Cisco WS-C2955T-12 User Manual

7-6
Catalyst 2900 Series XL and Catalyst 3500 SeriesXL Software Configuration Guide
78-6511-08
Chapter 7 Configuring the Switch Ports
Configuring Flooding Controls
Enabling a Network Port
Network ports are assigned per VLAN and can reduce flooded traffic on your network. The switch
forwards all traffic with unknown destination addresses to the network port instead of flooding the traffic
to all ports in the VLAN.
When you configure a port as the network port, the switch deletes all associated addresses from the
address table and disables learning on the port. If you configure other ports in the VLAN as secure ports,
the addresses on those ports are not aged. If you move a network port to a VLAN without a network port,
it becomes the network port for the new VLAN.
You cannot change the settings for unicast and multicast flooding on a network port. You can assign only
one network port per VLAN. For the restrictions that apply to a network port, see the “Assigning
Passwords and Privilege Levels” section on page 6-11.
Caution A network port cannot link cluster members.
Beginning in privileged EXEC mode, follow these steps to define a network port:
Disabling a Network Port
Beginning in privileged EXEC mode, follow these steps to disable a network port:
Step 5
end Return to privileged EXEC mode
Step 6
show port block {multicast |
unicast} interface
Verify your entries, entering the appropriate command once for the
multicast option and once for the unicast option.
Command Purpose
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
interface interface Enter interface configuration mode, and enter the port to be configured.
Step 3
port network Define the port as the network port.
Step 4
end Return to privileged EXEC mode.
Step 5
show running-config Verify your entry.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
interface interface Enter interface configuration mode, and enter the port to be configured.
Step 3
no port network Disable the port as the network port.
Step 4
end Return to privileged EXEC mode.
Step 5
show running-config Verify your entry.

Cisco WS-C2955T-12 Specifications

General

Brand	Cisco
Model	WS-C2955T-12
Category	Switch
Language	English