Setting Up and Enabling Loopbacks

Updated on 25 Sep 2024
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Follow the steps below to set up a local loopback:

Create a filter that specifies the matching criteria for capturing traffic (applies to custom loopbacks only).
Create the loopback, as explained in the following procedure.

▶ To set up a local loopback

Access the page Loopback ▶ Configuration.
A summary of all OAM loopback instances that have been set up is displayed.
To add a new instance, click Add, or click an instance’s Name to edit its settings.
Enter values in the required fields, then click Apply.

For more information on specific parameters, refer to the following table.

Note: Only the fields listed in the following table are required for a local loopback. Leave all other fields at their default settings.

Loopback (Loopback ▶ Configuration)

Parameter	Description
Name	The OAM Loopback instance name, as defined in the page
Device	The name of the remote device to which the loopback applies
Port	The port on the remote device to which the loopback operation applies. Both UNI and NNI ports are supported.
State	The current state of the loopback, either Enabled or Disabled. Default value: Disabled
Loopback enable	Select this box to activate this loopback instance, then choose the Type from the drop-down list. Note: Upon a Sensor Control reboot or a firmware upgrade/downgrade, any previously enabled loopback will be disabled.
Type	Type may be one of the following: Custom: Loops back all traffic that matches the user-defined filter (Filter Type and related fields)
Filter type	The type of filter to be applied to the loopback traffic: L2 Filter IPv4 Filter IPv6 Filter
L2 filter	The L2 filter to be applied to loopback traffic, if the filter type is L2 Filter. All L2 filter parameters are supported.
IPv4 filter	The IPv4 filter to be applied to loopback traffic, if the filter type is IPv4 Filter. All IPv4 filter parameters are supported.
IPv6 filter	The IPv6 filter to be applied to loopback traffic, if the filter type is IPv6 Filter. All IPv6 filter parameters are supported.
Actions	The action may be one or more of the following: Swap MAC Addresses: Swaps the source and destination MAC addresses Swap IP Addresses: Swaps the source and destination IP addresses Swap TCP/UDP Ports: Swaps the source and destination TCP/UDP ports
Drop opposite traffic	Enable this option to drop the traffic entering the device on the opposite port. If this option is not enabled, opposite traffic will be restored five seconds after the loopback times out. Note: Enabling this option interrupts the Ethernet service in one direction.

Remote Loopback Enable

Parameter	Description
JDSU/Acterna™	Select this box to indicate that this remote loopback will be controlled by a JDSU/Acterna™ device.
Enable Discovery Loop Commands	Select this box to indicate that this remote loopback will accept JDSU/Acterna™ discovery loopback commands.
Loop Up Timeout	The timeout period after the Loop Up command has been received before initiating the JDSU loopback tests.

Parameter

Description

JDSU/Acterna™

Select this box to indicate that this remote loopback will be controlled by a JDSU/Acterna™ device.

Enable Discovery

Loop Commands

Select this box to indicate that this remote loopback will accept JDSU/Acterna™ discovery loopback commands.

Loop Up Timeout

The timeout period after the Loop Up command has been received before initiating the JDSU loopback tests.

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