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Re: Multicast Traffic on Backbones

  • From: Tim Winders
  • Date: Sun Jun 10 13:53:00 2001

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On Sun, 10 Jun 2001, Michael Whisenant wrote:

> On Sat, 9 Jun 2001, Tim Winders wrote:
>
> > AT&T has most/all of their backbone natively multicast enabled and will
> > multicast enable customer access routers upon request.  They do have a
> > setup fee, but no monthly recurring fees.
>
> 	Fundamentally is that not the way that it should be?

Yes, I agree.

> I think that if I were an AT&T customer I am paying for the ability to
> flow bits at whatever speed my link or service contract was permitted.
> It should not depend if those bits are multicast bits or unicast bits.
> Then in my selection of a provider the provider that offered me more
> features for the same dollar would have a larger value and ultimately
> win my decision process.

Again, I agree.  I am struggling with this issue right now.

> > UUnet has two levels of multicast capabilities.  Their "Basic" package is
> > receive only and is free.  Their "Gold" package is full send/receive, but
> > they charge a ton for it.  The basic package seems pretty useless to me.
> > To join a multicast group, you have to be able to send to it, right?
>
> 	If you are wanting to receive multicast traffic of a live event for
> example, no you would not have to send to the multicast group. Your client
> would send an IGMP join request to the (*,Group) and then ultimately receive
> (host, Group) of data. Your clients and routes only need to know that there is
> a host registered to receive the data, then they will not PRUNE the flow.

Thanks, Michael.  I had one other person inform me that JOIN requests are
done with IGMP.  I appreciate the correction.

=== Tim

     **********************************************
        Tim Winders, MCSE, CNE, CCNA
        Associate Dean of Information Technology
        South Plains College
        Levelland, TX  79336

        Phone:	806-894-9611 x 2369
        FAX:	806-894-1549
        Email:	[email protected]
     **********************************************

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