MX250 Firmware Update and Possible Network Loss

[rconiv]

This is mostly a sanity check.  We have dual MX250's for redundancy.  If I do the firmware update, it will do one after switching the network over to the other MX250, and then when it is done, switch back and do the other one, so we won't be down till it is done?  The manual says it does, but sometimes the manual is wrong, and this is something I can't have it be wrong on.

[DarrenOC · Accepted solution]

Hi @rconiv , you are correct. The Primary will upgrade first with traffic failing over to the secondary.  Then the secondary will have its firmware upgraded.

[DarrenOC]

Hi @rconiv 

these are the steps

1. The Primary MX downloads firmware

2. The Primary MX stops advertising VRRP

3. The Secondary MX becomes active

4. The Primary MX reboots

5. The Primary MX comes online again

6. The Primary MX starts advertising VRRP again

7. The Primary MX becomes active again

8. The Secondary MX downloads firmware (approximately 15 minutes after the original upgrade is scheduled)

9. The Secondary MX stops advertising VRRP

10. The Secondary MX reboots and comes back online

[rconiv]

Thank you, that is what I wanted to verify.

[DarrenOC]

You’re welcome. You’ve done your due diligence. 👍🏻

[PaulMcG]

It happens just as documentation says it will.  I had to monitor an upgrade once for a worried customer with a HA setup, and when I informed them it was done, they hadn't even noticed it took place.

https://documentation.meraki.com/Architectures_and_Best_Practices/Cisco_Meraki_Best_Practice_Design/...

[DarrenOC]

Hi @PaulMcG , you’re correct. It is amazingly seamless

[rconiv]

Thanks, it is for a 24 hour medical based call center, so I have to be a bit extra paranoid.