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V-66081

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

Finding ID
HFFS-L2-000022
Rule ID
SV-80571r1_rule
Severity
Cat II
CCE
(None)
Group Title
SRG-NET-000512-L2S-000005
CCI
CCI-000366
Target Key
(None)
Documentable
No
Discussion

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.

Fix Text

Configure the HP FlexFabric Switch to enable trunk links statically. [HP-GigabitEthernet1/0/1]port link-type trunk

Check Content

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