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


Finding ID Version Rule ID IA Controls Severity
V-66081 HFFS-L2-000022 SV-80571r1_rule Medium
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.
HP FlexFabric Switch L2S Security Technical Implementation Guide 2020-06-03


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