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The Cisco PE switch providing Virtual Private LAN Services (VPLS) must be configured to have traffic storm control thresholds on CE-facing interfaces.


Overview

Finding ID Version Rule ID IA Controls Severity
V-221123 CISC-RT-000700 SV-221123r622190_rule Medium
Description
A traffic storm occurs when packets flood a VPLS bridge, creating excessive traffic and degrading network performance. Traffic storm control prevents VPLS bridge disruption by suppressing traffic when the number of packets reaches configured threshold levels. Traffic storm control monitors incoming traffic levels on a port and drops traffic when the number of packets reaches the configured threshold level during any one-second interval.
STIG Date
Cisco NX-OS Switch RTR Security Technical Implementation Guide 2021-03-29

Details

Check Text ( C-22838r409858_chk )
Review the switch configuration to verify that storm control is enabled on CE-facing interfaces deploying VPLS as shown in the example below:

interface Ethernet2/4
no shutdown
no switchport
storm-control broadcast level 40.00
service instance 1 ethernet
encapsulation dot1q 100

If storm control is not enabled at a minimum for broadcast traffic, this is a finding.
Fix Text (F-22827r409859_fix)
Configure storm control for each CE-facing interface as shown in the example below:

SW1(config)# int e2/4
SW1(config-if)# storm-control broadcast level 40
SW1(config-if)# end