Multicast Internet Route table.

Tue Sep 2 15:43:16 UTC 2014

On 09/02/2014 05:46 AM, John Kristoff wrote:
> On Tue, 2 Sep 2014 04:47:37 +0000
> "S, Somasundaram (Somasundaram)" <somasundaram.s at alcatel-lucent.com>
> wrote:
> 
>> 1: Does all the ISP's provide Multicast Routing by
>> default?
> 
> No not all and even those that do often do not do so on the same gear,
> links and peers as their unicast forwarding.

Why would that be, are network devices not able to support multicast?

I have never used interdomain multicast but I imagine the global
m-routing table would quickly become large.