Configuring The Transmit Clocking Source; Displaying The Network Clocking Configuration - Cisco Catalyst 8540 MSR Configuration Manual

Configuring Network Clocking

Configuring the Transmit Clocking Source

To configure where each interface receives its transmit clocking, perform the following steps, beginning
in global configuration mode:
Command
Step 1
Switch(config)# interface atm card/subcard/port
Switch(config-if)#
Step 2 Switch(config-if)# clock source {free-running |
loop-timed | network-derived}
Caution If the Network Clock Distribution Protocol (NCDP) is running on an interface, you should not override
that port's clock source by configuring it to free-running or loop-timed. Doing so could cause
synchronization problems, particularly in the case of loop-timed, which could cause a clocking loop to
be formed on a link. See the
Example
The following example configures ATM interface 3/0/0 to receive its transmit clocking from a
network-derived source:
Switch(config)# interface atm 3/0/0
Switch(config-if)# clock source network-derived

Displaying the Network Clocking Configuration

To show the switch's network clocking configuration, use the following privileged EXEC commands:
Command
show network-clocks
more system:running-config
show controllers [atm card/subcard/port]
Examples
The following example shows the configured network clock sources on a Catalyst 8510 MSR or
LightStream 1010:
Switch# show network-clocks
clock configuration is NON-Revertive
Priority 1 clock source: ATM1/0/0
Priority 2 clock source: ATM1/1/0
Priority 3 clock source: No clock
Priority 4 clock source: No clock
Priority 5 clock source: System clock
Current clock source:System clock, priority:5
A source listed as "No clock" indicates that no clock source configured at that priority.
Note
ATM Switch Router Software Configuration Guide
3-12
Purpose
Selects the interface to be configured.
Configures the interface clock source.
Configuring Network Clocking with NCDP, page
Purpose
Shows the network clocking configuration.
Shows the interface clock source configuration.
Shows the interface controller status.
Chapter 3 Initially Configuring the ATM Switch Router
3-13.
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