Cisco 3845 - Security Bundle Router Software Manual page 132

Understanding SyncE
Figure 6-2
Switch 3
Figure 6-3
network.
Figure 6-3
Switch 3
When you configure the SyncE REP workaround, you can configure these SyncE features:
Hold-off timeout—If a clock source goes down, the switch holds the fail signal for a specific time
•
period before removing the source and restarting the synchronization process. Configure the
hold-off timeout by entering the network-clock-select hold-off timeout global configuration
command.
Wait-to-restore timeout—If a failed SyncE source comes up, the switch waits for a specific time
•
period of time before considering the source as available in the selection process. The default time
is 300 seconds. Configure wait-to-restore timeout by entering the network-clock-select
wait-to-restore global configuration command.
Cisco ME 3800X and 3600X Switch Software Configuration Guide
6-4
Broken Network Link
Switch 4
Priority 2
Priority 1
Priority 2
Blocked
Priority 2
Switch 2
Priority 2
Priority 1
Data path
Timing path
shows how the REP segment handles the broken link to avoid timing loops in the SyncE
SyncE REP Segment
Switch 4
Priority 2
Priority 1
Priority 2
Priority 2
Switch 2
Priority 2
Priority 1
Data path
Timing path
Priority 1
REP Edge
Switch 1
Priority 1
Priority 1
REP Edge
Switch 1
Priority 1
Chapter 6 Configuring Synchronous Ethernet
Router 1
REP Edge
Port
Reference
Port
Router 2
Router 1
REP Edge
Port
Reference
Port
Router 2
Clock
Clock
OL-23400-01