FW: Transparent 1Gig Ethernet over IP/Ethernet?

Hi all,

I need to transparently (especially LACP
frames) transport a gigabit Ethernet link with at least 1500 MTU over
either IP or Ethernet. Jumbo frames are enabled on
the transport backbone. While I need "full" (some encap overhead will be acceptable) GigE wire speed, encryption
is unnecessary.

Can anyone suggest a product -ideally some low-maintenance, high-reliability, perhaps ASIC-based hardware- that can do this?