/etc/network/interfaces
auto bond0
iface bond0 inet static
address 10.10.0.100
gateway 10.10.0.1
netmask 255.255.255.0
slaves eth0 eth1 eth2
bond-mode 802.3ad
bond-miimon 100
bond-lacp-rate 4
ExtremeWare configuration
As you may be able to guess, this configures ports 41, 42 and 43 for LACP
enable sharing 41 grouping 41,42,43 dynamic
This seems like quite an easy thing to do, thanks for the help.