Cisco Switching/Routing :: Router 2811 Joining All Multicast Groups?

Oct 31, 2012

I have a switch 2960 with 15 multicast groups (for video) and now I am configuring a router 2811 to send two multicast groups to another network.But despite of there is no client sending join yet, the router is joinning in all multicast group, and because of that the router are not standing all the traffic. why the router is joinning in all multicast groups?How could I choose what groups router will join?
 
Router Config:
ip multicast routing
ip pim bidir-enable 
interface f0/0
description Conected to Multicast Source Network
ip address 10.1.1.1 255.255.255.0
ip pim sparse-dense-mode

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-#- --length-- -----date/time------ path
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...
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151076864 bytes available (105431040 bytes used)
 
Router#
 
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[Code] ...........
 
I did
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Current configuration : 2229 bytes
!
! Last configuration change at 02:21:18 UTC Tue Mar 12 2013
version 15.1
service timestamps debug datetime msec
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[code]....

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!
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[code]....
 
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Code...

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I  start configuring Cisco 2821 router for multicast . First short  description and attached sheme explanation. Let we say  I have small  network with 100 users. One router and Cisco switch 3560. Two VLAN’s,  one for data another for multicast. Data from internet works fine but  now I want to connect multicast servers (or source of more multicast  streams) from another subnet. Router have three interfaces.I expect there should be no problems with multicast configuration, but unfortunately it is not like I expect. What I did ?

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->3560
|
6506 --> 4506 --> 3548
|   |
|    --> 2960
|
4506 --> 2960
|
-->3548
 
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[code]....

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