Skip to content
ATO Pathways
Log In
Overview
Search
Catalogs
SCAP
OSCAL
Catalogs
Profiles
Documents
References
Knowledge Base
Platform Documentation
Compliance Dictionary
Platform Changelog
About
Catalogs
XCCDF
Arista MLS EOS 4.2x L2S Security Technical Implementation Guide
SRG-NET-000512-L2S-000004
The Arista MLS layer 2 switch must enable Unidirectional Link Detection (UDLD) to protect against one-way connections.
The Arista MLS layer 2 switch must enable Unidirectional Link Detection (UDLD) to protect against one-way connections.
An XCCDF Rule
Details
Profiles
Prose
The Arista MLS layer 2 switch must enable Unidirectional Link Detection (UDLD) to protect against one-way connections.
Medium Severity
<VulnDiscussion>In topologies where fiber optic interconnections are used, physical misconnections can occur that allow a link to appear to be up when there is a mismatched set of transmit/receive pairs. When such a physical misconfiguration occurs, protocols such as STP can cause network instability. UDLD is a layer 2 protocol that can detect these physical misconfigurations by verifying that traffic is flowing bidirectionally between neighbors. Ports with UDLD enabled periodically transmit packets to neighbor devices. If the packets are not echoed back within a specific time frame, the link is flagged as unidirectional and the interface is shut down.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls>