From: Leo Leung (leo0430453@gmail.com)
Date: Tue Oct 07 2008 - 19:57:11 ART
Osamah,
for ip pim stub neighbor the ip igmp helper-address should be
configured on the interface where ip igmp join-group is configured.
The reason being you want router to know that only that interface need
to point to the pim neighbor ip address, since pim neighber is not
peering. So this one is correct
R6
int f1/1
ip igmp helper-address 100.1.20.4
ip igmp joing 236.6.6.6
there's no need to configure ip igmp helper-address on int f1/0,
because there's no user to join. Think of similar case in dhcp, only
the potential users need to know where the indirect server is. You
can also check the link in IOS 12.4; be flexible to search different
IOS versions; chances are if not in here, it got to be somewhere in
doc. if not in configuraton doc, it might be command doc etc.
http://www.cisco.com/en/US/docs/ios/ipmulti/command/reference/imc_04.html#wp1013966
leo
22227 (R&S)
On Tue, Oct 7, 2008 at 10:23 AM, Osamah Shaheen <ShaheenO@maaden.com.sa> wrote:
> Scenario:
> We need to configure R6 as Multicast Stub.
> R6 f1/1 will join the group: 236.6.6.6
> Network ____R4(f1/0: 100.1.20.4) _____ (f1/0:100.1.20.6) R6 (f1/1:100.1.60.6)___ Join group 236.6.6.6
>
> Answer:
> pim sparse-dene mode enable in all interfaces.
>
> R6
> int f1/1
> ip igmp helper-address 100.1.20.4
> ip igmp joing 236.6.6.6
>
> Or (Which interface we need to use this command "Join group interface or both interface are correct ")
>
> int f1/0
> ip igmp helper-address 100.1.20.4
>
> R4
> int f1/0
> ip pim neighbor-filter 1
> access-list 1 deny 100.1.20.6
> DocCD is not clear that issue!!!!
> http://www.cisco.com/en/US/docs/ios/12_2/ip/configuration/guide/1cfmulti.html#wp1003543
> even less information in version 12.4
>
> The issue on Multicast Stub router where to put the igmp helper command?
>
>
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