Specifications

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Cisco MGX 8850 (PXM45) and MGX 8950 Software Configuration Guide
Release 3, Part Number 78-14788-01 Rev. C0, January 2004
Chapter 7 Switch Operating Procedures
Managing Network Clock Sources
If one or both lines appear to be bad, determine whether the working or protection line is in alarm.
Troubleshoot and correct the standby line first. Replace the components along the signal path until the
problem is resolved.
• If the dspapslns command at either end of the line indicates a front or back card problem, resolve
that problem first. (See Table 7-9 to card problems).
• If the dspapslns command shows a signal failure on the standby line, replace that line.
• If the standby line is still down, replace the cards along the signal path.
Managing Network Clock Sources
The following sections describe how to do the following tasks:
• View the configured clock sources
• Reconfigure network clock sources
• Delete clock sources
• Restore clock the clock source after failure
Synchronizing Time of Day Clocks
Clock synchronization is valuable for network clients with applications which need to have a reliable
and accurate TOD. MGX switches use SNTP to synchronize Time of Day (TOD) clocks between a client
and a server. An SNTP client can be configured to synchronize with one primary SNTP server and up to
three secondary SNTP servers, and an SNTP server can support up to 200 clients.
Protection SF SF Red Red Active card is not receiving signal from either line. The
protection line was the last line to work.
Working UNAVAIL UNAVAIL — — The card set is not complete. One or more cards have failed
or been removed. See Table 7-9 to troubleshoot card errors.
Table 7-8 Troubleshooting APS Line Problems Using the dspaps Command (continued)
Active
Line
Working
Line
Protection
Line
Working
Line LED
Protection
Line LED Description
Table 7-9 Troubleshooting Card Problems
APS Line Failure Possible Cause
All lines in upper and lower bays. Suspect a bad or removed front card. If both front
cards are good, both back cards may be bad.
All lines in upper bay only. Lower bay APS lines
ok.
Suspect bad upper bay back card.
All lines in lower bay only. Upper bay APS lines
ok.
Suspect bad lower bay back card.