cross connect

[HPlearning]

Hi All,

         I am new to the world of HP so please fogive the newb question. 

I have two procuvre 5412s on a legacy network that I need to cross connect to a parallel build environment (using FF5700s) with a aggregated ports for migrating servers. The problem is that both networks use VLAN 1 on diferent subnets. 

What I wanted to do was setup 2 1Gb untagged VLAN 1 aggregated ports on the procurve and connect them to 2 1Gb untagged ports on VL599 on the FF5700s then trunk the vlan to the servers that we are migrating to.

I set up the ports on the procurve in a trunk lacp and connected them to ports on the 5700 in a Bridge aggregation group (set to access port) thinking it would be isolated but it caused a spanning tree melt down. I tracked the issue down to be the fact that there are bridges set to pri 0 on both sides. This caught me by surprise and caused an outage for a few minutes.

Can anyone help me with a safe way do achieve this?