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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 2 Configuring General Switch Features
Configuring Clock Sources
Step 2
Enter the dspncdp command to verify that the NCDP parameters were set properly.
M8850_LA.8.PXM.a >
dspncdp
Distribution Mode : ncdp
Node stratum level : 3
Max network diameter : 20
Hello time interval : 500 ms
Hold Down time interval : 500 ms
Topology change time interval : 500 ms
Root Clock Source : internal clock
Root Clock Source Reason : Free Run
Root Clock Source Status : ok
Root Stratum Level : unknown
Root Priority : 0
Secondary Clock Source : 0.0
Secondary Clock Source Reason : unknown
Secondary Clock Source Status : unknown
Last Clock Source change time : N/A
Last Clock Source change reason : None
Once NCDP is enabled on your node, the best clock source and second best clock source are
automatically selected and distributed to all nodes in the network that have NCDP enabled. If no
previous NCDP clock configuration has been done, NCDP selects a root clock source that comes from
an internal oscillator. If you want the root clock source to come from an external source, use the
cnfncdpclksrc command as described in the
“Configuring an NCDP Clock Source”
section in
Chapter 9, “Switch Operating Procedures.”
Note
Cisco recommends using an external clock source instead of the internal oscillator.
Caution
If you want to specify the root clock source to come from an external source before you enable NCDP,
use the cnfncdpclksrc <portid> 0 command as described in the
“Configuring an NCDP Clock Source”
section in
Chapter 9, “Switch Operating Procedures.”
If you run cnfncdpclksrc <portid> 0 before you
enable NCDP with the cnfncdp command, the root clock source will be the external clock you
configured, instead of the internal oscillator.
If you wish to change the BITS clock selected by NCDP, enter the cnfncdpclksrc command, as described
in the
“Configuring an NCDP Clock Source”
section in
Chapter 9, “Switch Operating Procedures.”
-holdtime
Specifies the time interval, in milliseconds, between each PDU
configuration. The range is 47 through 60000 milliseconds.
Default = 500 milliseconds
-topoChangeTimer
Time interval, in milliseconds, for which the topology change
notification bit will be sent in the the configuration PDUs. The range
is from 47 through 60000 milliseconds.
Default = 500 milliseconds
Table 2-7
cnfncdp Command Parameters (continued)
Parameter
Description
