EDIT: This only applies to Redhat and Redhat clone distros. Not sure what quagga is.
EDIT: Never mind did a quick search on quagga. Not a bad suite of tools. May have to study them sometime.
You mean to setup eth0, eth1, eth2, and eth3. Then you can write what you need for them in /etc/sysconfig/network-scripts and each called ifcfg-eth0, ifcfg-eth1, and so on.
Example of mine.
DEVICE=eth0
BOOTPROTO=none
BROADCAST='tion: --broadcast'
# HWADDR=00:90:F5:0D:2F:85
IPADDR=192.168.230.78
NETMASK=255.255.255.0
NETWORK='option: --network'
ONBOOT=no
TYPE=Ethernet
GATEWAY=192.168.230.1
Also one can use the network gui tools to generate them as well.
Also if you install Webmin it has a good web based network config tool to add interfaces.
http://www.webmin.com
Brian