The Cisco switch must have Storm Control configured on all host-facing switchports.
Severity | Group ID | Group Title | Version | Rule ID | Date | STIG Version |
|---|---|---|---|---|---|---|
| low | V-220636 | SRG-NET-000512-L2S-000001 | CISC-L2-000160 | SV-220636r648763_rule | 2024-06-06 | 3 |
Description
A traffic storm occurs when packets flood a LAN, creating excessive traffic and degrading network performance. Traffic storm control prevents network disruption by suppressing ingress traffic when the number of packets reaches a configured threshold levels.
Traffic storm control monitors ingress traffic levels on a port and drops traffic when the number of packets reaches the configured threshold level during any one-second interval.
ℹ️ Check
Review the switch configuration to verify that storm control is enabled on all host-facing interfaces as shown in the example below:
interface GigabitEthernet0/3
switchport access vlan 12
storm-control unicast level bps 62000000
storm-control broadcast level bps 20000000
Note: Bandwidth percentage thresholds (via level parameter) can be used in lieu of PPS rate.
If storm control is not enabled at a minimum for broadcast traffic, this is a finding.
✔️ Fix
Configure storm control for each host-facing interface as shown in the example below:
SW1(config)#int range g0/2 - 8
SW1(config-if-range)#storm-control unicast bps 62000000
SW1(config-if-range)#storm-control broadcast level bps 20000000
Note: The acceptable range is 10000000 -1000000000 for a gigabit Ethernet interface, and 100000000-10000000000 for a 10-gigabit interface. Storm control is not supported on most FastEthernet interfaces.