For bash 2.x, modify /etc/sysconfig/network-scripts/ifup-post as

--- /etc/sysconfig/network-scripts/ifup-post.ORIG       Tue Mar 10 23:23:02 1998
+++ /etc/sysconfig/network-scripts/ifup-post    Fri Apr 16 16:03:32 1999
@@ -20,7 +20,7 @@
 if [ "$ISALIAS" = no ] ; then
     allow_null_glob_expansion=foo
     for alias in /etc/sysconfig/network-scripts/ifcfg-${DEVICE}:* ; do
-       /etc/sysconfig/network-scripts/ifup $alias
+       [ -f $alias ] && /etc/sysconfig/network-scripts/ifup $alias
     done
     unset allow_null_glob_expansion
 fi