Network Router User Manual
4-21
Layer 3 Switching Software Feature and Configuration Guide
78-6235-04, Cisco IOS Release 12.0(10)W5(18)
Chapter 4 Configuring Interfaces
Configuring the POS OC-12c Uplink Interface (Catalyst 8540)
Configuring SONET Delay Triggers
A trigger is an alarm, which when asserted causes the line protocol to go down.
Line and Section Triggers
Table 4-2 lists the line and section alarms that are triggers by default:
When one or more of the alarms in Table 4-2 are asserted, the line protocol of the interface goes down
without a delay. You can issue a pos delay triggers line command to delay triggering the line protocol
of the interface from going down. You can set the delay from 50 to 10000 ms. If you do not specify a
time interval, the default delay is set to 100 ms.
Path Level Triggers
Table 4-3 lists path alarms that are not triggers by default. You can configure these path alarms as
triggers and also specify a delay.
You can issue the pos delay triggers path command to configure the path alarms listed in Table 4-3 as
triggers. These triggers will bring down the line protocol of the interface. When you configure the path
alarms as triggers, you can simultaneously specify a delay for the triggers. You can set the delay from
50 to 10000 ms. If you do not specify a time interval, the default delay is set to 100 ms.
The pos delay triggers path configuration can also bring the line protocol of the interface down when
the higher of the B2 and B3 error rates is compared with the SF (signal failure) threshold. If the SF
threshold is crossed, then the line protocol of the interface goes down.
Table 4-2 Default Line and Section Alarm Triggers
Alarm Description
SLOS Section loss of signal
SLOF Section loss of frame
AIS-L Line alarm indication signal
Table 4-3 Configurable Path Alarm Triggers
Alarm Description
AIS-P Path alarm indication signal
RDI-P Path remote defect indication
LOP-P Path loss of pointer