JUNOS Internet Software Network Operations Guide: Hardware
556 ! Performing a Swap Test on a Redundant SCG
Step 1: Display the SCG Master and Standby from the Craft Interface Output
Action To determine the SCG master and SCG standby from the craft interface status
information, use the following CLI command:
user@host> show chassis craft-interface
Sample Output
user@host>
show chassis craft-interface
[...Output truncated...]
SCG LEDs:
SCG 0 1
--------------
Amber . .
Green * *
Blue * .
[...Output truncated...]
What It Means The command output displays which SCG is operating as master. Asterisks (*)
indicate the operation status. The color represents the possible SCG operating
states:
Amber (Fail), Green (OK), and Blue (Master). The SCG in slot 0 is operating as
master; the SCG in slot 1 is the backup.
Step 2: View the SCG LEDs
Action Check the blue MASTER LED on the SCG faceplate. If this LED is on steadily, the SCG
is functioning as master. Table 118 on page 555 describes the functions of the SCG
LEDs.
Performing a Swap Test on a Redundant SCG
Action To perform a swap test on a redundant SCG, follow these steps:
1. Take the SCG offline by doing one of the following:
! Use the following CLI command:
user@host> request chassis scg offline slot number
! Attach an electrostatic discharge (ESD) wrist strap to your bare wrist, and
connect the wrist strap to one of the ESD points on the chassis. Press the
online/offline button on the SCG faceplate and hold it down until the LED
goes out (about 5 seconds).
2. Loosen the captive screws on the edges of the SCG faceplate.
3. Grasp the SCG by the handle on the faceplate and slide it out of the chassis.
4. Place the SCG on the antistatic mat.
CAUTION: Before performing a swap test, always check for bent pins in the
midplane and check the SCG for stuck pins in the connector. Pins stuck in the
component connector can damage other good slots during a swap test.
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