Re: multicast on some links

[Ahmed A-G Helmy <ahelmy@catarina.usc.edu>]

> Hi!
> 
> I wonder if it is possible to have multicast (Simulator set
> NumberInterfaces 1) on just some links in the topology? Is it hard to
> change the implementation so this will work?

Currently I believe this is not supported (at least for the detailed 
version of multicast not sure about the centralized version)... the 
problem is that multicast uses the unicast routing information to build 
the RPF trees... so if the RPF nbr pointed to by unicast leads to a 
non-multicast router (i.e. node) then multicast will fail... unless you 
ensure convexity of the multicast region, or tunnel over unicast-only 
nodes (which would like simulating the mbone... and is by no means a 
trivial task).. !

Regards,
-A

> 
> / Thomas
> 
> 
>