Host must filter Bridge Protocol Data Unit (BPDU) packets

MittelStufe 1Automatisiertvmware

Beschreibung

To prevent cascading lockout of uplink interfaces from the ESXi host, the Net.BlockGuestBPDU parameter can be set to 1, enabling BPDU Filter to drop BPDU packets sent from virtual machines to the physical switch. This is crucial as ESXi's Standard and Distributed Virtual Switches do not support STP, making them prone to network loops if BPDUs are unfiltered. The audit reads Net.BlockGuestBPDU with esxcli and requires 1. Runs in the ESXi Shell (busybox sh) as root.

So wird geprüft

Prüfmethode: Shell-Befehl

shell

out=$(esxcli system settings advanced list -o /Net/BlockGuestBPDU 2>/dev/null) || exit 1
v=$(printf '%s\n' "$out" | awk '$1=="Int" && $2=="Value:" {print $3; exit}')
case "$v" in ''|*[!0-9-]*) echo '/Net/BlockGuestBPDU: no integer value'; exit 1 ;; esac
if [ "$v" -eq 1 ]; then echo compliant; else echo "/Net/BlockGuestBPDU = $v (expected 1)"; fi

Erwartete Ausgabe: compliant

So wird behoben

Behebungsmethode: Anleitung oder Infrastruktur-Patch

From an administrative PowerCLI session: Execute - Get-VMHost | Get-AdvancedSetting -Name Net.BlockGuestBPDU | Set-AdvancedSetting - Value 1 -Confirm:$false. Validate network appliances/virtual switching workloads before enforcing this setting.

Eigenschaften

Betriebssysteme: Beliebig
Tags: vmwareesxinetwork
Referenz: CIS VMware ESXi 9.0 Benchmark v1.0.0 - 5.4 Host must filter Bridge Protocol Data Unit (BPDU) packets

Diesen Host prüfen

Führen Sie dies auf einem Rechner aus, den Sie prüfen dürfen. Der Scan ist schreibgeschützt.

shell

tmaegis scan --target vmware