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

Purpose

To use loopback testing to isolate Channelized OC12 and Channelized OC12 IQ interface problems. The naming convention for the Channelized OC12 IQ interface varies depending on the type of interface.

Action

Table 57 provides links and commands for using loopback testing to isolate Channelized OC12 and Channelized OC12 IQ interface problems.

Table 57: Checklist for Using Loopback Testing for Channelized OC12 and Channelized OC12 IQ Interfaces

Tasks	Command or Action
Diagnose a Suspected Hardware Problem with a Channelized OC12 or Channelized OC12 IQ Interface
Create a Loopback
Create a Physical Loopback	Connect the TX port to the RX port.
Configure a Local Loopback	[edit interfaces t3-fpc/pic/port:channel t3 options] set loopback local show commit
Verify That the Interface Is Up	show interfaces t3-fpc/pic/port:channel extensive
Clear Interface Statistics	clear interfaces statistics t3-fpc/pic/port:channel
Force the Link Layer to Stay Up
Configure Encapsulation to Cisco-HDLC	[edit interfaces t3-fpc/pic/port:channel] set encapsulation cisco-hdlc show commit
Configure No-Keepalives	[edit interfaces t3-fpc/pic/port:channel] set no-keepalives show commit
Verify the Status of the Logical Interface	show interfaces t3-fpc/pic/port:channel
Ping the Channelized Interface	ping interface t3-fpc/pic/port:channel local-IP-address bypass-routing count 1000 rapid
Check for Interface Error Statistics	show interfaces t3-fpc/pic/port:channel extensive
Diagnose a Suspected Circuit Problem
Loop the Entire T3 Interface Toward the Network	[edit interfaces t3-fpc/pic/port:channel t3-options] set loopback remote show commit
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 OC12 or Channelized OC12 IQ Interface.