I have a combined network that I need to split in order to upgrade an MX100 to and MX450. I need to clone the configuration of the MX 100. If I split the network while it is active will any configurations be lost? Will clients be disrupted?
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No. If you split the appliance network out of the combined network there's no impact.
If you're just doing an upgrade though I would remove the existing MX100 and then add the MX450 instead of messing around with two networks. You'll have to adjust the physical ports configs, and deal with cabling, but I think it's easier than trying to clone the network.
Why is the title of your post, "Client VPN split tunneling?"
I have split combined networks and combined them again and not seen any service interruption or other trouble. I did this most recently to get rid of an old demo MC network I had in one of my combined networks. If anything, you *might* lose historical data like client usage. If that is important, I would call support or research more to find out.
Ok back to the initial question. The reason I want to clone is because there are so many VLANs (cleaning this up later). So I am safe splitting and then re-combining.