Cisco 2950 Software Configuration Guide - Page 456

Configuring Protected Ports Chapter 22 Configuring Port-Based Traffic Control 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. Data traffic cannot be forwarded between protected ports at Layer 2; only control traffic, such as PIM packets, is forwarded because these packets are processed by the CPU and forwarded in software. All data 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. • Protected ports are supported on 802.1Q trunks. The default is to have no protected ports defined. You can configure protected ports on a physical interface or an EtherChannel group. 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 Cisco 575 LRE CPE or a Cisco 576 LRE 997 CPE device, the cpe protected interface configuration command is not available. When you use a Cisco 585 LRE CPE device (which has multiple Ethernet interfaces), the switchport protected command allows devices on different ports of the same CPE device to exchange data locally. In some cases, you might want to protect individual CPE device ports. You can do this with the cpe protected interface configuration command. Devices connected to different ports on the same CPE device cannot exchange data directly but must forward it through a Layer 3 device. 22-4 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 78-11380-10