It is not the network devices per se, it is additional configuration, security, MSDP peering, etc, i.e. OPEX
Business justification for such effort is not obvious, (most of multicast deployments I have done in my previous life were because I loved the technology, not because of business needs :)) Cheers, Jeff -----Original Message----- From: Octavio Alvarez <alvar...@alvarezp.ods.org> Date: Tuesday, September 2, 2014 at 8:43 AM To: "nanog@nanog.org" <nanog@nanog.org> Subject: Re: Multicast Internet Route table. >On 09/02/2014 05:46 AM, John Kristoff wrote: >> On Tue, 2 Sep 2014 04:47:37 +0000 >> "S, Somasundaram (Somasundaram)" <somasundara...@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.
