II - Mission Support Classified
Rules and Groups employed by this XCCDF Profile
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SRG-NET-000193-L2S-000020
Group -
The Arista MLS layer 2 switch must be configured for Storm Control to limit the effects of packet flooding types of denial-of-service (DoS) attacks.
Denial of service is a condition when a resource is not available for legitimate users. Packet flooding distributed DoS (DDoS) attacks are referred to as volumetric attacks and have the objective o...Rule Medium Severity -
SRG-NET-000362-L2S-000021
Group -
The Arista MLS switch must have Root Guard enabled on all switch ports connecting to access layer switches and hosts.
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. Howev...Rule Low Severity -
SRG-NET-000362-L2S-000022
Group -
The Arista MLS layer 2 switch must have BPDU Guard enabled on all switch ports connecting to access layer switches and hosts.
If a rogue switch is introduced into the topology and transmits a Bridge Protocol Data Unit (BPDU) with a lower bridge priority than the existing root bridge, it will become the new root bridge and...Rule Medium Severity -
SRG-NET-000362-L2S-000023
Group -
The Arista MLS switch must have STP Loop Guard enabled on all nondesignated STP switch ports.
The Spanning Tree Protocol (STP) loop guard feature provides additional protection against STP loops. An STP loop is created when an STP blocking port in a redundant topology erroneously transition...Rule Medium Severity -
SRG-NET-000362-L2S-000025
Group -
The Arista MLS layer 2 switch must have DHCP snooping for all user VLANs to validate DHCP messages from untrusted sources.
In an enterprise network, devices under administrative control are trusted sources. These devices include the switches, routers, and servers in the network. Host ports and unknown DHCP servers are ...Rule Medium Severity -
SRG-NET-000362-L2S-000026
Group -
The Arista MLS layer 2 switch must have IP Source Guard enabled on all user-facing or untrusted access switch ports.
IP Source Guard (IPSG) provides source IP address filtering on a layer 2 port to prevent a malicious host from impersonating a legitimate host by assuming the legitimate host's IP address. The feat...Rule Medium Severity -
SRG-NET-000362-L2S-000027
Group -
The Arista MLS layer 2 switch must have Dynamic Address Resolution Protocol (ARP) Inspection (DAI) enabled on all user VLANs.
DAI intercepts Address Resolution Protocol (ARP) requests and verifies that each of these packets has a valid IP-to-MAC address binding before updating the local ARP cache and before forwarding the...Rule Medium Severity -
SRG-NET-000512-L2S-000002
Group -
The Arista MLS layer 2 switch must have IGMP or MLD Snooping configured on all VLANs.
IGMP and MLD snooping provides a way to constrain multicast traffic at Layer 2. By monitoring the IGMP or MLD membership reports sent by hosts within a VLAN, the snooping application can set up Lay...Rule Low Severity -
SRG-NET-000512-L2S-000003
Group -
The Arista MLS layer 2 Arista MLS switch must implement Rapid STP where VLANs span multiple switches with redundant links.
Spanning Tree Protocol (STP) is implemented on bridges and switches to prevent layer 2 loops when a broadcast domain spans multiple bridges and switches and when redundant links are provisioned to ...Rule Medium Severity -
SRG-NET-000512-L2S-000004
Group -
The Arista MLS layer 2 switch must enable Unidirectional Link Detection (UDLD) to protect against one-way connections.
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...Rule Medium Severity
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