[SECURITY] Fedora 18 Update: quagga-0.99.21-6.fc18

Quagga is free software that operates TCP/IP-based routing protocols. It ta kes a multi-server and multi-threaded approach to resolving the current complex ity of the Internet. Quagga supports Babel, BGP4, BGP4+, BGP4-, IS-IS (experimental), OSPFv2, OSPFv3, RIPv1, RIPv2, and RIPng. 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.