Cisco Catalyst 2950 Command Reference

2-488
Catalyst 2950 and Catalyst 2955 Switch Command Reference
0L-10102-01
Chapter 2 Catalyst 2950 and 2955 Cisco IOS Commands
storm-control
Command Modes Interface configuration
Command History
Usage Guidelines Use the storm-control command to enable or disable broadcast, multicast, or unicast storm control on
a port. After a port is disabled during a storm, use the no shutdown interface configuration command to
enable the port.
The suppression levels can be entered as a percentage of total bandwidth. A suppression value of
100 percent means that no limit is placed on the specified traffic type. This feature is enabled only when
the rising suppression level is less than 100 percent. If no other storm-control configuration is specified,
the default action is to filter the traffic causing the storm and to send no SNMP trap.
If your switch is a non-LRE Catalyst 2950 switch, the suppression levels can also be entered as the rate
at which traffic is received in packets per second. A suppression value of 4294967295 packets per second
means that no limit is placed on the specified traffic type. This feature is enabled only when the rising
suppression level is less than 4294967295 packets per second. If no other storm-control configuration is
specified, the default action is to filter the traffic causing the storm and to send no SNMP trap.
When a storm occurs and the action is to filter traffic, if the falling suppression level is not specified,
the switch blocks all traffic until the traffic rate drops below the rising suppression level. If the falling
suppression level is specified, the switch blocks traffic until the traffic rate drops below this level.
When a multicast or unicast storm occurs and the action is to filter traffic, the switch blocks all traffic
(broadcast, multicast, and unicast traffic) and sends only Spanning Tree Protocol (STP) packets.
When a broadcast storm occurs and the action is to filter traffic, the switch blocks only broadcast traffic.
The trap and shutdown options are independent of each other.
If you configure the action to be taken when a packet storm is detected as shutdown (the port is
error-disabled during a storm), you must use the no shutdown interface configuration command to bring
the interface out of this state. If you do not specify the shutdown action, specify the action as trap (the
switch generates a trap when a storm is detected).
Examples This example shows how to enable broadcast storm control on a port with a 75.67-percent rising
suppression level:
Switch(config-if)# storm-control broadcast level 75.67
This example shows how to enable multicast storm control on a port with a 87-percent rising suppression
level and a 65-percent falling suppression level:
Switch(config-if)# storm-control multicast level 87 65
This example shows how to enable multicast storm control on a port with a 2000-packets-per-second
rising suppression level and a 1000-packets-per-second falling suppression level on a non-LRE
Catalyst 2950 switch:
Switch(config-if)# storm-control multicast level pps 2000 1000
Release Modification
12.1(6)EA2 This command was introduced. It replaced port storm-control command.
12.1(14)EA1 The pps pps pps-low option was added.
12.1(22)EA2 The pps-low option was made optional.

Cisco Catalyst 2950 Specifications

General

Forwarding Bandwidth	8.8 Gbps
Switching Capacity	13.6 Gbps
Forwarding Rate	6.6 Mpps
Weight	3.6 kg
RAM	16 MB
Flash Memory	8 MB
Operating Humidity	10% to 85% non-condensing
Uplink Ports	2 x 10/100/1000Base-T
Dimensions	4.4 cm x 44.5 cm x 24.2 cm
Remote Management Protocol	SNMP, Telnet, HTTP
Features	Quality of Service (QoS), VLAN support
Compliant Standards	IEEE 802.3, IEEE 802.3u, IEEE 802.1D, IEEE 802.1Q, IEEE 802.1p
Status Indicators	system
Operating Temperature	0 to 45°C
Ports	24 x 10/100 Ethernet ports
MAC Address Table Size	8, 192 entries
Power Supply	Internal 100-240V AC, 50-60Hz