try changing the mac addresses of the ports so that they are different. i know 
this shouldnt matter if they are on different subnets but i've seen 'leakage' 
of mac addresses in some network hardware which can get thoroughly confused...

> le0 at ledma0 slot 4 offset 0x8c00000 level 6: address 08:00:20:7d:86:21
> le0: 8 receive buffers, 2 transmit buffers
> qec0 at sbus0 slot 0 offset 0x20000 level 4 (ipl 7): 128K memory
> qe0 at qec0 slot 0 offset 0x0 rev 1 address 08:00:20:7d:86:21
> qe1 at qec0 slot 1 offset 0x0 rev 1 address 08:00:20:7d:86:21
> qe2 at qec0 slot 2 offset 0x0 rev 1 address 08:00:20:7d:86:21
> qe3 at qec0 slot 3 offset 0x0 rev 1 address 08:00:20:7d:86:21