Network Problem

Hi everbody;
I have 2 p520 machines and created a vio server for each one (vio01 - vio02). I created 3 AIX 5.3 lpars on vio02 and 3 AIX 6.1 lpars on vio01. The problem is when 2 lpars are activated, i can ping gateway from both lpars and vio; but when i activate 3rd lpar, network downs and none of the lpars can ping the gateway. I have the same problem in vio02. I use only one physical network adapter and created shared ethernet adapter for lpars with same VLAN ID. Is there any limitations to use same shared ethernet? If yes how can i solve this problem? If not what can be the problem?

Login to each VIO server and run the following as padmin:

lsmap -all -net | tee netoutfile (perhaps call this netoutfile1 from VIO1 and 2 for VIO2)

Also run the command:

lsdev -virtual

Paste the results on here.

If possible can you copy and paste the LPAR I/O screens from the HMC as this will help identify which adapters are where.

i deleted the results because it can be confidential to state.
But ethernet adapters were available on both.