The JUNOS routing protocol process is responsible for synchronizing the routing information between the routing and forwarding tables. To do this, the routing protocol process calculates the active routes from all the routes in the routing table and installs them into the forwarding table. The routing protocol process then copies the forwarding table to the router’s Packet Forwarding Engine, the part of the router that forwards packets. Figure 1 illustrates how the routing tables are synchronized.
Figure 1: Synchronizing Routing Exchange Between the Routing and Forwarding Tables
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