Hi Guys, Really appreciate your feedback or comments on this please We have a pair of MX450's (Master-Slave) in our datacenter running in vpn concentrator mode only and acting as a Hub for Spokes (MX67CWW). This is a working setup for years however on Monday 15th August MX450-A (Master) failed (showing unreachable on Meraki Dashboard) and MX450-B (slave) was showing as spare-ready failed to take over the primary role which caused a total outage for the entire customer estate. We have done all possible checks and there was no power outage or any issues with Uplink which stayed up during this time. To resolve this we went on to the dashboard and swapped primary and spare devices which worked then A became the slave and unable to join the cluster showing (out of date config). I called Meraki to force update the last known good config which fixed the issue. **Timeline** 15th Aug (9am-11am): A went down. No power outage. Uplink was up. B was showing as spare ready but never failed over to B. We manually forced B to become the new Master (swapped primary and spare devices option from the dashboard) and left it running all day 16th Aug (9am-10am): We tried to bring the uplink down for B to force the failover to A but it didn’t work. A wont become the new Master 17th Aug (9am-11am): We sent our field engineer to the DC and he pulled the UPLINK on B to force the failover to A but it didn’t work. A became the new Primary/Master for few minutes and showed as unreachable eventually. We tried this activity a few times and gave up and forced B to become the new Master and it stayed up like that since and both devices are now looking good since however we still dont know the answers to why this has happened and there is no resolution from Meraki support yet. We are still running on Hub-B and it can fail next time and we may get into same situation where Hub-A won’t take over or work properly and Dominos will experience an outage. Don’t forget we are still running on B and attempted to flip back to A but it failed badly as per my below email so appreciate if you can expedite progress on this case and we need a proper resolution and answers to our questions
... View more