9-28
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 the Time of Day Across the Network Using SNTP
Step 3
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
to troubleshoot 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 the Time of Day Across the Network Using SNTP
Cisco MGX and SES products support the Simple Network Time Protocol (SNTP), which you can use
to synchronize the time on all nodes in a network. The following sections describe how to do the
following tasks:
•
Enable and configure SNTP servers
•
Display the current SNTP configuration
•
Display an SNTP server
•
Delete an existing SNTP server
Enabling and Configuring SNTP Servers
Clock synchronization is valuable for network clients with applications which need to have a reliable
and accurate Time of Day (TOD). SES switches use SNTP to synchronize 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.
In an SNTP server/client configuration, the SNTP client periodically requests TOD from the server. If
the primary server is not available for some reason, the SNTP client switches over to the next available
secondary server for TOD information until the primary server comes back up.
An SNTP server can reside on an active PXM in an MGX and in and SES switch. An SES switch an be
an SNTP server, but not an SNTP client.
Table 9-9
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.
