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ATM Switch Router Software Configuration Guide
OL-7396-01
Chapter 3 Initially Configuring the ATM Switch Router
Configuring Network Clocking
Enabling NCDP
To enable NCDP, use the following global configuration command for each node that you want to
configure for NCDP:
Configuring Network Clock Sources and Priorities
You must specify the clocking sources, their priorities, and associated stratums used by NCDP in
constructing the clock distribution tree. To do so, use the following command in global configuration
mode:
If you do not configure a clock source, NCDP advertises its default source of network clock, which is
its local oscillator; if no nodes in the network have a clock source configured, the tree is built so that it
is rooted at the switch having the highest stratum oscillator (lowest numerical value) and lowest ATM
address.
Example
The following example demonstrates configuring the network clock source, priority, and stratum on
node A in Figure 3-1.
Switch(config)# ncdp source 1 atm 1/0/0 3
Switch(config)# ncdp source 1 atm 3/0/0 3
Configuring Optional NCDP Global Parameters
Optional NCDP parameters you can configure at the global level include the maximum number of hops
between any two nodes, revertive behavior, and the values of the NCDP timers. To change any of these
parameters from their defaults, use the following commands in global configuration mode:
Command Purpose
ncdp Enables NCDP.
Command Purpose
ncdp source priority {{atm | cbr}
card/subcard/port stratum | bits
1
{0 | 1}
stratum | system}
1. Allows you to specify a Building Integrated Timing Supply (BITS) source. This option is available only on the
Catalyst 8540 MSR equipped with the network clock module.
Specifies a priority and source (stratum level
or system) for this interface.
Command Purpose
ncdp max-diameter hops Specifies the maximum network diameter for the
protocol. The default maximum network diameter
is 20.
ncdp revertive Specifies the NCDP as revertive.
ncdp timers {hello | hold} time-in-msec
jitter-percent
Specifies the values to be used by the NCDP
timers.