Network Synchronization Support
Network Synchronization Overview
4
Cisco ASR 1000 Series Aggregation Services Routers Software Configuration Guide
made the default clock source. If the highest level of quality is offered by more than one clock source,
then among the clock sources that offer the highest level of quality, the clock source with the highest
priority is made the default clock source. You can also manage synchronization by using the following
management options:
•
Hold-Off Time: If a clock source goes down, the router waits for a specific hold-off time before
removing the clock source from the clock selection process. By default, the value of hold-off time
is 300 ms.
•
Wait to Restore: If a SyncE interface comes up, the router waits for a specific period of time before
considering the SyncE interface for synchronization source. By default, the value is 300 seconds.
•
Force Switch: Forcefully select a synchronization source irrespective of whether the source is
available or within the specified range.
•
Manual Switch: Manually selects a synchronization source, provided the clock source has a higher
quality level than the currently active clock.
Table 3
lists the SPAs that support network synchronization.
Table 3
SPAs that support Network Synchronization
SPA Type
SPA
Hybrid
SPA_TYPE_HYBRID_2KP
Prowler
SPA_TYPE_PRO_1xCHOC3_STM1
Chopper
SPA_TYPE_CHOP_1xCHOC12
CEOP
SPA_TYPE_CEOP_1xOC3
SPA_TYPE_CEOP_24xT1E1
ATM
SPA_TYPE_TATM_1xOC3
SPA_TYPE_TATM_2xOC3
SPA_TYPE_TATM_3xOC3
SPA_TYPE_TATM_1xOC12
POS
SPA_TYPE_POS_2xOC3
SPA_TYPE_POS_4xOC3
SPA_TYPE_POS_1xOC12
SPA_TYPE_POS_2xOC12
SPA_TYPE_POS_MF_4xOC3
SPA_TYPE_POS_MF_8xOC3
SPA_TYPE_POS_MF_2xOC12
SPA_TYPE_POS_MF_4xOC12
SPA_TYPE_POS_MF_8xOC12
SPA_TYPE_POS_SRP_OC192
SPA_TYPE_POS_SRP_OC192_XFP
SPA_TYPE_POS_SRP_1xOC48
SPA_TYPE_POS_SRP_2xOC48
SPA_TYPE_POS_SRP_4xOC48