Multicast Internet Route table.

Jeff Tantsura jeff.tantsura at
Tue Sep 2 15:58:16 UTC 2014

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 :))


-----Original Message-----
From: Octavio Alvarez <alvarezp at>
Date: Tuesday, September 2, 2014 at 8:43 AM
To: "nanog at" <nanog at>
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)" <somasundaram.s at>
>> 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.

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