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Checklist for Using Loopback Testing for Channelized DS3 Interfaces

Purpose

Table 51 provides links and commands for using loopback testing to isolate Channelized DS3 interface problems.

Action

Table 51: Checklist for Using Loopback Testing for Channelized DS3 Interfaces

Tasks

Command or Action
Diagnose a Suspected Hardware Problem with a Channelized DS3 Interface
  1. Create a Loopback
  

Connect the TX port to the RX port.

[edit interfaces interface name (t3-options | t1-options)]
set loopback local
show
commit

  1. Verify That the Interface Is Up

show interfaces t1-fpc/pic/port:channel
 show interfaces t3-fpc/pic/port:channel

  1. Clear Interface Statistics

clear interfaces statistics t1-fpc/pic/port:channel

  1. Force the Link Layer to Stay Up
  

[edit interfaces interface-name]
set encapsulation cisco-hdlc
show
commit

[edit interfaces interface-name]
set no-keepalives
show
commit

  1. Verify the Status of the Logical Interface

show interfaces t1-fpc/pic/port:channel

  1. Ping the Channelized Interface

ping interface t1-fpc/pic/port:channel local-IP-address bypass-routing count 1000 rapid

  1. Check for Interface Error Statistics

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

Diagnose a Suspected Circuit Problem
  1.  Create a Loop from the Router to the Network

[edit interfaces t1-fpc/pic/port:channel t1-options]
set loopback remote
show
commit

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

Perform Steps 2 through 8 from Diagnose a Suspected Hardware Problem with a Channelized DS3 Interface.

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