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Community Member

multicast on the lan and igmp snooping

Hi all

on most catalyst switches, is IGMP enabled by default, I hear that the switch only forwards traffic to ports that are in a group, my question is, does the switch try to listen to memberships for all multicast traffic and only send to them ports for that group? or does traffic still get flooded to all ports on the lan ?

how do i check this ?

1 REPLY
Cisco Employee

multicast on the lan and igmp snooping

Hi Carl,

I hope this document will answer your question:

http://www.cisco.com/en/US/tech/tk828/technologies_tech_note09186a0080122a70.shtml

There are links in the document to the different models implementations too.

Please rate helpful answers.

Best regards,

Alex

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