Replacing A T640 Scg; Removing A T640 Scg - Juniper T640 Hardware Manual

T640 Core Router Hardware Guide
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Replacing a T640 SCG

Removing a T640 SCG

278
Wait until a message appears on the console confirming that the snapshot partition
3.
procedure is complete.
Issue the
request system reboot
4.
Issue the show system boot-messages
5.
card is listed as the primary boot device. The output lists the devices mounted. The
CompactFlash card is located at
T640 Routing Engine Description on page 33
T640 RE-C1800 Description on page 40
T640 RE-C1800 LEDs on page 41
T640 Preventing Electrostatic Discharge Damage on page 386
Backup SCGs are hot-removable and hot-insertable. Master and nonredundant SCGs
are hot-pluggable.
To replace an SCG, perform the following procedures:
Removing a T640 SCG on page 278
1.
2. Installing a T640 SCG on page 279
The router can have one or two SCGs installed. The SCGs are located in the upper rear
of the chassis, above the control boards and Routing Engines. Each SCG weighs
approximately 1.9 lb (0.9 kg).
If two SCGs are installed and both are functioning normally,
is the backup. Removing the backup SCG does not affect the functioning of the router.
Taking the master SCG offline might result in a brief loss of SONET clock lock while the
backup SCG becomes the master.
To remove an SCG (see Figure 160 on page
1.
Determine if the SCG is functioning as the master:
Check the blue MASTER
SCG is functioning as the master.
Use the following CLI command to display which SCG is functioning as the master:
user@host> show chassis clocks
Place an electrostatic bag or antistatic mat on a flat, stable surface.
2.
Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect
3.
the strap to one of the ESD points on the chassis.
command to reboot the router's software.
command to verify that the CompactFlash
.
ad0
279):
LED on the SCG faceplate. If this LED is on steadily, the
Copyright © 2013, Juniper Networks, Inc.
SCG0 is the master and SCG1