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XCCDF
Juniper EX Series Switches Layer 2 Switch Security Technical Implementation Guide
SRG-NET-000362-L2S-000021
SRG-NET-000362-L2S-000021
An XCCDF Group - A logical subset of the XCCDF Benchmark
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SRG-NET-000362-L2S-000021
1 Rule
<GroupDescription></GroupDescription>
The Juniper EX switch must be configured to enable Root Protection on all interfaces connecting to access layer switches and hosts.
Low Severity
<VulnDiscussion>Spanning Tree Protocol (STP) does not provide any means for the network administrator to securely enforce the topology of the switched network. Any switch can be the root bridge in a network. However, a more optimal forwarding topology places the root bridge at a specific predetermined location. With the standard STP, any bridge in the network with a lower bridge ID takes the role of the root bridge. The administrator cannot enforce the position of the root bridge but can set the root bridge priority to 0 in an effort to secure the root bridge position. The Root Protection feature provides a way to enforce the root bridge placement in the network. If the bridge receives superior STP Bridge Protocol Data Units (BPDUs) on a Root Protection-enabled interface, Root Protection ignores the superior BPDU and places the interface into block and a root-inconsistent state. To enforce the position of the root bridge it is imperative that Root Protection is enabled on all interfaces where the root bridge should never appear.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls>