Cisco 2950G 24 Software Configuration Guide - Page 417

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: Step 1 Step 2 Step 3 Step 4 Step 5 Step 6 Step 7 Command configure terminal interface interface-id no storm-control {broadcast | multicast | unicast} level no storm-control action {shutdown | trap} end show storm-control {broadcast | multicast | unicast} copy running-config startup-config Purpose Enter global configuration mode. Specify the port to configure, and enter interface configuration mode. Disable port storm control. Disable the specified storm control action. Return to privileged EXEC mode. Verify your entries. (Optional) Save your entries in the configuration file. 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. 78-14982-01 Catalyst 2950 Desktop Switch Software Configuration Guide 18-3