With multicast traffic, the port blocking feature blocks only pure Layer 2 packets. Multicast packets that
contain IPv4 or IPv6 information in the header are not blocked.
Note
How to Configure Port Blocking
Blocking Flooded Traffic on an Interface
Before You Begin
The interface can be a physical interface or an EtherChannel group. When you block multicast or unicast
traffic for a port channel, it is blocked on all ports in the port-channel group.
SUMMARY STEPS
1.
enable
2.
configure terminal
3.
interface interface-id
4.
switchport block multicast
5.
switchport block unicast
6.
end
7.
show interfaces interface-id switchport
8.
show running-config
9.
copy running-config startup-config
DETAILED STEPS
PurposeCommand or Action
Enables privileged EXEC mode. Enter your password
if prompted.
enable
Example:
Switch> enable
Step 1
Enters the global configuration mode.configure terminal
Example:
Switch# configure terminal
Step 2
Consolidated Platform Configuration Guide, Cisco IOS Release 15.2(4)E (Catalyst 2960-X Switches)
1505
How to Configure Port Security
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