Juniper CBL-M40-PWR-AU ユーザーズマニュアル
System Architecture Overview
Routing Engine Architecture
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Storage and change management—Configuration files, system images, and microcode
can be held and maintained in primary and secondary storage systems, permitting local
or remote upgrades.
or remote upgrades.
Monitoring efficiency and flexibility—The router supports functions such as alarm
handling and packet counting on every port, without degrading packet-forwarding
performance.
performance.
The Routing Engine constructs and maintains one or more routing tables. 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 Internet Processor II
ASIC allows the forwarding table in the Packet Forwarding Engine to be updated without
interrupting forwarding performance. See Figure 14.
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 Internet Processor II
ASIC allows the forwarding table in the Packet Forwarding Engine to be updated without
interrupting forwarding performance. See Figure 14.
Figure 14: Control Packet Handling: Routing and Forwarding Table Updates
Packets
in
Packets
out
Packet Forwarding
Engine
Forwarding table
Forwarding table
updates
updates
Routing protocol
packets from network
packets from network
Routing Engine
Routing protocol
process
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