NOTE: This is now core yum functionality, using the multilib_policy configuration option
this plugin makes Yum only install basearch packages on multiarch systems. If you type 'yum install foo' on a x68_64 system, only 'foo-x.y.x86_46.rpm' is installed. If you want to install the foo-x.y.i386.rpm, you have to type 'yum install foo.i386'. The plugin only works with 'yum install'.
How to install
Use the following command to install the basearchonly plugin
yum install yum-basearchonly