Upgrading the system to a newer version using zypper dup

Warning: this procedure only works on openSUSE 11.1+ 
 This procedure I have written is based on the official openSUSE wiki.
I have made it more compact and readable. 
 As root: 
 1. check that you have an update repo, that is is enabled, and update
the system using 
 #zypper up 
 2. disable all current repos using 
 #zypper mr --all --disable 
 3. add the new repos, for 11.3 the commands are: 
  zypper addrepo --name "openSUSE-11.3 OSS"  http://download.opensuse.org/distribution/11.3/repo/oss/  repo-11.3-oss 
  zypper addrepo --name "openSUSE-11.3 Non-OSS"  http://download.opensuse.org/distribution/11.3/repo/non-oss/  repo-11.3-non-oss 
  zypper addrepo --name "openSUSE-11.3 Updates"  http://download.opensuse.org/update/11.3/  repo-11.3-update 
 4. add 3rd party repos you had before, like packman, but be careful
not to add conflicting repos. Check they are the 11.3 version! 
 5. perform a repo refresh using: 
 # zypper ref -f 
 6. do the actual upgrade, by downloading all the packages first and
then installing (this is safer): 
 # zypper dup --download "in-advance" 
 
 
 
Be sure to check the 'packages to downgrade' and 'packages to remove'
part of the list.
 
 
 6a. I noticed, and this is not in the official wiki, that the last
commandline did not do the actual install, it did only the download. So
you have to run 
 # zypper dup  
 7. afterwards you can review all the repos (using # yast2
repositories) and remove the ones from the old version we disabled in
step 2. 
 8. add any repo you miss here and you're done!