I agree with most of what Edison says. But not the part about often is due to incorrect configuration. The ARP timer in IOS is 4 hours and the CAM age timer defaults to 15 minutes. This mismatch exists before the customer starts to configure anything.
There are also situations where asysmetric paths can cause unicast flooding.
some times when mac address table is full, the switch will bwcome as a hub. it broadcast any frame. this is well known attack by flooding the network with unreal MAC address until the mac address table will become full.
Thanks for the feedback, guys. What you're saying makes sense, and it's technically true. It's still misleading that my CCIE R&S book v3 says that this is the default behaviour of a switch, when in fact, you shouldn't see this in production.
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...