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IP Multicasting

I've read through many of the IP Multicasting issues but still can't get mine resolved so I thought I'd give this one more shot.

We have two VLANs on our network (data - VLAN 1, and voice VLAN 23). The core switch is a 4510 and the IDFs are 3560's. I have configured IP MultiCasting on the 4510 and the 3560 I am testing with. VLAN 1 data vlan is subnet 10.0.0.0 and voice (vlan 23) is 10.0.23.0. We have our call manager set up on 10.0.0.176 and our phones all register and work correctly. Have a helper address set up ont he core switch. I have set up each vlan on the core and the 3560 as follows:

interface Vlan1

ip address 10.0.0.175 255.255.255.0

ip pim sparse-dense-mode

!

interface Vlan23

ip address 10.0.23.1 255.255.255.0

ip helper-address 10.0.0.176

ip pim sparse-dense-mode

I have also tried different modes for IP PIM but no success.

This is for a berbee (informacast) paging system that requires multicast. Any assistance would be very much appreciated.

Thanks

2 REPLIES
Bronze

Re: IP Multicasting

I can tell you that Multicast is disabled by default on the 4500. Turn it on with "ip multicast-routing"

Also try these commands to troubleshoot.

"show ip multicast"

"show ip multicast interface"

"show ip pim interface"

"show ip pim neighbor"

"show ip igmp groups"

Silver

Re: IP Multicasting

Also, what are you trying to achieve?

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