Help configuring ethernet bonding or using eth2?

I currently have 1 firewall, 1 Kemp Load Master 2000, 2 switches, and 5
servers. eth0 is being used for the connection between the firewall and
the load master is is configured for the 10.10.10.0/24 network. Eth1 is
configured for the 10.0.0.0/16 network and is currently hooked up to one
of the switches which connects all the servers that use the 10.0.0.0/16
network together. eth1 currently has the IP 10.0.0.1 and all of the
servers on the 10.0.0.0/16 network use this as their gateway.

I'd
like to be able to hook Eth2 up to the second switch and hook this up
to all the second NICs on the servers (This is supported on the servers
via NIC Teaming on windows server 2012 currently). I have tried to bond
eth1 and eth2 together using active-backup, but the bonded device
management screen says no ports available. What am I doing wrong? Also
could I just use eth2 as an extra connection like on a switch? Does it
matter if I give it the same IP as eth1 or can I just give it an IP on
the 10.0.0.0/16 netwok? Will this work with all the servers configured
to use 10.0.0.1 as the gateway? Let me know if this is clear as mud.