--- network.0	2009-10-13 13:05:40.924603683 -0500
+++ network	2009-10-13 13:18:59.534523717 -0500
@@ -172,6 +172,15 @@
 					/usr/sbin/brctl addif $br $brif || error=1
 				fi
 			done
+			eval brconfig="\$config_${br}"
+			if [ -n "${brconfig}" ]; then
+				if ${brconfig}; then
+					true
+				else
+					echo config_${br}=\"${brconfig}\" \<-- invalid configuration statement
+					error=1
+				fi
+			fi
 		fi
 	done
 }