Testing Interfaces; Loopback Testing; Testing Connectivity - Juniper PHYSICAL LAYER - CONFIGURATION GUIDE V11.1.X Configuration Manual

JUNOSe 11.1.x Physical Layer Configuration Guide

Testing Interfaces

You can enable loopback tests at the SONET/SDH level. You can also test for
connectivity between an interface and the SONET/SDH interface at the other end of
the line.

Loopback Testing

To configure loopback testing at the SONET/SDH level, use "loopback" on page 96.
loopback

Testing Connectivity

Use the path overhead j1 command to check for connectivity between the router
and a SONET/SDH device at the other end of the line. This command defines:
96
Testing Interfaces
You must specify one of the following channel numbers:
0 Switches from the protect interface back to the working interface
1 Switches from the working interface to the protect interface
Examples
host1(config-controll)#aps manual 0
host1(config-controll)#aps manual 1
Use the no version to revert to the original working interface.
See aps manual.
Use to configure the type of loopback at the SONET/SDH layer.
Specify one of the following options:
local Loops the data back toward the router
network Loops the data toward the network before the data reaches the
frame.
Example
host1(config)#controller sonet 4/0
host1(config-controller)#loopback network
Use the no version to disable loopback.
See loopback.
A message that the router sends from the specified interface to the SONET/SDH
device at the other end of the line.
A message that the router expects to receive on the specified interface from the
SONET/SDH device at the other end of the line.