To enable a POS alarm trigger delay, or to enable path level alarms as triggers to bring the POS line card protocol to down,
use the pos delay triggers command in POS interface configuration mode. To disable POS alarm trigger delays, use the no form of this command.
pos delay triggers [line ms | path ms]
no pos delay triggers [line ms | path ms]
Syntax Description
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line
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Specifies the delay for SONET line level triggers. The following alarms are considered line level triggers: section loss of
signal, section loss of frame, line alarm indication signal.
SONET line level triggers bring the line protocol down by default
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path
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Specifies that SONET path level alarms should trigger the line protocol to go down.
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ms
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Specifies the time, in milliseconds, that POS trigger should wait before setting the line protocol to down. If no ms value is entered, the default value of 100 ms is used.
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Command Default
POS line level alarm triggers are enabled by default. If a POS line level alarm trigger occurs and no configuration changes
have been made using theposdelaytriggersline ms command, the line protocol is set to down immediately with no delay.
POS path level alarm triggers are disabled by default. A path level alarm will not set the line protocol to down unless the
posdelaytriggerspath command has been entered.
If no ms value is entered but posdelaytriggersline command is configured, the default ms value for line level triggers is 100 ms.
If no ms value is entered and posdelaytriggerspath is enabled, the default ms value is set at 100 ms for path level triggers.
Command Modes
POS interface configuration
Command History
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Release
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Modification
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12.1(12c)EX1
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This command was introduced for Cisco 7304 routers.
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12.2(18)S
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This command was introduced on Cisco 7304 routers running Cisco IOS Release 12.2S.
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12.2(33)SRA
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This command was integrated into Cisco IOS Release 12.2(33)SRA.
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12.2SX
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This command was integrated into Cisco IOS Release 12.2SX train. Support in a specific 12.2SX release of this train depends
on your feature set, platform, and platform hardware.
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12.4
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This command was integrated into Cisco IOS Release 12.4 Mainline. This command supports Cisco 7200 Series, Cisco 7304 Series,
and Cisco 7600 Series routers.
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12.4(24)T
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This command was integrated into a release earlier than Cisco IOS Release 12.4(24)T. This command supports Cisco 7200 Series,
Cisco 7304 Series, and Cisco 7600 Series routers.
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Usage Guidelines
A trigger is an alarm that, when asserted, causes the line protocol to go down.
When one or more triggers are asserted, the line protocol of the interface goes down. The POS Alarm Trigger Delay feature
provides the option to delay triggering of the line protocol of the interface from going down when an alarm triggers the line
protocol to go down. For instance, if you configure the POS alarm delay for 150 ms, the line protocol will not go down for
150 ms after receiving the trigger. If the trigger alarm stays up for more than 150 ms, the link is brought down as it is
now. If the trigger alarm clears before 150 ms, the line protocol is not brought down.
By default, the following line and section alarms are triggers for the line protocol to go down:
For line and section alarm triggers, the line protocol of the POS card is brought down immediately if a trigger is received
and no POS alarm trigger delay is specified. The delay can be set anywhere from 50 to 10000 ms. If POS alarm triggering is
configured but no ms value is entered, the POS alarm trigger delay is 100 ms.
The following path alarms are not triggers by default. These path alarms, however, can be configured as triggers:
The POS Alarm Trigger Delay feature can be used to configure these alarms as triggers, as well as to configure the exact POS
alarm trigger delay for these triggers. The default delay values for these triggers, if no value is specified, is also 100
ms.
Examples
In the following configuration example, the POS line card will wait 50 ms after receiving a line level trigger before setting
the line protocol to down. If the alarm that began the line level trigger clears during that 50 ms, the line protocol will
remain up. If the alarm that began the line trigger remains after that 50 ms, the line protocol will go down.
Router# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)# interface pos 1/0
Router(config-if)# pos delay triggers line 50
In the following configuration example, the POS line card will wait 110 ms after receiving a path trigger before setting the
line protocol to down. If the alarm that began the path trigger clears during that 110 ms, the line protocol will remain up.
If the alarm that began the path trigger remains after 110 ms, the line protocol will go down.
Router# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)# interface pos 1/0
Router(config-if)# pos delay triggers path 110
In the following example, the showcontrollerspos slot /interface-number detail command is used to verify the POS alarm trigger delay. In this particular example, the delay is 100 ms (italicized for emphasis
below) for both line level triggers and path level triggers.
Router# show controllers pos 4/0 detail
POS4/0
SECTION
LOF = 0 LOS = 0 BIP(B1) = 22
LINE
AIS = 0 RDI = 0 FEBE = 21 BIP(B2) = 38
PATH
AIS = 0 RDI = 1 FEBE = 25 BIP(B3) = 31
PLM = 0 UNEQ = 0 TIM = 0 TIU = 0
LOP = 0 NEWPTR = 4 PSE = 2 NSE = 3
Active Defects:None
Active Alarms: None
Alarm reporting enabled for:SF SLOS SLOF B1-TCA B2-TCA PLOP B3-TCA
Line triggers delayed 100 ms
Path triggers delayed 100 ms
...
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