Quagga is free software that operates TCP/IP-based routing protocols. It takes a multi-server and multi-threaded approach to resolving the current complexity of the Internet. Quagga supports Babel, BGP4, BGP4+, BGP4-, IS-IS , OSPFv2, OSPFv3, RIPv1, RIPv2, RIPng, PIM-SSM and NHRP. Quagga is intended to be used as a Route Server and a Route Reflector. It is not a toolkit; it provides full routing power under a new architecture. Quagga by design has a process for each protocol. Quagga is a fork of GNU Zebra.