Running /etc/rc.d/network restart reads configuration files 3 times. This is not normally an issue, but is inefficent when the configuration files include some logic above simple variable definitions.

An easy way to fix this is to move the code to start and stop the network out of the switch statement and into individual functions, and then change this:

restart)
$0 stop
/bin/sleep 2
$0 start

so that it calls those functions instead of calling the entire script.