The Arista MLS layer 2 switch must not use the default VLAN for management traffic.
Severity | Group ID | Group Title | Version | Rule ID | Date | STIG Version |
|---|---|---|---|---|---|---|
| medium | V-255983 | SRG-NET-000512-L2S-000010 | ARST-L2-000200 | SV-255983r991777_rule | 2025-02-20 | 2 |
| 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. |
| ℹ️ Check |
|---|
| 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 |
|---|
| 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 |