Related
Documentation
•
M120 Routing Engine LEDs on page 25
•
M120 Routing Engine Interface Ports and Status Indicators on page 28
•
Maintaining the M120 Host Subsystem on page 266
•
Replacing an M120 Routing Engine on page 195
•
Routing Engine Interface Cable and Wire Specifications for the M120 Router on page 105
M120 Routing Engine LEDs
Each Routing Engine has one LED that indicates its status. The LED, labeled
ONLINE
, is
located directly on the faceplate of the Routing Engine.
describes
the functions of the Routing Engine LED.
Table 9: M120 Routing Engine LED
Description
State
Color
Label
Routing Engine is transitioning online.
Routing Engine is functioning normally.
Blinking
On steadily
Green
ONLINE
Routing Engine has failed.
On steadily
Red
Hard disk is being accessed.
Blinking
Green
HDD
Related
Documentation
M120 Routing Engine Description on page 22
•
•
M120 Routing Engine Interface Ports and Status Indicators on page 28
•
Maintaining the M120 Host Subsystem on page 266
•
Replacing an M120 Routing Engine on page 195
•
Routing Engine Interface Cable and Wire Specifications for the M120 Router on page 105
M120 RE-A-1800x2 Routing Engine Description
•
Routing Engine Components on page 25
•
Routing Engine Boot Sequence on page 27
Routing Engine Components
The Routing Engine (shown in
) consists of the following components:
•
CPU—Runs Junos OS to maintain the router's routing tables and routing protocols.
•
DRAM—Provides storage for the routing and forwarding tables and for other Routing
Engine processes.
25
Copyright © 2018, Juniper Networks, Inc.
Chapter 5: Host Subsystem Components and Descriptions
Summary of Contents for M120
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