Cisco Systems A9014CFD manual 22-4

Chapter 22 Configuring Clocking

Configuring Network Clock for Cisco ASR 901 Router

	Command or Action		Purpose
Step 5	network-clock synchronization ssm		Configures the router to work in a synchronized network
	option {1 2 {GEN1 GEN2}}		mode as described in G.781. The following are the options:
	Example:			• Option 1: refers to synchronization networks designed
				for Europe (E1 framings are compatible with this
	Router(config)# network-clock			option).
	synchronization ssm option 2 GEN1			• 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	Configures general hold-off timer in milliseconds. The
	50-10000}global		default value is 300 milliseconds.
	Example:		Note Displays a warning message for values below 300
					ms and above 1800 ms.
	Router(config)# network-clock
	hold-off 75 global
Step 7	network-clock external		Overrides hold-off timer value for external interface.
	slot/card/port hold-off	{0	Note Displays a warning message for values above 1800
	50-10000}
					ms, as waiting longer causes the clock to go into the
	Example:				holdover mode.
	Router(config)# network-clock
	external 3/1/1 hold-off	300
Step 8	network-clock wait-to-restore		Sets the value for the wait-to-restore timer globally.
	0-86400 global		The wait to restore time is configurable in the range of 0 to
	Example:		86400 seconds. The default value is 300 seconds.
	Router(config)# network-clock
	external wait-to-restore 1000 global		Caution			Ensure that you set the wait-to-restore values
						above 50 seconds to avoid a timing flap.

	Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
22-4	OL-23826-09