Purpose
Command
Configures a clock source line interface, an external
timing input interface, GPS interface, or a
packet-based timing recovered clock as the input
clock for the system and defines its priority. Priority
is a number between 1 and 250.
This command also configures the type of signal for
an external timing input interface. These signals are:
•
T1 with Standard Frame format or Extended
Standard Frame format.
•
E1 with or without CRC4
•
2 MHz signal
•
Default for Europe or Option I is e1 crc4 if the
signal type is not specified.
•
Default for North America or Option II is t1 esf
if signal type is not specified.
The no version of the command reverses the
command configuration, implying that the
priority has changed to undefined and the
state machine is informed.
Note
Router(config)# [no] network-clock input-source
<priority> {interface <interface_name>
<slot/card/port> | top <slot/card/port/session> |
{external <slot/card/port> [t1 {sf | efs | d4} | e1
[crc4| fas| cas [crc4] | 2m | 10m]}}
Example:
Router(config)# network-clock input-source
23 top 2/0/1/3
Example for GPS interface:
Router(config)#
network-clock input-source 1
external 3/0/0 10m
Specifies whether or not the clock source is revertive.
Clock sources with the same priority are always
non-revertive. The default value is non-revertive.
In non-revertive switching, a switch to an alternate
reference is maintained even after the original
reference recovers from the failure that caused the
switch. In revertive switching, the clock switches
back to the original reference after that reference
recovers from the failure, independent of the condition
of the alternate reference.
Router(config)# [no] network-clock revertive
Example:
Router(config)#
network-clock revertive
Cisco ASR 1000 Series Aggregation Services Routers SIP and SPA Software Configuration Guide, Cisco IOS XE
Everest 16.5
OL-14127-17
137
Configuring the Ethernet SPAs
Configuring the Network Clock for the 2-Port Gigabit Synchronous Ethernet SPA on a Cisco ASR 1000 Series Router