Detections
Analytics
ARST-L2-000060 - The Arista MLS layer 2 switch must have BPDU Guard enabled on all switch ports connecting to access layer switches and hosts.
Information
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 cause a topology change, rendering the network in a suboptimal state. The STP PortFast BPDU guard enhancement allows network designers to enforce the STP domain borders and keep the active topology predictable. The devices behind the ports that have STP PortFast enabled are not able to influence the STP topology. At the reception of BPDUs, the BPDU guard operation disables the port that has PortFast configured. The BPDU guard transitions the port into a disabled state and sends a log message.NOTE: Nessus has provided the target output to assist in reviewing the benchmark to ensure target compliance.
Solution
The Arista MLS switch provides the capability to configure 'spanning-tree bpduguard'. Configure the Ethernet interface commands:config
interface Ethernet[X]
switch(config)#interface ethernet [X]
switch(config-if-Et[X])#spanning-tree bpduguard enabled
switch(config-if-Et[X])
See Also
https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_Arista_MLS_EOS_4-2x_Y24M07_STIG.zip
Item Details
Audit Name: DISA STIG Arista MLS EOS 4.2x L2S v2r1
Category: SYSTEM AND COMMUNICATIONS PROTECTION
References: 800-53|SC-5, CAT|II, CCI|CCI-002385, Rule-ID|SV-255971r882255_rule, STIG-ID|ARST-L2-000060, Vuln-ID|V-255971
Plugin: Arista
Control ID: cc74d52759fc150ef32056a7fb484adcc2800f0ba0835fc7e63f2fdb0251fe0e