brconfig: bridge0: Operation not permitted

[Edy]

Hi

I am trying to execute the following command from CLI (as root user)
brconfig bridge0 add fxp0 add fxp1 stp fxp0 stp fxp1 hellotime 2 maxage 
20 fwdelay 15 up

but it says the following

brconfig: bridge0: Operation not permitted

After that I executed brconfig bridge0 and it shows that bridge is up??!!

shu:/root# brconfig bridge0
bridge0: flags=0<>
       priority 32768 hellotime 2 fwddelay 15 maxage 20 holdcnt 6 proto 
rstp
       designated: id 00:03:47:08:a3:66 priority 32768
       fxp1 flags=ab<LEARNING,DISCOVER,STP,AUTOEDGE,AUTOP2P>
               port 2 ifpriority 128 ifcost 200000 discarding role 
designated
       fxp0 flags=ab<LEARNING,DISCOVER,STP,AUTOEDGE,AUTOP2P>
               port 1 ifpriority 128 ifcost 200000 discarding role 
designated
       Addresses (max cache: 100, timeout: 240):

any idea?

Thanks,
edy