Build a network router on Linux
Zebra is enough to be a replacement of special Cisco routers http://www-900.ibm.com/developerworks/cn/linux/l-emu/index.shtml
By the way, a VMware article introduces a method of establishing a virtual network environment using Zebra.
VMware implements a computer in a computer http://www-900.ibm.com/developerWorks/cn/linux/l-vmware/index.shtml
