You could try LACP, but a staticly
defined trunk is probably easiest.
Example to use static trunking between
ports 1-3 on a Cisco to a Procurve...
interface GigabitEthernet1/1
channel-group 1
interface GigabitEthernet1/2
channel-group 1
interface GigabitEthernet1/3
channel-group 1
and on the Procurve
interface 1 no lacp
interface 2 no lacp
interface 3 no lacp
trunk 1-3 Trk1 Trunk