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22-8
Cisco ME 3400 Ethernet Access Switch Software Configuration Guide
OL-9639-06
Chapter 22 Configuring Port-Based Traffic Control
Configuring Port Blocking
These sections contain this configuration information:
• Default Port Blocking Configuration, page 22-8
• Blocking Flooded Traffic on an Interface, page 22-8
Default Port Blocking Configuration
The default is to not block flooding of unknown multicast and unicast traffic out of a port, but to flood
these packets to all ports.
Blocking Flooded Traffic on an Interface
Note 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.
Beginning in privileged EXEC mode, follow these steps to disable the flooding of multicast and unicast
packets out of an interface:
To return the interface to the default condition where no traffic is blocked and normal forwarding occurs
on the port, use the no switchport block {multicast | unicast} interface configuration commands.
This example shows how to block unicast and multicast flooding on a port:
Switch# configure terminal
Switch(config)# interface fastethernet0/1
Switch(config-if)# no shutdown
Switch(config-if)# switchport block multicast
Switch(config-if)# switchport block unicast
Switch(config-if)# end
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
interface interface-id Specify the interface to be configured, and enter interface
configuration mode.
Step 3
no shutdown Enable the port, if necessary. By default, UNIs and ENIs are
disabled, and NNIs are enabled.
Step 4
switchport block multicast Block unknown multicast forwarding out of the port.
Step 5
switchport block unicast Block unknown unicast forwarding out of the port.
Step 6
end Return to privileged EXEC mode.
Step 7
show interfaces interface-id switchport Verify your entries.
Step 8
copy running-config startup-config (Optional) Save your entries in the configuration file.