@PhilipDAth I´d agree. But Sometimes when upgrading and rebooting the stack there is a STP trouble while the stack is booting and the firmware is not finished booting up and not finished creating the aggregat / etherchannel. ... View more

If you don't have inbound NAT, you could instead plug the two MXs into an ISP router.   My preference - get an MG21, and plug the Internet2 ports on the two MX into the MG21.  Then you have real HA.  🙂 ... View more