Combining two physical Ethernet ports as part of one logical

Hi All,

This is regarding combining two physical eth ports into one logical
interface.

I have a linux system with 2 ethernet cards each having 2 eth ports.
PCI Card1 - eth0, eth1 - controlled by driver1
PCI Card2 - eth2, eth3 - controlled by driver2 (different klm)

I want to achieve ethernet port redundancy by treating 1 port of each
card as part of a logical interface.
e.g.
eth0, eth2 should be part of logical interface0
eth1, eth3 should be part of logical interface1

Ports in a logical interface shall be similar to ports in an ethernet
hub (e.g. seeing same traffic).
End objective is that even if one of the ports in a logical interface
goes down, communication to upper network stack layers is not
interrupted. e.g. if eth0 port cable is removed, all applications
shall continue to work since other port eth2 in the logical drive is
still up.
Each port in a logical interface should act as a hot standby for the
other port.

Note that network settings (e.g. IP addr, mask, gw) should be applied
to logical i/f rather than a physical port.

I am sure that linux supports this kind of port aggregation, but can't
find out exactly what is called and how to achieve this.

Please help if you have any pointers.

Thanks,
Manish