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Table 10: Routing Engine LEDs
DescriptionStateColorLabel
Routing Engine is the Master.On steadilyBlue
MASTER
Hard disk is functioning normally.Green
blinking
Green
HDD
Routing Engine is transitioning online.
Routing Engine is functioning normally.
Blinking
On steadily
Green
ONLINE
Routing Engine has failed.On steadilyRed
FAIL
Routing Engine Interface Ports
Three Routing Engine ports connect the Routing Engine to one or more external
devices on which system administrators can issue JUNOS command-line interface
(CLI) commands to manage the router (see Figure 9 on page 14).
The ports with the indicated labels function as follows:
■
AUX—Connects the Routing Engine to a laptop, modem, or other auxiliary device
through a serial cable with an RJ-45 connector.
■
CONSOLE—Connects the Routing Engine to a system console through a serial
cable with an RJ-45 connector.
■
ETHERNET—Connects the Routing Engine through an Ethernet connection to a
management LAN (or any other device that plugs into an Ethernet connection)
for out-of-band management. The port uses an autosensing RJ-45 connector to
support 10-Mbps or 100-Mbps connections. Two small LEDs on the top of the
port indicate the connection in use: the LED flashes yellow or green for a 10-Mbps
or 100-Mbps connection, and the LED is light green when traffic is passing
through the port.
For information about the pinouts for the connectors, see “Cable Connector
Pinouts” on page 185.
Routing Engine Boot Sequence
The Routing Engine boots from the storage media in this order: the USB device (if
present), then the CompactFlash card, then the hard disk, then the LAN.
If the Routing Engines are configured for nonstop routing and graceful switchover,
the backup Routing Engine automatically synchronizes its configuration and state
with the master Routing Engine. Any update to the master Routing Engine state is
replicated on the backup Routing Engine. If the backup Routing Engine assumes
mastership, packet forwarding continues through the router without interruption.
For more information about graceful switchover, see the JUNOS High Availability
Configuration Guide.
16 ■ Host Subsystem
MX240 Ethernet Services Router Hardware Guide