I am adding a second data center for redundancy and a new pair of Meraki MX450's. Data Center 1 has two MX 450's and will be adding 2 new 450's to the new data center. The first ones run our wireless networks for 5 different campuses. The new MX450 will be available in the event we have an outage.   I have read the design guide but I'm not 100% certain of the following question and don't want to cause an outage so...   The current MX units are running in passthrough mode. So,   1. When adding the new MX's do I create an additional network in the same organization?    The current MX units are in combined network mode.   2. How do I specify what MX units to use, the new ones or the old ones how is that priority set?   3. Do the MX units in different data centers need a heartbeat to each other even though they are on different IP networks? 4. How do they talk to each other and not take over the traffic?   Thanks for any design help   ... View more