@harmankardon i would say about a year and half since we went with SD-WAN and MX67. so as you can imagine, management was not happy about this scenario since i pushed for Meraki. it could be a bad batch no clue, but the RMA went smooth and so was the replacement, no configuration change was made, the new MX will only need internet access through WAN1 to get the current config, you should be good to go after that. in my case i use 2 uplinks, and both are static, so i need to configure the new MX before deployment, but like I mentioned if you have your MX in DHCP, you should be able just to plug and play, the new MX will get the current config from the dashboard.
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