Configuring Small-Frame Arrival Rate - Cisco Catalyst 2928 Software Configuration Manual

Chapter 22 Configuring Port-Based Traffic Control
Command
Step 6
show storm-control [interface-id] [broadcast |
multicast | unicast]
Step 7
copy running-config startup-config
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 Small-Frame Arrival Rate

Incoming VLAN-tagged packets smaller than 67 bytes are considered small frames. They are forwarded
by the switch, but they do not cause the switch storm-control counters to increment.You can configure a
port to be error disabled if small frames arrive at a specified rate (threshold).
You globally enable the small-frame arrival feature on the switch and then configure the small-frame
threshold for packets on each interface. Packets smaller than the minimum size and arriving at a specified
rate (the threshold) are dropped since the port is error disabled.
If the errdisable recovery cause small-frame global configuration command is entered, the port is
re-enabled after a specified time. (You specify the recovery time by using errdisable recovery global
configuration command.)
Beginning in privileged EXEC mode, follow these steps to configure the threshold level for each
interface:
Command
Step 1 configure terminal
Step 2
errdisable detect cause small-frame
Step 3
errdisable recovery interval interval
Step 4 errdisable recovery cause small-frame
Step 5 interface interface-id
OL-23389-01
Purpose
Verify the storm control suppression levels set on the interface for
the specified traffic type. If you do not enter a traffic type,
broadcast storm control settings are displayed.
(Optional) Save your entries in the configuration file.
Purpose
Enter global configuration mode.
Enable the small-frame rate-arrival feature on the switch.
(Optional) Specify the time to recover from the specified
error-disabled state.
(Optional) Configure the recovery time for error-disabled ports to
be automatically re-enabled after they are error disabled by the
arrival of small frames
Enter interface configuration mode, and specify the interface to be
configured.
Catalyst 2928 Switch Software Configuration Guide
Configuring Storm Control
22-5