Understanding Loopback Testing
  • 09 Aug 2024
  • 1 Minute to read
  • Contributors
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Understanding Loopback Testing

  • PDF

Article summary

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.

1.bmp

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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