G430 / G450 IPsec

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Hi folks,
I'm trying to configure IPsec in a G430 Media Gateway referring this: Administering Avaya G430 Branch Gateway

The customer's IT department gave me an IPsec setup, all good except the IKEv2 and DH Group 14.

[ul]
[li]IKEv2 - I'm not sure if G4x0 MG supports that - no mention of IKE ver 2 in the docs and peer's [tt]initiate mode[/tt] offers just [tt]aggressive[/tt], [tt]main[/tt] and [tt]none[/tt][/li]
[li]setting DH Group 14 produces a warning: DH group 14 is computationally intensive and may degrade system performance in some cases ... anybody has experience running DH14?[/li]
[/ul]

Thanks for your input.