[c-nsp] what happens when the PFC3A fib gets full?

Andrew Fort afort at choqolat.org
Mon Feb 20 19:22:45 EST 2006


okay, so idiot mode on here: so, what happens when the FIB TCAM gets full..

box#show ip cef sum | i routes
  180434 routes, 0 reresolve, 0 unresolved (0 old, 0 new), peak 179402

(cute how the leaf/route number is above the peak)

box#show mls cef maximum-routes
FIB TCAM maximum routes :
=======================
Current :-
-------
 IPv4 + MPLS         - 192k (default)
 IPv6 + IP Multicast - 32k (default)

I know you can re-carve this ('mls cef maximum-routes ...'), which
obviously requires a reboot.  

My question is, what happens:  does the box just populate what it can,
causing randomly blackholed prefixes and other nasties, or does it punt
everything to MSFC, or some combination of the above?

cheers,
andrew


More information about the cisco-nsp mailing list