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Purpose of EMAC Port Tests

alarson011
Level 1
Level 1

I am fiddling with an older to be recycled Cisco Catalyst Switch. When it powers on, I see something like below during startup.

POST: EMAC Loopback Test: Passed

What does this do? I thought with the loopback being performed it would suffice for a hardware test but if I mangle the port to it being unusable, I can't get this test to fail.

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