http://repo.zabbix.com/

# cat /etc/yum.repos.d/zabbix.repo 
[zabbix]
name=Zabbix Official Repository - $basearch
baseurl=http://repo.zabbix.com/zabbix/2.4/rhel/6/$basearch/
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-ZABBIX

[zabbix-non-supported]
name=Zabbix Official Repository non-supported - $basearch 
baseurl=http://repo.zabbix.com/non-supported/rhel/6/$basearch/
enabled=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-ZABBIX
gpgcheck=1