Juniper M40E Hardware Manual page 91

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The Routing Engine constructs and maintains one or more routing tables (see Figure 37
on page 63). From the routing tables, the Routing Engine derives a table of active routes,
called the forwarding table, which is then copied into the Packet Forwarding Engine. The
design of the ASICs allow the forwarding table in the Packet Forwarding Engine to be
updated without interrupting forwarding performance.
Figure 37: Control Packet Handling for Routing and Forwarding Table
Updates
Installing a Routing Engine in an M40e Router on page 189
M40e Routing Engine Description on page 26
Chapter 4: M40e System Architecture Overview
63