Debug ip packet details

Hi Dear Friends,

 

When i am debugging ICMP traffic originating from a router using debug ip packet detail command it is showing the packet is routed via FIB and the ICMP reply is showing routed via RIB. I disabled the CEF globally using no ip cef and after that both ICMP request and reply packet is showing routed via RIB

 

is this means that the packet is originating from a router was CEF switching ? if it is ,then how the cef switched packet can be debugged ?

 

Thanks in advance

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