As path to "ip" , "route" , etc. are not full paths this script can not work. Attaching a working version.
Created attachment 147307 [details] new network-bridge script with full paths.
The 'ip' and 'route' commands are both in /sbin. The initscripts are run at boottime with /sbin in $PATH, so there is no need to have full paths in the script. Did you perhaps try to start xend manually, after having become root without requesting a full login shell ie su root, insteda of su - root ? All the init scripts assume that you're running them from a root, login shell which will ensure $PATH always has /sbin in it.
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This seems like not a bug, and FC6 is now end-of-life. Closing.