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XCCDF
Cisco IOS XE Switch L2S Security Technical Implementation Guide
SRG-NET-000512-L2S-000005
The Cisco switch must have all trunk links enabled statically.
The Cisco switch must have all trunk links enabled statically.
An XCCDF Rule
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The Cisco switch must have all trunk links enabled statically.
Medium Severity
<VulnDiscussion>When trunk negotiation is enabled via Dynamic Trunk Protocol (DTP), considerable time can be spent negotiating trunk settings (802.1q or ISL) when a node or interface is restored. While this negotiation is happening, traffic is dropped because the link is up from a layer 2 perspective. Packet loss can be eliminated by setting the interface statically to trunk mode, thereby avoiding dynamic trunk protocol negotiation and significantly reducing any outage when restoring a failed link or switch.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls>