Table of Contents

About This Guide

Objectives

Audience

Supported Routing Platforms

Using the Index

Using the Examples in This Manual

Document Conventions

List of Technical Publications

Documentation Feedback

Requesting Technical Support

Overview of Interfaces

Interfaces Overview

Interfaces Covered in These Topics

T1 Interfaces

T3 Interfaces

ATM Interfaces

SONET Interfaces

Fast Ethernet and Gigabit Ethernet Interfaces

Channelized Interfaces

Interfaces Supported by the JUNOS Software

Interface Descriptors

Interface Naming

Interface and Router Clock Sources

Investigate Interface Steps and Commands

Investigate Interface Steps

Monitor Interfaces

Perform a Loopback Test on an Interface

Locate Interface Alarms

Investigate T1 Interfaces

Monitor T1 Interfaces

Checklist for Monitoring T1 Interfaces

Monitor T1 Interfaces

Display the Status of T1 Interfaces

Display the Status of a Specific T1 Interface

Display Extensive Status Information for a Specific T1 Interface

Monitor Statistics for a T1 Interface

Use Loopback Testing for T1 Interfaces

Checklist for Using Loopback Testing for T1 Interfaces

Diagnose a Suspected Hardware Problem with a T1 Interface

Create a Loopback

Create a Physical Loopback

Configure a Local Loopback

Set Clocking to Internal

Verify That the T1 Interface Is Up

Clear T1 Interface Statistics

Force the Link Layer To Stay Up

Configure Encapsulation to Cisco-HDLC

Configure No-Keepalives

Verify the Status of the Logical Interface

Ping the T1 Interface

Check for T1 Interface Error Statistics

Diagnose a Suspected Circuit Problem

Create a Loop from the Router to the Network

Create a Loop to the Router from Various Points in the Network

Locate T1 Alarms and Errors

Checklist for T1 Alarms and Errors

Display T1 Alarms and Errors

Locate Most Common T1 Alarms and Errors

Locate Loss of Signal and Loss of Frame Alarms

Locate Alarm Indication Signal Alarms

Locate an Incoming Yellow Alarm

Investigate T3 Interfaces

Monitor T3 Interfaces

Checklist for Monitoring T3 Interfaces

Monitor T3 Interfaces

Display the Status of T3 Interfaces

Display the Status of a Specific T3 Interface

Display Extensive Status Information for a Specific T3 Interface

Monitor Statistics for a T3 Interface

Use Loopback Testing for T3 Interfaces

Checklist for Using Loopback Testing for T3 Interfaces

Diagnose a Suspected Hardware Problem with a T3 Interface

Create a Loopback

Create a Physical Loopback

Configure a Local Loopback

Set Clocking to Internal

Verify That the T3 Interface Is Up

Clear T3 Interface Statistics

Force the Link Layer To Stay Up

Configure Encapsulation to Cisco-HDLC

Configure No-Keepalives

Verify the Status of the Logical Interface

Ping the T3 Interface

Check for T3 Interface Error Statistics

Diagnose a Suspected Circuit Problem

Create a Loop from the Router to the Network

Create a Loop to the Router from Various Points in the Network

Locate T3 Alarms and Errors

Checklist of Common T3 Alarms and Errors

Display T3 Alarms and Errors

Locate Most Common T3 Alarms and Errors

Locate Loss of Signal and Loss of Frame Alarms

Locate Alarm Indication Signal Alarms

Locate an Incoming Yellow Alarm

Locate IDLE on a T3 Interface

Investigate ATM Interfaces

Determine ATM Interface Type

Checklist for Determining ATM Interface Type

Determine the ATM Interface Type and Configuration

Determine the ATM Interface Type

Check that the ATM Configuration Is Correct

Check the Configuration of an ATM1 Interface

Check the Configuration of an ATM2 IQ Interface

Examples of Incorrect Configurations of ATM Options

Check the Configuration of the VCI on an ATM1 Interface

Check the Configuration of the VCI on an ATM2 IQ Interface

Check the Configuration of Promiscuous Mode on an ATM2 IQ Interface

Monitor ATM Interfaces

Checklist for Monitoring ATM Interfaces

Monitor ATM Interfaces

Monitor ATM1 Interfaces

Display the Status of a Specific ATM1 Interface

Display Extensive Status Information for a Specific ATM1 Interface

Monitor Statistics for an ATM1 Interface

Monitor ATM2 IQ Interfaces

Display the Status of a Specific ATM2 IQ Interface

Display Extensive Information for a Specific ATM2 Interface

Monitor Statistics for an ATM2 Interface

Use Loopback Testing for ATM Interfaces

Checklist for Using Loopback Testing for ATM Interfaces

Diagnose a Suspected Hardware Problem with an ATM1 or ATM2 IQ Interface

Create a Loopback

Create a Physical Loopback

Configure a Local Loopback

Set Clocking to Internal

Verify That the ATM Interface Is Up

Clear ATM Interface Statistics

Ping the ATM Interface

Check for ATM Interface Error Statistics

Diagnose a Suspected Circuit Problem

Create a Loop from the Router to the Network

Create a Loop to the Router from Various Points in the Network

Locate ATM Alarms and Errors

List of Common ATM Alarms and Error

Display ATM1 and ATM2 Alarms and Errors

Investigate SONET Interfaces

Monitor SONET Interfaces

Checklist for Monitoring SONET Interfaces

Monitor SONET Interfaces

Display the Status of SONET Interfaces

Display the Status of a Specific SONET Interface

Display Extensive Status Information for a Specific SONET Interface

Monitor Statistics for a SONET Interface

Use Loopback Testing for SONET Interfaces

Checklist for Using Loopback Testing for SONET Interfaces

Diagnose a Suspected Hardware Problem with a SONET Interface

Create a Loopback

Create a Physical Loopback

Configure a Local Loopback

Set Clocking to Internal

Verify That the SONET Interface Is Up

Clear SONET Interface Statistics

Check That the Received and Transmitted Path Trace Are the Same

Force the Link Layer to Stay Up

Configure Encapsulation to Cisco-HDLC

Configure No-Keepalives

Verify the Status of the Logical Interface

Ping the SONET Interface

Check for SONET Interface Error Statistics

Diagnose a Suspected Circuit Problem

Create a Loop from the Router to the Network

Create a Loop to the Router from Various Points in the Network

Locate SONET Alarms and Errors

List of Common SONET Alarms and Errors

Display SONET Alarms and Errors

Locate Most Common SONET Alarms and Errors

Locate Loss of Signal Alarms

Locate Alarm Indication Signal Alarms

Example of a Router Receiving Only an AIS-P Alarm

Example of a Router Receiving Both an AIS-L and AIS-P Alarm

Locate Remote Defect Indication Alarms

Example of a Router Receiving Only an RDI-P Alarm

Example of a Router Receiving Both an RDI-L and RDI-P Alarm

Locate Remote Error Indication Line Errors

Example of Only an REI-P Counter Incrementing

Example of Both REI-L and REI-P Counters Incrementing

Locate Bit Error Rate Alarms

Locate Payload Label Mismatch Path Alarms

Locate Loss of Pointer Path Alarms

Locate Unequipped Payload Alarms

Locate Phase Lock Loop Alarms

Enable SONET Payload Scrambling

Checklist for Enabling SONET Payload Scrambling

Understand SONET Payload Scrambling

Check SONET HDLC Payload Scrambling

Configure SONET HDLC Payload Scrambling

Check the SONET Frame Checksum

Checklist for Checking the SONET Frame Checksum

Understand the SONET Frame Checksum

Check the SONET Frame Checksum

Examine Output for Framing Errors

Check the FCS Configuration

Configure a SONET Frame Checksum

Return to the Default 16-Bit Checksum

Configure a 16-Bit Checksum

Configure a 32-Bit Checksum

Investigate Fast Ethernet and Gigabit Ethernet Interfaces

Monitor Fast Ethernet and Gigabit Ethernet Interfaces

Checklist for Monitoring Fast Ethernet and Gigabit Ethernet Interfaces

Monitor Fast Ethernet and Gigabit Ethernet Interfaces

Display the Status of Fast Ethernet and Gigabit Ethernet Interfaces

Display the Status of a Specific Fast Ethernet or Gigabit Ethernet Interface

Display Extensive Status Information for a Specific Fast Ethernet or Gigabit Ethernet Interface

Monitor Statistics for a Fast Ethernet or Gigabit Ethernet Interface

Fiber-Optic Ethernet Interface Specifications

Use Loopback Testing for Fast Ethernet and Gigabit Ethernet Interfaces

Checklist for Using Loopback Testing for Fast Ethernet and Gigabit Ethernet Interfaces

Diagnose a Suspected Hardware Problem with a Fast Ethernet or Gigabit Ethernet Interface

Create a Loopback

Create a Physical Loopback for a Fiber-Optic Interface

Create a Loopback Plug for an RJ-45 Ethernet Interface

Configure a Local Loopback

Verify That the Fast Ethernet or Gigabit Ethernet Interface Is Up

Configure a Static Address Resolution Protocol Table Entry

Clear Fast Ethernet or Gigabit Ethernet Interface Statistics

Ping the Fast Ethernet or Gigabit Ethernet Interface

Check for Fast Ethernet or Gigabit Ethernet Interface Error Statistics

Diagnose a Suspected Circuit Problem

Locate the Fast Ethernet and Gigabit Ethernet LINKAlarm and Counters

Checklist for Locating Fast Ethernet and Gigabit Ethernet Alarms and Counters

Display the Fast Ethernet or Gigabit Ethernet Interface LINK Alarm

Fast Ethernet and Gigabit Ethernet Counters

Investigate Channelized Interfaces

Monitor Channelized DS3 Interfaces

Checklist for Monitoring Channelized DS3 Interfaces

Monitor Channelized DS3 Interfaces

Display the Status of Channelized DS3 Interfaces

Display the Status of a Specific Channelized DS3 Interface

Display Extensive Status Information for a Specific Channelized DS3 Interface

Monitor Statistics for a Channelized DS3 Interface

Use Loopback Testing For Channelized DS3 Interfaces

Checklist for Using Loopback Testing for Channelized DS3 Interfaces

Diagnose a Suspected Hardware Problem with a Channelized DS3 Interface

Create a Loopback

Create a Physical Loopback

Configure a Local Loopback

Verify That the Interface Is Up

Clear Interface Statistics

Force the Link Layer to Stay Up

Configure Encapsulation to Cisco-HDLC

Configure No-Keepalives

Verify the Status of the Logical Interface

Ping the Channelized Interface

Check for Interface Error Statistics

Diagnose a Suspected Circuit Problem

Create a Loop from the Router to the Network

Create a Loop to the Router from Various Points in the Network

Locate Channelized DS3 Alarms and Errors

Checklist for Channelized DS3 Alarms and Errors

Display Alarms and Errors for Channelized DS3 Interfaces

Monitor Multichannel DS3 Interfaces

Checklist for Monitoring Multichannel DS3 Interfaces

Monitor Multichannel DS3 Interfaces

Display the Status of Channelized Interfaces

Display the Status of a Specific Channelized Interface

Display Extensive Status Information for a Specific T3 Interface

Monitor Statistics for a Channelized Interface

Use Loopback Testing for Multichannel DS3 Interfaces

Checklist for Using Loopback Testing for Multichannel DS3 Interfaces

Diagnose a Suspected Hardware Problem with a Multichannel DS3 Interface

Create a Loopback

Create a Physical Loopback

Configure a Local Loopback

Verify That the Interface Is Up

Clear Interface Statistics

Force the Link Layer to Stay Up

Configure Encapsulation to Cisco-HDLC

Configure No-Keepalives

Verify the Status of the Logical Interface

Ping the Channelized Interface

Check for Interface Error Statistics

Diagnose a Suspected Circuit Problem

Create a Loop from the Router to the Network

Loop the Entire T3 Interface towards the Network

Loop a Particular T1 Channel towards the Network

Create a Loop to the Router from Various Points in the Network

Locate Multichannel DS3 Alarms and Errors

for DS3 Alarms

Display Alarms and Errors for Channelized DS3 to DS1 Interfaces

Display Alarms and Errors for Channelized DS3 to DS0 Interfaces

Monitor Channelized OC12 Interfaces

Checklist for Monitoring Channelized OC12 Interfaces

Monitor Channelized OC12 Interfaces

Display the Status of Channelized OC12 Interfaces

Display the Status of a Specific Channelized OC12 Interface

Display Extensive Status Information for a Specific Channelized OC12 Interface

Monitor Statistics for a Channelized OC12 Interface

Monitor Channelized OC12 IQ Interfaces

Display the Status of a Channelized OC12 IQ Interface

Display the Status of the Controller Channelized OC12 IQ Interface

Display the Status of a Specific Channel of a Channelized OC12 IQ Interface

Display Extensive Status Information for a Channelized OC12 IQ Interface

Monitor Statistics for a Channelized OC12 IQ Interface

Use Loopback Testing for Channelized OC12 Interfaces

Checklist for Using Loopback Testing for Channelized OC12 and Channelized OC12 IQ Interfaces

Diagnose a Suspected Hardware Problem with a Channelized OC12 or Channelized OC12 IQ Interface

Create a Loopback

Create a Physical Loopback

Configure a Local Loopback

Verify That the Interface Is Up

Clear Interface Statistics

Force the Link Layer to Stay Up

Configure Encapsulation to Cisco-HDLC

Configure No-Keepalives

Verify the Status of the Logical Interface

Ping the Channelized Interface

Check for Interface Error Statistics

Diagnose a Suspected Circuit Problem

Loop the Entire T3 Interface Towards the Network

Create a Loop to the Router from Various Points in the Network

Locate Channelized OC12 Alarms and Errors

Checklist for Channelized OC12 Alarms and Errors

Display Channelized OC12 Alarms and Errors

Display Channelized OC12 IQ Alarms and Errors

Appendix

Index

Index