Quagga is a fork of Zebra.  Zebra is a new way of routing done in style.  Zebra works just like a Cisco router command-line interface and interoperates with all the devices on the internet.  It uses several protocols by attaching each one to an interface of the router.  The IP and IPv6 protocols that Zebra supports are BGP, OSPF, RIP, and the kernel routing table.  The main software tied each protocol together and will deliver routes to each style of protocol.  The preferred protocol order is BGP and OSPF because of their ability to maintain multiple routes, and then lastly, RIP.  (RIP is a single path routing protocol and works best where there is only one router link to the individual networks.)

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