Enabling Ncdp On A Switch; Configuring An Ncdp Clock Source; Table 9-13 Cnfncdp Command Parameters - Cisco MGX 8850 (PXM1E/PXM45) Configuration Manual

Managing NCDP Clock Sources

Enabling NCDP on a Switch

By default, NCDP is disabled on all nodes and all NNI ports. To enable NCDP on a switch, enter the
cnfncdp command as follows:
M8850_LA.8.PXM.a > cnfncdp [-distributionMode 1|2] [-maxNetworkDiameter diameter]
[-hello time] [ -holdtime time] [ -topoChangeTimer time]
NCDP must be enabled at each switch that will participate in NCDP clock distribution.
Note
The -distributionMode option is the only option required to enable NCDP.
options available for the cnfncdp command.

Table 9-13 cnfncdp Command Parameters

Parameter
-distributionMode
-maxNetworkDiameter This option specifies the maximum network diameter in hops. This is the
-hello
-holdtime
-topoChangeTimer

Configuring an NCDP Clock Source

After you enable NCDP through the cnfncdp command, NCDP automatically selects the root clock
source based on the following criteria:
•
•
•
•
You can manipulate these criteria and specify a clock source through the cnfncdpclksrc command as
follows.
M8850_LA.8.PXM.a > cnfncdpclksrc <portid> <prstid> [-clocktype {e1 | t1}] [-priority
<priority>] [-stratumLevel <level>]
Table 9-14
Cisco MGX 8850 (PXM1E/PXM45), Cisco MGX 8950, Cisco MGX 8830, and Cisco MGX 8880 Configuration Guide
9-32
Description
This option selects either NCDP or manual mode clock distribution. To
select NCDP mode, enter 1. To select manual clock distribution, enter 2. The
default is 1 for NCDP.
maximum length of the spanning tree. The range is 3 to 200, and the default
is 20.
This option specifies the NCDP hello packet interval. NCDP hello packets
advertise the best network clock source. The range is 75 to 60000
milliseconds, and the default is 500 milliseconds.
This option specifies the hold time interval. The range is 75 to 60000
milliseconds, and the default is 500 milliseconds.
This option specifies the topology change timer interval. The range is 75 to
60000 milliseconds, and the default is 500 milliseconds.
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
describes the options available for the cnfncdpclksrc command.
Chapter 9 Switch Operating Procedures
Table 9-13 describes the
Release 5.0.10, OL-3845-01 Rev. B0, August 16, 2004