Cisco ASR1006 Configuration Guide - Page 344

Network Synchronization Overview Network Synchronization Support 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 SPA Type Hybrid Prowler Chopper CEOP ATM POS SPAs that support Network Synchronization SPA SPA_TYPE_HYBRID_2KP SPA_TYPE_PRO_1xCHOC3_STM1 SPA_TYPE_CHOP_1xCHOC12 SPA_TYPE_CEOP_1xOC3 SPA_TYPE_CEOP_24xT1E1 SPA_TYPE_TATM_1xOC3 SPA_TYPE_TATM_2xOC3 SPA_TYPE_TATM_3xOC3 SPA_TYPE_TATM_1xOC12 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 Cisco ASR 1000 Series Aggregation Services Routers Software Configuration Guide 4