Juniper JUNOSE 10.0.X PHYSICAL LAYER, Configuration Manual

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See show controllers sonet.
Monitoring APS/MSP
You can use the show aps commands to monitor APS/MSP.
show aps
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Use to display information about interfaces on which APS/MSP is configured.
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Use the all keyword to display information from all APS/MSP groups. In the
output, partially configured controllers are displayed with none and include only
the group name.
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Field descriptions
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sonet x/y—Location of the SONET/SDH interface
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protect group—Name of the APS group that contains the working interface
and the corresponding protect interface
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channel—Number of the APS channel; 0 identifies the protect interface, 1
identifies the working interface
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~—Interface is not currently active
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Selected—Interface is active
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~Selected—Interface is not active
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Bidirectional—Router switches to the protect interface using the bidirectional
switching mechanism
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Unidirectional—Router switches to the protect interface using the
unidirectional mode switching mechanism
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Nonrevertive—Router does not revert to the working interface when it
recovers
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Revertive—Router reverts to the working interface when it recovers
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Disabled—APS/MSP is disabled on the interface
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Enabled—APS/MSP is enabled on the interface
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Example 1
host1# show aps
sonet 5/1 protect group one channel 0 ~Selected Unidirectional
Nonrevertive
sonet 5/0 working group one channel 1 Selected Enabled
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Example 2
host1# show aps all
aps events: disabled
sonet 4/0 working group group-4 channel 1 Selected Enabled
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Monitoring SONET/SDH Interfaces
JUNOSe 10.0.x Physical Layer Configuration Guide