[cisco-voip] Multicasting Speakers and Feed IP command

[Ian J. Pitts]

The only way to get from vlan 999 to vlan 10 with multicast is to route it
and that requires multicast routing on the router.

If you are using the 3750 for layer 3 routing you will need to upgrade to an
image that supports it.

You could also add another router to those vlan's and enable multicast
routing and ip pim on those layer 3 interfaces.

Just to clarify the audio path.
When you enable the feed ip dn you are essentially having the cme instruct
the calling phone to send it's audio to a multicast address. The packets are
sourced from the calling phone not the CME. This might be the part that is
causing the confusion.

Hope that helps,
Ian Pitts
Syn-Apps

> From: Robert Kulagowski <rkulagow at gmail.com>
> Date: Fri, 22 Jan 2010 15:59:33 -0700
> To: Ian Pitts <ipitts at Syn-Apps.com>
> Cc: "cisco-voip at puck.nether.net" <cisco-voip at puck.nether.net>
> Subject: Re: [cisco-voip] Multicasting Speakers and Feed IP command
> 
>> Is there anything that needs to be done on the switch side?  The
>> 
>> "int vlan 10" and "int vlan 999" commands on the 3750's don't seem to
>> have any commands relating to multicast.
> 
> I may need to switch to IP SERVICES rather than what I have now.
>