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 NCDP Clock Sources
Configuring an NCDP Clock Source
When you enable NCDP through the cnfncdp command, NCDP automatically selects the root clock
source based on the following criteria:
• Priority (should be sufficient to find the root)
• Stratum level (should be sufficient as a tie-breaker)
• Clock source reference
• ATM address of the switch
You can manipulate these criteria and specify a clock source through the cnfncdpclksrc <options>
command, as shown in the following example:
M8850_LA.8.PXM.a > cnfncdpclksrc 7.35 0 -priority 100 -stratumLevel 2
Table 7-14 describes the options available for the cnfncdpclksrc command.
Note Once you enable NCDP, it is automatically enabled on all NNI ports on the switch.
Enter the dspncdpclksrc <portid> command to ensure the NCDP configuration took effect. Replace
<portid> with the 7.35 or 7.36 (for T1/E1 ports). The following example displays the NCDP
configuration on an E1 port.
M8850_LA.8.PXM.a > dspncdpclksrc 7.35
Best clock source : No
Priority : 100
Stratum level : 2
Primary reference src id : 0(external)
Health : Bad
Table 7-14 cnfncdpclksrc Command Parameters
Parameter Description
port-id Port identifier. For clocking ports, the port
identifier is 7.35 or 7.36. For internal oscillator,
the port identifier is 255.255.
prs -id Determines the primary reference source. Enter 0
for an external source, or 255 for an internal
source.
-priority Prioritizes the clock source. Enter a number in the
range from 1 to 255.
Default = 128
-stratumLevel Determines the stratum level of the clock source.
Possible levels are 1, 2E, 2, 3E, 3, 4E, or 4.
Default = 3