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 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 : 30
Hello time interval : 300
Holddown time interval : 300
Topology change time interval : 300
Root Clock Source : 255.255
Root Stratum Level : 3
Root Priority : 128
Last clk src change time : Feb 21 2002 14:16:11
Last clk src change reason : Topology Changed
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 with NCDP enabled. If no previous
NCDP clock configuration has been done, NCDP selects a root clock source will come from an internal
oscillator. If you want to specify 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 7, “Switch Operating Procedures.”
Note Cisco recommends using an external clock source instead of the internal oscillator.
Note 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 7, “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.
BITS clock configuration is automatically done when you enable NCDP on your node. If you wish to
change the BITS clock selected by NCDP, use the cnfncdpclksrc command, as described in the
“Configuring an NCDP Clock Source” section in Chapter 7, “Switch Operating Procedures.”
-holdtime Specifies the time interval, in milliseconds, between each PDU
configuration. The range is from 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 2-8 cnfncdp Command Parameters (continued)
Parameter Description