User Manual

M40 Internet Router Hardware Guide
iv
Craft Interface ......................................................................................................17
FPC LEDs and Offline Button.........................................................................18
Alarm Relay Contacts, LEDs, and Cutoff Button.............................................18
LCD ...............................................................................................................19
Routing Engine LEDs and Interface Ports ......................................................19
Power Supplies .....................................................................................................20
AC Power Supply...........................................................................................21
DC Power Supply...........................................................................................22
Power Supply LEDs .......................................................................................22
Cooling System.....................................................................................................23
Cooling System Components.........................................................................23
Airflow through the Chassis...........................................................................24
Cable Management System ..................................................................................24
Chapter 3
JUNOS Internet Software Overview...........................................................25
Routing Engine Software Components .................................................................26
Routing Protocol Process...............................................................................26
Routing Protocols...................................................................................26
Routing and Forwarding Tables..............................................................28
Routing Policy ........................................................................................28
Interface Process...........................................................................................29
SNMP and MIB II Processes...........................................................................29
Management Process ....................................................................................29
Routing Engine Kernel...................................................................................29
Tools for Accessing and Configuring the Software ................................................30
Software Monitoring Tools....................................................................................30
Software Upgrades ...............................................................................................30
Chapter 4
System Architecture Overview .....................................................................31
Packet Forwarding Engine Architecture................................................................32
Data Flow through the Packet Forwarding Engine.........................................33
Routing Engine Architecture .................................................................................33
Routing Engine Functions..............................................................................34