The Arista router must be configured to have all inactive interfaces disabled.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-256001	ARST-RT-000150	SV-256001r882345_rule		Low

Description

An inactive interface is rarely monitored or controlled and may expose a network to an undetected attack on that interface. Unauthorized personnel with access to the communication facility could gain access to a router by connecting to a configured interface that is not in use. If an interface is no longer used, the configuration must be deleted and the interface disabled. For sub-interfaces, delete sub-interfaces that are on inactive interfaces and delete sub-interfaces that are themselves inactive. If the sub-interface is no longer necessary for authorized communications, it must be deleted.

STIG	Date
Arista MLS EOS 4.2x Router Security Technical Implementation Guide	2023-01-17

Details

Check Text ( C-59677r882343_chk )
Review the Arista router configuration. Verify the interfaces and sub-interfaces execute the commands "show ip interface brief" and "show interface status". Example of a disabled interface: interface Ethernet 8-10 description The interface is administratively shutdown shutdown If an interface is not being used but is configured or enabled, this is a finding.

Fix Text (F-59620r882344_fix)
Delete inactive sub-interfaces and disable and delete the configuration of any inactive ports on the router. Deleting the sub-interface: router(config)#no interface Ethernet8.100 Disabling the interface: router(config)#interface Ethernet 8-10 router(config-if-Et8-10)#shutdown Resetting the interface to the default-configuration: router(config)#default interface Ethernet 8