Detections
Analytics
ARST-L2-000050 - The Arista MLS switch must have Root Guard enabled on all switch ports connecting to access layer switches and hosts.
Information
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.NOTE: Nessus has provided the target output to assist in reviewing the benchmark to ensure target compliance.
Solution
The Arista MLS switch must be configured for spanning-tree guard root mode on all ports connecting to the access layer interface.Configure Arista MLS switch Ethernet interface with the following commands:
switch#config
switch(config)interface Ethernet[X]
switch(config-if-Et[X])#spanning-tree guard root
switch(config-if-Et[X])#exit
!
See Also
https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_Arista_MLS_EOS_4-2x_Y23M02_STIG.zip
Item Details
Audit Name: DISA STIG Arista MLS EOS 4.2x L2S v1r1
References: CAT|III, CCI|CCI-002385, Rule-ID|SV-255970r882252_rule, STIG-ID|ARST-L2-000050, Vuln-ID|V-255970
Plugin: Arista
Control ID: 61e9f6340c997466999cd7409174fffc29097cde63ca452e307e6681904ebeb8