Understanding Loopback Testing

Updated on 09 Aug 2024
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Layer 1–4 loopbacks (MAC address, IP address & port swap) permit remote QoS testing for Ethernet, IP/MPLS and triple-play services. Loopbacks can be established by any of the following combination of parameters:

Source or destination address
TCP/UDP port
Service level

Loopbacks can be performed in-band or out-of-band, so customer traffic continues to flow while tests are performed on selected streams.

The unit allows for two types of loopback:

Local (or private) loopback: Loops back all traffic matching the type of loopback in the setup (Iometrix L1, EXFO L2, EXFO L3, Custom).
Remotely controlled loopback: Loops back traffic and is initiated upon the reception of a predefined frame type (JDSU/Acterna™, Sunrise™).

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Setting Up and Enabling Loopbacks