Understanding OSPF External Route Path Selection

http://blog.ine.com/2011/04/04/understanding-ospf-external-route-path-selection/
http://habrahabr.ru/post/117099/
http://habrahabr.ru/post/117110/

http://blog.ipexpert.com/2010/08/11/quick-look-into-ospf-database-router-lsa/
http://blog.ipexpert.com/2010/09/13/quick-look-into-ospf-database-network-lsa/
http://blog.ipexpert.com/2010/09/15/quick-look-into-ospf-database-summary-lsa/
http://blog.ipexpert.com/2010/09/22/quick-look-into-ospf-database-external-and-asbr-summary-lsa/
http://blog.ipexpert.com/2010/09/27/quick-look-into-ospf-database-nssa-external-lsa/