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Monitoring Multichannel DS3 Interfaces

 

Checklist for Monitoring Multichannel DS3 Interfaces

Purpose

To monitor Multichannel DS3 interfaces and begin the process of isolating Multichannel DS3 interface problems when they occur.

Action

Table 1 provides the links and commands for monitoring Multichannel DS3 interfaces.

Table 1: Checklist for Monitoring Multichannel DS3 Interfaces

Tasks

Command or Action

Monitor Multichannel DS3 Interfaces
  1. Display the Status of Channelized Interfaces

show interfaces terse ds*

show interfaces terse t1*

  1. Display the Status of a Specific Channelized Interface

show interfaces ds-fpc/pic/port:channel:channel

show interfaces t1-fpc/pic/port:channel

  1. Display Extensive Status Information for a Specific T3 Interface

show interfaces ds-fpc/pic/port:channel:channel extensive

show interfaces t1-fpc/pic/port:channel extensive

  1. Monitor Statistics for a Channelized Interface

monitor interfaces ds-fpc/pic/port:channel:channel

monitor interfaces t1-fpc/pic/port:channel

Monitor Multichannel DS3 Interfaces

Channelized interfaces enable you to configure a number of individual channels that subdivide the bandwidth of a larger interface and minimize the number of Physical Interface Cards (PICs) that an installation requires. By monitoring channelized DS3 to DS0 interfaces or channelized DS3 to DS1 interfaces, you can begin to isolate Multichannel DS3 problems when they occur.

To monitor Multichannel DS3 interfaces, follow these steps:

  1. Display the Status of Channelized Interfaces

  2. Display the Status of a Specific Channelized Interface

  3. Display Extensive Status Information for a Specific T3 Interface

  4. Monitor Statistics for a Channelized Interface



Display the Status of Channelized Interfaces

Purpose

To display the status of channelized DS3 to DS0 interfaces or channelized DS3 to DS1 interfaces, use one of the following Junos OS command-line interface (CLI) operational mode commands:

Action

Sample Output

The following sample output is for a channelized DS3 to DS0 interface:

The following sample output is for a channelized DS3 to DS1 interface:

Meaning

The sample output shows the status of both the physical and logical interfaces. In both sample outputs, all links are up except for the first interface in the T1 sample output. The first interface, t1-2/1/0:16, has both the physical and logical links down.



Display the Status of a Specific Channelized Interface

Purpose

To display the status of a specific channelized DS3 to DS0 interface or channelized DS3 to DS1 interface, use one of the following CLI operational mode commands:

Action

Sample Output

The following sample output is for a channelized DS3 to DS0 interface:

The following sample output is for a channelized DS3 to DS1 interface:

Meaning

The first line of the sample output shows the status of the link. If this line shows that the physical link is up, the physical link is healthy and can pass packets. If this line shows that the physical link is down, the physical link is unhealthy and cannot pass packets.



Display Extensive Status Information for a Specific T3 Interface

Purpose

To display extensive status information about a specific channelized DS3 to DS0 interface or channelized DS3 to DS1 interface, use one of the following CLI operational mode commands:

Action

Sample Output

The following sample output is for a channelized DS3 to DS0 interface:

The following sample output is for a channelized DS3 to DS1 interface:

Meaning

The sample output shows where the errors might be occurring. Look at the active alarms and active defects for the DS1 or DS3 interface and diagnose the media accordingly. See Checklist for Locating Multichannel DS3 Alarms and Errors for an explanation of Multichannel DS3 alarms.



Monitor Statistics for a Channelized Interface

Purpose

To monitor statistics for a channelized DS3 to DS0 interface or channelized DS3 to DS1 interface, use one of the following CLI operational mode commands:

Action

Sample Output

The following sample output is for a channelized DS3 to DS0 interface:

The following sample output is for a channelized DS3 to DS1 interface:

Meaning

This command checks for and displays common interface failures, indicates whether loopback is detected, and shows increases in framing errors. Use information from this command to help 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.

Table 2 lists additional problem situations and actions to help you further understand an interface problem.

Table 2: Problem Situations and Actions

Problem Situation

Action

Framing errors are increasing.

Check the frame checksum sequence (FCS), scrambling, and subrate configuration.

Framing errors are increasing, and the configuration is correct.

Check the cabling to the router and have the carrier verify the integrity of the line.

Input errors are increasing.

Check the cabling to the router and have the carrier verify the integrity of the line.

Note

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.