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PowerSupplies........................................................................................ 16
AC Power Supply................................................................................. 17
DC Power Supply ................................................................................ 18
PowerSupply LEDs and Self-test Button........................................................ 19
FanTray ............................................................................................... 19
Cable Management System .......................................................................... 20
Chapter 3
JUNOS Internet Software Overview.................................................................... 21
Routing Engine Software Components ..............................................................21
Routing Protocol Process ........................................................................ 22
IPv4 Routing Protocols ..................................................................... 22
IPv6 Routing Protocols ..................................................................... 24
Routing andForwarding Tables ............................................................ 24
Routing Policy............................................................................... 25
VPNs.............................................................................................. 26
Interface Process................................................................................. 26
Chassis Process .................................................................................. 26
SNMP and MIB IIProcesses..................................................................... 26
Management P rocess............................................................................ 27
Routing Engine Kernel........................................................................... 27
Tools for Accessing and Configuring the Software................................................... 27
Tools for Monitoring the Software.................................................................... 27
Software Upgrades.................................................................................... 28
Chapter 4
System Architecture Overview ........................................................................... 29
Packet Forwarding E
ngine Architecture.............................................................. 29
Data Flow through the Packet Forwarding Engine ............................................. 30
RoutingEngineArch
itecture.......................................................................... 31
Routing Engine Functions ....................................................................... 32
Part 2
Initial Installation
Chapter 5
Prepare for Router Installation........................................................................... 37
Rack Requirements
................................................................................... 37
Rack Size and Strength.......................................................................... 37
Spacing o f Mounting
Holes...................................................................... 39
Connection toBuildingStructure ............................................................... 39
Clearance Requirem
ents for Airflow and Hardware Maintenance.................................. 40
Router Environmental Tolerances.................................................................... 40
Fire Safety Requirem
ents............................................................................. 41
Fire Suppression................................................................................. 41
Fire Suppression Equ
ipment ....................................................................41
iv M5 and M10 Internet Routers Hardware Guide