loopback (DWDM)
To configure the DWDM controller for loopback mode, use the loopback command in DWDM configuration
mode. To remove the loopback DWDM command from the configuration file, use the no form of this command.
loopback {internal| line}
no loopback {internal| line}
Syntax Description
Specifies that all the packets be looped back to the router.internal
Specifies that the incoming network packets be looped back to the DWDM
network.
line
Command Default
This command is disabled by default.
Command Modes
DWDM configuration
Command History
ModificationRelease
This command was introduced.Release 3.9.0
Usage Guidelines
To use this command, you must be in a user group associated with a task group that includes appropriate task
IDs. If the user group assignment is preventing you from using a command, contact your AAA administrator
for assistance.
The DWDM controller supports two loopback operation modes for diagnostic purposes: internal and line.
The terminal (internal) loopback mode allows the received data from the Layer 2 Framer (for example, a
SONET/SDH framer for POS or Ethernet MAC for 10GE) of the PLIM to be looped back to the ingress side
of the Framer. This allows the packets to be looped back to the PLIM. The line loopback mode allows the
received trunk/DWDM line Rx to be connected to the trunk/DWDM line Tx towards the line. This is used
for line diagnostics.
Task ID
OperationsTask ID
read, writedwdm
Cisco ASR 9000 Series Aggregation Services Router Interface and Hardware Component Command Reference,
Release 5.3.x
26
Dense Wavelength Division Multiplexing Commands on the Cisco ASR 9000 Series Router
loopback (DWDM)
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