Cisco MWR 2941 Installation Manual download pdf (Page 667)

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Cisco MWR 2941 Mobile Wireless Edge Router Release 3.5 Command Reference, Cisco IOS Release 15.1(3)MR

OL-26895-01

Chapter Cisco MWR 2941 Router Command Reference, Release 15.1(3)MR

storm-control

Usage Guidelines Use the storm-control command to enable or disable bandwidth-based or PPS-based broadcast,

multicast, or unicast storm control on a port. If a port is disabled during a storm, use the no form of the

shutdown interface configuration command to enable the port.

The suppression levels are entered as a percentage of total bandwidth or PPS.

At the start of a hard-coded defined time period (10 milliseconds [mSec]) the Cisco MWR 2941 starts

counting the number of bytes or PPS on that interface. With bandwidth-based storm control, when the

number of bytes received causes the traffic to exceed the percentage bandwidth configured on that

interface, traffic is dropped for the remainder of the time period. With PPS-based storm control, when

the number of packets received exceeds the PPS configured on that interface, traffic is dropped for the

remainder of the time period.

For example, if an operator configures the storm control threshold as 10% for a 1000 Mbps port, the

traffic allowed to pass during in 10 mSec is 1000 M*0.1*0.01 bits.

By default, when storm control occurs, traffic is dropped. Optionally, you can configure the router to

shutdown the port on which a storm is occurring or send an SNMP trap by using the action keyword

option.

When configuring traffic storm control support on the Cisco MWR 2941, note the following:

• The Cisco MWR 2941 does not support storm control on a port-channel interface.

• Storm control on the Cisco MWR 2941 does not control protocol data units (PDUs).

• In the show interface counters command output, multicast packets are counted as unicast packets.

• The following SNMP trap message applies to all traffic (broadcast, multicast, and unicast) storm

detection:

%MWR2900_STORM_CONTROL-2-TRAP: Storm control Sending SNMP trap

GigabitEthernet{slot/port}.

• The Cisco MWR 2941 does not support the debugging of traffic storm control.

Examples The following example shows how to enable broadcast storm control on a port with a 75.67 percent rising

suppression level:

Router(config-if)# storm-control broadcast level 75.67

The following example shows how to enable broadcast storm control on a port with a 400000 pps output

rate suppression level:

Router(config-if)# storm-control broadcast level pps 4000000.67

The following example shows how to enable the shutdown action on a port:

12.2(15)ZJ This command was integrated into Cisco IOS Release 12.2(15)ZJ and the

level keyword, the lower-level argument, and the action and shutdown

keywords were added to support the Ethernet switch network module on

Cisco 2600 series, Cisco 3600 series, and Cisco 3700 series routers.

15.1(3)MR This command was integrated into Cisco IOS Release 15.1(3)MR to support

traffic storm control on the Cisco MWR 2941 and the level pps keyword

option was added to support the configuration of PPS-based traffic storm

control on the Cisco MWR 2941.

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