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Layer 2 Switch Security Requirements Guide

Rules, Groups, and Values defined within the XCCDF Benchmark

  • SRG-NET-000362

    <GroupDescription></GroupDescription>
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  • SRG-NET-000362

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  • The layer 2 switch must have Root Guard enabled on all switch ports connecting to access layer switches and hosts.

    &lt;VulnDiscussion&gt;Spanning Tree Protocol (STP) does not provide any means for the network administrator to securely enforce the topology of the...
    Rule Low Severity
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  • SRG-NET-000362

    <GroupDescription></GroupDescription>
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  • The layer 2 switch must have BPDU Guard enabled on all user-facing or untrusted access switch ports.

    &lt;VulnDiscussion&gt;If a rogue switch is introduced into the topology and transmits a Bridge Protocol Data Unit (BPDU) with a lower bridge priori...
    Rule Medium Severity
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  • SRG-NET-000362

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  • The layer 2 switch must have STP Loop Guard enabled on all non-designated STP switch ports.

    &lt;VulnDiscussion&gt;The Spanning Tree Protocol (STP) loop guard feature provides additional protection against STP loops. An STP loop is created ...
    Rule Medium Severity
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  • SRG-NET-000362

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  • The layer 2 switch must have Unknown Unicast Flood Blocking (UUFB) enabled.

    &lt;VulnDiscussion&gt;Access layer switches use the Content Addressable Memory (CAM) table to direct traffic to specific ports based on the VLAN nu...
    Rule Medium Severity
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  • SRG-NET-000362

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  • The layer 2 switch must have all trunk links enabled statically.

    &lt;VulnDiscussion&gt;When trunk negotiation is enabled via Dynamic Trunk Protocol (DTP), considerable time can be spent negotiating trunk settings...
    Rule Medium Severity
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  • SRG-NET-000512

    <GroupDescription></GroupDescription>
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  • The layer 2 switch must have all disabled switch ports assigned to an unused VLAN.

    &lt;VulnDiscussion&gt;It is possible that a disabled port that is assigned to a user or management VLAN becomes enabled by accident or by an attack...
    Rule Medium Severity
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  • SRG-NET-000512

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  • The layer 2 switch must have Dynamic Address Resolution Protocol (ARP) Inspection (DAI) enabled on all user VLANs.

    &lt;VulnDiscussion&gt;DAI intercepts Address Resolution Protocol (ARP) requests and verifies that each of these packets has a valid IP-to-MAC addre...
    Rule Medium Severity
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  • SRG-NET-000512

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  • The layer 2 switch must have Storm Control configured on all host-facing switch ports.

    &lt;VulnDiscussion&gt;A traffic storm occurs when packets flood a LAN, creating excessive traffic and degrading network performance. Traffic storm ...
    Rule Low Severity
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  • SRG-NET-000512

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  • The layer 2 switch must have IGMP or MLD Snooping configured on all VLANs

    &lt;VulnDiscussion&gt;IGMP and MLD snooping provides a way to constrain multicast traffic at Layer 2. By monitoring the IGMP or MLD membership repo...
    Rule Low Severity
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  • SRG-NET-000512

    <GroupDescription></GroupDescription>
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