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Cisco MGX 8850 (PXM1E/PXM45), Cisco MGX 8950, Cisco MGX 8830, and Cisco MGX 8880 Configuration Guide
Release 5.0.10, OL-3845-01 Rev. B0, August 16, 2004
Chapter 9 Switch Operating Procedures
Managing Manually Configured Clocks Sources
Reconfigure Manual Clock Sources
The procedure you use to reconfigure a clock source depends on whether or not you need to change the
role of the clock source. If the clock source keeps its role as either primary or secondary, just enter a new
cnfclksrc command as described in the following locations:
•
To reconfigure a clock source for a BITS clock, see the “
Configuring the MPLS Controller
” section
in
Chapter 2, “Configuring General Switch Features.”
•
To reconfigure a clock source to use a PXM1E line, see the “
” section in
Chapter 3, “Provisioning PXM1E Communication Links.”
•
To reconfigure a clock source to use a AXSM line, see refer to the Cisco ATM Services (AXSM)
Configuration Guide and Command Reference for MGX Switches, Release 5.
When reconfiguring a clock source from primary to secondary or from secondary to primary, you must
delete both existing clock sources and define new clock sources. The switch will not allow you to create
two primary or two secondary clock sources, and the switch will not allow you to configure the same
line as both primary and secondary clock sources. After you have deleted the old clock source, you can
use the appropriate procedure (referenced above) to define a new clock source.
To delete a clock source, enter the delclksrc command as described in the next section.
Delete Manual Clock Sources
Deleting a clock source deletes the definition of the clock source, not the clock source itself. You might
want to delete a primary or secondary clock source definition so that you can reassign the clock source
to another line.
To delete a clock source, use the following procedure.
Step 1
Establish a configuration session using a user name with SUPER_GP privileges or higher.
Step 2
Display the clock source information by entering the dspclksrcs command.
You will need the information in this display to delete the clock source.
Step 3
To delete a clock source, enter the delclksrc command.
mgx8830a.1.PXM.a >
delclksrc
<
priority
>
The following example deletes a primary clock source:
mgx8830a.1.PXM.a >
delclksrc
primary
Step 4
To verify that a clock source has been deleted, enter the dspclksrcs command. When the primary or
secondary clock source is deleted, the clock type is set to null.
Restore a Manual Clock Source After Failure
The revertive option for clock sources connected to the PXM allows a primary clock source to resume
operation as the primary clock source after a failure and restoration of the clock signal. However, if you
have the revertive option disabled, you will have to manually reconfigure a failed primary clock source
after it recovers before it can resume operation as the primary clock source.
