Cisco WS-C2960-24TC-S Software Guide - Page 399

Chapter 19 Configuring Port-Based Traffic Control Configuring Protected Ports Step 6 Step 7 Command Purpose show storm-control [interface-id] [broadcast | Verify the storm control suppression levels set on the interface for multicast | unicast] the specified traffic type. If you do not enter a traffic type, broadcast storm control settings are displayed. copy running-config startup-config (Optional) Save your entries in the configuration file. To disable storm control, use the no storm-control {broadcast | multicast | unicast} level interface configuration command. This example shows how to enable unicast storm control on a port with an 87-percent rising suppression level and a 65-percent falling suppression level: Switch# configure terminal Switch(config)# interface gigabitethernet0/1 Switch(config-if)# storm-control unicast level 87 65 This example shows how to enable broadcast address storm control on a port to a level of 20 percent. When the broadcast traffic exceeds the configured level of 20 percent of the total available bandwidth of the port within the traffic-storm-control interval, the switch drops all broadcast traffic until the end of the traffic-storm-control interval: Switch# configure terminal Switch(config)# interface gigabitethernet0/1 Switch(config-if)# storm-control broadcast level 20 Configuring Protected Ports Some applications require that no traffic be forwarded at Layer 2 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. These sections contain this configuration information: • Default Protected Port Configuration, page 19-6 • Protected Port Configuration Guidelines, page 19-6 • Configuring a Protected Port, page 19-6 OL-8603-04 Catalyst 2960 Switch Software Configuration Guide 19-5