Explanation
Wire Mode is a VPN-1 NGX feature that enables VPN connections to successfully fail over, bypassing Security Gateway enforcement. This improves performance and reduces downtime. Based on a trusted source and destination, Wire Mode uses internal interfaces and VPN Communities to maintain a private and secure VPN session, without employing Stateful Inspection. Since Stateful Inspection no longer takes place, dynamicrouting protocols that do not survive state verification in non-Wire Mode configurations can now be deployed.
The VPN connection is no different from any other connections along a dedicated wire, thus the meaning of
"Wire Mode".