System Architecture Overview
JUNOS Internet software can efficiently support large numbers of interfaces
and virtual circuits.
Management interface—Different levels of system management tools are
provided, including the JUNOS command-line interface (CLI), the JUNOScript
application programming interface, the craft interface, and SNMP.
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.
Monitoring efficiency and flexibility—The router supports functions such
as alarm handling and packet counting on every port, without degrading
packet-forwarding performance.
The Routing Engine constructs and maintains one or more routing tables (see
Figure 25). 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 25: Control Packet Handling for Routing and Forwarding Table Updates
Packets
in
Packets
out
Packet Forwarding
Engines
Forwarding table
Forwarding table
updates
Routing protocol
packets from network
Routing Engine
Routing protocol
process
1240
Routing Engine Architecture
55
Summary of Contents for Internet Router M160
Page 12: ...M160 Internet Router Hardware Guide xii Table of Contents ...
Page 16: ...M160 Internet Router Hardware Guide xvi List of Figures ...
Page 18: ...M160 Internet Router Hardware Guide xviii List of Tables ...
Page 24: ...M160 Internet Router Hardware Guide xxiv Requesting Support ...
Page 26: ...2 Product Overview ...
Page 30: ...M160 Internet Router Hardware Guide 6 Safety Requirements Warnings and Guidelines ...
Page 66: ...M160 Internet Router Hardware Guide 42 Cable Management System ...
Page 80: ...M160 Internet Router Hardware Guide 56 Routing Engine Architecture ...
Page 82: ...58 Initial Installation ...
Page 104: ...M160 Internet Router Hardware Guide 80 Unpacking the Router ...
Page 148: ...M160 Internet Router Hardware Guide 124 Configuring the JUNOS Internet Software ...
Page 150: ...126 Hardware Maintenance Replacement and Troubleshooting Procedures ...
Page 242: ...M160 Internet Router Hardware Guide 218 Troubleshooting the Power System ...
Page 244: ...220 Appendixes ...
Page 292: ...M160 Internet Router Hardware Guide 268 Packing Components for Shipment ...
Page 301: ...Part 5 Index Index 277 ...
Page 302: ...278 Index ...