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

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-66089	HFFS-L2-000026	SV-80579r1_rule		Medium

Description
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.

Description

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.

STIG	Date
HP FlexFabric Switch L2S Security Technical Implementation Guide	2020-06-03

Details

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 ID: 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

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 ID: 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