From: Vince Mashburn (cciegroupstudy@gmail.com)
Date: Wed May 30 2007 - 12:15:43 ART
SSM needs a (S,G) entry in order to forward any traffic. So, a multicast
group is no longer identifed by IP addresses in the 224.0.0.0 -
239.255.255.255 range. Using SSM it is defined to be any souce plus the
multicast address combo. In sparse mode, all you need is a group address
and a RP. SSM does 2 things for you.
1) it expands the multicast addressing range becasue (1.1.1.1, 225.1.1.1)
can potentially be a different stream than (2.2.2.2, 225.1.1.1)
2) it allows multicast routing between domains as long as you have a route
to the source.
SSM can run on a sparse-mode network. It only needs to be enabled on the
last-hop routers.
Hope this helps.
On 5/30/07, Ivan <ivan@iip.net> wrote:
>
> ssm can accept flow only from defined source.
> ssm don't need RP.
>
> On Wednesday 30 May 2007 17:51, Kim wrote:
> > Hello all,
> > I am reading the multicast DocCD
> >
> http://www.cisco.com/univercd/cc/td/doc/product/software/ios124/124cg/himc_
> >c/chap05/mcbbasic.htm. Can someone explain or point me to more resources
> > about ip pim sparse-mode vs. ip pim ssm? I can't tell any big
> difference.
> >
> > Thanks.
>
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