This configuration takes four network interfaces and makes two bonds of two Interfaces. Also your network switch has to be able to support this configuration, HP Switches I use support this.
Edit /etc/modprobe.conf and add the following.
alias bond0 bonding
options bond0 mode=balance-alb miimon=100
alias bond1 bonding
options bond1 mode=balance-alb miimon=100
Edit /etc/sysconfig/network-scripts/ifcfg-bond0
DEVICE=bond0
IPADDR=192.168.0.2
NETWORK=192.168.0.0
NETMASK=255.255.255.0
USERCTL=no
BOOTPROTO=none
GATEWAY=192.168.0.1
ONBOOT=yes
IPV6INIT=no
Edit /etc/sysconfig/network-scripts/ifcfg-bond1
DEVICE=bond1
IPADDR=192.168.1.2
NETWORK=192.168.1.0
NETMASK=255.255.255.0
USERCTL=no
BOOTPROTO=none
GATEWAY=192.168.1.1
ONBOOT=yes
IPV6INIT=no
Edit /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
USERCTL=no
ONBOOT=yes
MASTER=bond0
SLAVE=yes
BOOTPROTO=none
Edit /etc/sysconfig/network-scripts/ifcfg-eth1
DEVICE=eth1
USERCTL=no
ONBOOT=yes
MASTER=bond0
SLAVE=yes
BOOTPROTO=none
Edit /etc/sysconfig/network-scripts/ifcfg-eth2
DEVICE=eth2
USERCTL=no
ONBOOT=yes
MASTER=bond1
SLAVE=yes
BOOTPROTO=none
Edit /etc/sysconfig/network-scripts/ifcfg-eth3
DEVICE=eth3
USERCTL=no
ONBOOT=yes
MASTER=bond1
SLAVE=yes
BOOTPROTO=none
Now restart the server.