Cisco Systems OL-7396-01 Manual De Usuario
3-11
ATM Switch Router Software Configuration Guide
OL-7396-01
Chapter 3
Initially Configuring the ATM Switch Router
Configuring Network Clocking
Systems equipped with the network clock module can derive clocking from a Building Integrated Timing
Supply (BITS) source. To specify the line type attached to the BITS ports on the network clock module
and to assign a priority to a port, use the following commands in global configuration mode:
Supply (BITS) source. To specify the line type attached to the BITS ports on the network clock module
and to assign a priority to a port, use the following commands in global configuration mode:
Examples
The following example shows how to configure the network clock priorities:
Switch(config)# network-clock-select 1 atm 0/0/0
Switch(config)# network-clock-select 2 atm 0/0/3
Note
This configuration assumes that a full-width module, such as the 4-port OC-12c module, is being used
to derive clocking. If port adapters inserted into carrier modules are used, the priority 1 and 2 source
ports must be on different port adapters.
to derive clocking. If port adapters inserted into carrier modules are used, the priority 1 and 2 source
ports must be on different port adapters.
The following example shows how to configure the network clock to revert to the highest priority clock
source after a failure and takeover by the source with the next lowest priority.
source after a failure and takeover by the source with the next lowest priority.
Switch(config)# network-clock-select revertive
Configuring Network Clock Sources and Priorities (Catalyst 8510 MSR and
LightStream 1010)
LightStream 1010)
To configure the network clocking priorities and sources, use the following command in global
configuration mode:
configuration mode:
Note
Specifying the keyword system with the network-clock-select command selects the route processor
reference clock (a stratum 4 clock source).
reference clock (a stratum 4 clock source).
Examples
The following example shows how to configure the network clock priorities:
Switch(config)# network-clock-select 1 atm 0/0/0
Switch(config)# network-clock-select 2 atm 0/0/3
The following example shows how to configure the network clock to revert to the highest priority clock
source after a failure and takeover by the source with the next lowest priority.
source after a failure and takeover by the source with the next lowest priority.
Switch(config)# network-clock-select revertive
Command
Purpose
network-clock-select bits {t1 | e1}
Selects the line type. This command applies to
both BITS ports.
both BITS ports.
network-clock-select priority bits {0 | 1}
Selects the priority for a BITS port.
Command
Purpose
network-clock-select {priority {{atm | cbr}
card/subcard/port} | system} | revertive
card/subcard/port} | system} | revertive
Configures the network clock priority.