Increased forwarding capabilities for MPCs and Multiservices DPCs through FIB localization

Forwarding information base (FIB) localization characterizes the Packet Forwarding Engines in a router into two types: FIB-Remote and FIB-Local. FIB-Local Packet Forwarding Engines install all of the routes from the default route tables into Packet Forwarding Engine forwarding hardware. FIB-Remote Packet Forwarding Engines create a default (0.0) route that references a next hop or a unilist of next hops to indicate the FIB-Local that can perform full IP table looks-ups for received packets. FIB-Remote Packet Forwarding Engines forward received packets to the set of FIB-Local Packet Forwarding Engines. The capacity of MPCs is much higher than that of Multiservices DPCs, so an MPC is designated as the local Packet Forwarding Engine, and a Multiservices DPC is designated as the remote Packet Forwarding Engine. The remote Packet Forwarding Engine forwards all network-bound traffic to the local Packet Forwarding Engine. If multiple MPCs are designated as local Packet Forwarding Engines, then the Multiservices DPC will load-balance the traffic using the unilist of next hops as the default route.