The Arista MLS layer 2 switch must not use the default VLAN for management traffic.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-255983	ARST-L2-000200	SV-255983r991777_rule	CCI-004931	medium
Description
Switches use the default VLAN (i.e., VLAN 1) for in-band management and to communicate with directly connected switches using Spanning-Tree Protocol (STP), Dynamic Trunking Protocol (DTP), VLAN Trunking Protocol (VTP), and Port Aggregation Protocol (PAgP)—all untagged traffic. As a consequence, the default VLAN may unwisely span the entire network if not appropriately pruned. If its scope is large enough, the risk of compromise can increase significantly.
STIG			Date
Arista MLS EOS 4.X L2S Security Technical Implementation Guide			2025-05-19

Related Frameworks

1 mapping across 3 frameworks

SCF0 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (1) 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.

BCD-10.4Alternate Communications Channels

1.00

DISA STIG Benchmark (XCCDF)V2R3intersects(normalised)
DISA CCI List2025-01-23equal to(normalised)
SCF Secure Traceability Relationship Mapping (STRM)2026.2equal to

NIST 800-530 mappings

No source states a mapping between these directly.

Also reachable in 2 hops (5) 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.

SC-47Alternate Communications Paths

1.00

DISA STIG Benchmark (XCCDF)V2R3intersects(normalised)
DISA CCI List2025-01-23equal to(normalised)

SC-5(2)Capacity, Bandwidth, and Redundancy

1.00

DISA STIG Benchmark (XCCDF)V2R3intersects(normalised)
DISA STIG Benchmark (XCCDF)V2R1our copyintersects(normalised)
DISA STIG Benchmark (XCCDF)V2R1intersects(normalised)
DISA CCI List2025-01-23equal to(normalised)

SC-7Boundary Protection

1.00

DISA STIG Benchmark (XCCDF)V2R3intersects(normalised)
DISA STIG Benchmark (XCCDF)V2R2our copyintersects(normalised)
DISA STIG Benchmark (XCCDF)V2R2intersects(normalised)
DISA CCI List2025-01-23equal to(normalised)

SC-7(11)Restrict Incoming Communications Traffic

1.00

DISA STIG Benchmark (XCCDF)V2R3intersects(normalised)
DISA STIG Benchmark (XCCDF)V2R1our copyintersects(normalised)
DISA STIG Benchmark (XCCDF)V2R1intersects(normalised)
DISA CCI List2025-01-23equal to(normalised)

SC-7(29)Separate Subnets to Isolate Functions

1.00

DISA STIG Benchmark (XCCDF)V2R3intersects(normalised)
DISA STIG Benchmark (XCCDF)V1R1our copyintersects(normalised)
DISA STIG Benchmark (XCCDF)V1R1intersects(normalised)
DISA CCI List2025-01-23equal to(normalised)

CCI1 mapping

CCI-004931

1.00

DISA STIG Benchmark (XCCDF)V2R3intersects(normalised)

Details

Check Text (C-255983r991777_chk)

Verify the Arista MLS configuration for a Management_Network VRF instance globally on the switch with the following example: switch(config)#sh run | sec vrf ip name-server vrf default 192.168.10.20 ! vrf instance Management_Network ! interface Ethernet12 description MANAGEMENT NETWORK PORT no switchport vrf Management_Network ip address 10.10.40.254/30 ! ip routing vrf Management_Network If the VRF is not configured to prevent the default VLAN from being used to access the switch, this is a finding.

Fix Text (F-59602r882290_fix)

Step 1: Configure the Arista MLS switch for a VRF instance for Management Network access by using the following commands: switch(config)#vrf instance Management_Network switch(config-vrf-Management_Network)#exit Step 2: Configure the Ethernet port for VRF Management_Network and IP address for the management network traffic: switch(config-if-Et12)#vrf Management_Network switch(config-if-Et12)#ip address 10.10.40.254/30 switch(config-if-Et12)#exit