Cisco WS-C2950T-24 Software Guide - Page 203
Disabling Storm Control, Blocking Flooded Traffic on a Port, Resuming Normal Forwarding on a Port
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Chapter 7 Configuring the Switch Ports Configuring Flooding Controls Disabling Storm Control Beginning in privileged EXEC mode, follow these steps to disable broadcast-storm control: Step 1 Step 2 Step 3 Step 4 Step 5 Command Purpose configure terminal Enter global configuration mode. interface interface Enter interface configuration mode, and enter the port to configure. no port storm-control broadcast Disable port storm control. end Return to privileged EXEC mode. show port storm-control [interface] Verify your entries. Blocking Flooded Traffic on a Port By default, the switch floods packets with unknown destination MAC addresses to all ports. Some configurations do not require flooding. For example, a port that has only manually assigned addresses has no unknown destinations, and flooding serves no purpose. Therefore, you can disable the flooding of unicast and multicast packets on a per-port basis. Ordinarily, flooded traffic does not cross VLAN boundaries, but multi-VLAN ports flood traffic to all VLANs they belong to. Beginning in privileged EXEC mode, follow these steps to disable the flooding of multicast and unicast packets to a port: Step 1 Step 2 Step 3 Step 4 Step 5 Step 6 Command configure terminal interface interface port block multicast port block unicast end show port block {multicast | unicast} interface Purpose Enter global configuration mode. Enter interface configuration mode, and enter the port to configure. Block unknown multicast forwarding to the port. Block unknown unicast flooding to the port. Return to privileged EXEC mode. Verify your entries, entering the appropriate command once for the multicast option and once for the unicast option. Resuming Normal Forwarding on a Port Beginning in privileged EXEC mode, follow these steps to resume normal forwarding on a port: Step 1 Step 2 Step 3 Step 4 Command configure terminal interface interface no port block multicast no port block unicast Purpose Enter global configuration mode. Enter interface configuration mode, and enter the port to configure. Enable unknown multicast forwarding to the port. Enable unknown unicast flooding to the port. 78-6511-08 Catalyst 2900 Series XL and Catalyst 3500 Series XL Software Configuration Guide 7-5