[ECOS] STP doesn't work?

["wang cui" <iucgnaw at msn dot com>]

I designed birdge with 3 ethernet interfaces, enabled STB on every 
interface. Every interface send STP packets periodically.

But when I use the bridges to internetwoking, seems the STP doesn't prevent 
broadcast storm in loop connnection.

Network topology like below(no loop), it works well.

    H U B  Bridge0         Bridge1         Device
    | | X  eth0 eth1 eth2  eth0 eth1 eth2  ethx
    | |    |    |    X     X    |    |     |
PC---| |----|    |---------------|    |-----|

Network topology like below(Hub,Bridge0,Bridge1 generate a loop), it 
doesn't works.

    H U B  Bridge0         Bridge1         Device
    | | |  eth0 eth1 eth2  eth0 eth1 eth2  ethx
    | | |  |    |    X     |    |    |     |
PC---| |-|--|    |----------|----|    |-----|
        |------------------|
        
Packet keep being regenerated and going in the loop until I break the loop.

Any ideas?

Thanks in advanced.

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