diff -uNrp anaconda-21.48.22.121.orig/pyanaconda/packaging/yumpayload.py anaconda-21.48.22.121/pyanaconda/packaging/yumpayload.py
--- anaconda-21.48.22.121.orig/pyanaconda/packaging/yumpayload.py	2017-08-23 02:04:02.304040176 +0000
+++ anaconda-21.48.22.121/pyanaconda/packaging/yumpayload.py	2017-08-23 02:12:02.749029047 +0000
@@ -518,12 +518,16 @@ reposdir=%s
     @property
     def mirrorEnabled(self):
         with _yum_lock:
-            # yum initializes with plugins disabled, and when plugins are disabled
-            # _yum.plugins is a DummyYumPlugins object, which has no useful attributes.
-            if hasattr(self._yum.plugins, "_plugins"):
-                return "fastestmirror" in self._yum.plugins._plugins
+            # we just skip this on CentOS since we cant support it yet
+            if productName.startswith("CentOS"):
+              return False
             else:
-                return False
+              # yum initializes with plugins disabled, and when plugins are disabled
+              # _yum.plugins is a DummyYumPlugins object, which has no useful attributes.
+              if hasattr(self._yum.plugins, "_plugins"):
+                  return "fastestmirror" in self._yum.plugins._plugins
+              else:
+                  return False
 
     def getRepo(self, repo_id):
         """Return the yum repo object."""