The diagnose command shown in the output is used to display information about NP6 packet

descriptor queues. The output shows that there are 16 NP6 units in total, and each unit has four XAUI

ports (XA0-XA3). The output also shows that there are some non-zero values in the columns PDQ

ACCU (packet descriptor queue accumulated counter) and PDQ DROP (packet descriptor queue drop

counter). These values indicate that there are some packet descriptor queues that have reached their

maximum capacity and have dropped some packets at the XAUI ports. This could be caused by

congestion or misconfiguration of the XAUI ports or the ISF (Internal Switch Fabric). Reference:

https://docs.fortinet.com/document/fortigate/7.0.0/cli-reference/19662/diagnose-np6-pdq

The output is showing a packet descriptor queue accumulated counter, which is a measure of the

number of packets that have been dropped by the NP6 due to congestion. The counter will increase

if there are more packets than the NP6 can handle, which can happen if the bandwidth between the

ISF and the NP is not sufficient or if the HPE shaper is enabled.

The output also shows that there are packet drops at the XAUI, which is the interface between the

NP6 and the FortiGate's backplane. This means that the NP6 is not able to keep up with the traffic

and is dropping packets.

The other statements are not true. Host-shortcut mode is not enabled, and enabling bandwidth

control between the ISF and the NP will not change the output. HPE shaper is a feature that can be

enabled to improve performance, but it will not change the output of the diagnose command.

Reference: https://docs.fortinet.com/document/fortigate/7.4.0/hardwareacceleration/48875/diagnose-npu-np6-dce-np6-id-number-of-dropped-np6-packets