We have had an MX75 in our new premises since July time last year. In the last month or so, we have been seeing frequent, albeit irregular drops of the primary internet connection for just a brief moment. The MX successfully fails over to the backup circuit, however the drop does kill our telephone sessions which are in progress at the time.
We're looking into routing VoIP traffic over the secondary all the time, so that when the switch happens it doesn't affect calls.
We have a case open with Meraki support, and our ISP. Between them we have isolated that the physical L1 connection between the ISP router and the MX is dropping out. We have since placed a managed switch in between the devices, so we can pull logs from that to see which side is dropping.
Fast forward to this morning and the link dropped at around 07:15 BST. Looking at the switch logs, we can see the port the MX is on dropped out for just over a minute, and had a bit of a flap during that period:
[Log from switch - show log Ɩ port 13]
I 28/03/22 07:16:39 00077 ports: port 13 is now off-line I 28/03/22 07:17:21 00076 ports: port 13 is now on-line I 28/03/22 07:17:24 00077 ports: port 13 is now off-line I 28/03/22 07:17:27 00076 ports: port 13 is now on-line
Has anyone seen this sort of behaviour before? We have already replaced the uplink cable, and the MX is on its own 400VA UPS to isolate it from the mains supply. I have of course updated the support case, but wanted to see if anyone in the community had any ideas or thoughts on this?