This command is a layer-2 command , its intended to block all Unknown unicast frames recieved by a Switch port, its usually used in conjunction with (Switch port protected) command.
If you want to block ALL unicast packet and allow only multicast on a a layer-3 interface, your ACL should look like this:
access-list 10 deny 0.0.0.0 184.108.40.206
access-list 10 permit any.
The above ACL would block all unicast message and allow only multicast subnet range. However as I said, the command you specified is used to block all UNKNOWN unicast frames and not all unicast frames.
We are pleased to announce availability of Beta software for 16.6.3.
16.6.3 will be the second rebuild on the 16.6 release train targeted
towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are
looking for early feedback from customers befor...
Introduction Featured Speakers Luis Espejel is the Telecommunications
Manager of IENova, an Oil & Gas company. Currently he works with Cisco
IOS® and Cisco IOS XE platforms, and NX to some extent. He has also
worked as a Senior Engineer with the Routing P...
In this session you can learn more about Layer 3 multicast and the best
practices to identify possible threats and take security measures. It
provides an overview of basic multicast, the best security practices for
use of this technology, and recommendati...