Table Of Contents
POS Alarm Trigger Delay on the Cisco 7304 Router
Related Features and Technologies
Supported Standards, MIBs, and RFCs
Setting POS Alarm Delay for Line Level Triggers
Setting Path Level Triggers as Alarms and Enabling POS Alarm Delay for Path Level Triggers
Verifying POS Alarm Trigger Delay Configuration
POS Alarm Trigger Delay on the Cisco 7304 Router
Feature History
This feature module describes the POS Alarm Trigger Delay feature for the Cisco 7304 router and includes information on the benefits of the new feature, supported platforms, configuration tasks, and a command reference.
This document includes the following sections:
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Supported Standards, MIBs, and RFCs
Feature Overview
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 milliseconds (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:
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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:
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The POS Alarm Trigger Delay feature can be used to configure path alarm indication signals and path remote defect indication as triggers, as well as to configure the exact POS alarm trigger delay for these triggers. The default delay values for path alarm indication signals and path remote defect indications, if no value is specified, is also 100 ms.
Beginning with Cisco IOS Release 12.(31)SB13, B3 TCA alarms will bring down the line protocol immediately regardless of the configured delay time if pos delay trigger path command is configured; the configured trigger delay time is not applicable to B3 TCA alarms. If pos delay trigger path command is not configured, B3 TCA alarms will not bring the line down. In releases prior to Cisco IOS Release 12.2(31)SB13, B3 TCA alarms are not triggers for the line protocol to go down by default.
Benefits
POS Line Card Uptime
The POS Alarm Trigger Delay feature delays the setting of the line protocol to down when trigger alarms are received. If the trigger alarm was sent because of an intermittent problem, the POS Alarm Trigger Delay can prevent the line protocol from going down when the line protocol was functional. Therefore, the POS Alarm Trigger Delay helps ensure uptime of POS line cards on the Cisco 7304 router by preventing intermittent problems from disabling the line protocol.
Restrictions
This command is invalid for interfaces that are configured as APS working or protected.
Related Features and Technologies
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Related Documents
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Supported Platforms
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This documentation only covers the POS Alarm Trigger Delay feature on the Cisco 7304 Router. See the Configuring SONET Delay Triggers document for information on configuring this feature on other platforms.
Determining Platform Support Through Feature Navigator
Cisco IOS software is packaged in feature sets that support specific platforms. To get updated information regarding platform support for this feature, access Feature Navigator. Feature Navigator dynamically updates the list of supported platforms as new platform support is added for the feature.
Feature Navigator is a web-based tool that enables you to quickly determine which Cisco IOS software images support a specific set of features and which features are supported in a specific Cisco IOS image.
To access Feature Navigator, you must have an account on Cisco.com. If you have forgotten or lost your account information, send a blank e-mail to cco-locksmith@cisco.com. An automatic check will verify that your e-mail address is registered with Cisco.com. If the check is successful, account details with a new random password will be e-mailed to you. Qualified users can establish an account on Cisco.com by following the directions at https://tools.cisco.com/RPF/register/register.do.
Feature Navigator is updated regularly when major Cisco IOS software releases and technology releases occur. For the most current information, go to the Feature Navigator home page at the following URL:
Supported Standards, MIBs, and RFCs
Standards
No new or modified standards are supported by this feature.
MIBs
No new or modified MIBs are supported by this feature.
To obtain lists of supported MIBs by platform and Cisco IOS Release, and to download MIB modules, go to the Cisco MIB web site on cisco.com at the following URL:
http://www.cisco.com/public/sw-center/netmgmt/cmtk/mibs.shtml
RFCs
No new or modified RFCs are supported by this feature.
Prerequisites
None. This feature should work on all Cisco 7304 POS interfaces running Cisco IOS Release 12.1(12c)EX or later.
Configuration Tasks
See the following sections for configuration tasks for the POS Alarm Trigger Delay feature:
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Setting POS Alarm Delay for Line Level Triggers
The following procedure shows how to configure the delay time for a line level alarm to set the line card protocol to down. The following alarms are considered line level alarms that act as triggers: section loss of signal, section loss of frame, and line alarm indication signal.
Setting Path Level Triggers as Alarms and Enabling POS Alarm Delay for Path Level Triggers
The following procedure shows how to enable path level alarms as triggers, and how to set the alarm trigger delay for path level triggers if a delay is desired.
Verifying POS Alarm Trigger Delay Configuration
The following commands can be used to verify if POS Alarm Trigger Delay is enabled:
Shows the content of POS controllers, including the amount of delay for line triggers.
Configuration Examples
Setting the POS Line Level Triggers Delay
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 terminalEnter configuration commands, one per line. End with CNTL/Z.Router(config)# interface pos 1/0Router(config-if)# pos delay triggers line 50Setting Path Level Triggers as Alarms and Configuring Path Level Trigger Delay
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 terminalEnter configuration commands, one per line. End with CNTL/Z.Router(config)# interface pos 1/0Router(config-if)# pos delay triggers path 110
Verifying POS Alarm Trigger Delay
In the following example, the show controllers pos 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 detailPOS4/0
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...Command Reference
This section documents the modified command introduced by this feature. All other commands used with this feature are documented in the Cisco IOS Release 12.1 Command Reference publications.
pos delay triggers
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 POS interface configuration command. 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
Defaults
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 the pos delay triggers line 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 pos delay triggers path command has been entered.
If no ms value is entered but pos delay triggers line command is configured, the default ms value for line level triggers is 100 ms.
If no ms value is entered and pos delay triggers path is enabled, the default ms value is set at 100 ms for path level triggers.
Command Modes
POS Interface configuration
Command History
12.1(12c)EX1
This command was introduced for Cisco 7304 routers.
12.2(18)S
This command was introduced on Cisco 7304 routers running Cisco IOS Release 12.2 S.
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:
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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:
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The POS Alarm Trigger Delay feature can be used to configure path alarm indication signals and path remote defect indication as triggers, as well as to configure the exact POS alarm trigger delay for these triggers. The default delay values for path alarm indication signals and path remote defect indications, if no value is specified, is also 100 ms.
Beginning with Cisco IOS Release 12.(31)SB13, B3 TCA alarms will bring down the line protocol immediately regardless of the configured delay time if pos delay trigger path command is configured; the configured trigger delay time is not applicable to B3 TCA alarms. If pos delay trigger path command is not configured, B3 TCA alarms will not bring the line down. In releases prior to Cisco IOS Release 12.2(31)SB13, B3 TCA alarms are not triggers for the line protocol to go down by default.
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 terminalEnter configuration commands, one per line. End with CNTL/Z.Router(config)# interface pos 1/0Router(config-if)# pos delay triggers line 50In the following configuration example, the POS line card will not wait for 110 ms before setting the line protocol to down for a B3 TCA alarm.
Router# configure terminalEnter configuration commands, one per line. End with CNTL/Z.Router(config)# interface pos 1/0Router(config-if)# pos delay triggers path 110
In the following example, the show controllers pos 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 detailPOS4/0
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...Related Commands
show controllers pos slot/interface-number detail
Shows the content of POS controllers, including the amount of delay for line triggers.
Glossary
alarm—A notification that a rising or falling threshold has been crossed.
trigger—An alarm that, when asserted, causes the line protocol to go down.
Guest