> > > On Tue, 8 Aug 2006, Richard A Steenbergen wrote: > > ... > > Yes the new generation of gear uses a prepopulated CAM as a FIB by > > default (marketing name FDR, same as Cisco CEF), though there is an > > option to turn it off and do fast-cache type behavior, or use the > > traditional dr/net-agg cam aggregation. > ... > > Strictly speaking, Cisco CEF is just a way to store a > forwarding table for fast lookups. The storage could be in > some kind of content addressable memory, and looked up by an > ASIC, or it could be in RAM and looked up by the the router's CPU. > > Even Cisco 26xx routers support CEF now, even though this > is purely a software device driven device. You just have to > pay the cost of storing both the routing table, and the CEF > FIB in RAM. > > So Foundry made the jump to putting the full routing table > in CAM with the MLX? Juniper has always operated this way, > so why have some respondants talked about replacing Juniper's > with MLXs? Other than that some of the old processing > engines on the Juniper's lacked enough memory for some > features, there should be little difference at the L2/L3 > forwarding level these days? > >
Foundry does NOT store the full routing table in the FIB it only stores the most specific. The way I understand it, (as explained to me by a foundry SE). Is that any changes to the RIB get populated to the FIB only if a more specific route is found.
