[c-nsp] SSM and multicast IP addresses

[Arie Vayner (avayner)]

Don,

You could always have a static joins on the interface pointing down to
the foundry. This is a worst case scenario of course, but if the
application would require most of the stream to be active most of the
time anyway, this may be a valid solution...

Arie 

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of netman
Sent: Sunday, February 11, 2007 04:55 AM
To: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] SSM and multicast IP addresses

I can't thank this list enough for the responses I have recevied to my
questions. Hopefully I can return some answers in the future.

I did use the wrong terms. Instead of soure I should have used multicast
group. Anyway, testing SSM I had things working with the 232.x.x.x
addresses. So then I decided to try the 224.1.1.x address for SSM using
the 'ip pim ssm  range' command. That worked fine also.

The whole plan is to carry about 480 meg of multicast traffic over the
7600's to each company (7 Foundry's and 1 Cisco 6500). The Cisco is
mine, so I know what I can do with it. I have very little experience on
the Foundry's.
Now my problem is at the edge will be Foundry Big Irons. I have 8 Cisco
7604s' for the transport of the multicast (10 gig between all the
7604's). I am dropping off 1 or 2 gigabit ports to the Foundry's.

I understand the Foundry's will support SSM (but not ssm mapping like
Cisco), but the STB's hanging off the Foundry's do not (they support
IGMPv2). So I need to test and see if the 7604 will take the IGMPv3
request from the Foundry and be able to map it using SSM.
or
I am also wondering if the Foundry's even need to run IGMPv3. I am
wondering if they use igmp static-group commands on the Foundry if that
will be good enough. Of course, I do not have a Foundry chassis to test
with, so I need to work around a production network.

Thanks for the great responses on this list. The details that have been
in everyone's responses has been great!!

Don Hickey

----- Original Message -----
From: "Asbjorn Hojmark - Lists" <lists at hojmark.org>
To: "'netman'" <netman at oneidatel.net>
Cc: <cisco-nsp at puck.nether.net>
Sent: Saturday, February 10, 2007 4:39 PM
Subject: RE: [c-nsp] SSM and multicast IP addresses


>> In order for Source Specific Multicast (SSM) to work properly,
>> does the source addresses need to be in the 232.x.x.x range?
>
> You mean the multicast (not source) addresses?
>
> No, it doesn't need to be 232.0.0.0/8. You can configure another
> range (or in fact several other ranges) using the 'ip pim ssm
> range' command.
>
> 232.0.0.0/8 is reserved for SSM, but if you're planning to talk
> to other networks, consider using 233.0.0.0/8 and GLOP (RFC3180).
>
>> Will SSM work with source addresses in the 224.1.x.x range?
>
> I'm still assuming you mean multicast address (not source),
> because that's what it is.
>
> Yes, SSM will work with 224.1.0.0/16, but you really shouldn't
> use that, as it's reserved for other purposes.
>
> See http://www.iana.org/assignments/multicast-addresses
>
>> Also does anyone know if Foundry supports SSM?
>
> Yes, Foundry supports SSM, but AFAIK not SSM maps like Cisco. So,
> basically, it'll only work with IGMPv3 clients if used at the
> edge.
>
> -A
>
> 

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