modes (configured-quality and received-quality), the interface qualifies for clock source
selection only when the received ESMC SSM quality level on the interface is equal to or
greater than the configured ESMC SSM quality level for the interface. To configure the
ESMC SSM quality-based clock source selection mode, use the following command:
set chassis synchronization selection-mode (configured-quality | received-quality)
The following output shows the configuration of the selection-mode statement with the
configured-quality option and the mandatory quality-mode-enable statement:
[edit]
user@host# show chassis
synchronization {
selection-mode configured-quality;
quality-mode-enable;
}
NOTE: For the selection-mode statement configuration to take effect, you
must set the quality-mode-enable statement at the [edit chassis
synchronization] hierarchy level.
Setting the time interval before a new clock source is selected
For routers operating with Synchronous Ethernet , set the time interval to wait before the
router selects a new clock source. After a change in the configuration, the time to wait
is between 15 and 60 seconds. After a reboot (restart), the time to wait is from 60 to 180
seconds. After clock recovery (switchover), the time to wait is from 30 to 60 seconds.
The default switchover time is 30 seconds and cold boot time is 120 seconds. To set the
time interval before a new clock source is selected, use the following command:
set chassis synchronization hold-interval (configuration-change | restart |
switchover) seconds
The following output shows the configuration of the hold-interval statement with the
configuration-change option:
[edit]
user@host# show chassis
synchronization {
hold-interval {
configuration-change 20;
}
}
Setting the synchronization switching mode
The configured switching mode determines the clock source used. In revertive mode, the
system switches from a lower to a higher quality clock source whenever the higher clock
source becomes available. In non-revertive mode, the system continues to use the current
clock source as long as it is valid. The default mode is revertive. To set the synchronization
switchover mode, use the following command:
set chassis synchronization switchover-mode (revertive | non-revertive)
Copyright © 2017, Juniper Networks, Inc.230
ACX Series Universal Access Router Configuration Guide
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