Quagga == Cisco-like CLI in Linux

Quagga Router
( https://www.quagga.net/ )

- Cisco-like interface + commands - that is Quagga Routing Software Suite
- all today-used routing protocols : BGP, OSPF, EIGRP, RIP and also IS-IS
- for routing uses the OS / Linux Kernel -- > no virtualization nor simulation
/ therefore its fast & speed together with lightness is essence...

 Kompletni manual v PDF: (download from U.S. NAVY .mil website )
 https://downloads.pf.itd.nrl.navy.mil/ospf-manet/archive/quagga-0.99.17mr2.0/quagga.pdf

Install Quagga on Debian, Ubuntu, Gentoo, Centos etc.
-- use the package manager or download latest updated package (production version 0.99)

Ubuntu direct install:
sudo apt install quagga*

Download latest - quagga-1.2.4.tar.gz:
wget http://download.savannah.gnu.org/releases/quagga/quagga-1.2.4.tar.gz /temp

Install & compile :
tar -xzvf /temp/quagga-1.2.4.tar.gz
cd /temp/quagga-1.2.4
cd install
./configure
make
make install

now enable the routing daemons you want to use:
 sudo nano /etc/quagga/daemons

Change as needed:
zebra=yes #<<<<<< has to be enabled for basic functionality
bgpd=yes
ospfd=yes
ospf6d=no
ripd=yes
ripngd=yes
isisd=no
babeld=no

Now you can copy the config samples to main dir:
cp /usr/share/doc/quagga/examples/*.* /etc/quagga/


Also edit the configuration file for VTYSH CLI to enable:
cd /etc/quagga
mv vtysh.conf.sample vtysh.conf

Last thing we need to enable IP Forwarding:
#echo "1" > /proc/sys/net/ipv4/ip_forward  

This adds the "1" value in /proc/sys/net/ipv4/ip_forward file and activates the IP forwarding

To keep the IP Forwarding "ON" after a Linux reboots edit the /etc/sysctl.conf file:
sudo nano /etc/sysctl.conf

press Ctrl + W and type:
forward
enter

and change value to 1
net.ipv4.ip_forward = 1

Or you can also use:

sudo su

echo "net.ipv4.ip_forward = 1" >> /etc/sysctl.conf 

 So,  are you ready? 
 Run the command vtysh instance: 

##  vtysh -C
##  vtysh


router> enable
router#
router# configure terminal
router(config)#
router(config)#end
router#write

You can start to use the Linux for routing!

In next article ::
explanation howto create BGP session between your home Cisco router /GNS3/ and your cloud VPS
Enjoy!