[cisco-voip] Setting ip Multicast for MOH

[Ryan Ratliff]

With pim sparse-dense mode the router will try to do sparse mode 
(multicast is only forwarded to hosts that explicitly join the group).  
If the sparse-mode fails however it will drop to dense mode (multicast 
is flooded everywhere).  With a minimal sparse-dense mode setup I would 
go ahead and only route the specific groups you wish to go over the 
wan.  You never know when somebody will put some app on their pc that 
could end up sending a 100k stream to all your remote sites.

-Ryan
On Apr 18, 2005, at 4:42 PM, King, Jesse wrote:

Only one hop,
 
source-----router-----router-----switch----phone
 
I found an interesting document, which pretty much lines it out, and I 
have one site with it setup and working.
 
I'm using the following on the source router
 
ip multicast-routing
ip pim bsr-candidate FastEthernet0/0 30 1
 
interface fasteth 0/0
ip pim sparse-dense-mode
 
interface xxxx  to branch router
ip pim sparse-dense-mode
 
 
 
on the branch router
 
ip multicast-routing
interface fasteth 0/0
ip pim sparse-dense-mode
 
interface xxxx  to hq router
ip pim sparse-dense-mode
 
 
seems to be working okay.. Should I be limiting to just one group? I 
think I am seeing multicasts from wireless accesspoints and a few other 
devices for some reason.....
 
 
 


From: Kevin Thorngren [mailto:kevint at cisco.com]
  Sent: Monday, April 18, 2005 4:35 PM
To: King, Jesse
Cc: cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] Setting ip Multicast for MOH

Hi Jesse,


  What is your goal with the Multicast MoH?


  Are you needing the Multicast traffic to go further than the directly 
connected subnets?


  Kevin
  On Apr 18, 2005, at 3:14 PM, King, Jesse wrote:


  Okay -
I have 1760-v's in branches connected to 3550's.
On branch routers, in order to setup multicast routing

ip multicast-routing
and under the interface - serial? or fast eth?

ip pim dense-mode
Is this all I need, or do I need to set the router to be in a 
particular group. We are not using multicast for anything else.
I am in the process of reading 'Configuring IP Multicast Routing', and 
it says those two commands are required, others are optional.. Is that 
really the case? and if so, which interface do I need to have the ip 
pim set on, and is dense-mode the correct mode I should be using?
Thoughts?
Thanks.
Jesse
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