Multicast on 4500 Core Switch and 3750x IDF switches

[Joel Petralia]

At our site we have a 4510 core switch and 3750x switches in our IDFs. The 3750 switches are connected to the core via DOT1Q trunks in a server client setup. We are putting in an Informacast/Berbee server witch will send pages and text to the cisco phones. We also have 1 3750 switch connecting to the core via a layer 3 port channel. If we put the Informacast server on the phones vlan would I just need to enable ip pim sparse-dense mode on that vlan only and enable multicast routing, ip multicast routing? Would I also need ip pim send-rp-announce command also?

Any help would be greatly appreciated,

[Edison Ortiz]

On such a small setup, I recommend going with Static RP (ip pim rp-address x.x.x.x) instead of Auto-RP (ip pim send-rp-announce).

If all your Multicast sources are originating from the same segment, we suggest assigning the closest L3 device to that segment as the RP.

Regards,

Edison

[Joel Petralia]

On the 4510 switch we have our voice vlan (232)10.X.X.1 /24. We are putting the informact server on that vlan. Then we have 9 IDF 3750 switches connecting to the 4510 via dot1q trunks (server, client). We have two swtches stacked that have a layer 3 port channel to the 4510. The IP on the port channel on the 4510 is 10.60.X.1 /30. On the 3750 is the .2. So what I understand is I don't have to enable multicast on the 3750 switches that are connecting via a dot1q trunk? But would need to enable multicast routing on the 4510 and the 3750 switch that has the layer 3 port channel. Would the below config work?

4510-

ip multicast-routing

!

interface vlan 232

description voice vlan

10.X.X.1 255.255.255.0

ip pim sparse-dense-mode

!

interface PO1

ip address 10.60.X.1 255.255.255.252

ip pim sparse-dense mode

!

ip pim rp-address 10.X.X.1 (VOICE VLAN)

____________________________________________

3750 with port channel

ip mutlicast routing

!

interface po1

desc connects to 4510

ip address 10.60.X.2 255.255.255.252

ip pim sparse-dense mode

!

interface vlan 50

description voice vlan

ip address 10.X.232.1 255.255.255.0

ip pim sparse-dense mode

Thanks againg for your help

[Edison Ortiz]

I suggest going with 'pim sparse mode' rather than 'pim sparse-dense mode'

You need to configure the ip pim rp-address on the 3750 as well - same command as 4500 (ip pim rp-address 10.x.x.1)

Last but not least, 3750 will use distributed multicast so the command is ip multicast-routing distributed.

[Joel Petralia]

Thank you for your help, I really appreciate it. I will give this a shot!

[Edison Ortiz · Accepted solution]

Please rate helpful posts and good luck on your deployment!

[Network Admin]

Hi Edison Ortiz    

Can you please give me sample commands for my scenario :-

1. I have Call Manager server and Informacast Paging server connected to core switch (6509) on VLAN 10.

2. My IP Phones are connected to 3750X Access Switches uplinked ( by Trunk )to Core Switch(6509) on VLAN 20.

3. SVI of VLAN 10 on Core Switch is 10.10.10.1 and SVI of VLAN 20 on Core Switch is 10.10.20.1 . 

What are the commands to be added on Core Switch and Access Switches and on which all SVI's or interfaces ?