[j-nsp] P2MP TE multicast

[michael.firth at bt.com]

For P2MP LSPs the difference between the operation with Multicast or Unicast addresses is minimal. The route appears similar to a Unicast route, but because the address is between 224.0.0.0 and 239.255.255.255 it is a Multicast address.

To get P2MP to handle Multicast addresses you need to configure an additional hidden command on the ingress interface - 'set routing-options multicast interface <x> enable'.

When we last tried mixing the two P2MP and PIM could not co-exist well on the same box - when the interface flapped PIM inserted some extra routes which stopped the P2MP static route working.

I think it should be possible to interconnect PIM clouds using P2MP by doing the following:

1) Have an additional router at the ingress running PIM, which has a static IGMP join configured for the required Multicast groups, pointing them at the interface connected to the P2MP Ingress router.
2) Have additional routers at the egress points running PIM, and set a static route from the P2MP egress point to a unicast address on the PIM router.

I haven't actually tested this, as our P2MP application only has a single destination at each egress point, so we don't use PIM at all.

Regards

Michael

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Michael Firth
Video Communication Solutions
BT Exact
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* +44 1473 641333
* michael.firth at bt.com
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> -----Original Message-----
> From: juniper-nsp-bounces at puck.nether.net 
> [mailto:juniper-nsp-bounces at puck.nether.net] On Behalf Of 
> Charlie valderrama
> Sent: 23 November 2005 00:49
> To: lenny
> Cc: juniper-nsp
> Subject: Re: [j-nsp] P2MP TE multicast
> 
> 
> Leonard,
> 
> in your example below, isn't that a unicast static route?  
> Also, how do you perform multicast routing on the LSP egress 
> node?  Assume that PIM is enabled on some nodes before and 
> after the P2MP LSP.  I hope these questions make sense.  My 
> multicast knowledge is limited.  Let me know if you have a 
> more complete configuration. Thanks.
> 
> CV
> 
> ---------- Cabeçalho inicial  -----------
> 
> De: "Leonard Giuliano" lenny at juniper.net
> Para: "Charlie valderrama" valderramac at terra.com
> Copia: "juniper-nsp" juniper-nsp at puck.nether.net
> Fecha: Fri, 18 Nov 2005 22:59:19 -0800 (PST)
> Asunto: Re: [j-nsp] P2MP TE multicast
> 
> > 
> > Currently, you have 2 options for transporting mcast 
> traffic over P2MP
> > LSPs:
> > 
> > 1) CCC- simulates mcast over an L2 transport, very similiar to ATM 
> > mcast
> > 2) Statically routing the mcast group over a P2MP LSP, 
> which would look 
> > something like:
> > 
> > routing-options {
> >     static {
> >         route 225.1.1.1/32 {
> >             p2mp-lsp-next-hop abc-p2mp-lsp;
> >         }
> >     }
> > }
> > 
> > 
> > -Lenny
> > 
> > On Fri, 18 Nov 2005, Charlie valderrama wrote:
> > 
> > -) I've been reading about P2MP LSPs and I'm trying to 
> understand how 
> > IP
> > -) multicast can work with a P2MP LSP.  The documentation 
> only explains 
> > -) how to route unicast traffic and does not mention 
> multicast.  Is CCC 
> > -) the only alternative to pass multicast traffic other 
> than tunneling 
> > -) multicast as unicast? Thanks.
> > -) 
> > -) CV
> > -) 
> > -) _______________________________________________
> > -) juniper-nsp mailing list juniper-nsp at puck.nether.net
> > -) http://puck.nether.net/mailman/listinfo/juniper-nsp
> > -) 
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