UCF STIG Viewer Logo

The HP FlexFabric Switch must have the default VLAN pruned from all trunk ports that do not require it.


Finding ID Version Rule ID IA Controls Severity
V-66089 HFFS-L2-000026 SV-80579r1_rule Medium
The default VLAN (i.e., VLAN 1) is a special VLAN used for control plane traffic such as Spanning-Tree Protocol (STP), Dynamic Trunking Protocol (DTP), VLAN Trunking Protocol (VTP), and Port Aggregation Protocol (PAgP). VLAN 1 is enabled on all trunks and ports by default. With larger campus networks, care needs to be taken about the diameter of the STP domain for the default VLAN. Instability in one part of the network could affect the default VLAN, thereby influencing control-plane stability and therefore STP stability for all other VLANs.
HP FlexFabric Switch L2S Security Technical Implementation Guide 2018-12-21


Check Text ( C-66733r1_chk )
Review the HP FlexFabric Switch configuration and verify that the default VLAN is pruned from trunk links that do not require it.

If the default VLAN is not pruned from trunk links that should not be transporting frames for the VLAN, this is a finding.

display vlan 1

VLAN type: Static
Route interface: Configured
Description: VLAN 0001
Name: VLAN 0001
Tagged ports: None
Untagged ports:
GigabitEthernet1/0/1 GigabitEthernet1/0/2
GigabitEthernet1/0/3 GigabitEthernet1/0/4
GigabitEthernet1/0/5 GigabitEthernet1/0/6
GigabitEthernet1/0/7 GigabitEthernet1/0/8
Fix Text (F-72165r1_fix)
Remove the native vlan from trunks that do not require it.

[HP-interface GigabitEthernet1/0/1] undo port trunk permit vlan 1