A little update on this after a chat with our Cisco TAM and one of the Cisco/Meraki Technical Solutions Managers. Basically in October Cisco started rolled out an update to customer tenancies (Meraki Portal) to add the 'Degraded Ethernet Speed' Alert. While they had the data being reported previously they didnt have an alert for the circumstance. This has been rolling through each tenancy and as it hits yours, the alert got enabled and you started getting email about it. This explains the 'multiple cables failed on same time on the same day', your tenancy got the backend update.. So whereas there are some known bugs related to not negotiating at 1Gb (depending on the AP model) it is likely that other models without this bug are real 100Mbit negotiation issues, and they have advised that 50% of TAC cases are in fact faulty cables and has been confirmed. Basically, its you likely had the problem beforehand and had not noticed the slightly darker green switch port. My suggestion would be to confirm the models with the known bug via TAC case and if its not those models, do some detailed cable tests (not just a continuity test) and check they are up to scratch on quality. This nugget of information hasnt been advised clearly and does change the thinking depending on the AP model. We have a mix of both cases so are testing cables and doing RMA's. HTH
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