[152645] in North American Network Operators' Group
Re: mulcast assignments
daemon@ATHENA.MIT.EDU (Jeff Tantsura)
Fri May 4 21:01:38 2012
From: Jeff Tantsura <jeff.tantsura@ericsson.com>
To: Marshall Eubanks <marshall.eubanks@gmail.com>
Date: Fri, 4 May 2012 21:00:47 -0400
In-Reply-To: <CAJNg7VKR7MpfFy4MA+7xxkN0-c45hCvQMJH8FhCdW4PtrvkBEw@mail.gmail.com>
Cc: "nanog@nanog.org" <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
Marshall,
That's exactly what the feature does, when it receives a IGMPv1/2 join it a=
dds a preconfigured S and sends S,G (INCLUDE)upstream.
Google for IGMP mapping
Regards,
Jeff
On May 4, 2012, at 1:45 PM, "Marshall Eubanks" <marshall.eubanks@gmail.com>=
wrote:
> On Fri, May 4, 2012 at 2:53 AM, Jeff Tantsura
> <jeff.tantsura@ericsson.com> wrote:
>> Hi,
>>=20
>> All modern routers support mapping from IGMPv2 to PIM SSM, all static, s=
ome others thru DNS, etc
>=20
> I am not sure what you mean here. To support SSM, you need IGMPv3. Most
> routers do support IGMPv3, but there is still a fair amount of legacy
> gear at various
> edges which doesn't.
>=20
> Regards
> Marshall
>=20
>>=20
>> Regards,
>> Jeff
>>=20
>> On May 3, 2012, at 12:34 PM, "Nick Hilliard" <nick@foobar.org> wrote:
>>=20
>>> On 03/05/2012 21:00, Greg Shepherd wrote:
>>>> Sure, but GLOP predated SSM, and was really only an interim fix for
>>>> the presumed need of mcast address assignments. GLOP only gives you a
>>>> /24 for each ASN where SSM gives you a /8 for every unique unicast
>>>> address you have along with vastly superior security and network
>>>> simplicity.
>>>=20
>>> SSM is indeed a lot simpler and better than GLOP in every conceivable w=
ay -
>>> except vendor support. It needs igmpv3 on all intermediate devices and=
SSM
>>> support on the client device. All major desktop operating systems now =
have
>>> SSM support (OS/X since 10.7/Lion), but there is still lots of older
>>> hardware which either doesn't support igmpv3 or else only supports it i=
n a
>>> very primitive fashion. This can lead to Unexpected Behaviour in naive
>>> roll-outs.
>>>=20
>>> Nick
>>>=20
>>=20
