MultiCast Network Configuration for Paging Server (Informacast)

[Network Admin]

We have a new setup , where we have  :-

1. Informacast Paging Server in Vlan 10  of Core Switch  ( Paging Server IP : 10.10.10.18 )

    ------ Server Vlan SVI IP Address  -  10.10.10.1 (Core Switch 6509 )

2. IP Phones in Vlan 20 of Access Switches ( 3750 Access Switches Connected to Core Switch 6509 by TRUNK )

    ------  Voice Vlan SVI IP address  - 10.10.20.1 ( on Core Switch 6509 ) and no Voice vlan SVIs on 3750 access Switches.

    ------  3750 Access Switches are connected to 6509 Core Switch by Trunk Port.

Need to configure Multicasting from Paging Server(Vlan 10)  to IP Phones (Vlan 20) . Can anyone give a simple and clear configuration for this ?

[jzellner]

I am working off of the following:

https://www.singlewire.com/wp-multicast-informacast.html

[russ.carter]

I managed to get this working by configuring PIM (passive, sparse or dense mode) on the server and phone VLANs (VLANs 10 and 20 in your case) and configuring a RP address of the SVI in the phone VLAN (ip pim rp 10.10.20.1 in your case) Plus turn on multicast routing of course.

Hope that helps.

[kashif2401]

can you elaborate and give the exact commands which you ran

[Vaijanath Sonvane]

Below is the configuration: 

On Core or Layer-3 Switch:

Core#config t
Core(config)#ip multicast-routing
Core(config)#
Core(config)#interface vlan10
Core(config-if)#ip address 10.10.10.1
Core(config-if)#ip pim sparse-dense-mode
Core(config-if)#ip igmp version 3
Core(config-if)#
Core(config-if)#interface vlan20
Core(config-if)#ip address 10.10.20.1
Core(config-if)#ip pim sparse-dense-mode
Core(config-if)#ip igmp version 3
Core(config-if)#
Core(config-if)#exit
Core(config)#
Core(config)#ip pim rp-address 10.10.10.1
Core(config)#
Core(config)#ip pim rp-candidate vlan20
Core(config)#
Core(config)#end
Core#

Depending on the test results, you may need add below configuration on Layer-2 Switch where IP Phones are connected:

On Layer-2 Switch:

Access#config t
Access(config)#ip igmp snooping
Access(config)#end
Access#