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Community Member

blocking multicast on layer 2 3750

I have a 3750-e, without routing or multicast enabled. there are two switch ports which uplink a firewall and router that are supporting multicast. How would one block multicast traffic on ports that don't need multicast and still support multicast, in this case, on the ports that do?

thanks, Kevin

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Accepted Solutions
Hall of Fame Super Blue

Re: blocking multicast on layer 2 3750

Kevin

IGMP snooping should be enabled by default. This is all you really need to meet your requirement -

http://www.cisco.com/en/US/docs/switches/lan/catalyst3750e_3560e/software/release/12.2_46_se/configuration/guide/swigmp.html#wp1089644

Jon

5 REPLIES
Hall of Fame Super Blue

Re: blocking multicast on layer 2 3750

Kevin

Not entirely sure i understand what you are asking. Do you mean you want multicast packets to go through the switch but only on the relevant ports ?

If so you need to turn on IGMP snooping on the 3750-e switch.

If not please clarify.

Jon

Community Member

Re: blocking multicast on layer 2 3750

hi Jon, yes, correct

multicast isn't enabled, but I want to allow it only an couple ports. I found the "switchport block multicast" command, but my boss mentioned to make sure to use igmp snooping. What are the commands for these two options?

thanks, Kevin

Hall of Fame Super Blue

Re: blocking multicast on layer 2 3750

Kevin

IGMP snooping should be enabled by default. This is all you really need to meet your requirement -

http://www.cisco.com/en/US/docs/switches/lan/catalyst3750e_3560e/software/release/12.2_46_se/configuration/guide/swigmp.html#wp1089644

Jon

Community Member

Re: blocking multicast on layer 2 3750

jon, got it, thanks

Hall of Fame Super Gold

Re: blocking multicast on layer 2 3750

"multicast isn't enabled"

What's your IOS and Feature?

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