Juniper E120 - RELEASE 11.1.X HARDWARE GUIDE 3-25-2010 Hardware Manual page 98

E120 and E320 11.1.x Hardware Guide
NOTE: The primary SRP module illuminates the REDUNDANT LED when the SRP
module is part of a redundancy group and it is up and running (or ready to take over).
The standby SRP module monitors an activity signal from the primary SRP module
to determine its state; it does not shadow the operations of the primary SRP module.
If the standby SRP module detects that the primary SRP module is not active (and
high-availability mode is not enabled), it reboots the system and takes control. If
high-availability mode has been enabled, automatic switchover occurs with near
hitless failover.
Table 10: LED Identification and Activity Descriptions
LED Location LED Label
All modules
OK
FAIL
ONLINE
Line module
REDUN
SFM module
REDUN
SRP module
REDUN
PA
82
Understanding Status LEDs to Troubleshoot
LED Indicator LED Color
Module status Green
Module status Red
Module status Green
Redundancy Green
Redundancy Green
Redundancy Green
Power A Green
OFF to ON ON to OFF
Self-test passed Failure detected
Failure detected Diagnostic test
running
Module online Module offline
Module is active, Module is active,
and a standby and no standby
module is module is
available available
N+1 redundancy One of the five
is enabled; 2 SRPs fabric slices is
and 3 SFMs must down or not
be installed and installed.
working.
N+1 redundancy
When LED is lit, is not enabled.
you can remove
the module
without
interrupting
service.
Module is the Module is no
spare system longer acting as
controller, is up, the spare system
and is ready to controller.
take the role of the
online system
controller.
Power is online on Power is off.
source A.