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The Arista MLS layer 2 switch must have all disabled switch ports assigned to an unused VLAN.

Overview

Finding IDVersionRule IDIA ControlsSeverity
V-255980ARST-L2-000170SV-255980r991774_ruleCCI-004891medium
Description
It is possible that a disabled port that is assigned to a user or management VLAN becomes enabled by accident or by an attacker and as a result gains access to that VLAN as a member.
STIGDate
Arista MLS EOS 4.X L2S Security Technical Implementation Guide2025-05-19

Related Frameworks

1 mapping across 3 frameworks
SCF0 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (3) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

CLD-03Cloud Infrastructure Security Subnet
0.50
NET-03.8Separate Subnet for Connecting to Different Security Domains
0.50
NET-06.1Security Management Subnets
0.50
NIST 800-530 mappings

No source states a mapping between these directly.

Also reachable in 2 hops (8) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

AC-17(2)Protection of Confidentiality and Integrity Using Encryption
1.00
AC-3Access Enforcement
1.00
CM-6Configuration Settings
1.00
SC-47Alternate Communications Paths
1.00
SC-7Boundary Protection
1.00
SC-7(11)Restrict Incoming Communications Traffic
1.00
SC-7(29)Separate Subnets to Isolate Functions
1.00
SC-8Transmission Confidentiality and Integrity
1.00
CCI1 mapping
CCI-004891
1.00

Details

Check Text (C-255980r991774_chk)

Step 1: Review the switch configuration and examine all access switch ports. Verify the unused port is configured to be intentionally shut down and assigned to an inactive VLAN. switch(config)#sh run int eth8 interface Ethernet8 description PORT IS INTENTIONALLY SHUTDOWN switchport access vlan 999 shutdown switch(config)# Step 2: Verify traffic from the inactive VLAN is not allowed on any trunk links as shown in the example below: switch(config)#sh run int eth9 interface Ethernet9 switchport trunk native vlan 1000 switchport trunk allowed vlan 2-998, 1001-4094 switchport mode trunk switch(config)# If any access switch ports are not in use and not in an inactive shutdown, this is a finding. Note: Switch ports configured for 802.1x are exempt from this requirement.

Fix Text (F-59599r882281_fix)

Configure all Arista MLS switch ports not in use to be shut down and assigned to an unused VLAN. Step 1: Configure all unused ports to be shut down and assigned to an unused VLAN. switch(config)#interface ethernet 9 switch(config-eth9)#shutdown switch(config-eth9)# description this port is intentionally shutdown switch(config-eth9)# switchport access vlan 999 Step 2: Configure any trunk links to exclude the unused VLAN. switch(config)# interface ethernet 10 switch(config-eth10)# switchport trunk native vlan 1000 switch(config-eth9)# switchport trunk allowed vlan 2-998, 1001-4094 switch(config-eth9)# switchport mode trunk