[Yum] Installing from cache

[Igor Jagec]

# yum update -C
Setting up Update Process
Setting up repositories
Cannot find a valid baseurl for repo: updates-released
Error: Cannot find a valid baseurl for repo: updates-released
------------------------------------------------------------------------
 -C     Tells  yum  to  run  entirely  from cache - does not download or
        update any headers unless it has to  to  perform  the  requested
        action.
------------------------------------------------------------------------

It says that run Yum entirely from cache, but if I'm not connected
online it still tries to find some repos (?). Is it possible to
implement that feature which will not try to connect to the internet?
For instance, when I want to upgrade some computer using dial-up or no
net, that would be highly appreciated. Of course, presuming that I
copied all the files to hard disc. Thanks. Cheers!

-- 
Igor Jagec