The Arista MLS layer 2 switch must not have the default VLAN assigned to any host-facing switch ports.
An XCCDF Rule
Description
<VulnDiscussion>In a VLAN-based network, switches use the default VLAN (i.e., VLAN 1) for in-band management and to communicate with other networking devices 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.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls>
- ID
- SV-255981r991775_rule
- Severity
- Medium
- References
- Updated
Remediation - Manual Procedure
Configure the Arista MLS switch to remove the assignment of the default VLAN from all access switch ports.
Step 1: Configure the Default VLAN 1 to shut down by using the following command:
switch:(config#)interface vlan 1
switch(config-int-vlan1)#shutdown