How to control multicast streaming in switch in one same vlan?

Hi Expert, I have a switch 3560 which has 48 ports. Port1 is connected with video server. I want to multicast the streaming to port 40 to 48 user PC. and other ports do not want to be bothered. All ports are assigned to one vlan. How can I do that ? Thank you.
eemoonAsked:
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Don JohnstonInstructorCommented:
IGMP snooping will limit multicast traffic to the ports which have joined the multicast group. It is on by default on 3560 switches.

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eemoonAuthor Commented:
Hi Thank you so much for your fast reply. So that means after the user in port 40 to 48 just join the group, these users can directly receive it without bothering others like normal multicast, right ?
Don JohnstonInstructorCommented:
Correct.
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eemoonAuthor Commented:
When some document mentioned the issue, they talked a lot about CGMP.  why dont we use it again ? Based on what you talked above, the two ports connecting the end router and the switch do not need to be configured with multicast, right ? Thank you
Don JohnstonInstructorCommented:
CGMP is a Cisco proprietary protocol which is used primarily for switch to switch multicast control. If there's a router involved, multicast routing will need to be configured.
eemoonAuthor Commented:
Thank you so much. It is very helpful
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