It is based on power up as far as I can tell.  After a firmware update all the switches in my fleet all start over with new uptime counters. ... View more

If you want to see uptime on Meraki devices use SNMP.  OID's are: 1.3.6.1.2.1.1.1.0 - System Name 1.3.6.1.2.1.1.5.0 - Host Name 1.3.6.1.2.1.1.3.0 - Uptime   Configure SNMP v2c in the Meraki dashboard. Build your own SNMP dash board with SNMP View 2.5 or similar to poll the SNMP information from the devices.   This will show uptime for Meraki switches, but will not show uptime for Meraki MX's - I know, Right?!     ... View more

ShoreTel Phones of the IP480, IP485 models by default have power settings that go into a low power sleep mode at roughly 20:00 hours and they awake at 07:00 hours.  When they awake they usually drop the port they are connected to.  I have seen this in SYSLOG on Legacy Cisco switches, and it likely will do the same to Meraki switches also.  Teaching the phones the following setting stops this:     [power] sleepEthernetLowPower=off     ... View more