Comware

I have
(2) 2824's a 2810 and a 4000 switch.

I currently have them connected with 1 crossovercable from one to the next. I would like to add connections between the switches to increase speed.
What is this called? where can I find more info?And is it supported on the switches?
when we tried it the switches started blinking and we lost connectivity.

I beleive it is called Link Aggregation Protocol. I am reading that this is on by default. Do I need to specify what ports I am going to use?

hi
procurve switch two trunk method LACP and hp trunk

two port aggregate (may be four or eight port aggregate) increase speed

example
two switch LACP methot 2Gbps link connection
sw1(config)#trunk 49,50 trk1 lacp
sw2(config)#trunk 49,50 trk1 lacp

two switch trunk method 2Gbps link connection

sw1(config)#trunk 49,50 trk1 trunk
sw2(config)#trunk 49,50 trk1 trunk

good luck..