7-5
Catalyst 2900 Series XL and Catalyst 3500 Series XL Software Configuration Guide
78-6511-08
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:
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:
Resuming Normal Forwarding on a Port
Beginning in privileged EXEC mode, follow these steps to resume normal forwarding on a port:
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
interface interface Enter interface configuration mode, and enter the port to configure.
Step 3
no port storm-control broadcast Disable port storm control.
Step 4
end Return to privileged EXEC mode.
Step 5
show port storm-control [interface] Verify your entries.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
interface interface Enter interface configuration mode, and enter the port to configure.
Step 3
port block multicast Block unknown multicast forwarding to the port.
Step 4
port block unicast Block unknown unicast flooding to the port.
Step 5
end Return to privileged EXEC mode.
Step 6
show port block {multicast |
unicast} interface
Verify your entries, entering the appropriate command once for the
multicast option and once for the unicast option.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
interface interface Enter interface configuration mode, and enter the port to configure.
Step 3
no port block multicast Enable unknown multicast forwarding to the port.
Step 4
no port block unicast Enable unknown unicast flooding to the port.
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