STIGQter: STIG Summary: Cisco IOS XR Router RTR Security Technical Implementation Guide Version: 2 Release: 1 Benchmark Date: 23 Oct 2020:

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

DISA Rule

SV-216798r531087_rule

Vulnerability Number

V-216798

Group Title

SRG-NET-000193-RTR-000002

Rule Version

CISC-RT-000700

Severity

CAT II

CCI(s)

• CCI-001095 - The information system manages excess capacity, bandwidth, or other redundancy to limit the effects of information flooding types of denial of service attacks.

Weight

10

Fix Recommendation

Configure storm control for each CE-facing interface as shown in the example below.

RP/0/0/CPU0:R3(config)#l2vpn
RP/0/0/CPU0:R3(config-l2vpn)#bridge group L2GROUP
RP/0/0/CPU0:R3(config-l2vpn-bg)# bridge-domain L2_BRIDGE_COI1
RP/0/0/CPU0:R3(config-l2vpn-bg-bd)#interface GigabitEthernet0/0/0/2
RP/0/0/CPU0:R3(config-l2vpn-bg-bd-ac)#storm-control broadcast kbps 1200
RP/0/0/CPU0:R3(config-l2vpn-bg-bd-ac)#storm-control multicast kbps 1200
RP/0/0/CPU0:R3(config-l2vpn-bg-bd-ac)#storm-control unknown-unicast kbps 1200
RP/0/0/CPU0:R3(config-l2vpn-bg-bd-ac)#end

Note: The acceptable range is 10000000 -1000000000 for a gigabit ethernet interface, and 100000000-10000000000 for a ten gigabit interface. Storm control is not supported on most FastEthernet interfaces.

Check Contents

Review the router configuration to verify that storm control is enabled on CE-facing interfaces deploying VPLS as shown in the example below.

bridge group L2GROUP
bridge-domain L2_BRIDGE_COI1
interface GigabitEthernet0/0/0/2
storm-control unknown-unicast kbps 1200
storm-control multicast kbps 1200
storm-control broadcast kbps 1200
split-horizon group
!

If storm control is not enabled at a minimum for broadcast traffic, this is a finding.

Vulnerability Number

V-216798

Documentable

False

Rule Version

CISC-RT-000700

Severity Override Guidance

Review the router configuration to verify that storm control is enabled on CE-facing interfaces deploying VPLS as shown in the example below.

bridge group L2GROUP
bridge-domain L2_BRIDGE_COI1
interface GigabitEthernet0/0/0/2
storm-control unknown-unicast kbps 1200
storm-control multicast kbps 1200
storm-control broadcast kbps 1200
split-horizon group
!

If storm control is not enabled at a minimum for broadcast traffic, this is a finding.

Check Content Reference

M

Target Key

4029

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