http://igi-01.pd.infn.it/mrepo/
, and CNAF, as secondary one on http://grid-it.cnaf.infn.it/mrepo/
repo
files: http://igi-01.pd.infn.it/mrepo/repos/#
# INFNGRID repositories
#
[ig_sl5_x86_64]
name = INFNGRID 3.2 x86_64
baseurl = http://igi-01.pd.infn.it/mrepo/ig_sl5-x86_64/RPMS.3_2_0/
http://grid-it.cnaf.infn.it/mrepo/ig_sl5-x86_64/RPMS.3_2_0/
enabled = 1
protect = 0
[ig_sl5_x86_64_externals]
name = INFNGRID 3.2 x86_64 (externals)
baseurl = http://igi-01.pd.infn.it/mrepo/ig_sl5-x86_64/RPMS.3_2_0_externals/
http://grid-it.cnaf.infn.it/mrepo/ig_sl5-x86_64/RPMS.3_2_0_externals/
enabled = 1
protect = 0
As we can see all these repo files are linked to two servers (baseurl) one mirror in Padova and the other in CNAF to have a backup server in case one of those is not working properly.
You can install the IGI release adding or updating your repository settings (both “Common repositories” and “Profile-specific repositories”) in /etc/yum.repos.d/ as described in IGI Installation and Configuration