switchort block multicast

From: simon hart (simon@harttel.com)
Date: Sat Sep 03 2005 - 10:10:37 GMT-3

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Hi All,

I am trying to understand the validity of this command. This command blocks
unknown multicast traffic.

If IGMP snooping is enabled on a switch, then surely this command is not
necessary. My understanding is that with igmp snooping unless a reciever on
a port has specifically joined a group then multicast traffic will not be
forward from that port.
If a reciever joins a group then the port will forward the mcast stream by
virtue of the fact it now has a known mac address to deliver too.

Therefore would this command be only used when igmp snooping is disabled

Thanks

Simon

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