Cisco Catalyst 4500 Series - Resuming Normal Forwarding on a Port

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Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
Chapter 64 Port Unicast and Multicast Flood Blocking
Configuring Port Blocking
Resuming Normal Forwarding on a Port
To resume normal forwarding on a port, perform this task:
Command Purpose
Step 1
Switch# configure terminal
Enters global configuration mode.
Step 2
Switch(config)# interface
interface-id
Enters interface configuration mode and enter the type and number of
the switch port interface (GigabitEthernet1/1).
Step 3
Switch(config-if)# no switchport
block multicast
Enables unknown multicast flooding to the port.
Step 4
Switch(config-if)# no switchport
block unicast
Enables unknown unicast flooding to the port.
Step 5
Switch(config)# end
Returns to privileged EXEC mode.
Step 6
Switch# show interface interface-id
switchport
Verifies your entry.
Step 7
Switch# copy running-config
startup-config
(Optional) Saves your entries in the configuration file.