Both modes use the same underlying AutoVPN tunnel. The only difference between these modes is VPN allows for split tunneling. The performance should be the same in either mode.
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Bear in mind that anything that's still using big old GBICs is pretty unlikely to still be supported in any way by Cisco. You can probably make it work but... security? supportability?
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Yes, you can do this from the dashboard UI easily under firmware if within so many days of the update, if past that just manually force the stable version firmware to the MX.
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