Knowledge Base - Solution

Can I run a layer 2 ethernet test to a loopback or does it require another testset at the far end?

Tuesday, December 31, 2019
Submitted by ryan.grace on July 8, 2021 - 8:44pm
Problem: 
Can I run a layer 2 ethernet test to a loopback or does it require another testset at the far end?
Solution: 
If the circuit under test is layer 2 aware (switches or routers that are processing mac information) then another testset is required at the far end or some layer 2 device that can be forced into a logical (mac swapping) loopback. In a logical loopback the device will swap the source and destination mac addresses before re-transmitting the frames. If the circuit under test is pure transport equipment that is not layer 2 aware then any form of loopback (hard or soft) can be used as mac swapping is not required.

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