Lazar
> Cc: raszuk@cisco.com; sthaug@nethelp.no; 
> Andrew.Frazer@nz.unisys.com; mpls-ops@mplsrc.com
> Subject: Re: [MPLS-OPS]: Re: Layer 2 MPLS VPN 
> 
> Irwin,
> 
> > The need for IP multicast, which is tough to do over a 2547 service,
> 
> Current IP multicast support in VPLS has its own set of problems,
> mostly to do with the fact that it uses ingress replication as the
> only way to handle IP multicast.
> 
> While ingress replication is quite viable in the scenarios where the 
> bandwidth of the multicast traffic is low or/and there is a sparse 
> distribution of receiving PEs, such that the number of replications 
> performed by the ingress PE on each outgoing interface for a 
> particular 
> customer multicast data packet is small, in other scenarios viability
> of ingress replication is (highly) questionable. And other scenarios
> do exist in real life.
> 
> This is not to say that the current support for IP multicast in 2547 
> does not have its own problems - it does.
> 
> The bottom line is that neither current support for IP 
> multicast in VPLS,
> nor in 2547 VPNs is good enough.
> 
> Yakov.
> 
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