From: Scott Morris (swm@emanon.com)
Date: Fri Jan 23 2004 - 16:52:30 GMT-3
I'm intigued by that scenario all together though. :) The 224.0.0.0/24
multicast group range is a local-link only multicast, which means there
isn't really going to be any IGMP messages anyway! Just a thought!
Q1. Not really any difference. The PC's would try as well.
Q2. Correct.
Q3. The difference with stub routing is that the one router will not
utilize IGMP. That's why I said it depends on the wording of your scenario.
When trying to use IGMP and joining a PIM tree, that's when this would come
into play. If you're looking to block IGMP from hosts and everyone, then an
IGMP filter would likely be more appropriate.
Scott
_____
From: Annu Roopa [mailto:annu_roopa@yahoo.com]
Sent: Friday, January 23, 2004 2:29 PM
To: Scott Morris; 'kasturi cisco'; bsinclair@netmasterclass.net;
wwwjjang@chol.com; ccielab@groupstudy.com
Subject: RE: How Can i drop the IGMP join message ??
Scott/Bob,
Was trying to research some more into this:
If we see the requirement (and hopefully i understand it) it expects us to
filter IGMP join messages for group 224.0.0.1 from some Rx on the vlan being
dropped. Since it is a lan and if there is a reciever on it like a PC, the
3550 should drop the request.
Q1. The 2 solutions that we have seen and doc CD only shows with routers
involved.IS it any different if PC devices are involved ? dont think so.
Q2. IGMP profile prevents/filters IGMP between routers but they will try as
u say ....So the router keeps trying and the 3550 keeps dropping it if
router is connected to port say fa0/1 or whatever... So if we have a 3550
between 2 routers then the 3550 has effectively dropped and blocked the IGMP
joins from the routers.Will the same hold good for PC Rx.
Q3. With IGMP stub routing once again only routers are shown. So is any diff
for PC based Rx at all ? i dont think so.
So what is the difference between the 2 then ? like some adv or disv or one
over the other.
Thanks,
Annu
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