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Monitoring ATM Interfaces

 

Checklist for Monitoring ATM Interfaces

Purpose

To monitor Asynchronous Transfer Mode (ATM) interfaces and begin the process of isolating ATM interface problems when they occur.

Action

Table 1 provides the links and commands for monitoring ATM interfaces.

Table 1: Checklist for Monitoring ATM Interfaces

Tasks

Command or Action

Monitoring ATM Interfaces

show interfaces terse at*

Monitoring ATM1 Interfaces 
  1. Displaying the Status of a Specific ATM1 Interface

show interfaces at-fpc/pic/port

  1. Displaying Extensive Status Information for a Specific ATM1 Interface

show interfaces at-fpc/pic/port extensive

  1.  Monitoring Statistics for an ATM1 Interface

monitor interface at-fpc/pic/port

Monitoring ATM2 IQ Interfaces 
  1. Displaying the Status of a Specific ATM2 IQ Interface

show interfaces terse at-fpc/pic/port

show interfaces at-fpc/pic/port

  1. Displaying Extensive Information for a Specific ATM2 Interface

show interfaces at-fpc/pic/port extensive

  1. Monitoring Statistics for an ATM2 Interface

monitor interface at-fpc/pic/port

Monitoring ATM MIC Interfaces 
  1. Displaying the Status of a Specific ATM MIC Interface

show interfaces terse at-fpc/pic/port

show interfaces at-fpc/pic/port

  1. Displaying Extensive Information for a Specific ATM MIC Interface

show interfaces at-fpc/pic/port extensive

  1. Monitoring Traffic and Error Statistics for an ATM MIC Interface

monitor interface at-fpc/pic/port

Monitoring ATM Interfaces

Purpose

By monitoring ATM interfaces, you begin the process of isolating ATM interface problems when they occur. The following command provides the status of all ATM interfaces on the router. SeeChecklist for Determining ATM Interface Type for information on how to determine the ATM interface type.

Action

To display the status of all ATM interfaces, use the following Junos OS command-line interface (CLI) operational mode command:

Sample Output

The following sample output is for an ATM1 interface:

Meaning

The sample output lists only the ATM interfaces and shows the status of both the physical and logical interfaces. See Table 2 for a description of what the output means. You cannot determine from this output whether the interfaces are ATM1 or ATM2 intelligent queuing (IQ). SeeChecklist for Determining ATM Interface Type for information on how to determine the ATM interface type.

Table 2: Status of ATM Interfaces

Physical Interface

Logical Interface

Status Description

at-2/0/0

Admin Up

Link Up

at-2/0/0.100

Admin Up

Link Up

Both the physical and logical links are up and running on this interface. By default on an ATM interface, if the physical link is up, the logical link is also up. However, for ATM 1 or ATM2 IQ interfaces with an ATM encapsulation and OAM configured for the VC, even if the physical interface is up, the logical link for a VC can be down due to a VC misconfiguration.

at-2/0/1

Admin Up

Link Down

at-2/0/1.10

Admin Up

Link Down

The physical link is down on this interface and therefore the logical interface is down also.

Monitoring ATM1 Interfaces

To monitor an ATM1 interface, follow these steps:

  1. Displaying the Status of a Specific ATM1 Interface

  2. Displaying Extensive Status Information for a Specific ATM1 Interface

  3. Monitoring Statistics for an ATM1 Interface



Displaying the Status of a Specific ATM1 Interface

Purpose

To display the status of a specific ATM interface, use the following Junos OS CLI operational mode command:

Action

Meaning

The first line of the sample output shows that the physical link is down and therefore the logical link is down also. This means that the interface cannot pass packets.

Further down the sample output, look for active alarms and defects. If there are any, and to further diagnose the problem, see Displaying Extensive Status Information for a Specific ATM1 Interface to display more extensive information about the ATM interface and the physical interface that is down.



Displaying Extensive Status Information for a Specific ATM1 Interface

Purpose

To display extensive status information about a specific interface, use the following Junos OS CLI operational mode command:

Action

Sample Output

user@host> show interfaces at-2/0/1 extensive

Meaning

The sample output is for an OC3 ATM interface and shows the statistics for the SONET media, as well as the Input and Output ATM errors. Error details include input and output errors, active alarms and defects, and media-specific errors.

If the physical link is down, look at the active alarms and defects for the ATM interface and check the ATM media accordingly. SeeList of Common ATM Alarms and Error for an explanation of ATM alarms.



Monitoring Statistics for an ATM1 Interface

Purpose

To monitor statistics for an ATM1 interface, use the following Junos OS CLI operational mode command:

Action

Caution

We recommend that you use this command only for diagnostic purposes. Do not leave it on during normal router operations because real-time monitoring of traffic consumes additional CPU and memory resources.

Sample Output

user@host> monitor interface at-2/0/0

Meaning

The sample output checks for and displays common interface failures and any increases in framing errors. Information from this command can help you narrow down possible causes of an interface problem.

Note

If you are accessing the router from the console connection, make sure you set the CLI terminal type using the set cli terminal command.

Monitoring ATM2 IQ Interfaces

To monitor an ATM2 interface, follow these steps:

  1. Displaying the Status of a Specific ATM2 IQ Interface

  2. Displaying Extensive Information for a Specific ATM2 Interface

  3. Monitoring Statistics for an ATM2 Interface



Displaying the Status of a Specific ATM2 IQ Interface

Purpose

To display the status of a specific ATM2 IQ interface, use the following Junos OS CLI operational mode commands:

Action

Sample Output 1

user@host> show interfaces terse at-2/2/0

Sample Output 2

user@host> show interfaces at-2/2/0

Meaning

The first line of the sample output shows that the physical link and all logical links are up. This means that the interface can pass packets.

Further down the sample output, look for active alarms and defects. If there are any, and to further diagnose the problem, see Displaying Extensive Information for a Specific ATM2 Interface to display more extensive information about the ATM interface and the physical interface that is down.



Displaying Extensive Information for a Specific ATM2 Interface

Purpose

To display extensive status information about a specific ATM2 interface, use the following Junos OS CLI operational mode command:

Action

Sample Output

user@host> show interfaces at-2/2/0 extensive

Meaning

The sample output is for an OC12 ATM interface and shows the statistics for the SONET media, as well as the Input and Output ATM errors. Error details include input and output errors, active alarms and defects, and media-specific errors.

If the physical link is down, look at the active alarms and defects for the ATM interface and check the ATM media accordingly. SeeList of Common ATM Alarms and Error for an explanation of ATM alarms.



Monitoring Statistics for an ATM2 Interface

Purpose

To monitor statistics for an ATM2 interface, use the following Junos OS CLI operational mode command:

Action

Caution

We recommend that you use this command only for diagnostic purposes. Do not leave it on during normal router operations because real-time monitoring of traffic consumes additional CPU and memory resources.

Sample Output

user@host> monitor interface at-2/2/0

Meaning

The sample output checks for and displays common interface failures and any increases in framing errors. Information from this command can help you narrow down possible causes of an interface problem.

Note

If you are accessing the router from the console connection, make sure you set the CLI terminal type using the set cli terminal command.

Monitoring ATM MIC Interfaces

To monitor the status of ATM MIC interfaces, perform the following tasks:

Displaying the Status of a Specific ATM MIC Interface

Purpose

Display the status of a specific ATM MIC interface.

Action

To display the summary information about a specific ATM MIC interface:

To display the status of a specific ATM MIC interface:

Sample Output

Meaning

The first line of the sample output shows that the physical link and all logical links are up. This means that the interface can pass packets.

Further down the sample output, look for active alarms and defects. If there are any, and to further diagnose the problem, see Displaying Extensive Information for a Specific ATM MIC Interface to display more extensive information about the ATM interface and the physical interface that is down.

Table 3 lists the show interfaces terse command output fields.

Table 3: show interfaces terse Output Fields

Field Name

Field Description

Interface

Interface name.

Admin

The administrative status of the interface. Possible values: up or down.

Link

Status of the link. Possible values: up or down.

Proto

Protocol family configured on the logical interface.

Local

Local IP address of the logical interface.

Remote

Remote IP address of the logical interface.

For information about the output fields of the show interfaces command, see show interfaces (ATM).

Displaying Extensive Information for a Specific ATM MIC Interface

Purpose

Display extensive information for a specific ATM MIC interface.

Action

To display extensive status information about a specific ATM MIC interface:

Meaning

The sample output is for an OC3 ATM interface and shows the statistics for the SONET media, as well as the Input and Output ATM errors. Error details include input and output errors, active alarms and defects, and media-specific errors.

If the physical link is down, look at the active alarms and defects for the ATM interface and check the ATM media accordingly. See List of Common ATM Alarms and Error for an explanation of ATM alarms.

For information about the output fields of the show interfaces extensive command, see show interfaces (ATM).

Monitoring Traffic and Error Statistics for an ATM MIC Interface

Purpose

Monitor traffic and error statistics for an ATM MIC interface.

Action

To display real-time statistics, updated every second, for an ATM MIC interface:

Caution

We recommend that you use this command only for diagnostic purposes. If you use this command during normal router operations, additional CPU and memory resources are consumed.

Meaning

The sample output displays common interface failures and any increase in framing errors. Information from this command can help you narrow down possible causes of an interface problem.

Note

If you are accessing the router from the console connection, make sure you set the CLI terminal type using the set cli terminal command.

For information about the output fields of the monitor interfaces (ATM) command, see monitor interface.