sudo apt-get install mininet
sudo git clone https://github.com/USC-NSL/miniNExT
cd miniNExT/
sudo apt-get install 'make deps'
sudo make install
cd ..
sudo apt-get install quagga quagga-doc
sudo python  miniNExT/examples/quagga-ixp/start.py 

** Creating Quagga network topology
** Starting the network
** Using Mininet Extended (MiniNExT) Handler
*** Creating network
*** Adding controller
*** Adding hosts:
a1 b1 c1 c2 d1 rs 
*** Adding switches:
fabric-sw1 
*** Adding links:
*** gave up after 3 retries