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

An XCCDF Rule

Description

<VulnDiscussion>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.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls>

ID: SV-255980r991774_rule
Severity: Medium
References: CCI-004891
Updated: 17 days ago

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)#shutdownswitch(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

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

Description

Remediation - Manual Procedure