What command will output the number of packets that are not forwarded by CEF, but instead handled by the CPU?

The command that effectively displays the number of packets not forwarded by the Cisco Express Forwarding (CEF) and instead handled by the CPU is the one that specifically addresses the packets that bypass CEF. When utilizing a command that references "not-cef-switched," you are specifically requesting information about those packets that did not take advantage of the CEF path and instead required CPU intervention for processing.

This capability is critical for network troubleshooting and performance analysis, as packets that are processed by the CPU rather than being switched by CEF can lead to congestion and reduced performance on a router. By identifying these packets, administrators can investigate why CEF is not handling them, which may include examining issues like routing protocols or access control lists not being optimized for CEF.

The other commands available do not provide the specific information needed about packets not being forwarded by CEF. Instead, they may offer broader details about CEF operation or system performance metrics, rather than the specific count of those packets handled by the CPU.