The HP FlexFabric Switch must have all trunk links enabled statically.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-66081	HFFS-L2-000022	SV-80571r1_rule		Medium

Description
When trunk negotiation is enabled via Dynamic Trunk Protocol (DTP), considerable time can be spent negotiating trunk settings (802.1q or ISL) when a node or interface is restored. While this negotiation is happening, traffic is dropped because the link is up from a layer 2 perspective. Packet loss can be eliminated by setting the interface statically to trunk mode, thereby avoiding dynamic trunk protocol negotiation and significantly reducing any outage when restoring a failed link or switch.

Description

When trunk negotiation is enabled via Dynamic Trunk Protocol (DTP), considerable time can be spent negotiating trunk settings (802.1q or ISL) when a node or interface is restored. While this negotiation is happening, traffic is dropped because the link is up from a layer 2 perspective. Packet loss can be eliminated by setting the interface statically to trunk mode, thereby avoiding dynamic trunk protocol negotiation and significantly reducing any outage when restoring a failed link or switch.

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

Details

Check Text ( C-66725r1_chk )
Review the HP FlexFabric Switch configuration to verify that trunk negotiation is disabled by statically configuring all trunk links. Configuring a command to manually disable negotiation may also be required for some switch platforms. If trunk negotiation is enabled on any interface, this is a finding. Sample output: interface GigabitEthernet1/0/1 port link-type trunk port trunk permit vlan X

Fix Text (F-72157r1_fix)
Configure the HP FlexFabric Switch to enable trunk links statically. [HP-GigabitEthernet1/0/1]port link-type trunk