All things related to multicast

[ken lindahl <>]

hi Michael,

On 7/15/2008 11:03 AM Michael Lambert wrote: 
> We are finally planning to bite the bullet and bring up multicast 
> connectivity to both Internet2 and NLR.  We have separate border routers 
> plus a core router.  Do we need to do anything more with the three 
> routers than 1) make sure we have fully-meshed iBGP peering (IPv4 
> multicast NLRI) and 2) configure all three routers in an MSDP mesh 
> group?  Just to keep things amusing, we're running JUNOS, IOS and IOS-XR.

that sounds about right. you don't really need all three roputers
in an MSDP mesh group, only those that are acting as RPs. if all
three are RPs then your statement is correct, but in the topology
you describe, i'd consider running anycast RPs on the border routers
(in an MSFP mesh) and not necessarily on the core router. though
i suppose there's some benefit in having an RP on the core router,
in terms of optimal location of the RP-based (*, G) tree.

that's pretty much what berkeley does, except (i) we have two core
routers, so a slightly more complicated iBGP mesh, and (ii) our
border routers (both JUNOS) both peer with the CalREN networks
rather than directly with Internet2 and NLR.

ken