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18-3
Catalyst 2950 Desktop Switch Software Configuration Guide
78-14982-01
Chapter 18 Configuring Port-Based Traffic Control
Configuring Protected Ports
Disabling Storm Control
Beginning in privileged EXEC mode, follow these steps to disable storm control:
Configuring Protected Ports
Some applications require that no traffic be forwarded between ports on the same switch so that one
neighbor does not see the traffic generated by another neighbor. In such an environment, the use of
protected ports ensures that there is no exchange of unicast, broadcast, or multicast traffic between these
ports on the switch.
Protected ports have these features:
• A protected port does not forward any traffic (unicast, multicast, or broadcast) to any other port that
is also a protected port. Traffic cannot be forwarded between protected ports at Layer 2; all traffic
passing between protected ports must be forwarded through a Layer 3 device.
• Forwarding behavior between a protected port and a nonprotected port proceeds as usual.
The default is to have no protected ports defined.
You can configure protected ports on a physical interface (for example, Gigabit Ethernet 0/1) or an
EtherChannel group (for example, port-channel 5). When you enable protected ports for a port channel,
it is enabled for all ports in the port-channel group.
Both LRE interface ports and CPE device ports can be configured as protected ports. When you use a
CPE 575, the cpe protected command is not available.
When you use a CPE 585 (which has multiple Ethernet interfaces), the switchport protected command
allows devices on different ports of the same CPE 585 to exchange data locally.
In some cases, you might want to protect individual CPE device ports. You can do this with the cpe
protected command. Devices connected to different ports on the same CPE cannot exchange data
directly between each other without being forwarded by an Layer 3 device.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
interface interface-id Specify the port to configure, and enter interface configuration mode.
Step 3
no storm-control {broadcast |
multicast | unicast} level
Disable port storm control.
Step 4
no storm-control action {shutdown |
trap}
Disable the specified storm control action.
Step 5
end Return to privileged EXEC mode.
Step 6
show storm-control {broadcast |
multicast | unicast}
Verify your entries.
Step 7
copy running-config startup-config (Optional) Save your entries in the configuration file.