![]() ![]() To disable the flooding of multicast and unicast packets to an interface, perform this task:Įnters interface configuration mode and enter the type and number of the switchport interface (GigabitEthernet1/1). When you block multicast or unicast traffic for a port channel, it is blocked on all ports in the port channel group. Note The interface can be a physical interface (for example, GigabitEthernet 1/1) or an EtherChannel group (such as port-channel 5). Note Blocking of unicast or multicast traffic is not automatically enabled on a switch port you must explicitly configure it. To prevent forwarding such traffic, you can configure a port to block unknown unicast or multicast packets. If unknown unicast and multicast traffic is forwarded to a switch port, there might be security issues. Note The flood blocking feature is supported on all switched ports (including PVLAN ports) and is applied to all VLANs on which the port is forwarding.īy default, a switch floods packets with unknown destination MAC addresses to all ports. (This condition is especially undesirable for a private VLAN isolated port.) To guarantee that no unicast and multicast traffic is flooded to the port, use the switch port block unicast and switchport block multicast commands to enable flood blocking on the switch. ![]() Occasionally, unknown unicast or multicast traffic is flooded to a switch port because a MAC address has timed out or has not been learned by the switch. Port Security and Filtering Overview of Flood Blocking ![]()
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