Why does my system have a network interface called ibft0 ?

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Issue

Why does one of my systems have a network interface called ibft0 ?
The system logs contain an entry like the following:

udev: renamed network interface eth1 to ibft0

Environment

Red Hat Enterprise Linux (RHEL) 6.4
system on iSCSI
iBFT used to hand over IP/iSCSI target data to RHEL

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