Table 147: Checklist For Monitoring The Redundant Scg; Redundant Scgs Overview - Juniper M Series Monitoring And Troubleshooting Manual

M Series and T Series Routers Monitoring and Troubleshooting Guide
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Documentation

Redundant SCGs Overview

658
Table 147: Checklist for Monitoring the Redundant SCG (continued)
Monitor SCG Tasks
1. Display the SCG Master and Standby from
the Craft Interface Output on page 662
2. View the SCG LEDs on page 663
"Perform a Swap Test on a Redundant
SCG" on page 663
"Return the SCG" on page 664
Redundant SCGs Overview on page 658
Inspect redundant SCGs to ensure that they provide a clock signal for the SONET/SDH
interfaces on the router and that they select a clock signal from any FPC, or from the
external clock inputs.
Two SCGs are installed in the T320 router and the T640 router. The SCGs install into the
upper rear of the chassis in the slots labeled
If both SCGs are installed and functioning normally,
Removing the backup SCG does not affect the functioning of the router. Taking the master
SCG offline can result in a brief loss of SONET clock lock while the backup SCG becomes
master.
The SCGs are hot-pluggable.
Figure 333 on page 659 shows the location of the SCGs on the T320 router, T640 router,
and T1600 router.
Command or Action
show chassis craft-interface
Remove the rear component cover and look on
the SCG faceplate at the rear of the T320
router, T640 router, or T1600 router chassis.
1. Take the SCG offline.
request chassis scg offline slot number
2. Replace the SCG with one that you know
works.
3. Bring the SCG online.
request chassis scg offline slot number
4. Verify the SCG status.
request chassis scg offline slot number
See "Return the Failed Component" on page
or follow the procedure in the respective router
hardware guide.
SCG0 and SCG1 .
is master and
SCG0
Copyright © 2012, Juniper Networks, Inc.
116,
is backup.
SCG1