From: ccie2be (ccie2be@nyc.rr.com)
Date: Mon Mar 17 2003 - 00:31:18 GMT-3
Hey David,
I did indeed read through the free IPExpert tutorial on the 3550 and as
incredible as this may sound, the write up on MVR was taken word for word
from the 3550 config guide. Hard to believe isn't it?
In any case, what I've been trying to understand is how MVR alters the
normal switch behavior for multicast traffic. Earlier today I posted a note
where I described normal multicast switching behavior that I got from Beau
Williamson book, Developing IP Multicast Networks. BTW, it's an excellent
book if you really want to understand multicast.
What's bothering me, is that I can't understand how MVR is different or
better than the way multicast traffic is normally handled. The way I
understand it, normally when mcast traffic comes into a switch from a router
on it's way to a recipient host, the switch either using igmp snooping or
cgmp adds the port of the host that wants mcast traffic to an entry in the
cam table for that mcast group. It does this so that mcast traffic isn't
flooded to any other ports in the vlan that don't want to receive it.
The only difference I can discern is that with MVR, the mcast traffic comes
into switch on a separate vlan from that of the receiving host. But, so
what?
I'm started to wonder if the real function of this feature is just marketing
hype. What do you think?
Jim
----- Original Message -----
From: "David Porta" <David.Porta003@msd.govt.nz>
To: "Erling Bjontegard" <erli-b@online.no>
Cc: "ccie2be" <ccie2be@nyc.rr.com>; <ccielab@groupstudy.com>
Sent: Sunday, March 16, 2003 7:09 PM
Subject: Re: MVR
> Hi Jim,
>
> Also, I believe you said you were going to purchase the latest IPExpert
> workbook. If you did, in the first page of Chapter 2, you will find the
> URL for the free 3550 tutorial. This tutorial has a section for MVR.
>
> Cheers,
>
> David
>
> >
> > Hi Jim,
> > there is some info about MVR in the doc. for the Catalyst 3550.
> >
http://www.cisco.com/univercd/cc/td/doc/product/lan/c3550/12113ea1/3550scg/s
wigmp.htm#wp1061365
> >
> > Best Regards
> > Erling Bjontegard
> >
> > ----- Original Message -----
> > From: "ccie2be" <ccie2be@nyc.rr.com>
> > To: "Group Study" <ccielab@groupstudy.com>
> > Sent: Sunday, March 16, 2003 6:54 PM
> > Subject: MVR
> >
> > > Hi,
> > >
> > > Is there any white paper or good source of info on MVR, Multicast Vlan
> > > Registration?
> > >
> > > I can't find anything.
> > >
> > > Jim
>
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