Link detection in Sun Happy Meal Ethernet

Hi,

I'm student of 5th High School in Cracow, Poland and also school's
network administrator. Last week our main rack catched fire visualizing
us our lack of redundancy.

We have spare Sun 220R server, which we are going to use as failover
router. Unfortunately, it is necessary for us to use EtherChannel,
bonding two pairs of interfaces at Sun Quattro HME.
After disconnecting one of two cables creating EtherChannel, driver
falls in infinite loop of "Link down, cable problem?", keeping interface
still up and running.

Is there any way to force putting it down in this case? I'm getting 50%
packet loss instead of link redundancy, because both of them are still
participating in traffic.

Jakub Kramarz