From: Stuart Reabow (stuartbr@hotmail.com)
Date: Sun Dec 07 2003 - 18:04:36 GMT-3
Thanks, I've got it now :)
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Bob
Sinclair
Sent: 07 December 2003 19:45
To: Stuart Reabow; ccielab@groupstudy.com
Subject: Re: Multicast question
Stuart,
My 2 cents to get things started:
> I do not believe that cgmp is required on the router to get multicast
> to
work. The 3550 EMI runs IGMP snooping by default, which is a substitute for
cgmp. They both work to make sure that multicast does not flood a vlan, but
only goes out ports in a vlan where there are active receivers. Unless
required by the scenario, neither cgmp nor IGMP snooping is required to get
multicast to work.
> Everything else looks right to me.
-Bob Sinclair
CCIE #10427, CISSP, MCSE
bsinclair@netmasterclass.net
----- Original Message -----
From: "Stuart Reabow" <stuartbr@hotmail.com>
To: <ccielab@groupstudy.com>
Sent: Sunday, December 07, 2003 2:31 PM
Subject: Multicast question
> Hi all,
>
> I've been doing a lot on multicast, but I'm still not sure about a couple
> things. Please could someone confirm the below.
>
> 1) In the following scenario :
>
> sender ---- L2 3550 ------ router ------- L2 3550 -------receiver
>
> No multicast config is required on 3550's
>
> ip cgmp is required on the router interfaces
> pim xxx-mode on router interfaces
> ip multicast-routing enabled on router
>
> 2) In the following scenario :
>
> sender ---- L2 3550 ------ router ------- L3 3550 -------receiver
>
> In this scenario, the second switch is L3, but router/receiver are on the
> same vlan.
>
> Configs are as in first scenario.
>
>
> 3) In the following scenario :
>
> sender ---- L2 3550 ------ router ------- L3 3550 -------receiver
>
> In this scenario, the second switch is L3, with router/receiver are on
> different vlan.
>
> Multicast routing is required on the 3550's.
> pim xxx-mode on vlan interfaces
> No other multicast config is required on 3550's
>
> ip cgmp is required on the router interfaces
> pim xxx-mode on router interfaces
> ip multicast-routing enabled on router
>
> In all three cases IGMP/CGMP configs are not required on the 3550's & ip
> cgmp is required on the router?
>
>
> Thanks in advance
>
> Stuart
>
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