Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
New Member

Constraining multicast traffic in the same vlan

I have a software which delivers OS images to notebooks. The software uses multicast to transfer the image.Now the source and clients are connected directly to a Cisco 4506 switch with Supervisor Engine IV.They are all in the same VLAN.Do I need to configure the switch to make the multicast work properly? and How ? A Router is needed or not ?

4 REPLIES

Re: Constraining multicast traffic in the same vlan

Hi,

read this excellent materials:

http://www.cisco.com/warp/public/473/38.html.

(There are also useful links at the end of it.)

http://www.cisco.com/warp/public/473/22.html

Regards,

Milan

New Member

Re: Constraining multicast traffic in the same vlan

Thanks!

From the document "Constraining Multicast Traffic with Source and Receivers on the Same VLAN on Catalyst Switches", I know that a router is needed in my enviroment. Now,we use the software in real enviroment without a router. It works! From the "show ip igmp groups", we see no multicast groups. From "show interface", we see multicast packets passing through the interface. It really works.

Also, I get a little confused. The 4506 itself is a layer 3 device, why we need another L3 device to make the multicast work ?

Re: Constraining multicast traffic in the same vlan

Hi,

my understanding is that you need a router only when your switches don't recognize IGMP (some CatOS switches, e.g.). The router then provides IGMP to CGMP "translation".

But using IGMP snooping (advanced IOS switches) or L2/L3 switch you don't need additional router while multicast traffic source and receivers are on the same VLAN.

Regards,

Milan

New Member

Re: Constraining multicast traffic in the same vlan

If I use IGMP snooping, do I need a Netflow Service Card ?

772
Views
0
Helpful
4
Replies
CreatePlease to create content