Multicast Stub & IGMP Helper

Written by Rene Molenaar on 19 August 2010. Posted in Multicast

Scenario

Your career started in the 80's as a star in a famous action show, almost 30 years later your career is even more successful as a senior networking engineer. The company you are working for broadcasts old action series by using multicast, one of the branch offices however has performance problems with an old router. You need to make some changes to fix this, because you love it when a plan comes together...

Goal:

All IP addresses have been preconfigured for you.
Configure OSPF on all routers, advertise all networks. Achieve full connectivity.
Configure router Receiver to join the multicast group 224.4.4.4 on it's Fastethernet interface.
Configure dense-mode multicast between router VideoStation and BA.
Configure dense-mode multicast between router BA and Murdock.
Make sure router Receiver can receive the multicast stream, test this by sending a ping to 224.4.4.4 from router VideoStation.
You are not allowed to form a PIM neighbor relationship between router BA and murdock.

IOS:

c3640-jk9s-mz.124-16.bin

Topology:

Video Solution:

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Multicast PIM Sparse Mode

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Comments (9)

nobigdeal
2010-09-04 05:30:13

The following descriptions are conflicted,

Configure dense-mode multicast between router BA and Murdock.

You are not allowed to form a PIM neighbor relationship between router BA and murdock.

ReneMolenaar
2010-09-05 13:58:33

This might sound strange, but the lab is correct.

This Cisco Document will give you a good idea why this is correct:

http://www.cisco.com/en/US/customer/tech/tk828/technologies_tech_note09186a0080094821.shtml#stub

Chi
2010-10-22 10:20:47

Please can some send me a working config of this. A text file would be ok. Kindly send to okwukaic@yahoo.com

ReneMolenaar
2010-10-22 13:52:48

I'll add the final config soon, for now this might help you out. I'll assume you know how the 'normal' multicast works and are struggling with the STUB part:

[Murdock]
ip multicast-routing

int f0/0
ip pim sparse-dense-mode
ip igmp helper-address x.x.x.x (address of router BA)

int s0/0
ip pim sparse-dense-mode

[BA]
int s0/0
ip pim sparse-dense-mode
ip pim neighbor-filter 1

access-list 1 deny y.y.y.y (IP for Murdock)

Good luck for now