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Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
OL-23826-09
Chapter 22 Configuring Clocking
Configuring Network Clock for Cisco ASR 901 Router
Step 5
network-clock synchronization ssm
option {1 | 2 {GEN1 | GEN2}}
Example:
Router(config)# network-clock
synchronization ssm option 2 GEN1
Configures the router to work in a synchronized network
mode as described in G.781. The following are the options:
• Option 1: refers to synchronization networks designed
for Europe (E1 framings are compatible with this
option).
• Option 2: refers to synchronization networks designed
for the US (T1 framings are compatible with this
option).
The default option is 1 and while choosing option 2,
you need to specify the second generation message
(GEN2) or first generation message (GEN1).
Note Network-clock configurations that are not common
between options need to be configured again.
Step 6
network-clock hold-off {
0
|
50-10000
} global
Example:
Router(config)# network-clock
hold-off 75 global
Configures general hold-off timer in milliseconds. The
default value is 300 milliseconds.
Note Displays a warning message for values below 300
ms and above 1800 ms.
Step 7
network-clock external
slot/card/port
hold-off {
0
|
50-10000
}
Example:
Router(config)# network-clock
external 3/1/1 hold-off 300
Overrides hold-off timer value for external interface.
Note Displays a warning message for values above 1800
ms, as waiting longer causes the clock to go into the
holdover mode.
Step 8
network-clock wait-to-restore
0-86400
global
Example:
Router(config)# network-clock
external wait-to-restore 1000 global
Sets the value for the wait-to-restore timer globally.
The wait to restore time is configurable in the range of 0 to
86400 seconds. The default value is 300 seconds.
Caution Ensure that you set the wait-to-restore values
above 50 seconds to avoid a timing flap.
Command or Action Purpose