'ip route show cache' shown nothing

From: Drunkard Zhang
Date: Wed Mar 20 2013 - 22:12:06 EST

I noticed that the behavior of 'ip route show cache' changed in recent
version of iproute2 with recent kernel, it shown nothing now, but it
still exists in 'man ip-route'.

Is this function dropped now? How could I find out routing cache or
FIB in recent kernel?

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