All things related to multicast

["David Farmer" <>]

I assume you are asking how to make multicast work in this situation.

You need a mVPN (multicastVPN) solution.  We have Cisco's solution 
working.  I believe Juniper has a solution.  I haven't heard of anyone else 
having a mVPN solution, but then I haven't looked lately either.

Pointer to Cisco's Design Guide for mVPN

http://www.cisco.com/en/US/tech/tk828/tech_digest09186a00801a64a3.html

This is done with a Multicast GRE Encapsulation rather than MPLS.  Also, 
you have restriction on interVRF redistribution for Unicast traffic if you do 
this.

The easiest way to think about it is; think of your blue and red VRFs as 
completely separate networks made up of separate routers.  If you want to 
connect the blue and red networks to each other and the Internet you need 
to add a separate external router.   This router is a CE to both the blue and 
red networks.  Further, this CE router needs to be the route to the Internet 
for the red and blue networks, and the route between them.  Because, with 
VRFs you don't have separate unicast and multicast tables you need to use 
the Unicast table for your Multicast, at least for now, this may change in 
the 
future.

For our design we have a separate external CE-Border routers interconnect 
to the VRFs using CE-EBGP, the MPLS Cloud is AS65217 and the Border 
routers are AS217 access to the Internet is through the global route table of 
the Border Routers, an internal-border between VRFs is through a separate 
internal-border VRF on the Border Routers.

I suggest liberal application of your favorite alcoholic beverage, keep 
repeating, until it all starts to makes sense. :)

On 1 Feb 2008 debbie fligor wrote:

> We're doing some planning for our next-generation campus core  
> network.  We're planning on using VRFs to provide some specialty  
> services (like a high-speed research network that bypasses the exit  
> firewalls).
> 
> Here's a very simplified version of what we're thinking it will look  
> like:
> 
> 



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