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Catalyst 3750 Metro Switch Command Reference
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Chapter 2 Catalyst 3750 Metro Switch Cisco IOS Commands
storm-control
Defaults
Broadcast, multicast, and unicast storm control are disabled.
The default action is to filter traffic and to not send an SNMP trap.
Command Modes
Interface configuration
Command History
Usage Guidelines
The storm-control suppression level can be entered as a percentage of total bandwidth of the port, as a
rate in packets per second at which traffic is received, or as a rate in bits per second at which traffic is
received.
When specified as a percentage of total bandwidth, a suppression value of 100 percent means that no
limit is placed on the specified traffic type. A value of
level 0 0
means that all broadcast, multicast, or
unicast traffic on that port is blocked. Storm control 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 traps.
Note
When the storm control threshold for multicast traffic is reached, all multicast traffic except control
traffic, such as bridge protocol data unit (BDPU) and Cisco Discovery Protocol (CDP) frames, are
blocked. However, the switch does not differentiate between routing updates, such as Open Shortest Path
First (OSPF) and regular multicast data traffic, so both types of traffic are blocked.
The
trap
and
shutdown
options are independent of each other.
If you configure the action to be taken as shutdown (the port is error-disabled during a storm) when a
packet storm is detected, 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).
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.
action
{
shutdown
|
trap
}
Action taken when a storm occurs on a port. The default action is to filter traffic and
to not send an Simple Network Management Protocol (SNMP) trap.
The keywords have these meanings:
•
shutdown
—Disables the port during a storm.
•
trap
—Sends an SNMP trap when a storm occurs.
Release
Modification
12.1(14)AX
This command was introduced.
12.2(25)EY
The
level
level
[.
level
] options were replaced with the
level
{
level
[
level-low
]
|
pps
pps
[
pps-low
] |
bps
bps
[
bps-low
]}
action
{
shutdown
|
trap
}} options.
