From: Chen Kwong Wai William (kwchen@netvigator.com)
Date: Sun Nov 02 2003 - 14:18:56 GMT-3
Hi,
Why when Multicast routing is enable on a router, by default, IGMP is
enabled on LAN interfaces? I think we first need to confirm if it is true.
But, as in the DocCD, when you use "ip pim <dense-mode|sparse-mode|
sparse-dense-mode>", the
interface is also enable IGMP. Moreover, I can't find any command to disable
IGMP on an interface, so I think enable or disable PIM/IGMP are done on the
same time.
Please correct me if I am wrong, and anyone knows the detail here?
Best Regards,
William Chen
----- Original Message -----
From: "ccie2be" <ccie2be@nyc.rr.com>
To: "Group Study" <ccielab@groupstudy.com>
Sent: Sunday, November 02, 2003 10:38 PM
Subject: PIM Multicast simple question
> Hi all,
>
> When Multicast is enabled on a router, by default, IGMP is enabled on Lan
> interfaces. That being the case, is it necessary to also enter the
interface
> command,
>
> ip pim <dense-mode|sparse-mode| sparse-dense-mode>,
>
> when there are only multicast hosts attached to that interface and no
> possibility of other routers connecting to that interface?
>
> For example, if you have the following multicast network,
>
> R2------R1(E0)------switch------mcast hosts only
>
> does, ip pim <dense-mode|sparse-mode| sparse-dense-mode>
>
> need to be entered on the E0 interface of R1? Please explain why or why
not.
>
> Thanks, dt
>
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