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Configuring SONET/SDH Defect Triggers to Be Ignored

A trigger is a defect alarm that causes a physical interface to be marked down. By default, all defects are honored with no hold time. For SONET/SDH and ATM over SONET/SDH interfaces only, you can configure individual triggers to ignore a defect, honor a defect, and apply up and down hold timers to the defect.

Table 61 lists the defects you can configure.

Table 61: SONET/SDH and ATM Active Alarms and Defects

Alarm	Description
Physical
pll	Phase-locked loop out of lock
lol	Loss of light
Section
lof	Loss of frame
los	Loss of signal
Line
ais-l	Alarm indication signal—line
rfi-l	Remote failure indication—line
ber-sd	Bit error rate defect-signal degrade
ber-sf	Bit error rate fault-signal fail
Path
ais-p	Alarm indication signal—path
locd (ATM only)	Loss of cell delineation
lop-p	Loss of pointer—path
plm-p	Payload label mismatch
rfi-p	Remote failure indication—path
uneq-p	Path unequipped

To configure defects to be ignored, include the trigger statement at the [edit interfaces interface-name sonet-options] hierarchy level:



[edit interfaces interface-name sonet-options]

trigger {

defect ignore;
}

If you configure a defect to be ignored, that defect does not contribute to the interface being marked down or up.

After you configure a defect to be ignored, the JUNOS software reevaluates the state of the defect on the interface. If the defect is outstanding and has caused the interface to be marked down, the interface is marked up.

When you configure a trigger on a low-level defect—for example, an LOS—only the low-level defect is affected. Higher-level defects that might result from the lower-level defect are not affected by the low-level trigger configuration. Therefore, you must configure higher-level defects as well.

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