remapping myrinet while jobs are running

Hello list,
I'm running gm-2.0.16_Linux on Linux version 2.4.20-28.7sm (RH7.3) on a 
24  node
cluster with dual athlon cpus on a Tyan board.
I understand that gm now remaps from the initialization script and  
"negotiates"
with the other nodes for the best network.  My question is  how can I 
set if a
node needs to be rebooted while a program is running on  other nodes, 
that the
remapping doesn't change the existing architecture?   I just what the 
node to
reboot and "plug" itself back into the network map  without recreating 
it, so
the the existing job doesn't loose it's  connectivity and have to be
restarted.

I think this must be simple but I haven't been able to determine how to 
do  it
from my reading of the documentation.  Can anyone point me in the right 
direction?

thanks,
-john