Juniper JUNOS - NETWORK OPERATION GUIDE REV1 User Manual

Displaying Redundant SCG Mastership ! 555
Chapter 41: Monitoring Redundant SCGs
Step 2: Display the Redundant SCG LED States at the Command Line
Action To display the redundant SCG LED states, use the following CLI command:
user@host> show chassis craft-interface
Sample Output t320@host> show chassis craft-interface
[...Output truncated...]
SCG LEDs:
SCG 0 1
--------------
Amber . .
Green * *
Blue * .
[...Output truncated...]
What It Means The command output displays the SCG LED status. The router has two SCGs
installed. Asterisks (*) indicate the operation status. The color represents the
possible SCG operating states:
Amber (Fail), Green (OK), and Blue (Master). Both
SCGs are functioning properly (Green). The SCG in slot 0 is operating as master; the
SCG in slot 1 is the backup.
Step 3: View the Redundant SCG LEDs
Action To view the redundant SCG LEDs, remove the rear component cover and look on
the SCG faceplate at the rear of the router chassis. Table 118 describes the functions
of these LEDs.
Table 118: SCG LEDs
Displaying Redundant SCG Mastership
If both SCGs are installed and functioning normally, SCG0 is master and SCG1 is
backup. Removing the backup SCG does not affect the functioning of the routing
node. Taking the master SCG offline might result in a brief loss of SONET clock lock
while the backup SCG becomes master.
Steps To Take To determine which SCG is operating as the master and which is operating as the
standby, follow these steps:
1. Display the SCG Master and Standby from the Craft Interface Output on
page 556
2. View the SCG LEDs on page 556
Label Color State Description
OK Green On steadily SCG is online and is functioning
normally.
FAIL Amber On steadily SCG has failed.
MASTER Blue On steadily SCG is functioning as master.

Juniper JUNOS - NETWORK OPERATION GUIDE REV1 Specifications

General

Brand	Juniper
Model	JUNOS - NETWORK OPERATION GUIDE REV1
Category	Software
Language	English