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Testing Interfaces
Loopback Testing
loopback
Testing Connectivity
path overhead j1
Copyright © 2010, Juniper Networks, Inc.
Use the no version to revert to the original working interface.
See aps manual.
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.
To configure loopback testing at the SONET/SDH level, use "loopback" on page 93.
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.
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:
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.
When you define a message that the interface sends, you must monitor receipt of that
message at the remote end.
When you define a message that the interface expects to receive, you should configure
the remote device to transmit the same message to the interface. You can then use the
show controllers sonet command to compare the expected and receive messages.
You must remove trace messages before you can change the port type from SONET to
SDH or vice versa. Otherwise, you see the following error message:
% Cannot set port mode (path trace message is set)
Chapter 3: Configuring Unchannelized OCx/STMx Interfaces
93
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